2022
|
Borisova, A. Y., Nédélec, A., Zagrtdenov, N. R., Toplis, M. J., Bohrson, W. A., Safonov, O. G., Bindeman, I. N., Melnik, O. E., Pokrovski, G. S., Ceuleneer, G., Jochum, K. P., Stoll, B., Weis, U., Bychikov, A. Y., Gurenko, A. A. Hadean zircon formed due to hydrated ultramafic protocrust melting (Article de journal) Dans: Geology, vol. 50, no. 3, p. 300–304, 2022. @article{Borisova_etal2022,
title = {Hadean zircon formed due to hydrated ultramafic protocrust melting},
author = {A. Y. Borisova and A. N\'{e}d\'{e}lec and N. R. Zagrtdenov and M. J. Toplis and W. A. Bohrson and O. G. Safonov and I. N. Bindeman and O. E. Melnik and G. S. Pokrovski and G. Ceuleneer and K. P. Jochum and B. Stoll and U. Weis and A. Y. Bychikov and A. A. Gurenko},
doi = {10.1130/G49354.1},
year = {2022},
date = {2022-01-01},
journal = {Geology},
volume = {50},
number = {3},
pages = {300--304},
abstract = {Hadean zircons, from the Jack Hills (Western Australia) and other localities, are currently the only window into the earliest terrestrial felsic crust, the formation of which remains enigmatic. Based upon new experimental results, generation of such early crust has been hypothesized to involve the partial melting of hydrated peridotite interacting with basaltic melt at low pressure (\<10 km), but it has yet to be demonstrated that such liquids can indeed crystallize zircons comparable to Jack Hills zircon. We used thermodynamic and geochemical modeling to test this hypothesis. The predicted zircon saturation temperatures of \<750 textdegreeC, together with the model zircon Th, U, Nb, Hf, Y, and rare earth element (REE) contents at 700 textdegreeC, $delta$18OVSMOW (Vienna standard mean ocean water) signatures, and co-crystallizing mineral assemblage were compared to those of the Jack Hills zircon. This comparison was favorable with respect to crystallization temperature, most trace-element contents, and mineral inclusions in zircon. The discrepancy in $delta$18OVSMOW signatures may be explained by hotter conditions of Hadean protocrust hydration. Our work supports the idea that felsic magma generation at shallow depths involving a primordial weathered ultramafic protocrust and local basaltic intrusions is indeed a viable mechanism for the formation of felsic crust on early Earth.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hadean zircons, from the Jack Hills (Western Australia) and other localities, are currently the only window into the earliest terrestrial felsic crust, the formation of which remains enigmatic. Based upon new experimental results, generation of such early crust has been hypothesized to involve the partial melting of hydrated peridotite interacting with basaltic melt at low pressure (<10 km), but it has yet to be demonstrated that such liquids can indeed crystallize zircons comparable to Jack Hills zircon. We used thermodynamic and geochemical modeling to test this hypothesis. The predicted zircon saturation temperatures of <750 textdegreeC, together with the model zircon Th, U, Nb, Hf, Y, and rare earth element (REE) contents at 700 textdegreeC, $delta$18OVSMOW (Vienna standard mean ocean water) signatures, and co-crystallizing mineral assemblage were compared to those of the Jack Hills zircon. This comparison was favorable with respect to crystallization temperature, most trace-element contents, and mineral inclusions in zircon. The discrepancy in $delta$18OVSMOW signatures may be explained by hotter conditions of Hadean protocrust hydration. Our work supports the idea that felsic magma generation at shallow depths involving a primordial weathered ultramafic protocrust and local basaltic intrusions is indeed a viable mechanism for the formation of felsic crust on early Earth. |
2021
|
Gurenko, A. A. Origin of sulphur in relation to silicate-sulphide immiscibility in Tolbachik primitive arc magma (Kamchatka, Russia): Insights from sulphur and boron isoto (Article de journal) Dans: Chemical Geology, vol. 576, p. 120244, 2021. @article{Gurenko2021,
title = {Origin of sulphur in relation to silicate-sulphide immiscibility in Tolbachik primitive arc magma (Kamchatka, Russia): Insights from sulphur and boron isoto},
author = {A. A. Gurenko},
doi = {10.1016/j.chemgeo.2021.120244},
year = {2021},
date = {2021-01-01},
journal = {Chemical Geology},
volume = {576},
pages = {120244},
abstract = {This study reports the first measurements of sulphur and boron isotopic compositions in olivine-hosted melt inclusions (MI) from basaltic lava and scoria deposits from the 1941 Tolbachik eruption, Kamchatka, Russia. The primary aim of the present study is to constrain the origin of sulphur in relation to silicate-sulphide immiscibility that occurred in the Tolbachik mafic magmas. Melt inclusions fall into two compositionally distinct groups based on their S- and B-isotope systematics, the first is hosted by olivine from lava and the second in olivine from lapilli and scoria. The upper ends of the concentration ranges for CO2 (3660--4200 $mu$g/g) and H2O (4.5--5.9 wt%) imply the onset of magma crystallization between textasciitilde25 and textasciitilde30 km for both MI groups, i.e., close to the Moho discontinuity. After filtering the compositions of melt inclusions experienced H2O-loss due to the diffusion of H from olivine hosts, both lava- and scoria-related melt inclusions are characterized by similar fractionation depths between textasciitilde15 and textasciitilde30 km. The inclusions from scoria show no signs of sulphur degassing at depth and, along with the most S-rich inclusions from lava, exhibit enrichment in S. Strong positive correlations of S/K2O with H2O/K2O, Cl/K2O and F/K2O, as well as the correlations of these ratios with $delta$34S also preclude significant S-loss by degassing and point towards mixing of at least two magmas containing contrasting volatile concentrations and isotopic compositions. Slab-derived 11B-enriched fluids and, to a minor extent, 11B-depleted melts could be major agents controlling the composition of the mantle wedge and, consequently, the chemical and isotopic variability of its derivative melts. A subducted serpentinized peridotite could serve as a possible source of the 11B- and probably the 34S-rich signature of the studied primitive Tolbachik magmas.