2022
|
Defourny, A., Blard, P. H., Zimmermann, L., Jobé, P., Collignon, A., Nguyen, F., Dassargues, A. CO2/3He ratios reveal the presence of mantle gas in the CO2-rich groundwaters of the Ardenne massif (Spa, Belgium) (Article de journal) Dans: Hydrology and Earth Systems Science, 2022. @article{Defourny_etal2022,
title = {CO2/3He ratios reveal the presence of mantle gas in the CO2-rich groundwaters of the Ardenne massif (Spa, Belgium)},
author = {A. Defourny and P. H. Blard and L. Zimmermann and P. Job\'{e} and A. Collignon and F. Nguyen and A. Dassargues},
doi = {10.5194/hess-2021-611},
year = {2022},
date = {2022-01-01},
journal = {Hydrology and Earth Systems Science},
abstract = {Natural CO2-rich groundwaters of eastern Belgium have been known for centuries although the exact origin of the gas they contained was still unclear. This paper presents the results of a sampling campaign in the area (Spa, Stoumont, Malmedy) where 30 samples of both carbogazeous and non-carbogazeous groundwaters have been analyzed for major elements, CO2 content and carbon isotopic composition. Among them, 13 samples were analyzed for 3He/4He and 4He/20Ne ratios. The combination of $delta$13C and 3He/CO2 ratios have 5 shown with a high level of confidence that the CO2 in groundwater from springs and boreholes has a mantellic origin, and can very likely be attributed to the degassing of the neighboring and still buoyant Eifel mantle plume, located at a distance of 100 km eastwards. The identity and nature of the deep-rooted fractures that act as CO2 transport pathway to the surface are still to be clarified, but several major thrust faults exist in the Rhenish Massif and could connect the Eifel volcanic field with the studied area.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Natural CO2-rich groundwaters of eastern Belgium have been known for centuries although the exact origin of the gas they contained was still unclear. This paper presents the results of a sampling campaign in the area (Spa, Stoumont, Malmedy) where 30 samples of both carbogazeous and non-carbogazeous groundwaters have been analyzed for major elements, CO2 content and carbon isotopic composition. Among them, 13 samples were analyzed for 3He/4He and 4He/20Ne ratios. The combination of $delta$13C and 3He/CO2 ratios have 5 shown with a high level of confidence that the CO2 in groundwater from springs and boreholes has a mantellic origin, and can very likely be attributed to the degassing of the neighboring and still buoyant Eifel mantle plume, located at a distance of 100 km eastwards. The identity and nature of the deep-rooted fractures that act as CO2 transport pathway to the surface are still to be clarified, but several major thrust faults exist in the Rhenish Massif and could connect the Eifel volcanic field with the studied area. |
2020
|
Boulliung, J., Füri, E., Dalou, C., Tissandier, L., Zimmermann, L., Marrocchi, Y. Oxygen fugacity and melt composition controls on nitrogen solubility in silicate melts (Article de journal) Dans: Geochimica et Cosmochimica Acta, vol. 284, p. 120–133, 2020. @article{Boulliung_etal2020,
title = {Oxygen fugacity and melt composition controls on nitrogen solubility in silicate melts},
author = {J. Boulliung and E. F\"{u}ri and C. Dalou and L. Tissandier and L. Zimmermann and Y. Marrocchi},
doi = {10.1016/j.gca.2020.06.020},
year = {2020},
date = {2020-01-01},
journal = {Geochimica et Cosmochimica Acta},
volume = {284},
pages = {120--133},
abstract = {Knowledge of N solubility in silicate melts is key for understanding the origin of terrestrial N and the distribution andexchanges of N between the atmosphere, the silicate magma ocean, and the core forming metal. To place constraints onthe incorporation mechanism(s) of N in silicate melts, we investigated the effect of the oxygen fugacity (fO2) and melt com-position on the N solubility through N equilibration experiments at atmospheric pressure and high temperature (1425textdegreeC).Oxygen fugacity (expressed in log units relative to the iron-wu ̈stite buffer, IW) was varied from IW --8 to IW +4.1, and meltcompositions covered a wide range of polymerization degrees, defined by the NBO/T ratio (the number of non-bridging oxy-gen atoms per tetrahedrally coordinated cations). The N