2021
|
Barbey, P., Grandprat, M., Faure, F. Cordierite-bearing orbicules record bulk assimilation and the pulsating nature of magma ascent : The Lafaye orbicular granite (France) (Article de journal) Dans: Journal of Petrology, p. 1–23, 2021. @article{Barbey_etal2021,
title = {Cordierite-bearing orbicules record bulk assimilation and the pulsating nature of magma ascent : The Lafaye orbicular granite (France)},
author = {P. Barbey and M. Grandprat and F. Faure},
doi = {10.1093/petrology/egab063},
year = {2021},
date = {2021-01-01},
journal = {Journal of Petrology},
pages = {1--23},
abstract = {The Lafaye orbicular body was emplaced in the Villatange tonalite-granodiorite unit of the Gu\'{e}ret magmatic complex (Massif Central, France). It consists of plagioclasic orbicules (4--35cm diameter) embedded in homogeneous cordierite granodiorite. Orbicule cores consist mostly of residual metasedimentary xenoliths or autolithic plagioclasic cumulates. Rims (0.7--8cm thickness) are single- or multi-layered ; layers, mostly comb-textured, comprise alternating sheets dominated by cordierite (XFetextonequarter0.32--0.37) or plagioclase (mostly An25--30). Additional mineral phases are minor biotite (XFetextonequarter0.52 ; AlVItextonequarter0.58--0.92 atoms per formula unit) and interstitial quartz. Plagioclase and cordierite morphologies (needle-like, skeletal, branching or fan-shaped) indicate growth under high initial supersaturation. However, the final polyhedral shapes and primary zoning of many individual plagioclase crystals, as well as evidence of partial recrystallization, imply significant textural maturation. Whole-rock major and trace element data (A/CNKtextonequarter1.12--1.46) and Sr and Nd isotopic compositions (eNd(355 Ma) =-8.6 to -7.4 ; 87Sr/86Sr(355 Ma) =0.7110--0.7147) suggest that the parental magma of the orbicules resulted from bulk assimilation of aluminous metasediments by a Villatange-type granodioritic magma. Heterogeneous nucleation and growth of plagioclase and cordierite around xenoliths/autoliths are interpreted in terms of (1) adiabatic decompression of magma pulses ascending in dykes leading to superheating and resorption of early solids, and (2) volatile exsolution, inducing undercooling, supersaturation, and rim crystallization. The variability of layers (number, thickness, mineral distribution, and texture) is considered to result from oscillatory crystallization combined with variable plagioclase growth rates linked to changes in the degree of supersaturation as a function of the extent of melt degassing, itself linked to magma transfer dynamics},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The Lafaye orbicular body was emplaced in the Villatange tonalite-granodiorite unit of the Guéret magmatic complex (Massif Central, France). It consists of plagioclasic orbicules (4--35cm diameter) embedded in homogeneous cordierite granodiorite. Orbicule cores consist mostly of residual metasedimentary xenoliths or autolithic plagioclasic cumulates. Rims (0.7--8cm thickness) are single- or multi-layered ; layers, mostly comb-textured, comprise alternating sheets dominated by cordierite (XFetextonequarter0.32--0.37) or plagioclase (mostly An25--30). Additional mineral phases are minor biotite (XFetextonequarter0.52 ; AlVItextonequarter0.58--0.92 atoms per formula unit) and interstitial quartz. Plagioclase and cordierite morphologies (needle-like, skeletal, branching or fan-shaped) indicate growth under high initial supersaturation. However, the final polyhedral shapes and primary zoning of many individual plagioclase crystals, as well as evidence of partial recrystallization, imply significant textural maturation. Whole-rock major and trace element data (A/CNKtextonequarter1.12--1.46) and Sr and Nd isotopic compositions (eNd(355 Ma) =-8.6 to -7.4 ; 87Sr/86Sr(355 Ma) =0.7110--0.7147) suggest that the parental magma of the orbicules resulted from bulk assimilation of aluminous metasediments by a Villatange-type granodioritic magma. Heterogeneous nucleation and growth of plagioclase and cordierite around xenoliths/autoliths are interpreted in terms of (1) adiabatic decompression of magma pulses ascending in dykes leading to superheating and resorption of early solids, and (2) volatile exsolution, inducing undercooling, supersaturation, and rim crystallization. The variability of layers (number, thickness, mineral distribution, and texture) is considered to result from oscillatory crystallization combined with variable plagioclase growth rates linked to changes in the degree of supersaturation as a function of the extent of melt degassing, itself linked to magma transfer dynamics |
2019
|
Baidada, B., Ikenne, M., Barbey, P., Soulaimani, A., Cousens, B., Haissen, F., Illmen, S., Anlasari, A. SHRIMP U--Pb zircon geochronology of the granitoids of the Imiter Inlier : Constraints on the Pan-African events in the Saghro massif, Anti-Atlas (Morocco) (Article de journal) Dans: Journal of African Earth Sciences, vol. 150, p. 799–810, 2019. @article{Baidada_etal2019,
title = {SHRIMP U--Pb zircon geochronology of the granitoids of the Imiter Inlier : Constraints on the Pan-African events in the Saghro massif, Anti-Atlas (Morocco)},
author = {B. Baidada and M. Ikenne and P. Barbey and A. Soulaimani and B. Cousens and F. Haissen and S. Illmen and A. Anlasari},
doi = {10.1016/j.jafrearsci.2018.10.008},
year = {2019},
date = {2019-01-01},
journal = {Journal of African Earth Sciences},
volume = {150},
pages = {799--810},
abstract = {https://doi.org/10.1016/j.jafrearsci.2018.10.008This study presents new U--Pb zircon ages for three granitoid bodies in the Imiter inlier at the eastern part of theMoroccan Anti-Atlas chain, which is located in the northwestern edge of the West African Craton (WAC).Analyzes of zircon grains yield the following ages : 538 textpm 6 and 575 textpm 10 Ma for the Igoudrane massif,567 textpm 6 Ma for the nearby Bou Teglimt granodiorite, and 582 textpm 6 Ma for the Bou Fliou granite. These newdata reveal that the Igoudrane massif is younger than previously thought (677 Ma), and that all the granitoids inthe Imiter area are Ediacaran in age and are related to the Ouarzazate Group. Sm-Nd isotopic data yield negative$epsilon$Nd(t) values (−4.5 to−0.2) and TDMmodel ages of 1.04--1.82 Ga. These data indicate the presence of aninherited Paleoproterozoic to Archaean component in some zircon grains and show that generation of the parentmagmas involved a Neoproterozoic juvenile contribution and recycling of an older crustal component.These new data allow reinterpreting the geochemical and isotopic data of the granitoids, and revisiting thestructural significance to the Igoudrane massif, which was assumed until now to be coeval with the major Pan-African event of the Central Anti-Atlas. They also bring significant constraints to discuss the context and age ofdeposition of the Saghro Group, which is still a matter of debate. All these data provide evidence of an em-placement of the Imiter granitoids in a subduction complex, which affected all of the Anti-Atlas chain during theLate Proterozoic time.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
https://doi.org/10.1016/j.jafrearsci.2018.10.008This study presents new U--Pb zircon ages for three granitoid bodies in the Imiter inlier at the eastern part of theMoroccan Anti-Atlas chain, which is located in the northwestern edge of the West African Craton (WAC).Analyzes of zircon grains yield the following ages : 538 textpm 6 and 575 textpm 10 Ma for the Igoudrane massif,567 textpm 6 Ma for the nearby Bou Teglimt granodiorite, and 582 textpm 6 Ma for the Bou Fliou granite. These newdata reveal that the Igoudrane massif is younger than previously thought (677 Ma), and that all the granitoids inthe Imiter area are Ediacaran in age and are related to the Ouarzazate Group. Sm-Nd isotopic data yield negative$epsilon$Nd(t) values (−4.5 to−0.2) and TDMmodel ages of 1.04--1.82 Ga. These data indicate the presence of aninherited Paleoproterozoic to Archaean component in some zircon grains and show that generation of the parentmagmas involved a Neoproterozoic juvenile contribution and recycling of an older crustal component.These new data allow reinterpreting the geochemical and isotopic data of the granitoids, and revisiting thestructural significance to the Igoudrane massif, which was assumed until now to be coeval with the major Pan-African event of the Central Anti-Atlas. They also bring significant constraints to discuss the context and age ofdeposition of the Saghro Group, which is still a matter of debate. All these data provide evidence of an em-placement of the Imiter granitoids in a subduction complex, which affected all of the Anti-Atlas chain during theLate Proterozoic time. |
Barbey, P., Faure, F., Paquette, J. L., Pistre, K., Delangle, C., Gremilliet, J. P. Skeletal quartz and dendritic biotite: Witnesses of primary disequilibrium growth textures in an alkali-feldspar granite (Article de journal) Dans: Lithos, vol. 348-349, p. 105202, 2019. @article{Barbey_etal2019,
title = {Skeletal quartz and dendritic biotite: Witnesses of primary disequilibrium growth textures in an alkali-feldspar granite},
author = {P. Barbey and F. Faure and J. L. Paquette and K. Pistre and C. Delangle and J. P. Gremilliet},
doi = {10.1016/j.lithos.2019.105202},
year = {2019},
date = {2019-01-01},
journal = {Lithos},
volume = {348-349},
pages = {105202},
abstract = {We describe a case of S-type alkali-feldspar granite (quartz/K-feldspar/plagioclase/ biotite/garnet �`u 30/35/20/13/2 vol%) showing skeletal and dendritic textures. It consists of three nested units distinguishable by the size of biotite crystals: a first-emplaced unit characterized by small biotite flakes (0.4--9 mm); a second unit with cm-sized biotite platelets (0.3--28 mm) outlining a syn-magmatic foliation; and a third unit formed of large biotite plates (0.7--850 mm) showing dendritic and radial growth patterns.Quartz occurs mostly as rounded to euhedral grains, but also shows complex shapes (serrated outline, re-entrants, etc.). Cathodoluminescence imaging reveals that grains consist of both rounded and skeletal bluish cores (quartz-1) rimmed by reddish overgrowths (quartz-2) that lead locally to the coalescence of neighbouring grains and equilibrated texture. Biotite is poikilitic enclosing dominantly quartz grains but also in lesser amount plagioclase and garnet. In the third unit, biotite shows textures typical of dendritic growth (bifurcating, radiating or branching structures, skeletal core). Plagioclase (An≤25) occurs as small euhedral to subhedral grains scattered in the matrix or forming glomerophyric aggregates. K-feldspar (Or74--100) mostly forms an almost equilibrated mosaic of anhedral perthitic crystals; it also appears in association with albite as a secondary phase replacing plagioclase. The crystallization sequence started with garnet, then proceeded with quartz, plagioclase, biotite and K-feldspar, ended with cordierite, and was followed by subsolidus reequilibration.The variability in size and morphology of quartz and biotite is interpreted in terms of variable undercooling depending on temperature of the host-rocks and on more or less intense degassing of magma batches with variable melt water content. Here, rapid crystallization prevented significant textural reequilibration and allowed the initial crystallization textures of quartz to be preserved. Overall, this study shows that behind the common textquotelefttextquoteleftcoarse-grainedtextquoterighttextquoteright texture of quartz in granite, subsist primary disequilibrium crystallization textures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We describe a case of S-type alkali-feldspar granite (quartz/K-feldspar/plagioclase/ biotite/garnet �`u 30/35/20/13/2 vol%) showing skeletal and dendritic textures. It consists of three nested units distinguishable by the size of biotite crystals: a first-emplaced unit characterized by small biotite flakes (0.4--9 mm); a second unit with cm-sized biotite platelets (0.3--28 mm) outlining a syn-magmatic foliation; and a third unit formed of large biotite plates (0.7--850 mm) showing dendritic and radial growth patterns.Quartz occurs mostly as rounded to euhedral grains, but also shows complex shapes (serrated outline, re-entrants, etc.). Cathodoluminescence imaging reveals that grains consist of both rounded and skeletal bluish cores (quartz-1) rimmed by reddish overgrowths (quartz-2) that lead locally to the coalescence of neighbouring grains and equilibrated texture. Biotite is poikilitic enclosing dominantly quartz grains but also in lesser amount plagioclase and garnet. In the third unit, biotite shows textures typical of dendritic growth (bifurcating, radiating or branching structures, skeletal core). Plagioclase (An≤25) occurs as small euhedral to subhedral grains scattered in the matrix or forming glomerophyric aggregates. K-feldspar (Or74--100) mostly forms an almost equilibrated mosaic of anhedral perthitic crystals; it also appears in association with albite as a secondary phase replacing plagioclase. The crystallization sequence started with garnet, then proceeded with quartz, plagioclase, biotite and K-feldspar, ended with cordierite, and was followed by subsolidus reequilibration.The variability in size and morphology of quartz and biotite is interpreted in terms of variable undercooling depending on temperature of the host-rocks and on more or less intense degassing of magma batches with variable melt water content. Here, rapid crystallization prevented significant textural reequilibration and allowed the initial crystallization textures of quartz to be preserved. Overall, this study shows that behind the common textquotelefttextquoteleftcoarse-grainedtextquoterighttextquoteright texture of quartz in granite, subsist primary disequilibrium crystallization textures. |
Saha-Fouotsa, A. N., Vanderhaeghe, O., Barbey, P., Eglinger, A., Tchameni, R., Zeh, A., Tchunte, P. F., Nomo, E. N. The geologic record of the exhumed root of the Central African Orogenic Belt in the central Cameroon domain (Mbé -- Sassa-Mbersi region) (Article de journal) Dans: Journal of African Earth Sciences, vol. 151, no. 3, p. 286–314, 2019. @article{Saha-Fouotsa_etal2019,
title = {The geologic record of the exhumed root of the Central African Orogenic Belt in the central Cameroon domain (Mb\'{e} -- Sassa-Mbersi region)},
author = {A. N. Saha-Fouotsa and O. Vanderhaeghe and P. Barbey and A. Eglinger and R. Tchameni and A. Zeh and P. F. Tchunte and E. N. Nomo},
doi = {10.1016/j.jafrearsci.2018.12.008},
year = {2019},
date = {2019-01-01},
journal = {Journal of African Earth Sciences},
volume = {151},
number = {3},
pages = {286--314},