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This study reports the first measurements of sulphur and boron isotopic compositions in olivine-hosted melt inclusions (MI) from basaltic lava and scoria deposits from the 1941 Tolbachik eruption, Kamchatka, Russia. The primary aim of the present study is to constrain the origin of sulphur in relation to silicate-sulphide immiscibility that occurred in the Tolbachik mafic magmas. Melt inclusions fall into two compositionally distinct groups based on their S- and B-isotope systematics, the first is hosted by olivine from lava and the second in olivine from lapilli and scoria. The upper ends of the concentration ranges for CO2 (3660--4200 $mu$g/g) and H2O (4.5--5.9 wt%) imply the onset of magma crystallization between textasciitilde25 and textasciitilde30 km for both MI groups, i.e., close to the Moho discontinuity. After filtering the compositions of melt inclusions experienced H2O-loss due to the diffusion of H from olivine hosts, both lava- and scoria-related melt inclusions are characterized by similar fractionation depths between textasciitilde15 and textasciitilde30 km. The inclusions from scoria show no signs of sulphur degassing at depth and, along with the most S-rich inclusions from lava, exhibit enrichment in S. Strong positive correlations of S/K2O with H2O/K2O, Cl/K2O and F/K2O, as well as the correlations of these ratios with $delta$34S also preclude significant S-loss by degassing and point towards mixing of at least two magmas containing contrasting volatile concentrations and isotopic compositions. Slab-derived 11B-enriched fluids and, to a minor extent, 11B-depleted melts could be major agents controlling the composition of the mantle wedge and, consequently, the chemical and isotopic variability of its derivative melts. A subducted serpentinized peridotite could serve as a possible source of the 11B- and probably the 34S-rich signature of the studied primitive Tolbachik magmas. |
2019
|
Sobolev, A. V., Asafov, E. V., Gurenko, A. A., Arndt, N. T., Batanova, V. G., Portnyagin, M. V., Garbe-Schönberg, D., Wilson, A. H., Byerly, G. R. Deep hydrous mantle reservoir provides evidence for crustal recycling before 3.3 billion years ago (Article de journal) Dans: Nature, vol. 571, 2019. @article{Sobolev_etal2019,
title = {Deep hydrous mantle reservoir provides evidence for crustal recycling before 3.3 billion years ago},
author = {A. V. Sobolev and E. V. Asafov and A. A. Gurenko and N. T. Arndt and V. G. Batanova and M. V. Portnyagin and D. Garbe-Sch\"{o}nberg and A. H. Wilson and G. R. Byerly},
doi = {10.1038/s41586-019-1399-5},
year = {2019},
date = {2019-01-01},
journal = {Nature},
volume = {571},
abstract = {Water strongly influences the physical properties of the mantle and enhances its ability to melt or convect. Its presence can also be used to trace recycling of surface reservoirs down to the deep mantle1, which makes knowledge of the water content in the Earthtextquoterights interior and its evolution crucial for understanding global geodynamics. Komatiites (MgO-rich ultramafic magmas) result from a high degree of mantle melting at high pressures2 and thus are excellent probes of the chemical composition and water contents of the deep mantle. An excess of water over elements that show similar geochemical behaviour during mantle melting (for example, cerium) was recently found in melt inclusions in the most magnesium-rich olivine in 2.7-billion-year-old komatiites from Canada3 and Zimbabwe4. These data were taken as evidence for a deep hydrated mantle reservoir, probably the transition zone, in the Neoarchaean era (2.8 to 2.5 billion years ago). Here we confirm the mantle source of this water by measuring deuterium-to-hydrogen ratios in these melt inclusions and present similar data for 3.3-billion-year-old komatiites from the Barberton greenstone belt. From the hydrogen isotope ratios, we show that the mantle sources of these melts contained excess water, which implies that a deep hydrous mantle reservoir has been present in the Earthtextquoterights interior since at least the Palaeoarchaean era (3.6 to 3.2 billion years ago). The reconstructed initial hydrogen isotope composition of komatiites is more depleted in deuterium than surface reservoirs or typical mantle but resembles that of oceanic crust that was initially altered by seawater and then dehydrated during subduction. Together with an excess of chlorine and depletion of lead in the mantle sources of komatiites, these results indicate that seawater-altered lithosphere recycling into the deep mantle, arguably by subduction, started before 3.3 billion years ago.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Water strongly influences the physical properties of the mantle and enhances its ability to melt or convect. Its presence can also be used to trace recycling of surface reservoirs down to the deep mantle1, which makes knowledge of the water content in the Earthtextquoterights interior and its evolution crucial for understanding global geodynamics. Komatiites (MgO-rich ultramafic magmas) result from a high degree of mantle melting at high pressures2 and thus are excellent probes of the chemical composition and water contents of the deep mantle. An excess of water over elements that show similar geochemical behaviour during mantle melting (for example, cerium) was recently found in melt inclusions in the most magnesium-rich olivine in 2.7-billion-year-old komatiites from Canada3 and Zimbabwe4. These data were taken as evidence for a deep hydrated mantle reservoir, probably the transition zone, in the Neoarchaean era (2.8 to 2.5 billion years ago). Here we confirm the mantle source of this water by measuring deuterium-to-hydrogen ratios in these melt inclusions and present similar data for 3.3-billion-year-old komatiites from the Barberton greenstone belt. From the hydrogen isotope ratios, we show that the mantle sources of these melts contained excess water, which implies that a deep hydrous mantle reservoir has been present in the Earthtextquoterights interior since at least the Palaeoarchaean era (3.6 to 3.2 billion years ago). The reconstructed initial hydrogen isotope composition of komatiites is more depleted in deuterium than surface reservoirs or typical mantle but resembles that of oceanic crust that was initially altered by seawater and then dehydrated during subduction. Together with an excess of chlorine and depletion of lead in the mantle sources of komatiites, these results indicate that seawater-altered lithosphere recycling into the deep mantle, arguably by subduction, started before 3.3 billion years ago. |
2018
|
Asafov, E. V., Sobolev, A. V., Gurenko, A. A., Arndt, N. T., Batanova, V. G., Portnyagin, M. V., Garbe-Schönberg, D., Krasheninnikov, S. P. Belingwe komatiites (2.7 Ga) originate from a plume with moderate water content, as inferred from inclusions in olivine (Article de journal) Dans: Chemical Geology, vol. 478, p. 39–59, 2018. @article{Asafov_etal2018,
title = {Belingwe komatiites (2.7 Ga) originate from a plume with moderate water content, as inferred from inclusions in olivine},
author = {E. V. Asafov and A. V. Sobolev and A. A. Gurenko and N. T. Arndt and V. G. Batanova and M. V. Portnyagin and D. Garbe-Sch\"{o}nberg and S. P. Krasheninnikov},