contents of the quenched run products (silicate glasses) were ana-lyzed byin-situsecondary ion mass spectrometry and bulk CO2laser extraction static mass spectrometry, yielding resultsthat are in excellent agreement even for N concentrations at the (sub-)ppm level. The data obtained here highlight the fun-damental control offO2and the degree of polymerization of the silicate melt on N solubility. Under highly reduced conditions(fO2= IW --8), the N solubility increased with increasing NBO/T from 17.4 textpm 0.4 ppm.atm-1/2in highly polymerized melts(NBO/T = 0) to 6710 textpm 102 ppm.atm-1/2in depolymerized melts (NBO/T˜2.0). In contrast, under less reducing conditions(fO2\> IW --3.4), N solubility is very low (≤2 ppm.atm-1/2), irrespective of the NBO/T value. Our results provide constraintson N solubility in enstatite chondrite melts and in the shallow part of a planetary magma ocean. The nitrogen storage capacityof an enstatite chondrite melt, which may approximate that of planetesimals that accreted and melted early in the inner SolarSystem, varies between ˜60 and ˜6000 ppm at IW --5.1 and IW --8, respectively. In contrast, a mafic to ultra-mafic magmaocean could have incorporated ˜0.3 ppm to ˜35 ppm N under thefO2conditions inferred for the young Earth (i.e., IW --5 toIW). The N storage capacity of a reduced magma ocean (i.e., IW --3.4 to IW) in equilibrium with a N-rich atmosphere is ≤1 ppm, comparable to the N content of the present-day mantle. However under more reducing conditions (i.e., IW --5 toIW --4), the N storage capacity is significantly higher (˜35 ppm) ; in this case, Earth would have lost N to the atmosphereand/or N would have been transported into and stored within its deep interior (i.e., deep mantle, core).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Knowledge of N solubility in silicate melts is key for understanding the origin of terrestrial N and the distribution andexchanges of N between the atmosphere, the silicate magma ocean, and the core forming metal. To place constraints onthe incorporation mechanism(s) of N in silicate melts, we investigated the effect of the oxygen fugacity (fO2) and melt com-position on the N solubility through N equilibration experiments at atmospheric pressure and high temperature (1425textdegreeC).Oxygen fugacity (expressed in log units relative to the iron-wu ̈stite buffer, IW) was varied from IW --8 to IW +4.1, and meltcompositions covered a wide range of polymerization degrees, defined by the NBO/T ratio (the number of non-bridging oxy-gen atoms per tetrahedrally coordinated cations). The N contents of the quenched run products (silicate glasses) were ana-lyzed byin-situsecondary ion mass spectrometry and bulk CO2laser extraction static mass spectrometry, yielding resultsthat are in excellent agreement even for N concentrations at the (sub-)ppm level. The data obtained here highlight the fun-damental control offO2and the degree of polymerization of the silicate melt on N solubility. Under highly reduced conditions(fO2= IW --8), the N solubility increased with increasing NBO/T from 17.4 textpm 0.4 ppm.atm-1/2in highly polymerized melts(NBO/T = 0) to 6710 textpm 102 ppm.atm-1/2in depolymerized melts (NBO/T˜2.0). In contrast, under less reducing conditions(fO2> IW --3.4), N solubility is very low (≤2 ppm.atm-1/2), irrespective of the NBO/T value. Our results provide constraintson N solubility in enstatite chondrite melts and in the shallow part of a planetary magma ocean. The nitrogen storage capacityof an enstatite chondrite melt, which may approximate that of planetesimals that accreted and melted early in the inner SolarSystem, varies between ˜60 and ˜6000 ppm at IW --5.1 and IW --8, respectively. In contrast, a mafic to ultra-mafic magmaocean could have incorporated ˜0.3 ppm to ˜35 ppm N under thefO2conditions inferred for the young Earth (i.e., IW --5 toIW). The N storage capacity of a reduced magma ocean (i.e., IW --3.4 to IW) in equilibrium with a N-rich atmosphere is ≤1 ppm, comparable to the N content of the present-day mantle. However under more reducing conditions (i.e., IW --5 toIW --4), the N storage capacity is significantly higher (˜35 ppm) ; in this case, Earth would have lost N to the atmosphereand/or N would have been transported into and stored within its deep interior (i.e., deep mantle, core). |