abstract = {We present structural, petrological, geochemical and geochronological data compiled in a new geological map on the high-grade metamorphic rocks exposed in the Mb\'{e} -- Sassa-Mbersi region located along the Tchollir\'{e}-Banyo Shear Zone, at the northern edge of the Central Cameroon domain.The region exposes a complex assemblage of metabasic (hornblendite, metagabbro, amphibolite) and metasedimentary (garnet paragneiss, calc-silicate gneiss) rocks alternating with ubiquitous migmatitic intermediate to felsic gneisses. U-Pb ages on detrital zircon in paragneiss point to the contribution of Archean, Paleoproterozoic and Neoproterozoic sources, and suggest a maximum deposition age of 725 textpm 12 Ma for their sedimentary protolith. The protolith of some amphibolites was emplaced during the Neoproterozoic as indicated by U--Pb ages on magmatic zircon at 600 textpm 4 and 599 textpm 6 Ma. Plutonic rocks with I-type chemical signatures were emplaced discontinuously over a period of ca. 80 Ma. The magmatic evolution started with the intrusion of magnesian medium-K tonalites and trondhjemites at 651 textpm 3 Ma, followed by magnesian high-K hornblende-biotite granites and ferroan shoshonitic biotite granites until 599 textpm 2 Ma. Finally, pegmatite dykes were emplaced along dextral shear zones at 573 textpm 2 Ma. The metamorphic rocks show a penetrative shallow-dipping foliation partially to totally transposed in a NE--SW trending steep-dipping foliation bearing a shallow-dipping lineation. These ductile syn-migmatitic fabrics, developed under high-grade metamorphic conditions in the presence of melt, between the metamorphic peak at ca. 1.3 GPa--770 textdegreeC, and the following isothermal decompression down to ca. 0.8 GPa. In situ U--Pb dating of metamorphic zircon rims from a garnet migmatitic paragneiss yields an age of 582 textpm 4 Ma. Localization of high-grade deformation is indicated by the development of the Tchollir\'{e}-Banyo Shear Zone, characterized by mutually crosscutting subvertical and shallow-dipping mylonitic to ultramylonitic shear zones associated with sinistral and top-to-the SW kinematic criteria, respectively. These data indicate that the Central Cameroon domain exposed in the Mb\'{e} -- Sassa-Mbersi region, represents the exhumed mid-to lower part of the former orogenic root of the Pan-African Central Africa Orogenic Belt that has undergone partial melting, lateral flow and intrusion of mafic to felsic calc-alkaline magmas between 650 and 580 Ma. The waning stage of the Pan-African orogeny is marked by the emplacement of syntectonic pegmatitic granite at ca. 575 Ma in subvertical E-W trending retrogressive dextral shear zones.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We present structural, petrological, geochemical and geochronological data compiled in a new geological map on the high-grade metamorphic rocks exposed in the Mbé -- Sassa-Mbersi region located along the Tcholliré-Banyo Shear Zone, at the northern edge of the Central Cameroon domain.The region exposes a complex assemblage of metabasic (hornblendite, metagabbro, amphibolite) and metasedimentary (garnet paragneiss, calc-silicate gneiss) rocks alternating with ubiquitous migmatitic intermediate to felsic gneisses. U-Pb ages on detrital zircon in paragneiss point to the contribution of Archean, Paleoproterozoic and Neoproterozoic sources, and suggest a maximum deposition age of 725 textpm 12 Ma for their sedimentary protolith. The protolith of some amphibolites was emplaced during the Neoproterozoic as indicated by U--Pb ages on magmatic zircon at 600 textpm 4 and 599 textpm 6 Ma. Plutonic rocks with I-type chemical signatures were emplaced discontinuously over a period of ca. 80 Ma. The magmatic evolution started with the intrusion of magnesian medium-K tonalites and trondhjemites at 651 textpm 3 Ma, followed by magnesian high-K hornblende-biotite granites and ferroan shoshonitic biotite granites until 599 textpm 2 Ma. Finally, pegmatite dykes were emplaced along dextral shear zones at 573 textpm 2 Ma. The metamorphic rocks show a penetrative shallow-dipping foliation partially to totally transposed in a NE--SW trending steep-dipping foliation bearing a shallow-dipping lineation. These ductile syn-migmatitic fabrics, developed under high-grade metamorphic conditions in the presence of melt, between the metamorphic peak at ca. 1.3 GPa--770 textdegreeC, and the following isothermal decompression down to ca. 0.8 GPa. In situ U--Pb dating of metamorphic zircon rims from a garnet migmatitic paragneiss yields an age of 582 textpm 4 Ma. Localization of high-grade deformation is indicated by the development of the Tcholliré-Banyo Shear Zone, characterized by mutually crosscutting subvertical and shallow-dipping mylonitic to ultramylonitic shear zones associated with sinistral and top-to-the SW kinematic criteria, respectively. These data indicate that the Central Cameroon domain exposed in the Mbé -- Sassa-Mbersi region, represents the exhumed mid-to lower part of the former orogenic root of the Pan-African Central Africa Orogenic Belt that has undergone partial melting, lateral flow and intrusion of mafic to felsic calc-alkaline magmas between 650 and 580 Ma. The waning stage of the Pan-African orogeny is marked by the emplacement of syntectonic pegmatitic granite at ca. 575 Ma in subvertical E-W trending retrogressive dextral shear zones. |
2018
|
Barbey, P., Denele, Y., Paquette, J. L., Berger, J., Ganne, J., Roques, D. The Marbat metamorphic core-complex (Southern Arabian Peninsula): Reassessment of the evolution of a Neoproterozoic island-arc from petrological, geochemical and U-Pb zircon data (Article de journal) Dans: Precambrian Research, vol. 305, p. 91–110, 2018. @article{Barbey_etal2018,
title = {The Marbat metamorphic core-complex (Southern Arabian Peninsula): Reassessment of the evolution of a Neoproterozoic island-arc from petrological, geochemical and U-Pb zircon data},
author = {P. Barbey and Y. Denele and J. L. Paquette and J. Berger and J. Ganne and D. Roques},
doi = {10.1016/j.precamres.2017.12.013},
year = {2018},
date = {2018-01-01},
journal = {Precambrian Research},
volume = {305},
pages = {91--110},
abstract = {The Marbat basement (Sultanate of Oman) belongs to the Neoproterozoic accretion domain of the Arabian-Nubian shield. We present new geochronological, petrological and geochemical data as an extension of our previous study (Den`ele et al., 2017) re-interpreting this basement as a metamorphic core complex (MCC). We showed that this MCC consists of a metamorphic unit (Juffa complex) separated by an extensional detachment from a plutonic unit (Sadh complex and Tonalite plutons). Geochemical data show that the Juffa metasediments correspond to volcanogenic graywackes, suggesting deposition in front of a juvenile magmatic arc. New in situ U--Pb zircon data show that the protolith of the Juffa paragneisses is Tonian in age (960--830 Ma). The Juffa complex recrystallized under amphibolite facies conditions (950 MPa, 630 textdegreeC) corresponding to thermal gradient of 17--18 textdegreeC/km, i.e. close to that observed in fore-arc environment subjected to tectonic underplating. It was then retrogressed (\<400 MPa, \<400 textdegreeC) during exhumation of the MCC.Phase assemblages of the Sadh complex and Tonalite plutons record magmatic temperatures estimated at 700--840 textdegreeC and 610--840 textdegreeC from hornblende and zircon-saturation thermometry, respectively; pressures are grossly estimated at ca. 250 MPa. These data and structural evidence led us to consider that the Sadh complex is a plutonic unit emplaced during exhumation of the MCC. Hence, we re-interpret the previously published zircon core U--Pb ages of the Banded gneisses (ca. 860--830 Ma) as inherited, and zircon rim ages (ca. 815 Ma) as the age of their intrusion. This suggests that the parent magma of all these granitoids could have interacted with volcanic material equivalent to the Juffa complex.Overall, the Marbat area developed during the Tonian and involved (i) deposition of volcanosediments (Juffa complex) in an island-arc environment (960--830 Ma); (ii) metamorphism under middle pressure conditions during tectonic underplating at ca. 820--815 Ma, followed by emplacement of plutonic rocks in the upper crust during initiation of the MCC at ca. 815--810 Ma; and (iii) late-tectonic intrusions associated with MCC amplification at ca. 800--790 Ma (Mahall intrusives and Tonalite plutons).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The Marbat basement (Sultanate of Oman) belongs to the Neoproterozoic accretion domain of the Arabian-Nubian shield. We present new geochronological, petrological and geochemical data as an extension of our previous study (Den`ele et al., 2017) re-interpreting this basement as a metamorphic core complex (MCC). We showed that this MCC consists of a metamorphic unit (Juffa complex) separated by an extensional detachment from a plutonic unit (Sadh complex and Tonalite plutons). Geochemical data show that the Juffa metasediments correspond to volcanogenic graywackes, suggesting deposition in front of a juvenile magmatic arc. New in situ U--Pb zircon data show that the protolith of the Juffa paragneisses is Tonian in age (960--830 Ma). The Juffa complex recrystallized under amphibolite facies conditions (950 MPa, 630 textdegreeC) corresponding to thermal gradient of 17--18 textdegreeC/km, i.e. close to that observed in fore-arc environment subjected to tectonic underplating. It was then retrogressed (<400 MPa, <400 textdegreeC) during exhumation of the MCC.Phase assemblages of the Sadh complex and Tonalite plutons record magmatic temperatures estimated at 700--840 textdegreeC and 610--840 textdegreeC from hornblende and zircon-saturation thermometry, respectively; pressures are grossly estimated at ca. 250 MPa. These data and structural evidence led us to consider that the Sadh complex is a plutonic unit emplaced during exhumation of the MCC. Hence, we re-interpret the previously published zircon core U--Pb ages of the Banded gneisses (ca. 860--830 Ma) as inherited, and zircon rim ages (ca. 815 Ma) as the age of their intrusion. This suggests that the parent magma of all these granitoids could have interacted with volcanic material equivalent to the Juffa complex.Overall, the Marbat area developed during the Tonian and involved (i) deposition of volcanosediments (Juffa complex) in an island-arc environment (960--830 Ma); (ii) metamorphism under middle pressure conditions during tectonic underplating at ca. 820--815 Ma, followed by emplacement of plutonic rocks in the upper crust during initiation of the MCC at ca. 815--810 Ma; and (iii) late-tectonic intrusions associated with MCC amplification at ca. 800--790 Ma (Mahall intrusives and Tonalite plutons). |
Kornprost, J., Abalos, B., Barbey, P., Boullier, A. M., Burg, J. P., Capdevila, R., Claesson, S., Cordani, U., Corrigan, D., Gabrielsen, R. H., Gil-Ibarguchi, J. I., Johansson, A., Letsch, D., Vigouroux, P. Le, Upton, B. Boris Choubert: Unrecognized visionary geologist, pioneer of the global tectonics (Article de journal) Dans: Bulletin de la Société géologique de France, vol. 189, no. 7, 2018. @article{Kornprost_etal2018,
title = {Boris Choubert: Unrecognized visionary geologist, pioneer of the global tectonics},
author = {J. Kornprost and B. Abalos and P. Barbey and A. M. Boullier and J. P. Burg and R. Capdevila and S. Claesson and U. Cordani and D. Corrigan and R. H. Gabrielsen and J. I. Gil-Ibarguchi and A. Johansson and D. Letsch and P. Le Vigouroux and B. Upton},
doi = {10.1051/bsgf/2018006},
year = {2018},
date = {2018-01-01},
journal = {Bulletin de la Soci\'{e}t\'{e} g\'{e}ologique de France},
volume = {189},
number = {7},
abstract = {This work is a review of Boris Chouberttextquoterights paper (1935), which was published in French under the rather devalorizing title: textquotelefttextquoteleftResearch on the Genesis of Palaeozoic and Precambrian Belts.textquoterighttextquoteright Despite its innovative content, this article had no impact either at the time of its publication or even later. It begins with the construction of a remarkable fit of the circum-Atlantic continents. This was based on the −1.000thinspacemeters isobath instead of the shoreline. Thirty years before Bullard et al. (1965), it demonstrated in an indisputable way the reality of the continents motion on the surface of the Earth. Therefore, Choubert designated Wegenertextquoterights textquotelefttextquoteleftcontinental drifttextquoterighttextquoteright as the main cause of tectonics. Even going beyond Wegenertextquoterights theory, he argued that this mechanism was efficient well before the formation of the Triassic Pang\aea, during the whole Palaeozoic to result in the building of the Caledonian and Hercynian mountains. Although he was still encumbered by the vocabulary of the time regarding geosynclines, Boris Choubert described tectonics based on the horizontal mobility of the Precambrian continental blocks. Oddly enough, he did not apply this model to the Precambrian structures, which he attributed to the effects of the Earthtextquoterights rotation on the continental crust during its solidification. At the time of its publication, this paper was a very important step towards understanding global tectonics. Unfortunately, Chouberttextquoterights contemporaries did not generally recognize its significance.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This work is a review of Boris Chouberttextquoterights paper (1935), which was published in French under the rather devalorizing title: textquotelefttextquoteleftResearch on the Genesis of Palaeozoic and Precambrian Belts.textquoterighttextquoteright Despite its innovative content, this article had no impact either at the time of its publication or even later. It begins with the construction of a remarkable fit of the circum-Atlantic continents. This was based on the −1.000thinspacemeters isobath instead of the shoreline. Thirty years before Bullard et al. (1965), it demonstrated in an indisputable way the reality of the continents motion on the surface of the Earth. Therefore, Choubert designated Wegenertextquoterights textquotelefttextquoteleftcontinental drifttextquoterighttextquoteright as the main cause of tectonics. Even going beyond Wegenertextquoterights theory, he argued that this mechanism was efficient well before the formation of the Triassic Pangæa, during the whole Palaeozoic to result in the building of the Caledonian and Hercynian mountains. Although he was still encumbered by the vocabulary of the time regarding geosynclines, Boris Choubert described tectonics based on the horizontal mobility of the Precambrian continental blocks. Oddly enough, he did not apply this model to the Precambrian structures, which he attributed to the effects of the Earthtextquoterights rotation on the continental crust during its solidification. At the time of its publication, this paper was a very important step towards understanding global tectonics. Unfortunately, Chouberttextquoterights contemporaries did not generally recognize its significance. |
Tchakounte, J., Eglinger, A., Toteu, S. F., Zeh, A., Nkoumbou, C., Mvondo-Ondoa, J., Penaye, J., Wit, M., Barbey, P. Reply to comment by M. Bouyo on textquotelefttextquoteleftThe Adamawa--Yade domain, a piece of Archaean crust in the Neoproterozoic Central African Orogenic belt (Bafia area, Cameroon)textquoterighttextquoteright, by Jacqueline Tchakounté et al. (Article de journal) Dans: Precambrian Research, vol. 305, p. 514–515, 2018. @article{Tchakounte_etal2018,
title = {Reply to comment by M. Bouyo on textquotelefttextquoteleftThe Adamawa--Yade domain, a piece of Archaean crust in the Neoproterozoic Central African Orogenic belt (Bafia area, Cameroon)textquoterighttextquoteright, by Jacqueline Tchakount\'{e} et al.},
author = {J. Tchakounte and A. Eglinger and S. F. Toteu and A. Zeh and C. Nkoumbou and J. Mvondo-Ondoa and J. Penaye and M. Wit and P. Barbey},
doi = {10.1016/j.precamres.2017.12.003},
year = {2018},
date = {2018-01-01},
journal = {Precambrian Research},
volume = {305},
pages = {514--515},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Tchakounte, J., Eglinger, A., Toteu, S. F., Zeh, A., Nkoumbou, C., Mvondo-Ondoa, J., Penaye, J., Wit, M., Barbey, P. Reply to comment by Ngako and Njonfang on textquotelefttextquoteleftThe Adamawa-Yade domain, a piece of Archaean crust in the Neoproterozoic Central African Orogenic belt (Bafia area, Cameroon)textquoterighttextquoteright, by Jacqueline Tchakounté et al. (Article de journal) Dans: Precambrian Research, vol. 305, p. 516–518, 2018. @article{Tchakounte_etal2018_2,
title = {Reply to comment by Ngako and Njonfang on textquotelefttextquoteleftThe Adamawa-Yade domain, a piece of Archaean crust in the Neoproterozoic Central African Orogenic belt (Bafia area, Cameroon)textquoterighttextquoteright, by Jacqueline Tchakount\'{e} et al.},
author = {J. Tchakounte and A. Eglinger and S. F. Toteu and A. Zeh and C. Nkoumbou and J. Mvondo-Ondoa and J. Penaye and M. Wit and P. Barbey},
doi = {10.1016/j.precamres.2017.12.035},
year = {2018},
date = {2018-01-01},
journal = {Precambrian Research},
volume = {305},
pages = {516--518},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2017
|
Baidada, B., Cousens, B., Alansari, A., Soulaimani, A., Barbey, P., Ilmen, S., Ikenne, M. Geochemistry and Sm--Nd isotopic composition of the Imiter Pan-African granitoids (Saghro massif, eastern Anti-Atlas, Morocco): Geotectonic implications (Article de journal) Dans: Journal of African Earth Sciences, vol. 127, p. 99–112, 2017. @article{Baidada_etal2017,
title = {Geochemistry and Sm--Nd isotopic composition of the Imiter Pan-African granitoids (Saghro massif, eastern Anti-Atlas, Morocco): Geotectonic implications},
author = {B. Baidada and B. Cousens and A. Alansari and A. Soulaimani and P. Barbey and S. Ilmen and M. Ikenne},
doi = {10.1016/j.jafrearsci.2016.08.016},
year = {2017},
date = {2017-01-01},
journal = {Journal of African Earth Sciences},
volume = {127},
pages = {99--112},