doi = {ht10.1016/j.chemgeo.2017.11.002},
year = {2018},
date = {2018-01-01},
journal = {Chemical Geology},
volume = {478},
pages = {39--59},
abstract = {Major and trace elements, and volatile components have been measured in melt inclusions in olivine from fresh 2.7 Ga old komatiites from the Reliance Formation of the Belingwe Greenstone Belt, Zimbabwe. Reconstructed compositions of melt inclusions contain 20--23.5 wt% MgO and up to 0.3 wt% H2O ; these compositions probably represent those of the erupted lava. In inclusions in relatively evolved (low Fo) olivines, an excess of Na2O, CaO, Li, La, Cu, Rb as well as volatile components (H2O, F, Cl and S) relative to other highly incompatible elements is attributed to assimilation of seawater altered mafic material. No assimilation signature is observed for the most primitive melt inclusions hosted in the magnesium rich olivines. The primary melt composition, estimated using melt inclusions and the composition of the most magnesian olivine (Fo 93.5), contains up to 27.5 wt% MgO and ca. 0.2 wt% H2O. The presence of H2O slightly depressed the liquidus temperature to ca. 1513 textdegreeC. Our results suggest formation of the Belingwe komatiite magma at ca. 7 GPa pressure and ca. 1790 textdegreeC temperature in a mantle plume. The plume picked up water and probably chlorine through interaction with a hydrous transition mantle zone in the way similar to that previously proposed by Sobolev et al. (2016) for komatiites in Canada.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Major and trace elements, and volatile components have been measured in melt inclusions in olivine from fresh 2.7 Ga old komatiites from the Reliance Formation of the Belingwe Greenstone Belt, Zimbabwe. Reconstructed compositions of melt inclusions contain 20--23.5 wt% MgO and up to 0.3 wt% H2O ; these compositions probably represent those of the erupted lava. In inclusions in relatively evolved (low Fo) olivines, an excess of Na2O, CaO, Li, La, Cu, Rb as well as volatile components (H2O, F, Cl and S) relative to other highly incompatible elements is attributed to assimilation of seawater altered mafic material. No assimilation signature is observed for the most primitive melt inclusions hosted in the magnesium rich olivines. The primary melt composition, estimated using melt inclusions and the composition of the most magnesian olivine (Fo 93.5), contains up to 27.5 wt% MgO and ca. 0.2 wt% H2O. The presence of H2O slightly depressed the liquidus temperature to ca. 1513 textdegreeC. Our results suggest formation of the Belingwe komatiite magma at ca. 7 GPa pressure and ca. 1790 textdegreeC temperature in a mantle plume. The plume picked up water and probably chlorine through interaction with a hydrous transition mantle zone in the way similar to that previously proposed by Sobolev et al. (2016) for komatiites in Canada. |
Gurenko, A. A., Belousova, E., Kamenetsky, V. S., Zelenski, M. E. Origin of volatiles emitted by Plinian mafic eruptions of the Chikurachki volcano, Kurile arc, Russia: Trace element, boron and sulphur isotope constraints (Article de journal) Dans: Chemical Geology, vol. 478, p. 131–147, 2018. @article{Gurenko_etal2018,
title = {Origin of volatiles emitted by Plinian mafic eruptions of the Chikurachki volcano, Kurile arc, Russia: Trace element, boron and sulphur isotope constraints},
author = {A. A. Gurenko and E. Belousova and V. S. Kamenetsky and M. E. Zelenski},
doi = {10.1016/j.chemgeo.2017.10.009},
year = {2018},
date = {2018-01-01},
journal = {Chemical Geology},
volume = {478},
pages = {131--147},
abstract = {Chikurachki is a 1816-m high stratovolcano on Paramushir Island, Kurile arc, Russia, which has repeatedly produced highly explosive eruptions of mafic composition. The present work is aimed at constraining the origin of volatile components (CO2, H2O, F, S, and Cl), along with B and S isotopic compositions in a series of phenocryst-hosted melt inclusions and groundmass glasses from basaltic andesite pyroclasts of the 1853, 1986, and prehistoric Plinian eruptions of the volcano. The ranges of volatile concentrations in melt inclusions (47--1580 $mu$g/g CO2, 0.4--4.2 wt% H2O, 399--633 $mu$g/g F, 619--3402 $mu$g/g S and 805--1240 $mu$g/g Cl) imply asudden pressure release from textasciitilde460 through textasciitilde35 MPa that corresponds to textasciitilde1.2--16-km-depth range of magma ascent upon decompression. We conclude that rapid ascent of the volatile-rich basaltic magmas from textasciitilde16-km initial depth accompanied by near-surface bubble nucleation and growth, and subsequent magma fragmentationappear to be a primary reason for the Plinian character of the Chikurachki eruptions. Significant negative correlations of S with K, Zr, Nb, Ba, La, Ce, Pr (R =−0.8 to −0.9), no clear relationships of S with H2O, CO2 and Cl, but strong positive correlations of S/K2O with H2O/K2O, Cl/K2O and F/K2O preclude magma degassing to be the only process affecting volatile concentrations dissolved in the melt. The $delta$34S values of the studied inclusion and groundmass glasses range from −1.6 to +12.3texttenthousand, decrease with decreasing S, show significant positive correlations with H2O/K2O, Cl/K2O and F/Zr, and negative correlations with a number of incompatible trace elements. Neither open- nor close-system magma degassing can account for the observed range of $delta$34S. The $delta$11B values of the melt inclusions range from−7.0 to+2.4texttenthousandwith 13--23 $mu$g/g B. The relationships of $delta$11B withB/K2O and B/Nb are inconsistent with magma contamination at shallow crustal depths. Linear character of 1/S vs. $delta$34S relationship suggests two-component mixing. The possible mixing end-members could be the magmas having similar major and trace element compositions, but strongly contrasting volatile contents and S isotopes.Based on the behaviour of fluid-mobile vs. fluid-immobile incompatible trace elements, we conclude that the subduction component likely represents a mixture of subduction sediment-derived melt with up to 60% of slabderived fluid. Admixture of textasciitilde1--8% of the inferred subduction component to the depleted mantle wedge sourceis required to account for the compositional range of the Chikurachki melt inclusions, and textasciitilde0.4--10% to constrain the composition of Kurile arc mafic magmas.