Füri, E., Zimmermann, L., Deloule, E., Trappitsch, R. Cosmic ray effects on the isotope composition of hydrogen and noble gases in lunar samples: Insights from Apollo 12018 (Article de journal) Dans: Earth and Planetary Science Letters, vol. 550, p. 116550, 2020. @article{Fri_etal2020,
title = {Cosmic ray effects on the isotope composition of hydrogen and noble gases in lunar samples: Insights from Apollo 12018},
author = {E. F\"{u}ri and L. Zimmermann and E. Deloule and R. Trappitsch},
doi = {10.1016/j.epsl.2020.116550},
year = {2020},
date = {2020-01-01},
journal = {Earth and Planetary Science Letters},
volume = {550},
pages = {116550},
abstract = {Exposure of rocks and regolith to solar (SCR) and galactic cosmic rays (GCR) at the Moontextquoterights surface results in the production of textquoteleftcosmogenictextquoteright deuterium and noble gas nuclides at a rate that depends on a complex set of parameters, such as the energy spectrum and intensity of the cosmic ray flux, the chemical composition, size, and shape of the target as well as the shielding depth. As the effects of cosmic rays on the D production in lunar samples remain poorly understood, we determine here the D content and noble gas (He-Ne-Ar) characteristics of nominally anhydrous mineral (olivine and pyroxene) grains and rock fragments, respectively, from different documented depths (0 to �W4.8cm) within Apollo olivine basalt 12018. Deuterium concentrations, determined by secondary ion mass spectrometry, and cosmogenic 3He, 21Ne, and 38Ar abundances, measured by CO2laser extraction static mass spectrometry, are constant over the depth range investigated. Neon isotope ratios (20Ne/22Ne ≈0.86 and 21Ne/22Ne ≈0.85) of the cosmogenic endmember are comparable to the theoretical signature of GCR-produced neon. These observations indicate that the presence of significant amounts of SCR nuclides in the studied sub-samples can be ruled out. Hence, D within the olivines and pyroxenes must have been predominantly produced in situby GCR-induced spallation reactions during exposure at the lunar surface. Comparison of the amount of D with the 21Ne (184 textpm26Ma) or 38Ar (193 textpm25Ma) exposure ages yields a D production rate that is in good agreement with the value of (2.17 textpm0.11) texttimes10−12mol(grock)−1Ma−1from Füri et al. (2017). These results confirm that cosmic ray effects can substantially alter the hydrogen isotope (D/H) ratio of indigenous textquoteleftwatertextquoteright in returned extraterrestrial samples and meteorites with long exposure ages.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Exposure of rocks and regolith to solar (SCR) and galactic cosmic rays (GCR) at the Moontextquoterights surface results in the production of textquoteleftcosmogenictextquoteright deuterium and noble gas nuclides at a rate that depends on a complex set of parameters, such as the energy spectrum and intensity of the cosmic ray flux, the chemical composition, size, and shape of the target as well as the shielding depth. As the effects of cosmic rays on the D production in lunar samples remain poorly understood, we determine here the D content and noble gas (He-Ne-Ar) characteristics of nominally anhydrous mineral (olivine and pyroxene) grains and rock fragments, respectively, from different documented depths (0 to �W4.8cm) within Apollo olivine basalt 12018. Deuterium concentrations, determined by secondary ion mass spectrometry, and cosmogenic 3He, 21Ne, and 38Ar abundances, measured by CO2laser extraction static mass spectrometry, are constant over the depth range investigated. Neon isotope ratios (20Ne/22Ne ≈0.86 and 21Ne/22Ne ≈0.85) of the cosmogenic endmember are comparable to the theoretical signature of GCR-produced neon. These observations indicate that the presence of significant amounts of SCR nuclides in the studied sub-samples can be ruled out. Hence, D within the olivines and pyroxenes must have been predominantly produced in situby GCR-induced spallation reactions during exposure at the lunar surface. Comparison of the amount of D with the 21Ne (184 textpm26Ma) or 38Ar (193 textpm25Ma) exposure ages yields a D production rate that is in good agreement with the value of (2.17 textpm0.11) texttimes10−12mol(grock)−1Ma−1from Füri et al. (2017). These results confirm that cosmic ray effects can substantially alter the hydrogen isotope (D/H) ratio of indigenous textquoteleftwatertextquoteright in returned extraterrestrial samples and meteorites with long exposure ages. |