abstract = {The Imiter inlier (eastern part of the Moroccan Anti-Atlas) is located on the northwestern border of the West African Craton (WAC) and exhibits a range of Pan-African granitoids. Three massifs that crosscut the Imiter Saghro Group were targeted in this work: the Igoudrane granodiorite, Bou Teglimt granodiorite and Bou Fliou granite. We present here additional geochemical analyses (major and trace elements) and Sm-Nd isotopic data, which define two distinct groups: (i) the Igoudrane massif (677 Ma) and (ii) the Bou Teglimt granodiorite (576 Ma) and the Bou Fliou granite (550 Ma).Geochemical data confirm the calc-alkaline signature of the studied granitoids. Both groups of granitoids are slightly peraluminous and show strong negative anomalies in Nb, Ta and Ti in multi-element plots normalized to the primitive mantle. The granitoids have low 143Nd/144Nd initial ratios (0.5116--0.5117), with TDM model ages ranging from 1.73 to 1.52Ga. The $epsilon$Nd(t) values are negative, decreasing from the Igoudrane samples (−1.1 to −3.1) to the Bou Teglimt granodiorite (−3.0 to −3.3) and Bou Fliou (−4.2 to −4.8). All these data suggest a mixed magmatic origin involving a juvenile mantle source and an old, at least Paleoproterozoic crust. Given Mesoproterozoic rocks are lacking or very scarce in the Anti-Atlas, these results confirm the existence of an old cratonic basement beneath the eastern Anti-Atlas, and therefore suggest that the northern border of the West African Craton must be placed further to the north, as suggested by previous work in this region.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The Imiter inlier (eastern part of the Moroccan Anti-Atlas) is located on the northwestern border of the West African Craton (WAC) and exhibits a range of Pan-African granitoids. Three massifs that crosscut the Imiter Saghro Group were targeted in this work: the Igoudrane granodiorite, Bou Teglimt granodiorite and Bou Fliou granite. We present here additional geochemical analyses (major and trace elements) and Sm-Nd isotopic data, which define two distinct groups: (i) the Igoudrane massif (677 Ma) and (ii) the Bou Teglimt granodiorite (576 Ma) and the Bou Fliou granite (550 Ma).Geochemical data confirm the calc-alkaline signature of the studied granitoids. Both groups of granitoids are slightly peraluminous and show strong negative anomalies in Nb, Ta and Ti in multi-element plots normalized to the primitive mantle. The granitoids have low 143Nd/144Nd initial ratios (0.5116--0.5117), with TDM model ages ranging from 1.73 to 1.52Ga. The $epsilon$Nd(t) values are negative, decreasing from the Igoudrane samples (−1.1 to −3.1) to the Bou Teglimt granodiorite (−3.0 to −3.3) and Bou Fliou (−4.2 to −4.8). All these data suggest a mixed magmatic origin involving a juvenile mantle source and an old, at least Paleoproterozoic crust. Given Mesoproterozoic rocks are lacking or very scarce in the Anti-Atlas, these results confirm the existence of an old cratonic basement beneath the eastern Anti-Atlas, and therefore suggest that the northern border of the West African Craton must be placed further to the north, as suggested by previous work in this region. |
Denele, Y., Roques, D., Ganne, J., Chardon, D., Rousse, S., Barbey, P. Strike-slip metamorphic core complexes: Gneiss domes emplaced in releasing bends (Article de journal) Dans: Geology, vol. 45, p. 903–906, 2017. @article{Denele_etal2017,
title = {Strike-slip metamorphic core complexes: Gneiss domes emplaced in releasing bends},
author = {Y. Denele and D. Roques and J. Ganne and D. Chardon and S. Rousse and P. Barbey},
doi = {10.1130/G39065.1},
year = {2017},
date = {2017-01-01},
journal = {Geology},
volume = {45},
pages = {903--906},
abstract = {We investigate the development of a Neoproterozoic metamorphic core complex (MCC) in the Marbat area (southern Arabian Peninsula). The MCC is a gneiss dome emplaced in a releasing bend along a dextral strike-slip fault system. Dome emplacement--related extension was at a high angle to the long axis of the dome and 65textdegree from the strike-slip fault system. Shortening is recorded in the upper plate of the MCC in a direction normal to the extension direction. Extensional emplacement of the gneiss dome accommodated lower crust exhumation and contributed to the formation of a ductile strike-slip releasing bend from an initial fault step. The Marbat example allows defining transversal stretching--dominated strike-slip MCCs, which would represent the early development stages of longitudinal stretching--dominated strike-slip MCCs. Conversely, longitudinal stretching--dominated strike-slip MCCs produced at low finite extension would result from strike-slip--dominated transtension. This study bears important implications for lower crust exhumation under pull-apart basin systems in obliquely convergent or divergent settings.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We investigate the development of a Neoproterozoic metamorphic core complex (MCC) in the Marbat area (southern Arabian Peninsula). The MCC is a gneiss dome emplaced in a releasing bend along a dextral strike-slip fault system. Dome emplacement--related extension was at a high angle to the long axis of the dome and 65textdegree from the strike-slip fault system. Shortening is recorded in the upper plate of the MCC in a direction normal to the extension direction. Extensional emplacement of the gneiss dome accommodated lower crust exhumation and contributed to the formation of a ductile strike-slip releasing bend from an initial fault step. The Marbat example allows defining transversal stretching--dominated strike-slip MCCs, which would represent the early development stages of longitudinal stretching--dominated strike-slip MCCs. Conversely, longitudinal stretching--dominated strike-slip MCCs produced at low finite extension would result from strike-slip--dominated transtension. This study bears important implications for lower crust exhumation under pull-apart basin systems in obliquely convergent or divergent settings. |
Nomo, E. N., Tchameni, R., Vanderhaeghe, O., Sun, F., Barbey, P., Tekoum, L., Tchunte, P. M. F., Eglinger, A., Fouotsa, N. A. S. Structure and LA-ICP-MS zircon U--Pb dating of syntectonic plutons emplaced in the Pan-African Banyo-Tcholliré shear zone (central north Cameroon) (Article de journal) Dans: Journal of African Earth Sciences, vol. 131, p. 251–271, 2017. @article{Nomo_etal2017,
title = {Structure and LA-ICP-MS zircon U--Pb dating of syntectonic plutons emplaced in the Pan-African Banyo-Tchollir\'{e} shear zone (central north Cameroon)},
author = {E. N. Nomo and R. Tchameni and O. Vanderhaeghe and F. Sun and P. Barbey and L. Tekoum and P. M. F. Tchunte and A. Eglinger and N. A. S. Fouotsa},
doi = {10.1016/j.jafrearsci.2017.04.002},
year = {2017},
date = {2017-01-01},
journal = {Journal of African Earth Sciences},
volume = {131},
pages = {251--271},
abstract = {The Tchollir\'{e} massif, in central north Cameroon, consists of elongated granite plutons that crop out along the Pan-African Tchollir\'{e}-Banyo shear zone (TBSZ), a potential suture zone within the Central Africa Orogenic Belt. New structural and geochronological data on these granites constrain the tectonic regime and timing of the TBSZ. The plutons consist of syntectonic granites and granodiorite containing dioritic mafic enclaves. They show an S2 sub-vertical foliation, that trends NE-SW to ENE-WSW. The related L2 lineation is subhorizontal to shallowly plunging to the SW or NE. Kinematic indicators such as asymmetric folds, sigmoidal-shape boudins, shear bands, imbricated feldspar phenocrysts along antithetic fractures point to a sinistral sense of shear. Microstructural analysis shows that structures are acquired from the submagmatic to the low temperature solid state suggesting progressive deformation of the magma during its emplacement, crystallization and cooling. U-Pb zircon dating on this massif yields emplacement ages of 719 textpm 12 Ma for the biotite-amphibole granite and muscovite granite, 652.2 textpm 5.4 Ma for the biotite-granite and 632 textpm 13 Ma for the leucogranite. These geochronological data show in addition, Palaeoproterozoic inherited ages of 1631 textpm 30 Ma on the leucogranites of this massif, and point to a Palaeoproterozoic contribution in their genesis. The range of ages (ca. 87 Ma) points to the timing of syntectonic emplacement of felsic magmas coeval with sinistral transpression along the TBSZ during the Pan-African orogeny. These results show that the TBSZ has recorded prolonged deformation associated with crustal magmatism between the Palaeoproterozoic Adamawa-Yad\'{e} domain to the southeast and the Sinassi-Mayo Kebbi Neoproterozoic magmatic arc to the Northwest.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The Tcholliré massif, in central north Cameroon, consists of elongated granite plutons that crop out along the Pan-African Tcholliré-Banyo shear zone (TBSZ), a potential suture zone within the Central Africa Orogenic Belt. New structural and geochronological data on these granites constrain the tectonic regime and timing of the TBSZ. The plutons consist of syntectonic granites and granodiorite containing dioritic mafic enclaves. They show an S2 sub-vertical foliation, that trends NE-SW to ENE-WSW. The related L2 lineation is subhorizontal to shallowly plunging to the SW or NE. Kinematic indicators such as asymmetric folds, sigmoidal-shape boudins, shear bands, imbricated feldspar phenocrysts along antithetic fractures point to a sinistral sense of shear. Microstructural analysis shows that structures are acquired from the submagmatic to the low temperature solid state suggesting progressive deformation of the magma during its emplacement, crystallization and cooling. U-Pb zircon dating on this massif yields emplacement ages of 719 textpm 12 Ma for the biotite-amphibole granite and muscovite granite, 652.2 textpm 5.4 Ma for the biotite-granite and 632 textpm 13 Ma for the leucogranite. These geochronological data show in addition, Palaeoproterozoic inherited ages of 1631 textpm 30 Ma on the leucogranites of this massif, and point to a Palaeoproterozoic contribution in their genesis. The range of ages (ca. 87 Ma) points to the timing of syntectonic emplacement of felsic magmas coeval with sinistral transpression along the TBSZ during the Pan-African orogeny. These results show that the TBSZ has recorded prolonged deformation associated with crustal magmatism between the Palaeoproterozoic Adamawa-Yadé domain to the southeast and the Sinassi-Mayo Kebbi Neoproterozoic magmatic arc to the Northwest. |
Tchakounte, J., Eglinger, A., Toteu, S. F., Zeh, A., Nkoumbou, C., Mvondo-Ondoa, J., Penaye, J., Wit, M., Barbey, P. The Adamawa-Yadé domain, a piece of Archaean crust in the Neoproterozoic Central African Orogenic belt (Bafia area, Cameroon) (Article de journal) Dans: Precambrian Research, vol. 299, p. 210–229, 2017. @article{Tchakounte_etal2017,
title = {The Adamawa-Yad\'{e} domain, a piece of Archaean crust in the Neoproterozoic Central African Orogenic belt (Bafia area, Cameroon)},
author = {J. Tchakounte and A. Eglinger and S. F. Toteu and A. Zeh and C. Nkoumbou and J. Mvondo-Ondoa and J. Penaye and M. Wit and P. Barbey},
doi = {10.1016/j.precamres.2017.07.001},
year = {2017},
date = {2017-01-01},
journal = {Precambrian Research},
volume = {299},
pages = {210--229},
abstract = {New field observations, ages and geochemical data are presented for the Adamawa-Yad\'{e} domain, forming part of Central African Orogenic Belt in Cameroon. This belt delineates the northern margin of the Congo craton and is part of the Braziliano/Pan-African orogenic system, which was formed during amalgamation of the West Gondwana continent at the end of the Neoproterozoic.U--Pb dating indicates that the protoliths of some orthogneisses from the Adamawa-Yad\'{e} domain were emplaced during three distinct periods. Tonalite-Trondhjemite-Granodiorite (TTG) suites in the Mak\'{e}n\'{e}n\'{e} area intruded at ca. 3.0--2.5 Ga, and were affected by partial melting at ca. 2.08--2.07 Ga, during the Eburnean orogeny, and by a magmatic event with a metamorphic overprint at 0.64--0.61 Ga, during the Pan-African orogeny. A dioritic orthogneiss from the Maham area, north of Mak\'{e}n\'{e}n\'{e}, was emplaced at 2.07 Ga and also reworked at 0.62--0.61 Ga. The youngest granitic orthogneisses, sampled in the vicinity of Bafia, Bep and Ngaa-Bap\'{e}, yield intrusion ages of 0.64--0.63 Ga. Some of these Neoproterozoic plutonic rocks show shoshonitic affinity and reveal $epsilon$Nd(630 Ma) values ranging from −1.2 to −6.9 (1.7 \> TDM \> 1.1 Ga), and 87Sr/86Sr initial ratios of 0.706 and 0.704, providing evidence for crustal reworking during the Pan-African collision. The isotopic geochemical characteristics provide evidence that potassic magmas result from the interaction between the Archaean TTG continental crust and magmas derived from a mantle enriched in silica and incompatible elements during subduction underneath a continental margin. The Bafia group appears as a complex geological entity comprised of an Archaean/Palaeoproterozoic basement and its Neoproterozoic sedimentary cover, both deformed and recrystallized at ca. 0.61 Ga.The crustal evolution of the Adamawa-Yad\'{e} domain is very similar to that inferred for the northern margin of the Congo craton (the Ntem complex and Nyong series). This and the sedimentary record suggest that the Adamawa-Yad\'{e} domain represents an Archaean/Palaeoproterozoic microcontinent, which was detached from the northern margin of the Congo craton in the early Neoproterozoic, but became re-accreted together with the Mayo Kebbi (magmatic) arc during the Pan-African orogeny.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
New field observations, ages and geochemical data are presented for the Adamawa-Yadé domain, forming part of Central African Orogenic Belt in Cameroon. This belt delineates the northern margin of the Congo craton and is part of the Braziliano/Pan-African orogenic system, which was formed during amalgamation of the West Gondwana continent at the end of the Neoproterozoic.U--Pb dating indicates that the protoliths of some orthogneisses from the Adamawa-Yadé domain were emplaced during three distinct periods. Tonalite-Trondhjemite-Granodiorite (TTG) suites in the Makénéné area intruded at ca. 3.0--2.5 Ga, and were affected by partial melting at ca. 2.08--2.07 Ga, during the Eburnean orogeny, and by a magmatic event with a metamorphic overprint at 0.64--0.61 Ga, during the Pan-African orogeny. A dioritic orthogneiss from the Maham area, north of Makénéné, was emplaced at 2.07 Ga and also reworked at 0.62--0.61 Ga. The youngest granitic orthogneisses, sampled in the vicinity of Bafia, Bep and Ngaa-Bapé, yield intrusion ages of 0.64--0.63 Ga. Some of these Neoproterozoic plutonic rocks show shoshonitic affinity and reveal $epsilon$Nd(630 Ma) values ranging from −1.2 to −6.9 (1.7 > TDM > 1.1 Ga), and 87Sr/86Sr initial ratios of 0.706 and 0.704, providing evidence for crustal reworking during the Pan-African collision. The isotopic geochemical characteristics provide evidence that potassic magmas result from the interaction between the Archaean TTG continental crust and magmas derived from a mantle enriched in silica and incompatible elements during subduction underneath a continental margin. The Bafia group appears as a complex geological entity comprised of an Archaean/Palaeoproterozoic basement and its Neoproterozoic sedimentary cover, both deformed and recrystallized at ca. 0.61 Ga.The crustal evolution of the Adamawa-Yadé domain is very similar to that inferred for the northern margin of the Congo craton (the Ntem complex and Nyong series). This and the sedimentary record suggest that the Adamawa-Yadé domain represents an Archaean/Palaeoproterozoic microcontinent, which was detached from the northern margin of the Congo craton in the early Neoproterozoic, but became re-accreted together with the Mayo Kebbi (magmatic) arc during the Pan-African orogeny. |
2014
|
Nkoumbou, C., Barbey, P., Yonta-Ngoune, C., Paquette, J. L., Villiéras, F. Pre-collisional geodynamic context of the southern margin of the Pan-African fold belt in Cameroon (Article de journal) Dans: Journal of African Earth Sciences, vol. 99, p. 245–260, 2014. @article{Nkoumbou_etal2014,