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Chikurachki is a 1816-m high stratovolcano on Paramushir Island, Kurile arc, Russia, which has repeatedly produced highly explosive eruptions of mafic composition. The present work is aimed at constraining the origin of volatile components (CO2, H2O, F, S, and Cl), along with B and S isotopic compositions in a series of phenocryst-hosted melt inclusions and groundmass glasses from basaltic andesite pyroclasts of the 1853, 1986, and prehistoric Plinian eruptions of the volcano. The ranges of volatile concentrations in melt inclusions (47--1580 $mu$g/g CO2, 0.4--4.2 wt% H2O, 399--633 $mu$g/g F, 619--3402 $mu$g/g S and 805--1240 $mu$g/g Cl) imply asudden pressure release from textasciitilde460 through textasciitilde35 MPa that corresponds to textasciitilde1.2--16-km-depth range of magma ascent upon decompression. We conclude that rapid ascent of the volatile-rich basaltic magmas from textasciitilde16-km initial depth accompanied by near-surface bubble nucleation and growth, and subsequent magma fragmentationappear to be a primary reason for the Plinian character of the Chikurachki eruptions. Significant negative correlations of S with K, Zr, Nb, Ba, La, Ce, Pr (R =−0.8 to −0.9), no clear relationships of S with H2O, CO2 and Cl, but strong positive correlations of S/K2O with H2O/K2O, Cl/K2O and F/K2O preclude magma degassing to be the only process affecting volatile concentrations dissolved in the melt. The $delta$34S values of the studied inclusion and groundmass glasses range from −1.6 to +12.3texttenthousand, decrease with decreasing S, show significant positive correlations with H2O/K2O, Cl/K2O and F/Zr, and negative correlations with a number of incompatible trace elements. Neither open- nor close-system magma degassing can account for the observed range of $delta$34S. The $delta$11B values of the melt inclusions range from−7.0 to+2.4texttenthousandwith 13--23 $mu$g/g B. The relationships of $delta$11B withB/K2O and B/Nb are inconsistent with magma contamination at shallow crustal depths. Linear character of 1/S vs. $delta$34S relationship suggests two-component mixing. The possible mixing end-members could be the magmas having similar major and trace element compositions, but strongly contrasting volatile contents and S isotopes.Based on the behaviour of fluid-mobile vs. fluid-immobile incompatible trace elements, we conclude that the subduction component likely represents a mixture of subduction sediment-derived melt with up to 60% of slabderived fluid. Admixture of textasciitilde1--8% of the inferred subduction component to the depleted mantle wedge sourceis required to account for the compositional range of the Chikurachki melt inclusions, and textasciitilde0.4--10% to constrain the composition of Kurile arc mafic magmas. |
Gurenko, A. A., Sobolev, A. V. Can orthopyroxene be present in the source of Toro-Ankole, East African Rift, Kamafugites? (Article de journal) Dans: Journal of Petrology, vol. 59, no. 8, p. 1517–1550, 2018. @article{Gurenko+Sobolev2018,
title = {Can orthopyroxene be present in the source of Toro-Ankole, East African Rift, Kamafugites?},
author = {A. A. Gurenko and A. V. Sobolev},
doi = {10.1093/petrology/egy069},
year = {2018},
date = {2018-01-01},
journal = {Journal of Petrology},
volume = {59},
number = {8},
pages = {1517--1550},
abstract = {We have studied mineral-hosted melt, crystal and fluid inclusions from two ugandite, one mafurite and two katungite samples from the Toro-Ankole volcanic province in the East African Rift, which is the archetypal location for kamafugitic rocks. A main finding of our study is the presence of orthopyroxene as inclusions in an early generation of olivine from all three types of kamafugites, suggesting interaction of a carbonate-rich metasomatic agent with lithospheric peridotite mantle that may have caused almost complete dissolution of orthopyroxene. This process was preceded, accompanied or followed by the formation of phlogopite--clinopyroxene veins resulting from interaction of F-rich and low H2O/CO2 metasomatic fluids with the mantle rocks, which then became the source of the Toro-Ankole kamafugites. Pressure--temperature (P--T) estimates suggest that the parental kamafugitic melts last equilibrated with their source rocks at 16+-8 kbar and 1160+-130textdegreeC. This implies that they could have originated significantly below the solidus of dry, carbonated peridotite, but above the solidus of phlogopite-bearing clinopyroxenite. We conclude that the Toro-Ankole kamafugites originated by very low degrees of partial melting at moderately oxidized conditions (�'uFMQ = +2.2+-0.4 atm log units, where FMQ is fayalite--magnetite--quartz buffer) under a high geothermal gradient of 60--80mWm-2, in response to lithospheric extension and probable association with an adjacent mantle plume. We estimate that differentiation of parental ugandite, mafurite and katungite magmas could have occurred at depths \<12km in the T range 1150--850textdegreeC. Laboratory-heated, homogenized melt inclusions trapped by a second generation of olivine and clinopyroxene are characterized by remarkable silica-undersaturation, compared with mid-ocean ridge basalt and ocean island basalt magmas, with high concentrations of alkalis, Ti, Ba, Sr and Zr, but varying to very low concentrations of Al and Ca. Such alkali-rich, strongly evolved melts might have resulted from extreme (\>95%) fractional crystallization of the parental magmas, assuming their chemical compositions to be similar to those of the respective lavas. However, this estimate is about three times higher than the modal amount of phenocrysts in the lavas that could be reinforced by the presence of excess cognate crystals and/or xenocrysts in the lavas. Strong oxidation from FMQ+2 to FMQ+4 to +5.2 atm log units of the evolved mafuritic magmas at 900--1000textdegreeC has occurred during the final stage of magma evolution at very shallow crustal depths or possibly directly in the lava flow.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have studied mineral-hosted melt, crystal and fluid inclusions from two ugandite, one mafurite and two katungite samples from the Toro-Ankole volcanic province in the East African Rift, which is the archetypal location for kamafugitic rocks. A main finding of our study is the presence of orthopyroxene as inclusions in an early generation of olivine from all three types of kamafugites, suggesting interaction of a carbonate-rich metasomatic agent with lithospheric peridotite mantle that may have caused almost complete dissolution of orthopyroxene. This process was preceded, accompanied or followed by the formation of phlogopite--clinopyroxene veins resulting from interaction of F-rich and low H2O/CO2 metasomatic fluids with the mantle rocks, which then became the source of the Toro-Ankole kamafugites. Pressure--temperature (P--T) estimates suggest that the parental kamafugitic melts last equilibrated with their source rocks at 16+-8 kbar and 1160+-130textdegreeC. This implies that they could have