Sartégou, A., Blard, P. H., Braucher, R., Bourl`es, D. L., Sorriaux, P., Zimmermann, L., Laffitte, A., Tibari, B., Leanni, L., Guillou, V., Bourdet, A., team., ASTER Late Cenozoic evolution of the Ari`ege River valley (Pyrenees) constrained by cosmogenic 26Al/10Be and 10Be/21Ne dating of cave sediments (Article de journal) Dans: Geomorphology, vol. 371, p. 107441, 2020. @article{Sartgou_etal2020,
title = {Late Cenozoic evolution of the Ari`ege River valley (Pyrenees) constrained by cosmogenic 26Al/10Be and 10Be/21Ne dating of cave sediments},
author = {A. Sart\'{e}gou and P. H. Blard and R. Braucher and D. L. Bourl`es and P. Sorriaux and L. Zimmermann and A. Laffitte and B. Tibari and L. Leanni and V. Guillou and A. Bourdet and ASTER team.},
doi = {10.1016/j.geomorph.2020.107441},
year = {2020},
date = {2020-01-01},
journal = {Geomorphology},
volume = {371},
pages = {107441},
abstract = {Despite increasing knowledge on the orogenic phases of the Pyrenees, the Neogene evolution of the range remains poorly constrained. The central Pyrenees, particularly the Ari`ege River valley and its terrace systems and glacial extensions, are key to reconstructing Pyrenean evolution during the Neogene. However, fewterrace relics remain on the piedmont edges. To overcome this limitation and temporally extend the dataset obtained fromterraces, we focus on alluvium-filled horizontal epiphreatic passages developed in limestone karstic networks. These landforms record the transient position of former local base levels during the process of valley deepening, similar to fluvial terraces. The alluviumfills of the studied caves in the Tarascon-sur-Ari`ege area, in the transition zone between the upper range and the piedmont, therefore enable the reconstruction of the geodynamic evolution of the Ari`ege River valley. All studied caves are developed on at least eight levels. Based on burial durations determined by 26Al/10Be and 10Be/21Ne terrestrial cosmogenic nuclide dating of samples from epiphreatic levels, our results indicate Langhian to Messinian ( 13--5 Ma) incision rates averaging 48 m Myr−1. However, the obtained record does not allow us to accurately retrace the Pliocene evolution of the area due to the lack of known caves at corresponding levels. Moreover, raised local base levels during glacial phases both make the record more complex and call into question the methodological approach in terms of potential internal sediment remobilization and mixing related to implied re-flooding periods.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Despite increasing knowledge on the orogenic phases of the Pyrenees, the Neogene evolution of the range remains poorly constrained. The central Pyrenees, particularly the Ari`ege River valley and its terrace systems and glacial extensions, are key to reconstructing Pyrenean evolution during the Neogene. However, fewterrace relics remain on the piedmont edges. To overcome this limitation and temporally extend the dataset obtained fromterraces, we focus on alluvium-filled horizontal epiphreatic passages developed in limestone karstic networks. These landforms record the transient position of former local base levels during the process of valley deepening, similar to fluvial terraces. The alluviumfills of the studied caves in the Tarascon-sur-Ari`ege area, in the transition zone between the upper range and the piedmont, therefore enable the reconstruction of the geodynamic evolution of the Ari`ege River valley. All studied caves are developed on at least eight levels. Based on burial durations determined by 26Al/10Be and 10Be/21Ne terrestrial cosmogenic nuclide dating of samples from epiphreatic levels, our results indicate Langhian to Messinian ( 13--5 Ma) incision rates averaging 48 m Myr−1. However, the obtained record does not allow us to accurately retrace the Pliocene evolution of the area due to the lack of known caves at corresponding levels. Moreover, raised local base levels during glacial phases both make the record more complex and call into question the methodological approach in terms of potential internal sediment remobilization and mixing related to implied re-flooding periods. |