title = {Pre-collisional geodynamic context of the southern margin of the Pan-African fold belt in Cameroon},
author = {C. Nkoumbou and P. Barbey and C. Yonta-Ngoune and J. L. Paquette and F. Villi\'{e}ras},
doi = {10.1016/j.jafrearsci.2013.10.002},
year = {2014},
date = {2014-01-01},
journal = {Journal of African Earth Sciences},
volume = {99},
pages = {245--260},
abstract = {We reassess the geodynamic context close to the Congo craton during the pre-collisional period of the Pan-African orogeny from whole-rock major and trace element compositions and isotopic data obtained in the westward extension of the Yaounde series (Boumnyebel area, Cameroon). The series consists of metasediments (micaschists, minor calc-silicate rocks and marbles) and meta-igneous rocks (hornblende gneisses, amphibolites, metagabbros, pyroxenites and talcschists) recrystallized under high-pressure conditions.Chemically, the micaschists correspond to shales and greywackes similar to the Yaounde high-grade gneisses.87Sr/86Sr initial ratios (0.7084--0.7134), moderately negative eNd(620 Ma)values (-5.75to-7.81), Nd model ages (1.66 \<TDM\< 1.74 Ga) and radiometric ages point to the conclusion that theYaounde basin was filled with siliciclastic sediments derived from both reworked older continental crust(Palaeoproterozoic to Archaean in age) and Neoproterozoic juvenile volcanogenic material. This occurredin the same time span (625--1100 Ma) as the deposition of the Lower Dja, Yokadouma, Nola and Mintom series (Tonian--Cryogenian). Dolomitic marble associated with mafic/ultramafic rocks and characterized by high Cr (854--1371 ppm) and Ni (517--875 ppm) contents, are considered to result from chemical precipitation in relation with submarine magmatic activity.Talcschists (orthopyroxenitic to harzburgitic in composition) show primitive-mantle-normalized multi-element patterns with significant negative Nb--Ta anomalies, and slopes similar to that of average metasomatically altered lithospheric mantle. These rocks could be mantle slices involved in the collisiontectonics. Amphibolites show the compositions of island-arc basalts with systematic negative Nb--Ta anomalies, 87Sr/86Sr initial ratios mostly \<0.7047 and positive eNd(620 Ma)values (+1.41 to +6.58). They are considered to be the expression of incipient oceanisation to the north of the Congo craton duringthe early Neoproterozoic. Hornblende gneisses show andesitic compositions, with high 87Sr/86Sr initialratios (0.7105 and 0.7125) and low e Nd(620)values (-14.0 and-20.7) suggesting that their genesis involved juvenile and recycled older crustal materials. Syn-metamorphic metagabbro (Mamb) and metadiorite (Yaounde) intrusions show negative Nb--Ta negative anomalies but enrichment in light rare-earth and large-ion lithophile elements, suggesting a metasomatized mantle source. Overall,meta-igneous rocks seem to be representative of distinct magmatic events that accompanied the evolution of the Yaounde sedimentary basin, from opening and oceanisation to convergence and closure in relation with the collisional process.These data suggest that the Yaounde basin should not be considered as a back-arc basin, but more likely represents the expression of extensional processes to the north of the Congo craton, which led to rifting, fragmentation and limited oceanisation. In this view, the Adamawa-Yade block may represent a micro-continent detached from the Congo craton during the early Neoproterozoic},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We reassess the geodynamic context close to the Congo craton during the pre-collisional period of the Pan-African orogeny from whole-rock major and trace element compositions and isotopic data obtained in the westward extension of the Yaounde series (Boumnyebel area, Cameroon). The series consists of metasediments (micaschists, minor calc-silicate rocks and marbles) and meta-igneous rocks (hornblende gneisses, amphibolites, metagabbros, pyroxenites and talcschists) recrystallized under high-pressure conditions.Chemically, the micaschists correspond to shales and greywackes similar to the Yaounde high-grade gneisses.87Sr/86Sr initial ratios (0.7084--0.7134), moderately negative eNd(620 Ma)values (-5.75to-7.81), Nd model ages (1.66 <TDM< 1.74 Ga) and radiometric ages point to the conclusion that theYaounde basin was filled with siliciclastic sediments derived from both reworked older continental crust(Palaeoproterozoic to Archaean in age) and Neoproterozoic juvenile volcanogenic material. This occurredin the same time span (625--1100 Ma) as the deposition of the Lower Dja, Yokadouma, Nola and Mintom series (Tonian--Cryogenian). Dolomitic marble associated with mafic/ultramafic rocks and characterized by high Cr (854--1371 ppm) and Ni (517--875 ppm) contents, are considered to result from chemical precipitation in relation with submarine magmatic activity.Talcschists (orthopyroxenitic to harzburgitic in composition) show primitive-mantle-normalized multi-element patterns with significant negative Nb--Ta anomalies, and slopes similar to that of average metasomatically altered lithospheric mantle. These rocks could be mantle slices involved in the collisiontectonics. Amphibolites show the compositions of island-arc basalts with systematic negative Nb--Ta anomalies, 87Sr/86Sr initial ratios mostly <0.7047 and positive eNd(620 Ma)values (+1.41 to +6.58). They are considered to be the expression of incipient oceanisation to the north of the Congo craton duringthe early Neoproterozoic. Hornblende gneisses show andesitic compositions, with high 87Sr/86Sr initialratios (0.7105 and 0.7125) and low e Nd(620)values (-14.0 and-20.7) suggesting that their genesis involved juvenile and recycled older crustal materials. Syn-metamorphic metagabbro (Mamb) and metadiorite (Yaounde) intrusions show negative Nb--Ta negative anomalies but enrichment in light rare-earth and large-ion lithophile elements, suggesting a metasomatized mantle source. Overall,meta-igneous rocks seem to be representative of distinct magmatic events that accompanied the evolution of the Yaounde sedimentary basin, from opening and oceanisation to convergence and closure in relation with the collisional process.These data suggest that the Yaounde basin should not be considered as a back-arc basin, but more likely represents the expression of extensional processes to the north of the Congo craton, which led to rifting, fragmentation and limited oceanisation. In this view, the Adamawa-Yade block may represent a micro-continent detached from the Congo craton during the early Neoproterozoic |
2013
|
Bouyo, M. H., Penaye, J., Barbey, P., Toteu, S. F., Wandji, P. Petrology of high-pressure granulite facies metapelites and metabasites from Tcholliré and Banyo regions: Geodynamic implication for the Central African Fold Belt (CAFB) of north-central Cameroon (Article de journal) Dans: Precambrian Research, vol. 224, p. 412–433, 2013. @article{Bouyo_etal2013,
title = {Petrology of high-pressure granulite facies metapelites and metabasites from Tchollir\'{e} and Banyo regions: Geodynamic implication for the Central African Fold Belt (CAFB) of north-central Cameroon},
author = {M. H. Bouyo and J. Penaye and P. Barbey and S. F. Toteu and P. Wandji},
doi = {10.1016/j.precamres.2012.09.025},
year = {2013},
date = {2013-01-01},
journal = {Precambrian Research},
volume = {224},
pages = {412--433},
abstract = {The Tchollir\'{e} and Banyo high-pressure granulites occur mainly as highly strained small lenses, bands or elongated bodies interbedded with gneisses and migmatites in the Central African Fold Belt (CAFB) in north-central Cameroon. They were previously attributed to Palaeoproterozoic but are now shown to be Pan-African. These granulites are made up of two occurrences of metapelites with garnet-kyanite-sillimanite-cordierite-biotite-quartz-plagioclase and metabasites containing garnetclinopyroxene- orthopyroxene-hornblende-quartz-plagioclase.Eight samples were analysed in detail by electron microprobe for mineral chemistry.Parageneses in both metapelites and metabasites highlight three main stages witnessed by prograde, peak and retrograde mineral assemblages. The prograde stage is preserved as well-defined inclusion trails of kyanite, biotite, plagioclase, quartz, and rutile within porphyroblasts of garnet in metapelites; or with more or less clinopyroxene, hornblende, plagioclase, quartz, ilmenite, rutile andapatite, within porphyroblasts of garnet in metabasites. The peak stage, displaying heterogranular granoblastic texture is characterised by porphyroblastic garnet-kyanite-K-feldspar-biotite in metapelites and garnet-clinopyroxene-plagioclase-quartz in metabasites. This was followed by decompression andcooling during the retrograde stage marked by aggregate of sillimanite prisms presumably after kyanite and cordierite corona around garnet in metapelites and by symplectites or vermicular structures of orthopyroxene-plagioclase and orthopyroxene corona around garnet in metabasites. Geothermobarometricstudy shows that granulite facies metapelites and metabasites from both Tchollir\'{e} and Banyo regions recrystallised under peak pressure-temperature conditions of 13--14 kbar and 800--900 ◦C. They experienced similar clockwise P-T path with nearly isothermal decompression. Our results provide evidence for a substantial crustal thickening during the Pan-African continent--continent collision but show that there is no significant isothermal decompression as commonly observed in recent collisional orogens. The reconstructed P-T paths are in some ways reminiscentof the ones reported in Precambrian textquotelefttextquoteleftmixed-hot orogenstextquoterighttextquoteright.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The Tcholliré and Banyo high-pressure granulites occur mainly as highly strained small lenses, bands or elongated bodies interbedded with gneisses and migmatites in the Central African Fold Belt (CAFB) in north-central Cameroon. They were previously attributed to Palaeoproterozoic but are now shown to be Pan-African. These granulites are made up of two occurrences of metapelites with garnet-kyanite-sillimanite-cordierite-biotite-quartz-plagioclase and metabasites containing garnetclinopyroxene- orthopyroxene-hornblende-quartz-plagioclase.Eight samples were analysed in detail by electron microprobe for mineral chemistry.Parageneses in both metapelites and metabasites highlight three main stages witnessed by prograde, peak and retrograde mineral assemblages. The prograde stage is preserved as well-defined inclusion trails of kyanite, biotite, plagioclase, quartz, and rutile within porphyroblasts of garnet in metapelites; or with more or less clinopyroxene, hornblende, plagioclase, quartz, ilmenite, rutile andapatite, within porphyroblasts of garnet in metabasites. The peak stage, displaying heterogranular granoblastic texture is characterised by porphyroblastic garnet-kyanite-K-feldspar-biotite in metapelites and garnet-clinopyroxene-plagioclase-quartz in metabasites. This was followed by decompression andcooling during the retrograde stage marked by aggregate of sillimanite prisms presumably after kyanite and cordierite corona around garnet in metapelites and by symplectites or vermicular structures of orthopyroxene-plagioclase and orthopyroxene corona around garnet in metabasites. Geothermobarometricstudy shows that granulite facies metapelites and metabasites from both Tcholliré and Banyo regions recrystallised under peak pressure-temperature conditions of 13--14 kbar and 800--900 ◦C. They experienced similar clockwise P-T path with nearly isothermal decompression. Our results provide evidence for a substantial crustal thickening during the Pan-African continent--continent collision but show that there is no significant isothermal decompression as commonly observed in recent collisional orogens. The reconstructed P-T paths are in some ways reminiscentof the ones reported in Precambrian textquotelefttextquoteleftmixed-hot orogenstextquoterighttextquoteright. |
Nkoumbou, C., Barbey, P., Yonta-Ngoune, C., Paquette, J. L., Villiéras, F. Pre-collisional geodynamic context of the southern margin of the Pan-African fold belt in Cameroon (Article de journal) Dans: Journal of African Earth Sciences, 2013. @article{Nkoumbou_etal2013,
title = {Pre-collisional geodynamic context of the southern margin of the Pan-African fold belt in Cameroon},
author = {C. Nkoumbou and P. Barbey and C. Yonta-Ngoune and J. L. Paquette and F. Villi\'{e}ras},
doi = {10.1016/j.jafrearsci.2013.10.002},
year = {2013},
date = {2013-01-01},
journal = {Journal of African Earth Sciences},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2012
|
Den`ele, Y., Paquette, J. L., Olivier, P., Barbey, P. Permian granites in the Pyrenees: the Aya pluton (Basque Country) (Article de journal) Dans: Terra Nova, vol. 24, no. 2, p. 1–9, 2012. @article{Denle_etal2012_2,
title = {Permian granites in the Pyrenees: the Aya pluton (Basque Country)},
author = {Y. Den`ele and J. L. Paquette and P. Olivier and P. Barbey},
doi = {10.1111/j.1365-3121.2011.01043.x},
year = {2012},
date = {2012-01-01},
journal = {Terra Nova},
volume = {24},
number = {2},
pages = {1--9},
abstract = {We show that the Permian volcanism in the Pyrenees wasaccompanied with emplacement of granite plutons with transitionalchemistry. Reassessment of age, structure and petrologicalcharacteristics of the Aya pluton, intrusive in the CincoVillas massif (Basque Country), indicates that it was emplacedat 267.1 textpm 1.1 Ma in a dextral transtensive context and that itmarks a transition between the high-K calcalkaline and thealkaline emissions of the first and second Permian volcaniccycles, respectively. This age is close to that of c. 267 Mareported for lamprophyres dykes of the Pyrenean Axial Zone.These data characterize a period of transition between theVariscan orogeny and the subsequent Alpine cycle in thePyrenees, with an earlier extensive regime that becamewidespread in the Pyrenees during the Mesozoic times.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We show that the Permian volcanism in the Pyrenees wasaccompanied with emplacement of granite plutons with transitionalchemistry. Reassessment of age, structure and petrologicalcharacteristics of the Aya pluton, intrusive in the CincoVillas massif (Basque Country), indicates that it was emplacedat 267.1 textpm 1.1 Ma in a dextral transtensive context and that itmarks a transition between the high-K calcalkaline and thealkaline emissions of the first and second Permian volcaniccycles, respectively. This age is close to that of c. 267 Mareported for lamprophyres dykes of the Pyrenean Axial Zone.These data characterize a period of transition between theVariscan orogeny and the subsequent Alpine cycle in thePyrenees, with an earlier extensive regime that becamewidespread in the Pyrenees during the Mesozoic times. |
Isseini, M., André-Mayer, A. S., Vanderhaeghe, O., Barbey, P., Deloule, E. A-type granites from the Pan-African orogenic belt in south-western Chad constrained using geochemistry, Sr--Nd isotopes and U--Pb geochronology (Article de journal) Dans: Lithos, vol. 153, p. 39–52, 2012. @article{Isseini_etal2012,
title = {A-type granites from the Pan-African orogenic belt in south-western Chad constrained using geochemistry, Sr--Nd isotopes and U--Pb geochronology},
author = {M. Isseini and A. S. Andr\'{e}-Mayer and O. Vanderhaeghe and P. Barbey and E. Deloule},
doi = {10.1016/j.lithos.2012.07.014},
year = {2012},
date = {2012-01-01},
journal = {Lithos},
volume = {153},
pages = {39--52},