originated significantly below the solidus of dry, carbonated peridotite, but above the solidus of phlogopite-bearing clinopyroxenite. We conclude that the Toro-Ankole kamafugites originated by very low degrees of partial melting at moderately oxidized conditions (�'uFMQ = +2.2+-0.4 atm log units, where FMQ is fayalite--magnetite--quartz buffer) under a high geothermal gradient of 60--80mWm-2, in response to lithospheric extension and probable association with an adjacent mantle plume. We estimate that differentiation of parental ugandite, mafurite and katungite magmas could have occurred at depths <12km in the T range 1150--850textdegreeC. Laboratory-heated, homogenized melt inclusions trapped by a second generation of olivine and clinopyroxene are characterized by remarkable silica-undersaturation, compared with mid-ocean ridge basalt and ocean island basalt magmas, with high concentrations of alkalis, Ti, Ba, Sr and Zr, but varying to very low concentrations of Al and Ca. Such alkali-rich, strongly evolved melts might have resulted from extreme (>95%) fractional crystallization of the parental magmas, assuming their chemical compositions to be similar to those of the respective lavas. However, this estimate is about three times higher than the modal amount of phenocrysts in the lavas that could be reinforced by the presence of excess cognate crystals and/or xenocrysts in the lavas. Strong oxidation from FMQ+2 to FMQ+4 to +5.2 atm log units of the evolved mafuritic magmas at 900--1000textdegreeC has occurred during the final stage of magma evolution at very shallow crustal depths or possibly directly in the lava flow. |
Zelenski, M., Kamenetsky, V. S., Mavrogenes, J. A., Gurenko, A. A., Danyushevsky, L. V. Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts (Article de journal) Dans: Chemical Geology, vol. 478, p. 102–111, 2018. @article{Zelenski_etal2018,
title = {Silicate-sulfide liquid immiscibility in modern arc basalt (Tolbachik volcano, Kamchatka): Part I. Occurrence and compositions of sulfide melts},
author = {M. Zelenski and V. S. Kamenetsky and J. A. Mavrogenes and A. A. Gurenko and L. V. Danyushevsky},
doi = {10.1016/j.chemgeo.2017.09.013},
year = {2018},
date = {2018-01-01},
journal = {Chemical Geology},
volume = {478},
pages = {102--111},
abstract = {Silicate-sulfide liquid immiscibility plays a key role in the formation of magmatic sulfide ore deposits but incipient sulfide melts are rarely preserved in natural rocks. This study presents the distribution and compositions of olivine-hosted sulfide melt globules resulting from silicate-sulfide liquid immiscibility in primitive arc basalts. Abundant sulfide droplets entrapped in olivine from primitive basalts of the 1941 eruption and pre-historic eruptive cone textquotelefttextquoteleftMt. 1004textquoterighttextquoteright of the Tolbachik volcano, Kurile-Kamchatka arc. Inclusions range from submicron to250 $mu$m in size, coexist with sulfur-rich glass (≤1.1 wt% S), and, in some cases, with magmatic anhydrite. Saturation in sulfide occurred early in the evolution of a water- and sulfur-rich magma, moderately oxidized (QFM+1 to +1.5), which crystallized high-Mg olivine (Fo86--92), clinopyroxene and Cr-spinel. The processdeveloped dense textquotelefttextquoteleftcloudstextquoterighttextquoteright of sulfide in relatively small volumes of magma, with highly variable abundances of chalcophile metals. The low degree of sulfide supersaturation promoted diffusive equilibration of the growing droplets with the melt in Ni and Cu, resulting in high concentrations (≈38 mol%) of CuS and NiS in the earliest sulfide liquids. The Tolbachik samples provide a glimpse into deep arc processes not seen elsewhere, and may show how arc magmas, despite their oxidized nature, saturate in sulfide.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Silicate-sulfide liquid immiscibility plays a key role in the formation of magmatic sulfide ore deposits but incipient sulfide melts are rarely preserved in natural rocks. This study presents the distribution and compositions of olivine-hosted sulfide melt globules resulting from silicate-sulfide liquid immiscibility in primitive arc basalts. Abundant sulfide droplets entrapped in olivine from primitive basalts of the 1941 eruption and pre-historic eruptive cone textquotelefttextquoteleftMt. 1004textquoterighttextquoteright of the Tolbachik volcano, Kurile-Kamchatka arc. Inclusions range from submicron to250 $mu$m in size, coexist with sulfur-rich glass (≤1.1 wt% S), and, in some cases, with magmatic anhydrite. Saturation in sulfide occurred early in the evolution of a water- and sulfur-rich magma, moderately oxidized (QFM+1 to +1.5), which crystallized high-Mg olivine (Fo86--92), clinopyroxene and Cr-spinel. The processdeveloped dense textquotelefttextquoteleftcloudstextquoterighttextquoteright of sulfide in relatively small volumes of magma, with highly variable abundances of chalcophile metals. The low degree of sulfide supersaturation promoted diffusive equilibration of the growing droplets with the melt in Ni and Cu, resulting in high concentrations (≈38 mol%) of CuS and NiS in the earliest sulfide liquids. The Tolbachik samples provide a glimpse into deep arc processes not seen elsewhere, and may show how arc magmas, despite their oxidized nature, saturate in sulfide. |
2016
|
Borisova, A. Y., Gurenko, A. A., Martel, C., Kouzmanov, K., Cathala, A., Bohrson, W. A., Pratomo, I., Sumarti, S. Oxygen isotope heterogeneity of arc magma recorded in plagioclase from the 2010 Merapi eruption (Central Java, Indonesia) (Article de journal) Dans: Geochimica et Cosmochimica Acta, vol. 190, p. 13–34, 2016. @article{Borisova_etal2016,
title = {Oxygen isotope heterogeneity of arc magma recorded in plagioclase from the 2010 Merapi eruption (Central Java, Indonesia)},
author = {A. Y. Borisova and A. A. Gurenko and C. Martel and K. Kouzmanov and A. Cathala and W. A. Bohrson and I. Pratomo and S. Sumarti},
doi = {10.1016/j.gca.2016.06.020},
year = {2016},
date = {2016-01-01},
journal = {Geochimica et Cosmochimica Acta},
volume = {190},
pages = {13--34},