Zimmermann, L., Bekaert, D. Analyse des gaz rares par spectrométrie de masse statique ?Ĭ Mesures et applications (Article de journal) Dans: vol. J6637 V1, no. Techniques de ltextquoterightingénieur, 2020. @article{Zimmermann+Bekaert2020,
title = {Analyse des gaz rares par spectrom\'{e}trie de masse statique ?\u{I} Mesures et applications},
author = {L. Zimmermann and D. Bekaert},
year = {2020},
date = {2020-01-01},
volume = {J6637 V1},
number = {Techniques de ltextquoterighting\'{e}nieur},
abstract = {Cet article pr\'{e}sente les modes dtextquoterightacquisition des signaux des gaz rares enmono- et multi-collection en stextquoterightappuyant sur les configurations des spectrom`etres demasse de derni`ere g\'{e}n\'{e}ration. Un traitement des donn\'{e}es brutes, associ\'{e} `a descorrections dtextquoterightinterf\'{e}rences isobariques, est expliqu\'{e} pour ^etre en mesure de calculer la concentration et la composition isotopique dtextquoterightun gaz rare dans un \'{e}chantillon. Plusieurs applications stextquoterightappuyant sur la mesure des compositions \'{e}l\'{e}mentaires et isotopiques des gaz rares sont donn\'{e}es `a titre dtextquoterightexemples.This article presents the modes of acquisition of noble gas signals in mono- andmulti-collection based on the configurations of the latest generation of massspectrometers. A treatment of the raw data, associated with isobaric interferencecorrections, is explained to enable calculating a noble gas concentration and isotopic composition in a sample. Several applications based on the measurement of elemental and isotopic compositions of noble gases are given as examples.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Cet article présente les modes dtextquoterightacquisition des signaux des gaz rares enmono- et multi-collection en stextquoterightappuyant sur les configurations des spectrom`etres demasse de derni`ere génération. Un traitement des données brutes, associé `a descorrections dtextquoterightinterférences isobariques, est expliqué pour ^etre en mesure de calculer la concentration et la composition isotopique dtextquoterightun gaz rare dans un échantillon. Plusieurs applications stextquoterightappuyant sur la mesure des compositions élémentaires et isotopiques des gaz rares sont données `a titre dtextquoterightexemples.This article presents the modes of acquisition of noble gas signals in mono- andmulti-collection based on the configurations of the latest generation of massspectrometers. A treatment of the raw data, associated with isobaric interferencecorrections, is explained to enable calculating a noble gas concentration and isotopic composition in a sample. Several applications based on the measurement of elemental and isotopic compositions of noble gases are given as examples. |
Zimmermann, L., Bekaert, D. Analyse des gaz rares par spectrométrie de masse statique ?Ĭ Théorie et instrumentation (Article de journal) Dans: Techniques de ltextquoterightIngénieur, vol. J6636 V1, 2020. @article{Zimmermann+Bekaert2020_2,
title = {Analyse des gaz rares par spectrom\'{e}trie de masse statique ?\u{I} Th\'{e}orie et instrumentation},
author = {L. Zimmermann and D. Bekaert},
year = {2020},
date = {2020-01-01},
journal = {Techniques de ltextquoterightIng\'{e}nieur},
volume = {J6636 V1},
abstract = {R\'{e}sum\'{e} Cet article pr\'{e}sente la mesure des gaz rares par spectrom\'{e}trie de masse enmode statique. Une description d\'{e}taill\'{e}e des param`etres de source (aimantspermanents, tensions appliqu\'{e}es dans la source Nier, courant \'{e}lectronique et pression) a \'{e}t\'{e} faite pour mieux optimiser la sensibilit\'{e} de ces analyseurs. Le mouvement des ions dans le secteur magn\'{e}tique ainsi que leur d\'{e}tection ont \'{e}t\'{e} abord\'{e}s. Tous les points techniques ont \'{e}t\'{e} d\'{e}velopp\'{e}s `a partir de donn\'{e}es obtenues avec des spectrom`etres de masse de derni`ere g\'{e}n\'{e}ration.Abstract This article presents noble gas measurements by static mass spectrometry. `Adetailed description of the source settings (permanent magnets, voltage into the Nier source, trap