abstract = {The Zabili granitic pluton (SW Chad) exposed in the Mayo Kebbi massif is dominated by a coarse-grained hornblende biotite granite grading into a fine-grained biotite granite along its southern margin. Petrologic (micrographic intergrowth of quartz and alkali feldspars, granophyric microstructures, the presence of fluoriteand bastnaesite as accessory minerals) and geochemical data (high silica, alkalis and Fe/Mg, depletions in CaO, MgO, TiO2; high Ga, Nb, Zr, Ga/Al, REE, depletions in Ba, Sr, Eu and compatible elements) indicate that this pluton consists of A-type granites crystallized from hot (apatite and zircon saturation temperatures ranging from 744 textdegreeC to 923 textdegreeC), extremely differentiated magmas. U--Pb zircon geochronology indicates that the magmas crystallized at 567textpm10 Ma and reveals the presence of older Neoproterozoic xenocrystic zircons at 668textpm5 Ma in both facies. Within the fine-grained biotite granite, discordant zircons with U--Pb and Pb--Pbages ranging from Neoproterozoic to Archaean are also reported. The 668textpm5 Ma old zircons are considered to derive from country-rocks while discordant zircons, characterized by angular shapes, internal fractures and inherited cores, are likely to represent multi-sources detrital crystals that have recorded at least onemetamorphic event. Old pre-Neoproterozoic zircons are reported for the first time for rocks of the Mayo Kebbi massif and they attest to the contribution of an old basement (likely to be the Eastern Nigeria basement and/or the Congo craton) involved in a collisional event with a juvenile Neoproterozoic crust prior to theemplacement of the Zabili granitic pluton. Initial $epsilon$Nd values calculated for the Zabili pluton range from +2.6 to +7.0, the highest value recorded by one sample from the coarse-grained hornblende-biotite granite being close to the one of the depleted mantle at 570 Ma ($epsilon$Nd=+7.4). Combining geochronology, Nd isotopescomposition and geochemical modeling, leads us to suggest the following model for the origin of the Zabili granitic pluton: (i) contribution of juvenile magmas or partial melting of a juvenile basaltic protolith characterized by a short crustal residence time; (ii) interaction of granitic magmas with older continentalmaterials as suggested by the presence of pre-Neoproterozoic zircons and lower initial $epsilon$Nd values of the fine-grained biotite granite; and (iii) fractional crystallization of feldspars and ferromagnesians to produce the observed geochemical features of sample GAB-B, from which an initial $epsilon$Nd value of +7.0 has been calculated.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The Zabili granitic pluton (SW Chad) exposed in the Mayo Kebbi massif is dominated by a coarse-grained hornblende biotite granite grading into a fine-grained biotite granite along its southern margin. Petrologic (micrographic intergrowth of quartz and alkali feldspars, granophyric microstructures, the presence of fluoriteand bastnaesite as accessory minerals) and geochemical data (high silica, alkalis and Fe/Mg, depletions in CaO, MgO, TiO2; high Ga, Nb, Zr, Ga/Al, REE, depletions in Ba, Sr, Eu and compatible elements) indicate that this pluton consists of A-type granites crystallized from hot (apatite and zircon saturation temperatures ranging from 744 textdegreeC to 923 textdegreeC), extremely differentiated magmas. U--Pb zircon geochronology indicates that the magmas crystallized at 567textpm10 Ma and reveals the presence of older Neoproterozoic xenocrystic zircons at 668textpm5 Ma in both facies. Within the fine-grained biotite granite, discordant zircons with U--Pb and Pb--Pbages ranging from Neoproterozoic to Archaean are also reported. The 668textpm5 Ma old zircons are considered to derive from country-rocks while discordant zircons, characterized by angular shapes, internal fractures and inherited cores, are likely to represent multi-sources detrital crystals that have recorded at least onemetamorphic event. Old pre-Neoproterozoic zircons are reported for the first time for rocks of the Mayo Kebbi massif and they attest to the contribution of an old basement (likely to be the Eastern Nigeria basement and/or the Congo craton) involved in a collisional event with a juvenile Neoproterozoic crust prior to theemplacement of the Zabili granitic pluton. Initial $epsilon$Nd values calculated for the Zabili pluton range from +2.6 to +7.0, the highest value recorded by one sample from the coarse-grained hornblende-biotite granite being close to the one of the depleted mantle at 570 Ma ($epsilon$Nd=+7.4). Combining geochronology, Nd isotopescomposition and geochemical modeling, leads us to suggest the following model for the origin of the Zabili granitic pluton: (i) contribution of juvenile magmas or partial melting of a juvenile basaltic protolith characterized by a short crustal residence time; (ii) interaction of granitic magmas with older continentalmaterials as suggested by the presence of pre-Neoproterozoic zircons and lower initial $epsilon$Nd values of the fine-grained biotite granite; and (iii) fractional crystallization of feldspars and ferromagnesians to produce the observed geochemical features of sample GAB-B, from which an initial $epsilon$Nd value of +7.0 has been calculated. |
2011
|
Cagnard, F., Barbey, P., Gapais, D. Transition between textquotelefttextquoteleftArchaean-typetextquoterighttextquoteright and textquotelefttextquoteleftmodern-typetextquoterighttextquoteright tectonics: Insights from the Finnish Lapland Granulite Belt (Article de journal) Dans: Precambrian Research, vol. 187, no. 1-2, p. 127–142, 2011. @article{Cagnard_etal2011,
title = {Transition between textquotelefttextquoteleftArchaean-typetextquoterighttextquoteright and textquotelefttextquoteleftmodern-typetextquoterighttextquoteright tectonics: Insights from the Finnish Lapland Granulite Belt},
author = {F. Cagnard and P. Barbey and D. Gapais},
doi = {10.1016/j.precamres.2011.02.007},
year = {2011},
date = {2011-01-01},
journal = {Precambrian Research},
volume = {187},
number = {1-2},
pages = {127--142},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2010
|
Yonta-Ngoune, C., Nkoumbou, C., Barbey, P., Breton, N. Le, Montel, J. M., Villieras, F. Geological context of the Boumnyebel talcschists (Cameroun): Inferences on the Pan-African Belt of Central Africa (Article de journal) Dans: Comptes Rendus. Géoscience, vol. 342, no. 2, p. 108–115, 2010. @article{Yonta-Ngoune_etal2010,
title = {Geological context of the Boumnyebel talcschists (Cameroun): Inferences on the Pan-African Belt of Central Africa},
author = {C. Yonta-Ngoune and C. Nkoumbou and P. Barbey and N. Le Breton and J. M. Montel and F. Villieras},
doi = {10.1016/j.crte.2009.12.007},
year = {2010},
date = {2010-01-01},
journal = {Comptes Rendus. G\'{e}oscience},
volume = {342},
number = {2},
pages = {108--115},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2009
|
Barbey, P. Layering and Schlieren in Granitoids: a Record of Interactions between Magma Emplacement, Crystallization and Deformation in Growing Plutons (Article de journal) Dans: Geologica Belgica, vol. 12, no. 3-4, p. 109–133, 2009, ISSN: 1374-8505. @article{Barbey2009,
title = {Layering and Schlieren in Granitoids: a Record of Interactions between Magma Emplacement, Crystallization and Deformation in Growing Plutons},
author = {P. Barbey},
issn = {1374-8505},
year = {2009},
date = {2009-01-01},
journal = {Geologica Belgica},
volume = {12},
number = {3-4},
pages = {109--133},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barros, C. E. M., Sardinha, A. S., Barbosa, J. P. O., Macambira, M. J. B., Barbey, P., Boullier, A. M. Structure, petrology, geochemistry and zircon U/Pb and Pb/Pb geochrolology of the synkinematic archean (2.7 Ga) A-type granites from the Carjas metallogenic Province, Northern Brazil (Article de journal) Dans: Canadian Mineralogist, vol. 47, no. 6, p. 1423–1440, 2009. @article{Barros_etal2009,
title = {Structure, petrology, geochemistry and zircon U/Pb and Pb/Pb geochrolology of the synkinematic archean (2.7 Ga) A-type granites from the Carjas metallogenic Province, Northern Brazil},
author = {C. E. M. Barros and A. S. Sardinha and J. P. O. Barbosa and M. J. B. Macambira and P. Barbey and A. M. Boullier},
year = {2009},
date = {2009-01-01},
journal = {Canadian Mineralogist},
volume = {47},
number = {6},
pages = {1423--1440},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Denele, Y., Barbey, P., Deloule, E., Pelleter, E., Olivier, P., Gleizes, G. Middle Ordovician U-Pb age of the Aston and Hospitalet orthogneissic laccoliths: their role in the Variscan evolution of the Pyrenees (Article de journal) Dans: Bulletin de la Société Géologique de France, vol. 180, no. 3, p. 209–216, 2009. @article{Denele_etal2009,
title = {Middle Ordovician U-Pb age of the Aston and Hospitalet orthogneissic laccoliths: their role in the Variscan evolution of the Pyrenees},
author = {Y. Denele and P. Barbey and E. Deloule and E. Pelleter and P. Olivier and G. Gleizes},
year = {2009},
date = {2009-01-01},
journal = {Bulletin de la Soci\'{e}t\'{e} G\'{e}ologique de France},
volume = {180},
number = {3},
pages = {209--216},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Denele, Y., Olivier, P., Gleizes, G., Barbey, P. Decoupling between the middle and upper crust during transpression-related lateral flow: Variscan evolution of the Aston gneiss dome (Pyrenees, France) (Article de journal) Dans: Tectonophysics, vol. 477, no. 3-4, p. 244–261, 2009, ISSN: 0040-1951. @article{Denele_etal2009_2,
title = {Decoupling between the middle and upper crust during transpression-related lateral flow: Variscan evolution of the Aston gneiss dome (Pyrenees, France)},
author = {Y. Denele and P. Olivier and G. Gleizes and P. Barbey},
doi = {10.1016/j.tecto.2009.04.033},
issn = {0040-1951},
year = {2009},
date = {2009-01-01},
journal = {Tectonophysics},
volume = {477},
number = {3-4},
pages = {244--261},
abstract = {We present a structural, AMS, microstructural and kinematic study of the Aston gneiss dome (French Pyrenees), which consists of a core made up of orthogneiss and paragneiss intruded by numerous sills of Carboniferous peraluminous granite. The orthogneiss corresponds to a former Ordovician granitic laccolith. Four Variscan events have been evidenced in this gneiss dome: (i) D1 deformation observed only as relics in the orthogneisses and their country-rocks located above the sillimanite isograd, and characterized by a NS to NE-SW non coaxial stretch associated to top to the south motions (NS convergence); (ii) D2-a deformation observed in the orthogneisses and their country-rocks, mainly migmatitic paragneisses, located below the sillimanite isograd and in the peraluminous granites whatever their structural level, and characterized by an EW to N120 degrees E stretch associated to a top to the east flat shearing (lateral flow in the hot middle crust in a transpressive regime); (iii) D2-b deformation characterized by EW-trending megafolds corresponding to the domes in the middle crust and by EW-trending tight folds with subvertical axial planes in the metasedimentary upper crust; (iv) subvertical medium-temperature mylonitic bands developed by the end of the transpression. The Aston massif is a good example of decoupling between a cold upper crust and a hotter middle crust overheated by a thermal event originated in the upper mantle. This decoupling allowed the lateral flow of the migmatitic middle crust along a direction at high angle with respect to the more or less NS-trending direction of convergence. We suggest that the HT-LP metamorphism developed before the formation of the domes during D2-a, coevally with the emplacement of numerous sills of peraluminous granite, whereas the emplacement of the large calc-alkaline plutons in the upper crust occurred by the end of D2-b. Our data invalidate the previous geodynamical models based on either early or late extensional regime to explain the development of the HT-LP metamorphism. This new interpretation of the dynamics of the Variscan crust of the Pyrenees is consistent with recent studies conducted in Archaean and Palaeoproterozoic hot continental crusts having undergone oblique convergence, and characterized by a competition between vertical thickening and lateral flow induced by the important theological contrast between two thermally different levels. (C) 2009 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We present a structural, AMS, microstructural and kinematic study of the Aston gneiss dome (French Pyrenees), which consists of a core made up of orthogneiss and paragneiss intruded by numerous sills of Carboniferous peraluminous granite. The orthogneiss corresponds to a former Ordovician granitic laccolith. Four Variscan events have been evidenced in this gneiss dome: (i) D1 deformation observed only as relics in the orthogneisses and their country-rocks located above the sillimanite isograd, and characterized by a NS to NE-SW non coaxial stretch associated to top to the south motions (NS convergence); (ii) D2-a deformation observed in the orthogneisses and their country-rocks, mainly migmatitic paragneisses, located below the sillimanite isograd and in the peraluminous granites whatever their structural level, and characterized by an EW to N120 degrees E stretch associated to a top to the east flat shearing (lateral flow in the hot middle crust in a transpressive regime); (iii) D2-b deformation characterized by EW-trending megafolds corresponding to the domes in the middle crust and by EW-trending tight folds with subvertical axial planes in the metasedimentary upper crust; (iv) subvertical medium-temperature mylonitic bands developed by the end of the transpression. The Aston massif is a good example of decoupling between a cold upper crust and a hotter middle crust overheated by a thermal event originated in the upper mantle. This decoupling allowed the lateral flow of the migmatitic middle crust along a direction at high angle with respect to the more or less NS-trending direction of convergence. We suggest that the HT-LP metamorphism developed before the formation of the domes during D2-a, coevally with the emplacement of numerous sills of peraluminous granite, whereas the emplacement of the large calc-alkaline plutons in the upper crust occurred by the end of D2-b. Our data invalidate the previous geodynamical models based on either early or late extensional regime to explain the development of the HT-LP metamorphism. This new interpretation of the dynamics of the Variscan crust of the Pyrenees is consistent with recent studies conducted in Archaean and Palaeoproterozoic hot continental crusts having undergone oblique convergence, and characterized by a competition between vertical thickening and lateral flow induced by the important theological contrast between two thermally different levels. (C) 2009 Elsevier B.V. All rights reserved. |
Gapais, D., Cagnard, F., Gueydan, F., Barbey, P., Ball`evre, M. Mountain building and exhumation processes through time: inferences from nature and models (Article de journal) Dans: Terra Nova, vol. 21, no. 3, p. 188–194, 2009. @article{Gapais_etal2009,
title = {Mountain building and exhumation processes through time: inferences from nature and models},
author = {D. Gapais and F. Cagnard and F. Gueydan and P. Barbey and M. Ball`evre},
doi = {10.1111/j.1365-3121.2009.00873.x},
year = {2009},
date = {2009-01-01},
journal = {Terra Nova},
volume = {21},
number = {3},
pages = {188--194},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Nkoumbou, C., Villieras, F., Barbey, P., Ngoune, C. Y., Joussemet, R., Diot, F., Njopwouo, D., Yvon, J. Ni-Co sulphide segregation in the Mamb pyroxenite intrusion, Cameroon (Article de journal) Dans: Comptes Rendus. Géoscience, vol. 341, no. 7, p. 517–525, 2009, ISSN: 1631-0713. @article{Nkoumbou_etal2009,
title = {Ni-Co sulphide segregation in the Mamb pyroxenite intrusion, Cameroon},
author = {C. Nkoumbou and F. Villieras and P. Barbey and C. Y. Ngoune and R. Joussemet and F. Diot and D. Njopwouo and J. Yvon},
doi = {10.1016/j.crte.2009.06.009},
issn = {1631-0713},
year = {2009},
date = {2009-01-01},
journal = {Comptes Rendus. G\'{e}oscience},
volume = {341},
number = {7},
pages = {517--525},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2008
|
Barbey, P., Gasquet, D., Pin, C., Bourgeix, A. L. Igneous banding, schlieren and mafic enclaves in calc-alkaline granites: The Budduso pluton (Sardinia) (Article de journal) Dans: Lithos, vol. 104, p. 147–163, 2008. @article{Barbey_etal2008,
title = {Igneous banding, schlieren and mafic enclaves in calc-alkaline granites: The Budduso pluton (Sardinia)},
author = {P. Barbey and D. Gasquet and C. Pin and A. L. Bourgeix},
doi = {10.1016/j.lithos.2007.12.004},
year = {2008},
date = {2008-01-01},
journal = {Lithos},
volume = {104},
pages = {147--163},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Charoy, B., Barbey, P. Ferromagnesian silicate association in S-type granites: the Darongshan granitic complex (Guangxi, South China) (Article de journal) Dans: Bulletin de la Société Géologique de France, vol. 179, no. 1, p. 13–28, 2008. @article{Charoy+Barbey2008,
title = {Ferromagnesian silicate association in S-type granites: the Darongshan granitic complex (Guangxi, South China)},