abstract = {Chemical and isotopic compositions of magmatic crystals provide important information to distinguish between deep juvenile and crustal contributions. In this work, high-resolution multicollector secondary ion mass spectrometry data reveal strong variations of d18O values in three plagioclase crystals (800--1700 lm) from two representative basaltic andesite samples of the 2010 Merapi eruption (Central Java, Indonesia). The d18O values (from 4.6texttenthousand to 7.9texttenthousand) are interpreted to reflect oxygen isotope heterogeneity in the melt composition during plagioclase growth. The lowest d18O values (4.6--6.6texttenthousand) are found in anorthite-rich cores (An82--97), whereas higher d18O values (5.7--7.9texttenthousand) are found in anorthite-poorer zones (An33--86), typically in crystal rims. Combining these new plagioclase d18O data with d18O of calc-silicate crustal xenoliths erupted between 1994 and 1998, the composition of glass inclusions hosted by the anorthite-rich plagioclase (An82--92), available experimental data, and the results of thermodynamic modeling using the Magma Chamber Simulator code, we conclude that the abundant anorthite-rich cores crystallized from a mantle-derived hydrous basaltic to basaltic trachyandesite melt that recharged a deeper (200--600 MPa) magma storage zone, whereas lower anorthite zones crystallized at shallower levels (100--200 MPa). The oxygen isotope variations in the plagioclase are explained by a two-stage model of interaction of the hydrous, mafic mantlederived magma (1) with old crustal rocks depleted in 18O due to high temperature alteration that yielded the low d18O values in the anorthite-rich cores at deep levels (13--20 km), and later (2) with 18O-enriched carbonate material that yielded the high d18O values in anorthite-poorer zones at shallow levels (�`u4.5--9 km). Thermodynamic modeling is consistent with �`u18 wt.% assimilation of crustal calc-silicate material at 925--950 textdegreeC and 100--200 MPa by the 2010 Merapi basaltic andesite magma prior to eruption. Timescales for plagioclase phenocryst growth and residence in the magmatic plumbing system are 634 years. The combined data thus reveal efficient magma recharge and crustal assimilation processes that characterize the open-system magma storage and transport systems associated with the 2010 Merapi eruption.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Chemical and isotopic compositions of magmatic crystals provide important information to distinguish between deep juvenile and crustal contributions. In this work, high-resolution multicollector secondary ion mass spectrometry data reveal strong variations of d18O values in three plagioclase crystals (800--1700 lm) from two representative basaltic andesite samples of the 2010 Merapi eruption (Central Java, Indonesia). The d18O values (from 4.6texttenthousand to 7.9texttenthousand) are interpreted to reflect oxygen isotope heterogeneity in the melt composition during plagioclase growth. The lowest d18O values (4.6--6.6texttenthousand) are found in anorthite-rich cores (An82--97), whereas higher d18O values (5.7--7.9texttenthousand) are found in anorthite-poorer zones (An33--86), typically in crystal rims. Combining these new plagioclase d18O data with d18O of calc-silicate crustal xenoliths erupted between 1994 and 1998, the composition of glass inclusions hosted by the anorthite-rich plagioclase (An82--92), available experimental data, and the results of thermodynamic modeling using the Magma Chamber Simulator code, we conclude that the abundant anorthite-rich cores crystallized from a mantle-derived hydrous basaltic to basaltic trachyandesite melt that recharged a deeper (200--600 MPa) magma storage zone, whereas lower anorthite zones crystallized at shallower levels (100--200 MPa). The oxygen isotope variations in the plagioclase are explained by a two-stage model of interaction of the hydrous, mafic mantlederived magma (1) with old crustal rocks depleted in 18O due to high temperature alteration that yielded the low d18O values in the anorthite-rich cores at deep levels (13--20 km), and later (2) with 18O-enriched carbonate material that yielded the high d18O values in anorthite-poorer zones at shallow levels (�`u4.5--9 km). Thermodynamic modeling is consistent with �`u18 wt.% assimilation of crustal calc-silicate material at 925--950 textdegreeC and 100--200 MPa by the 2010 Merapi basaltic andesite magma prior to eruption. Timescales for plagioclase phenocryst growth and residence in the magmatic plumbing system are 634 years. The combined data thus reveal efficient magma recharge and crustal assimilation processes that characterize the open-system magma storage and transport systems associated with the 2010 Merapi eruption. |
France, L., Demacon, M., Gurenko, A. A., Briot, D. Oxygen isotopes reveal crustal contamination and a large, still partially molten magma chamber in Cha^ine des Puys (French Massif Central) (Article de journal) Dans: Lithos, vol. 260, p. 328–338, 2016. @article{France_etal2016,
title = {Oxygen isotopes reveal crustal contamination and a large, still partially molten magma chamber in Cha^ine des Puys (French Massif Central)},
author = {L. France and M. Demacon and A. A. Gurenko and D. Briot},
doi = {10.1016/j.lithos.2016.05.013},
year = {2016},
date = {2016-01-01},
journal = {Lithos},
volume = {260},
pages = {328--338},
abstract = {The two main magmatic properties associated with explosive eruptions are high viscosity of silica-rich magmas and/or high volatile contents. Magmatic processes responsible for the genesis of such magmas are differentiation through crystallization, and crustal contamination (or assimilation) as this process has the potential to enhance crystallization and add volatiles to the initial budget. In the Cha^ine des Puy series (FrenchMassif Central), silica and H2O-rich magmas were only emitted during the most recent eruptions (ca. 6--15 ka). Here, we use in situ measurements of oxygen isotopes in zircons from two of the main trachytic eruptions from the Cha^ine des Puys to track the crustal contamination component in a sequence thatwas previously presented as an archetypal fractional crystallization series. Zircons from Sarcoui volcano and Puy de D^ome display homogeneous oxygen isotope compositions with $delta$18O = 5.6 textpm 0.25texttenthousand and 5.6 textpm 0.3texttenthousand, respectively, and have therefore crystallized from homogeneous melts with $delta$18Omelt = 7.1 textpm 0.3texttenthousand. Compared to mantle derived melts resulting from pure fractional crystallization ($delta$18Odif.mant. = 6.4 textpm 0.4texttenthousand), those $delta$18Omelt values are enriched in 18O and support a significant role of crustal contamination in the genesis of silica-rich melts in the Cha^ine des Puys. Assimilation--fractional--crystallization models highlight that the degree of contamination was probably restricted to 5.5--9.5% with Rcrystallization/Rassimilation varying between 8 and 14. The very strong intra-site homogeneity of the isotopic data highlights that magmas were well homogenized before eruption, and consequently that crustal contamination was not the trigger of silica-rich eruptions in the Cha^ine des Puys. The exceptionally strong inter-site homogeneity of the isotopic data brings to light that Sarcoui volcano and Puy de D^ome were fed by a single large