current, total gas pressure) is presented in order to optimize the sensitivity of such mass spectrometers. The motion of ions into the magnetic field and their ultimate detection are discussed. All technical points have been developed from datasets previously obtained on state-of-the-art mass spectrometers},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Résumé Cet article présente la mesure des gaz rares par spectrométrie de masse enmode statique. Une description détaillée des param`etres de source (aimantspermanents, tensions appliquées dans la source Nier, courant électronique et pression) a été faite pour mieux optimiser la sensibilité de ces analyseurs. Le mouvement des ions dans le secteur magnétique ainsi que leur détection ont été abordés. Tous les points techniques ont été développés `a partir de données obtenues avec des spectrom`etres de masse de derni`ere génération.Abstract This article presents noble gas measurements by static mass spectrometry. `Adetailed description of the source settings (permanent magnets, voltage into the Nier source, trap current, total gas pressure) is presented in order to optimize the sensitivity of such mass spectrometers. The motion of ions into the magnetic field and their ultimate detection are discussed. All technical points have been developed from datasets previously obtained on state-of-the-art mass spectrometers |
2019
|
Balco, G., Blard, P. H., Shuster, D. L., Stone, J. O. H., Zimmermann, L. Cosmogenic and nucleogenic 21Ne in quartz in a 28-meter sandstone core from the McMurdo Dry Valleys, Antarctica (Article de journal) Dans: Quaternary Geochronology, vol. 52, p. 63–76, 2019. @article{Balco_etal2019,
title = {Cosmogenic and nucleogenic 21Ne in quartz in a 28-meter sandstone core from the McMurdo Dry Valleys, Antarctica},
author = {G. Balco and P. H. Blard and D. L. Shuster and J. O. H. Stone and L. Zimmermann},
doi = {10.1016/j.quageo.2019.02.006},
year = {2019},
date = {2019-01-01},
journal = {Quaternary Geochronology},
volume = {52},
pages = {63--76},
abstract = {We measured concentrations of Ne isotopes in quartz in a 27.6-m sandstone core from a low-erosion-rate site at 2183m elevation at Beacon Heights in the Antarctic Dry Valleys. Surface concentrations of cosmogenic 21Ne indicate a surface exposure age of at least 4.1 Ma and an erosion rate no higher than ca. 14 cm Myr−1 21Ne concentrations in the upper few centimeters of the core show evidence for secondary spallogenic neutron escape effects at the rock surface, which is predicted by first-principles models of cosmogenic-nuclide production but isnot commonly observed in natural examples. We used a model for 21Ne production by various mechanisms fit to the observations to distinguish cosmic-ray-produced 21Ne from nucleogenic 21Ne produced by decay of trace U and Th present in quartz, and also constrain rates of subsurface 21Ne production by cosmic-ray muons. Core samples have a quartz (U-Th)/Ne closure age, reflecting cooling below approximately 95 textdegreeC, near 160 Ma, which is consistent with existing apatite fission-track data and the 183 Ma emplacement of nearby Ferrar dolerite intrusions. Constraints on 21Ne production by muons derived from model fitting are consistent with a previously proposed value of 0.79 mb at 190 GeV for the cross-section for 21Ne production by fast muon interactions, but indicate that 21Ne production by negative muon capture is likely negligible.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We measured concentrations of Ne isotopes in quartz in a 27.6-m sandstone core from a low-erosion-rate site at 2183m elevation at Beacon Heights in the Antarctic Dry Valleys. Surface concentrations of cosmogenic 21Ne indicate a surface exposure age of at least 4.1 Ma and an erosion rate no higher than ca. 14 cm Myr−1 21Ne concentrations in the upper few centimeters of the core show evidence for secondary spallogenic neutron escape effects at the rock surface, which is predicted by first-principles models of cosmogenic-nuclide production but isnot commonly observed in natural examples. We used a model for 21Ne production by various mechanisms fit to the observations to distinguish cosmic-ray-produced 21Ne from nucleogenic 21Ne produced by decay of trace U and Th present in quartz, and also constrain rates of subsurface 21Ne production by cosmic-ray muons. Core samples have a quartz (U-Th)/Ne closure age, reflecting cooling below approximately 95 textdegreeC, near 160 Ma, which is consistent with existing apatite fission-track data and the 183 Ma emplacement of nearby Ferrar dolerite intrusions. Constraints on 21Ne production by muons derived from model fitting are consistent with a previously proposed value of 0.79 mb at 190 GeV for the cross-section for 21Ne production by fast muon interactions, but indicate that 21Ne production by negative muon capture is likely negligible. |