author = {B. Charoy and P. Barbey},
doi = {10.2113/gssgfbull.179.1.13},
year = {2008},
date = {2008-01-01},
journal = {Bulletin de la Soci\'{e}t\'{e} G\'{e}ologique de France},
volume = {179},
number = {1},
pages = {13--28},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Micheletti, F., Fornelli, A., Piccarreta, G., Barbey, P., Tiepolo, M. The basement of Calabria (southern Italy) within the context of the Southern European Variscides: LA-ICPMS and SIMS U--Pb zircon study (Article de journal) Dans: Lithos, vol. 104, no. 1-4, p. 1–11, 2008. @article{Micheletti_etal2008,
title = {The basement of Calabria (southern Italy) within the context of the Southern European Variscides: LA-ICPMS and SIMS U--Pb zircon study},
author = {F. Micheletti and A. Fornelli and G. Piccarreta and P. Barbey and M. Tiepolo},
doi = {10.1016/j.lithos.2007.11.003},
year = {2008},
date = {2008-01-01},
journal = {Lithos},
volume = {104},
number = {1-4},
pages = {1--11},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Pupier, E., Barbey, P., M.,, Toplis, Igneous layering, fractional crystallization and growth of granitic plutons: The Dolbel batholith in SW Niger (Article de journal) Dans: Journal of Petrology, vol. 49, no. 6, p. 1043–1068, 2008. @article{Pupier_etal2008,
title = {Igneous layering, fractional crystallization and growth of granitic plutons: The Dolbel batholith in SW Niger},
author = {E. Pupier and P. Barbey and M. and Toplis},
doi = {10.1093/petrology/egn017},
year = {2008},
date = {2008-01-01},
journal = {Journal of Petrology},
volume = {49},
number = {6},
pages = {1043--1068},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2007
|
Barbey, P. Diffusion-controlled biotite breakdown reaction textures at the solid/liquid transition in the continental crust (Article de journal) Dans: Contributions to Mineralogy and Petrology, vol. 154, p. 707–716, 2007. @article{Barbey2007,
title = {Diffusion-controlled biotite breakdown reaction textures at the solid/liquid transition in the continental crust},
author = {P. Barbey},
doi = {10.1007/s00410-007-0220-x},
year = {2007},
date = {2007-01-01},
journal = {Contributions to Mineralogy and Petrology},
volume = {154},
pages = {707--716},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Cagnard, F., Gapais, D., Barbey, P. Collision tectonics involving juvenile crust: the example of the southern Finnish Svecofennides (Article de journal) Dans: Precambrian Research, vol. 154, p. 125–141, 2007. @article{Cagnard_etal2007,
title = {Collision tectonics involving juvenile crust: the example of the southern Finnish Svecofennides},
author = {F. Cagnard and D. Gapais and P. Barbey},
doi = {10.1016/j.precamres.2006.12.011},
year = {2007},
date = {2007-01-01},
journal = {Precambrian Research},
volume = {154},
pages = {125--141},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Denele, Y., Olivier, P., Barbey, P. The Hospitalet gneiss dome (Pyrenees) revisited: lateral flow during Variscan transpression in the middle crust (Article de journal) Dans: Terra Nova, vol. 19, no. 6, p. 445–453, 2007. @article{Denele_etal2007,
title = {The Hospitalet gneiss dome (Pyrenees) revisited: lateral flow during Variscan transpression in the middle crust},
author = {Y. Denele and P. Olivier and P. Barbey},
doi = {10.1111/j.1365-3121.2007.00770.x},
year = {2007},
date = {2007-01-01},
journal = {Terra Nova},
volume = {19},
number = {6},
pages = {445--453},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Micheletti, F., Barbey, P., Fornelli, A., Piccarreta, G., Deloule, E. Latest Precambrian to Early Cambrian U-Pb zircon ages of augen gneisses from Calabria (Italy), with inference to the Alboran microplate in the evolution of the peri-Gondwana terranes (Article de journal) Dans: International Journal of Earth Sciences, vol. 96, no. 5, p. 843–860, 2007. @article{Micheletti_etal2007,
title = {Latest Precambrian to Early Cambrian U-Pb zircon ages of augen gneisses from Calabria (Italy), with inference to the Alboran microplate in the evolution of the peri-Gondwana terranes},
author = {F. Micheletti and P. Barbey and A. Fornelli and G. Piccarreta and E. Deloule},
doi = {10.1007/s00531-006-0136-0},
year = {2007},
date = {2007-01-01},
journal = {International Journal of Earth Sciences},
volume = {96},
number = {5},
pages = {843--860},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2006
|
Gleizes, G., Crevon, G., Asrat, A., Barbey, P. Structure, age and mode of emplacement of the Hercynian Borderes-Louron pluton (Central Pyrenees, France) (Article de journal) Dans: International Journal of Earth Sciences, vol. 95, no. 6, p. 1039–1052, 2006. @article{Gleizes_etal2006,
title = {Structure, age and mode of emplacement of the Hercynian Borderes-Louron pluton (Central Pyrenees, France)},
author = {G. Gleizes and G. Crevon and A. Asrat and P. Barbey},
doi = {10.1007/s00531-006-0088-4},
year = {2006},
date = {2006-01-01},
journal = {International Journal of Earth Sciences},
volume = {95},
number = {6},
pages = {1039--1052},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Pons, J., Barbey, P., Nachit, H., Burg, J. P. Development of igneous layering during growth of pluton: The Tarçouate Laccolith (Morocco) (Article de journal) Dans: Tectonophysics, vol. 413, p. 271–286, 2006. @article{Pons_etal2006,
title = {Development of igneous layering during growth of pluton: The Tar\c{c}ouate Laccolith (Morocco)},
author = {J. Pons and P. Barbey and H. Nachit and J. P. Burg},
doi = {10.1016/j.tecto.2005.11.005},
year = {2006},
date = {2006-01-01},
journal = {Tectonophysics},
volume = {413},
pages = {271--286},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2005
|
Ayalew, D., Marty, B., Barbey, P., Yirgu, G., Ketefo, E. Sub-lithospheric source for Quaternary alkaline Tepi shield, southwest Ethiopia (Article de journal) Dans: Geochemical Journal, vol. 39, p. 1–10, 2005. @article{Ayalew_etal2005,
title = {Sub-lithospheric source for Quaternary alkaline Tepi shield, southwest Ethiopia},
author = {D. Ayalew and B. Marty and P. Barbey and G. Yirgu and E. Ketefo},
year = {2005},
date = {2005-01-01},
journal = {Geochemical Journal},
volume = {39},
pages = {1--10},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barbey, P., Ayalew, D., Yirgu, G. Insight into origin of gabbro-dioritic cumulophyric aggregates from silicic ignimbrites: Sr and Ba zoning profiles of plagioclase phenocrysts from Oligocene Ethiopian Plateau rhyolites (Article de journal) Dans: Contributions to Mineralogy and Petrology, vol. 149, no. 2, p. 233–245, 2005. @article{Barbey_etal2005,
title = {Insight into origin of gabbro-dioritic cumulophyric aggregates from silicic ignimbrites: Sr and Ba zoning profiles of plagioclase phenocrysts from Oligocene Ethiopian Plateau rhyolites},
author = {P. Barbey and D. Ayalew and G. Yirgu},
doi = {10.1007/s00410-004-0647-2},
year = {2005},
date = {2005-01-01},
journal = {Contributions to Mineralogy and Petrology},
volume = {149},
number = {2},
pages = {233--245},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barbey, P., Macaudi`ere, J., Marignac, C., Jabbori, J. Les concentrations `a sillimanite du Sud de Velay et ltextquoterightévolution P-T-t fini-hercynienne dans le Massif central (France) (Article de journal) Dans: Comptes Rendus. Géoscience, vol. 337, no. 9, p. 872–879, 2005. @article{Barbey_etal2005_2,
title = {Les concentrations `a sillimanite du Sud de Velay et ltextquoteright\'{e}volution P-T-t fini-hercynienne dans le Massif central (France)},
author = {P. Barbey and J. Macaudi`ere and C. Marignac and J. Jabbori},
doi = {10.1016/j.crte.2005.04.006},
year = {2005},
date = {2005-01-01},
journal = {Comptes Rendus. G\'{e}oscience},
volume = {337},
number = {9},
pages = {872--879},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2004
|
Asrat, A., Barbey, P., Ludden, J., Reisberg, L., Gleizes, G., Ayalew, D. Petrology and isotope geochemistry of the Pan-African Negash Pluton, Northern Ethiopia: mafic-felsic magma interactions during the construction of shallow-level calc-alkaline plutons (Article de journal) Dans: Journal of Petrology, vol. 45, no. 6, p. 1147–1179, 2004. @article{Asrat_etal2004,
title = {Petrology and isotope geochemistry of the Pan-African Negash Pluton, Northern Ethiopia: mafic-felsic magma interactions during the construction of shallow-level calc-alkaline plutons},
author = {A. Asrat and P. Barbey and J. Ludden and L. Reisberg and G. Gleizes and D. Ayalew},
doi = {10.1093/petrology/egh009},
year = {2004},
date = {2004-01-01},
journal = {Journal of Petrology},
volume = {45},
number = {6},
pages = {1147--1179},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barbey, P., Oberli, F., Burg, J. P., Nachit, H., Pons, J., Meier, M. The Paleoproterozoic in western Anti-Atlas (Morocco): a clarification (Article de journal) Dans: Journal of African Earth Sciences, vol. 39, no. 3-5, p. 239–245, 2004. @article{Barbey_etal2004,
title = {The Paleoproterozoic in western Anti-Atlas (Morocco): a clarification},
author = {P. Barbey and F. Oberli and J. P. Burg and H. Nachit and J. Pons and M. Meier},
doi = {10.1016/j.jafrearsci.2004.07.044},
year = {2004},
date = {2004-01-01},
journal = {Journal of African Earth Sciences},
volume = {39},
number = {3-5},
pages = {239--245},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barros, C. E. M., Macambira, M. J. B., Barbey, P., Scheller, T. Dados isotópicos Pb-Pb en zirc~ao (evaporaç~ao) e Sm-Nd do Complexo Granitico Estrela, Provincia Mineral de Carajes, Brasil: implicaç~oes petrológicas e tect^onicas (Article de journal) Dans: Revista Brasileira de Geoci^encias, vol. 34, no. 4, p. 351–358, 2004. @article{Barros_etal2004,
title = {Dados isot\'{o}picos Pb-Pb en zirc~ao (evapora\c{c}~ao) e Sm-Nd do Complexo Granitico Estrela, Provincia Mineral de Carajes, Brasil: implica\c{c}~oes petrol\'{o}gicas e tect^onicas},
author = {C. E. M. Barros and M. J. B. Macambira and P. Barbey and T. Scheller},
year = {2004},
date = {2004-01-01},
journal = {Revista Brasileira de Geoci^encias},
volume = {34},
number = {4},
pages = {351--358},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Laumonier, B., Autran, A., Barbey, P., Cheilletz, A., Baudin, T., Cocherie, A., Guerrot, C. Conséquences de ltextquoterightabsence de socle cadomien sur ltextquoteright^age et la signification des séries pré-varisques (anté-Ordovicien supérieur) du sud de la France (Pyrénées, Montagne Noire) (Article de journal) Dans: Bulletin de la Société géologique de France, vol. 175, no. 6, p. 643–655, 2004. @article{Laumonier_etal2004,
title = {Cons\'{e}quences de ltextquoterightabsence de socle cadomien sur ltextquoteright^age et la signification des s\'{e}ries pr\'{e}-varisques (ant\'{e}-Ordovicien sup\'{e}rieur) du sud de la France (Pyr\'{e}n\'{e}es, Montagne Noire)},
author = {B. Laumonier and A. Autran and P. Barbey and A. Cheilletz and T. Baudin and A. Cocherie and C. Guerrot},
year = {2004},
date = {2004-01-01},
journal = {Bulletin de la Soci\'{e}t\'{e} g\'{e}ologique de France},
volume = {175},
number = {6},
pages = {643--655},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2003
|
Asrat, A., Barbey, P. Petrology, geochronology and Sr-Nd isotopic geochemistry of the Konso Pluton, Southwestern Ethiopia: Implications for transition from convergence to extension in the Pan-African Mozambique Belt (Article de journal) Dans: International Journal of Earth Sciences, vol. 92, p. 873–890, 2003. @article{Asrat+Barbey2003,
title = {Petrology, geochronology and Sr-Nd isotopic geochemistry of the Konso Pluton, Southwestern Ethiopia: Implications for transition from convergence to extension in the Pan-African Mozambique Belt},
author = {A. Asrat and P. Barbey},
doi = {10.1007/s00531-003-0360-9},
year = {2003},
date = {2003-01-01},
journal = {International Journal of Earth Sciences},
volume = {92},
pages = {873--890},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Asrat, A., Gleizes, G., Barbey, P., Ayalew, D. Magma emplacement and mafic-felsic magma hybridization: structural evidence from the Pan-African Negash Pluton, Northern Ethiopia (Article de journal) Dans: Journal of Structural Geology, vol. 25, p. 1451–1469, 2003. @article{Asrat_etal2003,
title = {Magma emplacement and mafic-felsic magma hybridization: structural evidence from the Pan-African Negash Pluton, Northern Ethiopia},
author = {A. Asrat and G. Gleizes and P. Barbey and D. Ayalew},
doi = {10.1016/S0191-8141(02)00182-7},
year = {2003},
date = {2003-01-01},
journal = {Journal of Structural Geology},
volume = {25},
pages = {1451--1469},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ayalew, D., Yirgu, G., Ketefo, E., Barbey, P., Ludden, J. Intrusive equivalents of flood volcanics: evidence from petrology of xenoliths in quaternary Tana basanites (Article de journal) Dans: Ethiopian Journal of Science, vol. 26, p. 93–102, 2003. @article{Ayalew_etal2003,
title = {Intrusive equivalents of flood volcanics: evidence from petrology of xenoliths in quaternary Tana basanites},
author = {D. Ayalew and G. Yirgu and E. Ketefo and P. Barbey and J. Ludden},
year = {2003},
date = {2003-01-01},
journal = {Ethiopian Journal of Science},
volume = {26},
pages = {93--102},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barbey, P., Libourel, G. Les relations de phases et leurs applications. Des sciences de la terre aux matériaux (Ouvrage) CPI, GB Science Publisher, Paris 250 pp, 2003, ISBN: 2-84703-0220. @book{Barbey+Libourel2003,
title = {Les relations de phases et leurs applications. Des sciences de la terre aux mat\'{e}riaux},
author = {P. Barbey and G. Libourel},
isbn = {2-84703-0220},
year = {2003},
date = {2003-01-01},
publisher = {CPI, GB Science Publisher, Paris 250 pp},
keywords = {},
pubstate = {published},
tppubtype = {book}
}
|
Gasquet, D., Barbey, P., Adou, M., Paquette, J. L. Structure, Sr-Nd isotope geochemistry and zircon U-Pb geochronology of the granitoids of the Dabakala area (C^ote dtextquoterightIvoire): evidence for a major 2.3 Ga crustal growth event in the Palaeoproterozoic of West Africa? (Article de journal) Dans: Precambrian Research, vol. 127, no. 4, p. 329–354, 2003. @article{Gasquet_etal2003,
title = {Structure, Sr-Nd isotope geochemistry and zircon U-Pb geochronology of the granitoids of the Dabakala area (C^ote dtextquoterightIvoire): evidence for a major 2.3 Ga crustal growth event in the Palaeoproterozoic of West Africa?},
author = {D. Gasquet and P. Barbey and M. Adou and J. L. Paquette},
doi = {10.1016/S0301-9268(03)00209-2},
year = {2003},
date = {2003-01-01},
journal = {Precambrian Research},
volume = {127},
number = {4},
pages = {329--354},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2002
|
Ayalew, D., Barbey, P., Marty, B., Reisberg, L., Yirgu, G., Pik, R. Source, genesis and timing of giant ignimbrite deposits associated with Ethiopian continental flood basalts (Article de journal) Dans: Geochimica et Cosmochimica Acta, vol. 66, no. 8, p. 1429–1448, 2002. @article{Ayalew_etal2002,
title = {Source, genesis and timing of giant ignimbrite deposits associated with Ethiopian continental flood basalts},
author = {D. Ayalew and P. Barbey and B. Marty and L. Reisberg and G. Yirgu and R. Pik},
doi = {10.1016/S0016-7037(01)00834-1},
year = {2002},
date = {2002-01-01},
journal = {Geochimica et Cosmochimica Acta},
volume = {66},
number = {8},
pages = {1429--1448},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ayalew, D., Barbey, P., Marty, B., Reisberg, L., Yirgu, G., Pik, R. Origin and timing of Ethiopian Ignimbrites (Article de journal) Dans: Geological Journal, vol. 36, p. 409–419, 2002. @article{Ayalew_etal2002_2,
title = {Origin and timing of Ethiopian Ignimbrites},
author = {D. Ayalew and P. Barbey and B. Marty and L. Reisberg and G. Yirgu and R. Pik},
year = {2002},
date = {2002-01-01},
journal = {Geological Journal},
volume = {36},
pages = {409--419},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Branquet, Y., Cheilletz, A., Cobbold, P. R., Barbey, P., Laumonier, B., Giuliani, G. Andean deformation and rift inversion, eastern edge of Cordillera Oriental (Guateque-Medina area), Colombia (Article de journal) Dans: Journal of South American Earth Sciences, vol. 15, p. 391–407, 2002. @article{Branquet_etal2002,
title = {Andean deformation and rift inversion, eastern edge of Cordillera Oriental (Guateque-Medina area), Colombia},
author = {Y. Branquet and A. Cheilletz and P. R. Cobbold and P. Barbey and B. Laumonier and G. Giuliani},