magma chamber. Our results, together with recent thermo-kinetic models and an experimental simulation (Martel et al., 2013), support the existence of a large (textasciitilde6--15 km3), still partially molten mid-crustal reservoir (10--12 km deep) that is filled with silica-rich magma},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The two main magmatic properties associated with explosive eruptions are high viscosity of silica-rich magmas and/or high volatile contents. Magmatic processes responsible for the genesis of such magmas are differentiation through crystallization, and crustal contamination (or assimilation) as this process has the potential to enhance crystallization and add volatiles to the initial budget. In the Cha^ine des Puy series (FrenchMassif Central), silica and H2O-rich magmas were only emitted during the most recent eruptions (ca. 6--15 ka). Here, we use in situ measurements of oxygen isotopes in zircons from two of the main trachytic eruptions from the Cha^ine des Puys to track the crustal contamination component in a sequence thatwas previously presented as an archetypal fractional crystallization series. Zircons from Sarcoui volcano and Puy de D^ome display homogeneous oxygen isotope compositions with $delta$18O = 5.6 textpm 0.25texttenthousand and 5.6 textpm 0.3texttenthousand, respectively, and have therefore crystallized from homogeneous melts with $delta$18Omelt = 7.1 textpm 0.3texttenthousand. Compared to mantle derived melts resulting from pure fractional crystallization ($delta$18Odif.mant. = 6.4 textpm 0.4texttenthousand), those $delta$18Omelt values are enriched in 18O and support a significant role of crustal contamination in the genesis of silica-rich melts in the Cha^ine des Puys. Assimilation--fractional--crystallization models highlight that the degree of contamination was probably restricted to 5.5--9.5% with Rcrystallization/Rassimilation varying between 8 and 14. The very strong intra-site homogeneity of the isotopic data highlights that magmas were well homogenized before eruption, and consequently that crustal contamination was not the trigger of silica-rich eruptions in the Cha^ine des Puys. The exceptionally strong inter-site homogeneity of the isotopic data brings to light that Sarcoui volcano and Puy de D^ome were fed by a single large magma chamber. Our results, together with recent thermo-kinetic models and an experimental simulation (Martel et al., 2013), support the existence of a large (textasciitilde6--15 km3), still partially molten mid-crustal reservoir (10--12 km deep) that is filled with silica-rich magma |
Sobolev, A. V., Asafov, E. V., Gurenko, A. A., Arndt, N. T., Batanova, V. G., Portnyagin, M. V., Garbe-Schönberg, D., Krasheninnikov, S. P. Komatiites reveal a hydrous Archaean deep-mantle reservoir (Article de journal) Dans: Nature, vol. 628, no. 531, 2016. @article{Sobolev_etal2016,
title = {Komatiites reveal a hydrous Archaean deep-mantle reservoir},
author = {A. V. Sobolev and E. V. Asafov and A. A. Gurenko and N. T. Arndt and V. G. Batanova and M. V. Portnyagin and D. Garbe-Sch\"{o}nberg and S. P. Krasheninnikov},
doi = {10.1038/nature17152},
year = {2016},
date = {2016-01-01},
journal = {Nature},
volume = {628},
number = {531},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2015
|
Gurenko, A. A., Bindeman, I. N., Sigurdson, I. A. To the origin of Icelandic rhyolites: insights from partially melted leucocratic xenoliths (Article de journal) Dans: Contributions to Mineralogy and Petrology, vol. 169, p. 49, 2015. @article{Gurenko_etal2015,
title = {To the origin of Icelandic rhyolites: insights from partially melted leucocratic xenoliths},
author = {A. A. Gurenko and I. N. Bindeman and I. A. Sigurdson},
doi = {10.1007/s00410-015-1145-4},
year = {2015},
date = {2015-01-01},
journal = {Contributions to Mineralogy and Petrology},
volume = {169},
pages = {49},
abstract = {We have studied glass-bearing leucocratic (granitic to Qz-monzonitic) crustal xenoliths from the Tindfj\"{o}ll Pleistocene volcanic complex, SW Iceland. Thexenoliths consist of strongly resorbed relicts of anorthitic plagioclase, K-rich feldspar and rounded quartz in colorless through pale to dark-brown interstitial glass. Spongy clinopyroxene and/or rounded or elongated crystals of orthopyroxene are in subordinate amount. Magnetite, ilmenite, zircon, apatite, allanite and/or chevkinite are accessory minerals. The xenoliths more likely are relicts of earlier-formed, partially melted Si-rich rocks or quartz--feldspar-rich crystal segregations, which suffered latter interaction with hotter and more primitive magma(s). Icelandic lavas are typically low in $delta$18O compared to mantlederived,textquotelefttextquoteleftMORBtextquoterighttextquoteright-like rocks (textasciitilde5.6 textpm 0.2 texttenthousand), likely due to their interaction with, or contamination by, the uppercrustal rocks affected by rain and glacial melt waters.Surprisingly, many quartz and feldspar crystals and associated colorless to light-colored interstitial glasses of the studied xenoliths are not low but high in $delta$18O (5.1--7.2 texttenthousand, excluding three dark-brown glasses of 4--5 texttenthousand). The xenoliths contain abundant, low- to high-$delta$18O (2.4--6.3 texttenthousand) young zircons (U--Pb age 0.2--0.27 textpm 0.03 Ma; U--Th age 0.16 textpm 0.07 Ma), most of them in oxygen isotope equilibrium with interstitial glasses. The $delta$18O values \>5.6 texttenthousand recorded in the coexisting zircon, quartz, feldspar and colorless interstitial glass suggest crystallization frommelts produced by fusion of crustal rocks altered by seawater, also reflecting multiple melting and crystallization events. This suggests that textquotelefttextquoteleftnormaltextquoterighttextquoteright-$delta$18O silicic magmas may not be ultimately produced by crystallization of mafic, basaltic magmas. Instead, our new single-crystal laser fluorination and ion microprobe O-isotope data suggest addition of diverse partial crustal melts, probably originated from variously altered and preconditioned crust.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have studied glass-bearing leucocratic (granitic to Qz-monzonitic) crustal xenoliths from the Tindfjöll Pleistocene volcanic complex, SW Iceland. Thexenoliths consist of strongly resorbed relicts of anorthitic plagioclase, K-rich feldspar and rounded quartz in colorless through pale to dark-brown interstitial glass. Spongy clinopyroxene and/or rounded or elongated crystals of orthopyroxene are in subordinate amount. Magnetite, ilmenite, zircon, apatite, allanite and/or chevkinite are accessory minerals. The xenoliths more likely are relicts of earlier-formed, partially melted Si-rich rocks or quartz--feldspar-rich crystal segregations, which suffered latter interaction with hotter and more primitive magma(s). Icelandic lavas are typically low in $delta$18O compared to mantlederived,textquotelefttextquoteleftMORBtextquoterighttextquoteright-like rocks (textasciitilde5.6 textpm 0.2 texttenthousand), likely due to their interaction with, or contamination by, the uppercrustal rocks affected by rain and glacial melt waters.Surprisingly, many quartz and feldspar crystals and associated colorless to light-colored interstitial glasses of the studied xenoliths are not low but high in $delta$18O (5.1--7.2 texttenthousand, excluding three dark-brown glasses of 4--5 texttenthousand). The xenoliths contain abundant, low- to high-$delta$18O (2.4--6.3 texttenthousand) young zircons (U--Pb age 0.2--0.27 textpm 0.03 Ma; U--Th age 0.16 textpm 0.07 Ma), most of them in oxygen isotope equilibrium with interstitial glasses. The $delta$18O values >5.6 texttenthousand recorded in the coexisting zircon, quartz, feldspar and colorless interstitial glass suggest crystallization frommelts produced by fusion of crustal rocks altered by seawater, also reflecting multiple melting and crystallization events. This suggests that textquotelefttextquoteleftnormaltextquoterighttextquoteright-$delta$18O silicic magmas may not be ultimately produced by crystallization of mafic, basaltic magmas. Instead, our new single-crystal laser fluorination and ion microprobe O-isotope data suggest addition of diverse partial crustal melts, probably originated from variously altered and preconditioned crust. |
2013
|
Gurenko, A. A., Geldmacher, J., Hoernle, K. A., Sobolev, A. V. A composite, isotopically-depleted peridotite and enriched pyroxenite source for Madeira magmas: Insights from olivine (Article de journal) Dans: Lithos, vol. 170-171, p. 224–238, 2013. @article{Gurenko_etal2013,
title = {A composite, isotopically-depleted peridotite and enriched pyroxenite source for Madeira magmas: Insights from olivine},
author = {A. A. Gurenko and J. Geldmacher and K. A. Hoernle and A. V. Sobolev},
doi = {10.1016/j.lithos.2013.03.002},
year = {2013},
date = {2013-01-01},
journal = {Lithos},
volume = {170-171},
pages = {224--238},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2012
|
Teagle, D. A. H., Ildefonse, B., Blum, P., Scientists., Expedition 335 Superfast Spreading Rate Crust 4 Expedition 335 of the riserless drilling platform Puntarenas, Costa Rica, to Balboa, Panama Site 1256 (Article de journal) Dans: Proceedings of the Integrated Ocean Drilling Program, Management International, Inc., vol. 335, 2012. @article{Teagle_etal2012,
title = {Superfast Spreading Rate Crust 4 Expedition 335 of the riserless drilling platform Puntarenas, Costa Rica, to Balboa, Panama Site 1256},
author = {D. A. H. Teagle and B. Ildefonse and P. Blum and Expedition 335 Scientists.},
doi = {10.2204/iodp.proc.335.2012},
year = {2012},
date = {2012-01-01},
journal = {Proceedings of the Integrated Ocean Drilling Program, Management International, Inc.},
volume = {335},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2011
|
Gurenko, A. A., Kamenetsky, V. S. Boron isotopic composition of olivine-hosted melt inclusions from Gorgona komatiites, Colombia: New evidence supporting wet komatiite origin (Article de journal) Dans: Earth and Planetary Science Letters, vol. 312, no. 1-2, p. 201–212, 2011. @article{Gurenko+Kamenetsky2011,
title = {Boron isotopic composition of olivine-hosted melt inclusions from Gorgona komatiites, Colombia: New evidence supporting wet komatiite origin},
author = {A. A. Gurenko and V. S. Kamenetsky},
doi = {10.1016/j.epsl.2011.09.033},
year = {2011},
date = {2011-01-01},
journal = {Earth and Planetary Science Letters},
volume = {312},
number = {1-2},
pages = {201--212},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2002
|
Gurenko, A. A., Chaussidon, M. Oxygen isotope variations in primitive tholeiites of Iceland: evidence from a SIMS study of glass inclusions, olivine phenocrysts and pillow rim glasses (Article de journal) Dans: Earth and Planetary Science Letters, vol. 205, p. 63–79, 2002. @article{Gurenko+Chaussidon2002,
title = {Oxygen isotope variations in primitive tholeiites of Iceland: evidence from a SIMS study of glass inclusions, olivine phenocrysts and pillow rim glasses},
author = {A. A. Gurenko and M. Chaussidon},
year = {2002},
date = {2002-01-01},
journal = {Earth and Planetary Science Letters},
volume = {205},
pages = {63--79},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2001
|
Gurenko, A. A., Chaussidon, M., Schmincke, H. U. Magma ascent and contamination beneath one intraplate volcano : evidence from S and O isotopes in glass inclusions and their host clinopyroxenes from Miocene basaltic hyaloclastites southwest of Gran Canaria (Canary Islands) (Article de journal) Dans: Geochimica et Cosmochimica Acta, vol. 65, no. 23, p. 4359–4374, 2001. @article{Gurenko_etal2001,
title = {Magma ascent and contamination beneath one intraplate volcano : evidence from S and O isotopes in glass inclusions and their host clinopyroxenes from Miocene basaltic hyaloclastites southwest of Gran Canaria (Canary Islands)},
author = {A. A. Gurenko and M. Chaussidon and H. U. Schmincke},
doi = {10.1016/S0016-7037(01)00737-2},
year = {2001},
date = {2001-01-01},
journal = {Geochimica et Cosmochimica Acta},
volume = {65},
number = {23},
pages = {4359--4374},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1997
|
Gurenko, A. A., Chaussidon, M. Boron concentrations and isotopic composition of the Icelandic mantle : evidence from glass inclusions in olivine (Article de journal) Dans: Chemical Geology, vol. 135, p. 21–34, 1997. @article{Gurenko+Chaussidon1997,
title = {Boron concentrations and isotopic composition of the Icelandic mantle : evidence from glass inclusions in olivine},
author = {A. A. Gurenko and M. Chaussidon},
year = {1997},
date = {1997-01-01},
journal = {Chemical Geology},
volume = {135},
pages = {21--34},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1996
|
Gurenko, A. A., Hansteen, T. H., Schmincke, H. U. Evolution of parental magmas of Miocene shield basalts of Gran Canaria (Canary islands): constraints from crystal, melt and fluid inclusions in minerals (Article de journal) Dans: Contributions to Mineralogy and Petrology, vol. 124, p. 422–435, 1996. @article{Gurenko_etal1996,
title = {Evolution of parental magmas of Miocene shield basalts of Gran Canaria (Canary islands): constraints from crystal, melt and fluid inclusions in minerals},
author = {A. A. Gurenko and T. H. Hansteen and H. U. Schmincke},
year = {1996},
date = {1996-01-01},
journal = {Contributions to Mineralogy and Petrology},
volume = {124},
pages = {422--435},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