doi = {10.1016/S0895-9811(02)00063-9},
year = {2002},
date = {2002-01-01},
journal = {Journal of South American Earth Sciences},
volume = {15},
pages = {391--407},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Deloule, E., Alexandrov, P., Cheilletz, A., Laumonier, P., Barbey, P. In-situ U-Pb zircon ages for Early Ordovician magmatism in the eastern Pyrenees, France: the Canigou orthogneisses (Article de journal) Dans: International Journal of Earth Sciences, vol. 91, no. 3, p. 398–405, 2002. @article{Deloule_etal2002,
title = {In-situ U-Pb zircon ages for Early Ordovician magmatism in the eastern Pyrenees, France: the Canigou orthogneisses},
author = {E. Deloule and P. Alexandrov and A. Cheilletz and P. Laumonier and P. Barbey},
doi = {10.1007/s00531-001-0232-0},
year = {2002},
date = {2002-01-01},
journal = {International Journal of Earth Sciences},
volume = {91},
number = {3},
pages = {398--405},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2001
|
Asrat, A., Barbey, P., Gleizes, G. The Precambian geology of Ethiopia: a review (Article de journal) Dans: African Geosciences Review, vol. 8, p. 271–288, 2001. @article{Asrat_etal2001,
title = {The Precambian geology of Ethiopia: a review},
author = {A. Asrat and P. Barbey and G. Gleizes},
year = {2001},
date = {2001-01-01},
journal = {African Geosciences Review},
volume = {8},
pages = {271--288},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barbey, P., Cheilletz, A., Laumonier, B. The Canigou orthogneisses (Eastern Pyrenees, France, Spain) : an Early Ordovician rapakivi granite laccolith and its contact aureole (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, série II. Sciences de la Terre et des plan`etes, vol. 332, no. 2, p. 129–136, 2001. @article{Barbey_etal2001,
title = {The Canigou orthogneisses (Eastern Pyrenees, France, Spain) : an Early Ordovician rapakivi granite laccolith and its contact aureole},
author = {P. Barbey and A. Cheilletz and B. Laumonier},
year = {2001},
date = {2001-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, s\'{e}rie II. Sciences de la Terre et des plan`etes},
volume = {332},
number = {2},
pages = {129--136},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barbey, P., Nachit, H., Pons, J. Magma-host interactions during differentiation and emplacement of a shallow-level, zoned granitic pluton (Tarçouate pluton, Morocco) : implications for magma emplacement (Article de journal) Dans: Lithos, vol. 58, no. 3-4, p. 125–143, 2001. @article{Barbey_etal2001_2,
title = {Magma-host interactions during differentiation and emplacement of a shallow-level, zoned granitic pluton (Tar\c{c}ouate pluton, Morocco) : implications for magma emplacement},
author = {P. Barbey and H. Nachit and J. Pons},
doi = {10.1016/S0024-4937(01)00053-6},
year = {2001},
date = {2001-01-01},
journal = {Lithos},
volume = {58},
number = {3-4},
pages = {125--143},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2000
|
Althoff, F., Barbey, P., Boullier, A. M. 2.8-3.0 GA plutonism and deformation in the SE Amazonian craton: the Archaean granitoids of Marajoara (Carajas Mineral Province, Brazil) (Article de journal) Dans: Precambrian Research, vol. 104, no. 3-4, p. 187–206, 2000. @article{Althoff_etal2000,
title = {2.8-3.0 GA plutonism and deformation in the SE Amazonian craton: the Archaean granitoids of Marajoara (Carajas Mineral Province, Brazil)},
author = {F. Althoff and P. Barbey and A. M. Boullier},
doi = {10.1016/S0301-9268(00)00103-0},
year = {2000},
date = {2000-01-01},
journal = {Precambrian Research},
volume = {104},
number = {3-4},
pages = {187--206},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Mortaji, A., Ikenne, M., Gasquet, D., Barbey, P., Stussi, J. M. Les granito"ides paléoprotérozo"iques des boutonni`eres du Bas Dr^aa et de la Tagragra dtextquoterightAkka (Anti-Atlas occidental, Maroc) : un élément du puzzle géodynamique du craton ouest-africain (Article de journal) Dans: Journal of African Earth Sciences, vol. 31, no. 3-4, p. 523–538, 2000. @article{Mortaji_etal2000,
title = {Les granito"ides pal\'{e}oprot\'{e}rozo"iques des boutonni`eres du Bas Dr^aa et de la Tagragra dtextquoterightAkka (Anti-Atlas occidental, Maroc) : un \'{e}l\'{e}ment du puzzle g\'{e}odynamique du craton ouest-africain},
author = {A. Mortaji and M. Ikenne and D. Gasquet and P. Barbey and J. M. Stussi},
doi = {10.1016/S0899-5362(00)80005-6},
year = {2000},
date = {2000-01-01},
journal = {Journal of African Earth Sciences},
volume = {31},
number = {3-4},
pages = {523--538},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ngnotue, T., Nzenti, J. -P., Barbey, P., Tchoua, F. -M. The Ntui-Betamba high-grade gneisses: a Northward extension of the Pan-African Yaoundé gneisses in Cameroon (Article de journal) Dans: Journal of African Earth Sciences, vol. 31, p. 369–381, 2000. @article{Ngnotue_etal2000,
title = {The Ntui-Betamba high-grade gneisses: a Northward extension of the Pan-African Yaound\'{e} gneisses in Cameroon},
author = {T. Ngnotue and J. -P. Nzenti and P. Barbey and F. -M. Tchoua},
doi = {10.1016/S0899-5362(00)00094-4},
year = {2000},
date = {2000-01-01},
journal = {Journal of African Earth Sciences},
volume = {31},
pages = {369--381},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1999
|
Barbey, P., Marignac, C., Montel, J. M., Macaudi`ere, J., Gasquet, D., Jabbori, J. Cordierite growth textures and the conditions of genesis and emplacement of crustal granitic magmas : the Valey Granite complex ( Massif Central, France) (Article de journal) Dans: Journal of Petrology, vol. 40, no. 9, p. 1425–1441, 1999. @article{Barbey_etal1999,
title = {Cordierite growth textures and the conditions of genesis and emplacement of crustal granitic magmas : the Valey Granite complex ( Massif Central, France)},
author = {P. Barbey and C. Marignac and J. M. Montel and J. Macaudi`ere and D. Gasquet and J. Jabbori},
doi = {10.1093/petrology/40.9.1425},
year = {1999},
date = {1999-01-01},
journal = {Journal of Petrology},
volume = {40},
number = {9},
pages = {1425--1441},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1998
|
Barros, C. E., Barbey, P. A import^ancia da granitog^enese tardi-arqueana (2.5 Ga) na evoluç~ao tectono-metamórfica da província mineral de Carajás ?Ĭ O complexo granítico Estrela e sua auréola de contato (Article de journal) Dans: Revista Brasileira de Geoci^encias, vol. 28, p. 513–522, 1998. @article{Barros+Barbey1998,
title = {A import^ancia da granitog^enese tardi-arqueana (2.5 Ga) na evolu\c{c}~ao tectono-metam\'{o}rfica da prov\'{i}ncia mineral de Caraj\'{a}s ?\u{I} O complexo gran\'{i}tico Estrela e sua aur\'{e}ola de contato},
author = {C. E. Barros and P. Barbey},
year = {1998},
date = {1998-01-01},
journal = {Revista Brasileira de Geoci^encias},
volume = {28},
pages = {513--522},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1997
|
de Mesquita, C. E. Barros, DalltextquoterightAgnol, R., Barbey, P., Boullier, A. M. Geochemistry of the Estrela Granite Complex, Carajás region, Brazil : an example of an Archean A-type granitoid (Article de journal) Dans: Journal of South American Earth Sciences, vol. 10, p. 321–330, 1997. @article{BarrosdeMesquita_etal1997,
title = {Geochemistry of the Estrela Granite Complex, Caraj\'{a}s region, Brazil : an example of an Archean A-type granitoid},
author = {C. E. Barros de Mesquita and R. DalltextquoterightAgnol and P. Barbey and A. M. Boullier},
year = {1997},
date = {1997-01-01},
journal = {Journal of South American Earth Sciences},
volume = {10},
pages = {321--330},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ikenne, M., Gasquet, D., Barbey, P., Macaudi`ere, J. Relations entre déformation, métamorphisme et magmatisme dans le Paléoprotérozoique du massif du Bas-Dr^a (Anti-atlas occidental, Maroc) (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, série II, vol. 324, p. 237–243, 1997. @article{Ikenne_etal1997,
title = {Relations entre d\'{e}formation, m\'{e}tamorphisme et magmatisme dans le Pal\'{e}oprot\'{e}rozoique du massif du Bas-Dr^a (Anti-atlas occidental, Maroc)},
author = {M. Ikenne and D. Gasquet and P. Barbey and J. Macaudi`ere},
year = {1997},
date = {1997-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, s\'{e}rie II},
volume = {324},
pages = {237--243},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1996
|
Barbey, P., Brouand, M., Fort, P. Le, P^echer, A. Granite-migmatite genetic link : the example of the Manalu granite and Tibetan Slab migmatites in central Nepal (Article de journal) Dans: Lithos, vol. 38, p. 63–79, 1996. @article{Barbey_etal1996,
title = {Granite-migmatite genetic link : the example of the Manalu granite and Tibetan Slab migmatites in central Nepal},
author = {P. Barbey and M. Brouand and P. Le Fort and A. P^echer},
year = {1996},
date = {1996-01-01},
journal = {Lithos},
volume = {38},
pages = {63--79},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Fougnot, J., Pichavant, M., Barbey, P. Biotite resorption in dacite lavas from northeastern Algeria (Article de journal) Dans: European Journal of Mineralogy, vol. 8, p. 625–638, 1996. @article{Fougnot_etal1996,
title = {Biotite resorption in dacite lavas from northeastern Algeria},
author = {J. Fougnot and M. Pichavant and P. Barbey},
year = {1996},
date = {1996-01-01},
journal = {European Journal of Mineralogy},
volume = {8},
pages = {625--638},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Nachit, H., Barbey, P., Pons, J., Burg, J. P. LtextquoterightEburnéen existe-t-il dans ltextquoterightanti-atlas occidental marocain ?: Ltextquoterightexemple du massif du Kerdous (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, série II, vol. 322, p. 677–683, 1996. @article{Nachit_etal1996,
title = {LtextquoterightEburn\'{e}en existe-t-il dans ltextquoterightanti-atlas occidental marocain ?: Ltextquoterightexemple du massif du Kerdous},
author = {H. Nachit and P. Barbey and J. Pons and J. P. Burg},
year = {1996},
date = {1996-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, s\'{e}rie II},
volume = {322},
pages = {677--683},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Vigneresse, J. L., Barbey, P., Cuney, M. Rheological transitions during partial melting and crystallization with application to felsic magma segregation and transfer (Article de journal) Dans: Journal of Petrology, vol. 37, p. 1579–1600, 1996. @article{Vigneresse_etal1996,
title = {Rheological transitions during partial melting and crystallization with application to felsic magma segregation and transfer},
author = {J. L. Vigneresse and P. Barbey and M. Cuney},
year = {1996},
date = {1996-01-01},
journal = {Journal of Petrology},
volume = {37},
pages = {1579--1600},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1995
|
Barbey, P., Allé, P., Brouand, M., Albar`ede, F. Rare-earth patterns in zircons from the Manaslu granite and Tibetan slab migmatites (Himalaya) : insights in the origin and evolution of a crustally-derived granite magma (Article de journal) Dans: Chemical Geology, vol. 125, p. 1–17, 1995. @article{Barbey_etal1995,
title = {Rare-earth patterns in zircons from the Manaslu granite and Tibetan slab migmatites (Himalaya) : insights in the origin and evolution of a crustally-derived granite magma},
author = {P. Barbey and P. All\'{e} and M. Brouand and F. Albar`ede},
year = {1995},
date = {1995-01-01},
journal = {Chemical Geology},
volume = {125},
pages = {1--17},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Hammouda, T., Pichavant, M., Barbey, P., Brearley, A. J. Synthesis of fluorphlogopite single crystals. Applications to experimental studies (Article de journal) Dans: European Journal of Mineralogy, vol. 7, p. 1381–1387, 1995. @article{Hammouda_etal1995,
title = {Synthesis of fluorphlogopite single crystals. Applications to experimental studies},
author = {T. Hammouda and M. Pichavant and P. Barbey and A. J. Brearley},
year = {1995},
date = {1995-01-01},
journal = {European Journal of Mineralogy},
volume = {7},
pages = {1381--1387},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1994
|
Althoff, F., Barbey, P., Pons, J. La charnockite dtextquoterightAnsignan et le granite de Saint-Arnac, témoins dtextquoterightune extension crustale dtextquoteright^age hercynien dans le massif de ltextquoterightAgly (Pyrénées-Orientales, France) (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, série II, vol. 319, p. 239–246, 1994. @article{Althoff_etal1994,
title = {La charnockite dtextquoterightAnsignan et le granite de Saint-Arnac, t\'{e}moins dtextquoterightune extension crustale dtextquoteright^age hercynien dans le massif de ltextquoterightAgly (Pyr\'{e}n\'{e}es-Orientales, France)},
author = {F. Althoff and P. Barbey and J. Pons},
year = {1994},
date = {1994-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, s\'{e}rie II},
volume = {319},
pages = {239--246},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Bertrand, J. M., Barbey, P., Latouche, L., Macaudi`ere, J. Le socle précambrien du Cameroun, une revue partielle des travaux récents (Article de journal) Dans: Pangea. Conférence spécialisée du Centre International pour la Formation et les Echanges Géologiques (CIFEG), vol. 21, p. 33–41, 1994. @article{Bertrand_etal1994,
title = {Le socle pr\'{e}cambrien du Cameroun, une revue partielle des travaux r\'{e}cents},
author = {J. M. Bertrand and P. Barbey and L. Latouche and J. Macaudi`ere},
year = {1994},
date = {1994-01-01},
journal = {Pangea. Conf\'{e}rence sp\'{e}cialis\'{e}e du Centre International pour la Formation et les Echanges G\'{e}ologiques (CIFEG)},
volume = {21},
pages = {33--41},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Cheilletz, A., Barbey, P., Lama, C., Pons, J., Zimmermann, J. L., Dautel, D. Age de refroidissement de la cro^ute juvénile birimienne dtextquoterightAfrique de ltextquoterightOuest. Données U-Pb, Rb-Sr et K-Ar sur les formations `a 2,1 Ga du SW-Niger (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences série II, vol. 319, p. 435–442, 1994. @article{Cheilletz_etal1994,
title = {Age de refroidissement de la cro^ute juv\'{e}nile birimienne dtextquoterightAfrique de ltextquoterightOuest. Donn\'{e}es U-Pb, Rb-Sr et K-Ar sur les formations `a 2,1 Ga du SW-Niger},
author = {A. Cheilletz and P. Barbey and C. Lama and J. Pons and J. L. Zimmermann and D. Dautel},
year = {1994},
date = {1994-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences s\'{e}rie II},
volume = {319},
pages = {435--442},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Libourel, G., Barbey, P., Chaussidon, M. Ltextquoterightaltération des vitraux (Article de journal) Dans: La Recherche, no. 262, p. 168–188, 1994. @article{Libourel_etal1994,
title = {Ltextquoterightalt\'{e}ration des vitraux},
author = {G. Libourel and P. Barbey and M. Chaussidon},
year = {1994},
date = {1994-01-01},
journal = {La Recherche},
number = {262},
pages = {168--188},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1993
|
Nédélec, A., Minyem, D., Barbey, P. High-P-high-T anatexis of Archean tonalitic grey gneisses : the Eseka migmatites, Cameroon (Article de journal) Dans: Precambrian Research, vol. 62, p. 191–205, 1993. @article{Ndlec_etal1993,
title = {High-P-high-T anatexis of Archean tonalitic grey gneisses : the Eseka migmatites, Cameroon},
author = {A. N\'{e}d\'{e}lec and D. Minyem and P. Barbey},
year = {1993},
date = {1993-01-01},
journal = {Precambrian Research},
volume = {62},
pages = {191--205},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1992
|
Holtz, F., Pichavant, M., Barbey, P., Johannes, W. Effects of H2O on liquidus phase relations in the haplogranite system at 2 and 5 kbar (Article de journal) Dans: American Mineralogist, vol. 77, p. 1223–1241, 1992. @article{Holtz_etal1992,
title = {Effects of H2O on liquidus phase relations in the haplogranite system at 2 and 5 kbar},
author = {F. Holtz and M. Pichavant and P. Barbey and W. Johannes},
year = {1992},
date = {1992-01-01},
journal = {American Mineralogist},
volume = {77},
pages = {1223--1241},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Macaudi`ere, J., Barbey, P., Jabbori, J., Marignac, C. Le stade initial de fusion dans le développement des d^omes anatectiques : le d^ome du Velay (Massif Central français) (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, série II, vol. 315, p. 1761–1767, 1992. @article{Macaudire_etal1992,
title = {Le stade initial de fusion dans le d\'{e}veloppement des d^omes anatectiques : le d^ome du Velay (Massif Central fran\c{c}ais)},
author = {J. Macaudi`ere and P. Barbey and J. Jabbori and C. Marignac},
year = {1992},
date = {1992-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, s\'{e}rie II},
volume = {315},
pages = {1761--1767},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Montel, J. M., Marignac, C., Barbey, P., Pichavant, M. Thermobarometry and granite genesis : the Hercynian low-P high-T Velay anatectic dome (French Massif Central) (Article de journal) Dans: Journal of Metamorphic Geology, vol. 10, p. 1–15, 1992. @article{Montel_etal1992,
title = {Thermobarometry and granite genesis : the Hercynian low-P high-T Velay anatectic dome (French Massif Central)},
author = {J. M. Montel and C. Marignac and P. Barbey and M. Pichavant},
year = {1992},
date = {1992-01-01},
journal = {Journal of Metamorphic Geology},
volume = {10},
pages = {1--15},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1991
|
Holtz, F., Barbey, P. Genesis of peraluminous granites II. Mineralogy and chemistry of the Tourem Complex (North Portugal). Sequential melting vs. restite unmixing (Article de journal) Dans: Journal of Petrology, vol. 32, p. 959–978, 1991. @article{Holtz+Barbey1991,
title = {Genesis of peraluminous granites II. Mineralogy and chemistry of the Tourem Complex (North Portugal). Sequential melting vs. restite unmixing},
author = {F. Holtz and P. Barbey},
year = {1991},
date = {1991-01-01},
journal = {Journal of Petrology},
volume = {32},
pages = {959--978},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1990
|
Barbey, P., Macaudi`ere, J., Nzenti, J. P. High-pressure dehydration melting of metapelites : evidence from the migmatites of Yaoundé (Cameroon) (Article de journal) Dans: Journal of Petrology, vol. 31, p. 401–427, 1990. @article{Barbey_etal1990,
title = {High-pressure dehydration melting of metapelites : evidence from the migmatites of Yaound\'{e} (Cameroon)},
author = {P. Barbey and J. Macaudi`ere and J. P. Nzenti},
year = {1990},
date = {1990-01-01},
journal = {Journal of Petrology},
volume = {31},
pages = {401--427},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barbey, P., Raith, M. Granulites and crustal differentiation (Chapitre d'ouvrage) Dans: Vielzeuf, D.; Vidal, P. (Ed.): Chapitre The granulite belt of Lapland, p. 111–132, Kluwer Academic, 1990. @inbook{Barbey+Raith1990,
title = {Granulites and crustal differentiation},
author = {P. Barbey and M. Raith},
editor = {D. Vielzeuf and P. Vidal},
year = {1990},
date = {1990-01-01},
pages = {111--132},
publisher = {Kluwer Academic},
chapter = {The granulite belt of Lapland},
series = {NATO-ASI series},
keywords = {},
pubstate = {published},
tppubtype = {inbook}
}
|
Brouand, M., Banzet, G., Barbey, P. Zircon behaviour during crustal anatexis. Evidence from the Tibetan Slab migmatites (Nepal) (Article de journal) Dans: Journal of volcanology and geothermal research, vol. 44, p. 143–161, 1990. @article{Brouand_etal1990,
title = {Zircon behaviour during crustal anatexis. Evidence from the Tibetan Slab migmatites (Nepal)},
author = {M. Brouand and G. Banzet and P. Barbey},
year = {1990},
date = {1990-01-01},
journal = {Journal of volcanology and geothermal research},
volume = {44},
pages = {143--161},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1989
|
Barbey, P., Bertrand, J. M., Angoua, S., Dautel, D. Petrology and U/Pb geochronology of the Telohat migmatites, Aleksod, Central Hoggar, Algeria (Article de journal) Dans: Contributions to Mineralogy and Petrology, vol. 101, p. 207–219, 1989. @article{Barbey_etal1989,
title = {Petrology and U/Pb geochronology of the Telohat migmatites, Aleksod, Central Hoggar, Algeria},
author = {P. Barbey and J. M. Bertrand and S. Angoua and D. Dautel},
year = {1989},
date = {1989-01-01},
journal = {Contributions to Mineralogy and Petrology},
volume = {101},
pages = {207--219},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1988
|
Boullier, A. M., Barbey, P. A polycyclic two-stage corona growth in the Iforas granulitic Unit (Article de journal) Dans: Journal of Metamorphic Geology, vol. 6, p. 235–254, 1988. @article{Boullier+Barbey1988,
title = {A polycyclic two-stage corona growth in the Iforas granulitic Unit},
author = {A. M. Boullier and P. Barbey},
year = {1988},
date = {1988-01-01},
journal = {Journal of Metamorphic Geology},
volume = {6},
pages = {235--254},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Martin, H., Barbey, P. Zircon U-Pb versus Rb-Sr whole rock age data from Eastern Finland (Article de journal) Dans: Precambrian Research, vol. 39, p. 221–226, 1988. @article{Martin+Barbey1988,
title = {Zircon U-Pb versus Rb-Sr whole rock age data from Eastern Finland},
author = {H. Martin and P. Barbey},
year = {1988},
date = {1988-01-01},
journal = {Precambrian Research},
volume = {39},
pages = {221--226},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Nzenti, J. P., Barbey, P., Macaudi`ere, J., Soba, D. Origin and evolution of the late Precambrian high-grade Yaoundé gneisses (Article de journal) Dans: Precambrian Research, vol. 38, p. 91–109, 1988. @article{Nzenti_etal1988,
title = {Origin and evolution of the late Precambrian high-grade Yaound\'{e} gneisses},
author = {J. P. Nzenti and P. Barbey and J. Macaudi`ere and D. Soba},
year = {1988},
date = {1988-01-01},
journal = {Precambrian Research},
volume = {38},
pages = {91--109},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1987
|
Barbey, P., Cuney, M. Modalités de la fusion partielle dans les orthogneiss de St Alyre (Cézallier, Massif Central français) (Article de journal) Dans: Géologie de la France, vol. 4, p. 45–50, 1987. @article{Barbey+Cuney1987,
title = {Modalit\'{e}s de la fusion partielle dans les orthogneiss de St Alyre (C\'{e}zallier, Massif Central fran\c{c}ais)},
author = {P. Barbey and M. Cuney},
year = {1987},
date = {1987-01-01},
journal = {G\'{e}ologie de la France},
volume = {4},
pages = {45--50},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barbey, P., Martin, H. The role of komatiites in plate tectonics. Evidence from the Archaean and early Proterozoic crust in the Eastern baltic shield (Article de journal) Dans: Precambrian Research, vol. 35, p. 1–14, 1987. @article{Barbey+Martin1987,
title = {The role of komatiites in plate tectonics. Evidence from the Archaean and early Proterozoic crust in the Eastern baltic shield},
author = {P. Barbey and H. Martin},
doi = {10.1016/0301-9268(87)90043-X},
year = {1987},
date = {1987-01-01},
journal = {Precambrian Research},
volume = {35},
pages = {1--14},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1986
|
Barbey, P., Bernard-Griffiths, J., Convert, J. The Lapland charnockitic complex : REE geochemistry and petrogenesis (Article de journal) Dans: Lithos, vol. 19, p. 95–111, 1986. @article{Barbey_etal1986,
title = {The Lapland charnockitic complex : REE geochemistry and petrogenesis},
author = {P. Barbey and J. Bernard-Griffiths and J. Convert},
doi = {10.1016/0024-4937(86)90002-2},
year = {1986},
date = {1986-01-01},
journal = {Lithos},
volume = {19},
pages = {95--111},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Champenois, M., Boullier, A. M., Sautter, V., Wright, L. I., Barbey, P. Tectonometamorphic evolution of the gneissic Kidal assemblage related to the Pan-African thrust tectonics (Adrar des Iforas, Mali) (Article de journal) Dans: Journal of African Earth Sciences, vol. 6, no. 1, p. 19–27, 1986. @article{Champenois_etal1986,
title = {Tectonometamorphic evolution of the gneissic Kidal assemblage related to the Pan-African thrust tectonics (Adrar des Iforas, Mali)},
author = {M. Champenois and A. M. Boullier and V. Sautter and L. I. Wright and P. Barbey},
year = {1986},
date = {1986-01-01},
journal = {Journal of African Earth Sciences},
volume = {6},
number = {1},
pages = {19--27},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Montel, J. M., Weber, C., Barbey, P., Pichavant, M. Thermo-barométrie du domaine anatectique du Velay (Massif Central, France) et conditions de gen`ese des granites tardi-migmatitiques (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, série II, vol. 302, p. 647–652, 1986. @article{Montel_etal1986,
title = {Thermo-barom\'{e}trie du domaine anatectique du Velay (Massif Central, France) et conditions de gen`ese des granites tardi-migmatitiques},
author = {J. M. Montel and C. Weber and P. Barbey and M. Pichavant},
year = {1986},
date = {1986-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, s\'{e}rie II},
volume = {302},
pages = {647--652},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Nédélec, A., Nzenti, J. P., Macaudi`ere, J., Barbey, P. Evolution structurale et métamorphique des schistes de Mbalmayo (Cameroun). Implications pour la structure de la zone mobile pan-africaine dtextquoterightAfrique centrale, au contact du craton du Congo (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, série II, vol. 303, p. 75–80, 1986. @article{Ndlec_etal1986,
title = {Evolution structurale et m\'{e}tamorphique des schistes de Mbalmayo (Cameroun). Implications pour la structure de la zone mobile pan-africaine dtextquoterightAfrique centrale, au contact du craton du Congo},
author = {A. N\'{e}d\'{e}lec and J. P. Nzenti and J. Macaudi`ere and P. Barbey},
year = {1986},
date = {1986-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, s\'{e}rie II},
volume = {303},
pages = {75--80},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Weber, C., Barbey, P. The role of water, mixing processes and metamorphic fabric in the genesis of the Baume migmatites (Ard`eche, France) (Article de journal) Dans: Contributions to Mineralogy and Petrology, vol. 92, p. 481–491, 1986. @article{Weber+Barbey1986,
title = {The role of water, mixing processes and metamorphic fabric in the genesis of the Baume migmatites (Ard`eche, France)},
author = {C. Weber and P. Barbey},
year = {1986},
date = {1986-01-01},
journal = {Contributions to Mineralogy and Petrology},
volume = {92},
pages = {481--491},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1985
|
Weber, C., Barbey, P. Gen`ese de spinelles zincif`eres `a partir dtextquoterightorthogneiss granitiques dans les conditions du début de ltextquoterightanatexie. Exemple des migmatites de la Baume (Ard`eche, France) (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, série II, vol. 300, p. 349–354, 1985. @article{Weber+Barbey1985,
title = {Gen`ese de spinelles zincif`eres `a partir dtextquoterightorthogneiss granitiques dans les conditions du d\'{e}but de ltextquoterightanatexie. Exemple des migmatites de la Baume (Ard`eche, France)},
author = {C. Weber and P. Barbey},
year = {1985},
date = {1985-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, s\'{e}rie II},
volume = {300},
pages = {349--354},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Weber, C., Barbey, P., Cuney, M., Martin, H. Trace element behaviour during migmatization. Evidence for a complex melt-residuum-fluid interaction in the St Malo migmatitic dome (France) (Article de journal) Dans: Contributions to Mineralogy and Petrology, vol. 90, p. 52–62, 1985. @article{Weber_etal1985,
title = {Trace element behaviour during migmatization. Evidence for a complex melt-residuum-fluid interaction in the St Malo migmatitic dome (France)},
author = {C. Weber and P. Barbey and M. Cuney and H. Martin},
year = {1985},
date = {1985-01-01},
journal = {Contributions to Mineralogy and Petrology},
volume = {90},
pages = {52--62},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Weber, C., Pichavant, M., Barbey, P. La cordiérite dans le domaine anatectique du Velay (Massif Central français) : un marqueur de ltextquoterightanatexie, du magmatisme et de ltextquoterighthydrothermalisme (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, série II, vol. 301, p. 303–308, 1985. @article{Weber_etal1985_2,
title = {La cordi\'{e}rite dans le domaine anatectique du Velay (Massif Central fran\c{c}ais) : un marqueur de ltextquoterightanatexie, du magmatisme et de ltextquoterighthydrothermalisme},
author = {C. Weber and M. Pichavant and P. Barbey},
year = {1985},
date = {1985-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, s\'{e}rie II},
volume = {301},
pages = {303--308},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1984
|
Barbey, P., Convert, J., Moreau, B., Capdevila, R., Hameurt, J. Petrogenesis and evolution of an early Proterozoic collisional orogenic belt : the granulite belt of Lapland and the Belomorides (Fennoscandia) (Article de journal) Dans: Bulletin of the Geological Society of Finland, vol. 56, p. 161–188, 1984. @article{Barbey_etal1984,
title = {Petrogenesis and evolution of an early Proterozoic collisional orogenic belt : the granulite belt of Lapland and the Belomorides (Fennoscandia)},
author = {P. Barbey and J. Convert and B. Moreau and R. Capdevila and J. Hameurt},
year = {1984},
date = {1984-01-01},
journal = {Bulletin of the Geological Society of Finland},
volume = {56},
pages = {161--188},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Nzenti, J. P., Barbey, P., Jegouzo, P., Moreau, C. Un nouvel exemple de ceinture granulitique dans une cha^ine protérozoique de collisison : les migmatites de Yaoundé au Cameroun (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, série II, vol. 299, p. 1197–1199, 1984. @article{Nzenti_etal1984,
title = {Un nouvel exemple de ceinture granulitique dans une cha^ine prot\'{e}rozoique de collisison : les migmatites de Yaound\'{e} au Cameroun},
author = {J. P. Nzenti and P. Barbey and P. Jegouzo and C. Moreau},
year = {1984},
date = {1984-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, s\'{e}rie II},
volume = {299},
pages = {1197--1199},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1982
|
Barbey, P., Capdevila, R., Hameurt, J. Major and transition trace element abundances in the khondalite suite of the granulite belt of Lapland (Fennoscandia) : evidence for an early Proterozoic flysch-belt (Article de journal) Dans: Precambrian Research, vol. 16, p. 273–290, 1982. @article{Barbey_etal1982,
title = {Major and transition trace element abundances in the khondalite suite of the granulite belt of Lapland (Fennoscandia) : evidence for an early Proterozoic flysch-belt},
author = {P. Barbey and R. Capdevila and J. Hameurt},
doi = {10.1016/0301-9268(82)90064-X},
year = {1982},
date = {1982-01-01},
journal = {Precambrian Research},
volume = {16},
pages = {273--290},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barbey, P., Cuney, M. K, Rb, Sr, Ba, U and Th geochemistry of the Lapland granulites (Fenno-scandia). LILE fractionation controlling factors (Article de journal) Dans: Contributions to Mineralogy and Petrology, vol. 81, p. 304–316, 1982. @article{Barbey+Cuney1982,
title = {K, Rb, Sr, Ba, U and Th geochemistry of the Lapland granulites (Fenno-scandia). LILE fractionation controlling factors},
author = {P. Barbey and M. Cuney},
year = {1982},
date = {1982-01-01},
journal = {Contributions to Mineralogy and Petrology},
volume = {81},
pages = {304--316},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Barbey, P., Touret, L., Capdevila, R., Hameurt, J. Mise en évidence de deux séries paléo-volcaniques dans la ceinture protérozoique de la Tana. Conséquences sur ltextquoterightenvironnement géotectonique de la ceinture des granulites de Laponie (Fennoscandie) (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, série II, vol. 292, p. 207–210, 1982. @article{Barbey_etal1982_2,
title = {Mise en \'{e}vidence de deux s\'{e}ries pal\'{e}o-volcaniques dans la ceinture prot\'{e}rozoique de la Tana. Cons\'{e}quences sur ltextquoterightenvironnement g\'{e}otectonique de la ceinture des granulites de Laponie (Fennoscandie)},
author = {P. Barbey and L. Touret and R. Capdevila and J. Hameurt},
year = {1982},
date = {1982-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, s\'{e}rie II},
volume = {292},
pages = {207--210},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Cuney, M., Barbey, P. Mise en évidence de phénom`enes de cristallisation fractionnée dans les migmatites (Article de journal) Dans: Comptes Rendus de ltextquoterightAcadémie des Sciences, Série II, vol. 295, p. 37–42, 1982. @article{Cuney+Barbey1982,
title = {Mise en \'{e}vidence de ph\'{e}nom`enes de cristallisation fractionn\'{e}e dans les migmatites},
author = {M. Cuney and P. Barbey},
year = {1982},
date = {1982-01-01},
journal = {Comptes Rendus de ltextquoterightAcad\'{e}mie des Sciences, S\'{e}rie II},
volume = {295},
pages = {37--42},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