Zimmermann, L., Blard, P. H. Four `a induction tout métal `a haute température, destiné `a fondre des échantillons de minéraux et/ou de roches pour ltextquoterightextraction des gaz sous ultravide (brevet FR3056713) (Divers) 2019. @misc{Zimmermann+Blard2019,
title = {Four `a induction tout m\'{e}tal `a haute temp\'{e}rature, destin\'{e} `a fondre des \'{e}chantillons de min\'{e}raux et/ou de roches pour ltextquoterightextraction des gaz sous ultravide (brevet FR3056713)},
author = {L. Zimmermann and P. H. Blard},
year = {2019},
date = {2019-01-01},
keywords = {},
pubstate = {published},
tppubtype = {misc}
}
|
2018
|
Boucher, C., Marty, B., Zimmermann, L., Langenfelds, R. Atmospheric helium isotopic ratio from 1910 to 2016 recorded in stainless steel containers (Article de journal) Dans: Geochemical Perspectives Letters, vol. 6, p. 23–27, 2018. @article{Boucher_etal2018_2,
title = {Atmospheric helium isotopic ratio from 1910 to 2016 recorded in stainless steel containers},
author = {C. Boucher and B. Marty and L. Zimmermann and R. Langenfelds},
doi = {10.7185/geochemlet.1804},
year = {2018},
date = {2018-01-01},
journal = {Geochemical Perspectives Letters},
volume = {6},
pages = {23--27},
abstract = {The atmospheric helium isotope composition (RA=3He/4He air = 1.39 texttimes 10-6) could have varied over recent times due to anthropogenic activities. In order to check this possibility, we conducted high-precision helium isotope measurements of air trapped in various stainless steel containers from France (p\'{e}tanque balls, a float carburettor ; 1910--2016) and Cape Grim, Tasmania (archived air tanks ; 1978, 1988). We used a double collector mass spectrometer at the Centre de Recherches P\'{e}trographiques et G\'{e}ochimiques (CRPG, Nancy, France). We found a similar composition between the French and Cape Grim air samples. The temporal variation estimated from all samples including data previously published is not significant, with a trend of +0.002 textpm 0.024texttenthousand/yr over 106 years (2$sigma$). We suspect that the release of radiogenic 4He by fossil fuel exploitation could have been at least partly offset by the production of 3He (via the decay of 3H) from nuclear tests. This study supports the suitability of atmospheric helium as an inter-laboratory isotope standard.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The atmospheric helium isotope composition (RA=3He/4He air = 1.39 texttimes 10-6) could have varied over recent times due to anthropogenic activities. In order to check this possibility, we conducted high-precision helium isotope measurements of air trapped in various stainless steel containers from France (pétanque balls, a float carburettor ; 1910--2016) and Cape Grim, Tasmania (archived air tanks ; 1978, 1988). We used a double collector mass spectrometer at the Centre de Recherches Pétrographiques et Géochimiques (CRPG, Nancy, France). We found a similar composition between the French and Cape Grim air samples. The temporal variation estimated from all samples including data previously published is not significant, with a trend of +0.002 textpm 0.024texttenthousand/yr over 106 years (2$sigma$). We suspect that the release of radiogenic 4He by fossil fuel exploitation could have been at least partly offset by the production of 3He (via the decay of 3H) from nuclear tests. This study supports the suitability of atmospheric helium as an inter-laboratory isotope standard. |
Boucher, C., Tefang, L., Marty, B., Burnard, P. G., Fischer, T. P., Ayalew, D., Mabry, J., Moor, J. M., Zelenski, M. E., Zimmermann, L. Atmospheric helium isotope composition as a tracer of volcanic emissions: A case study of Erta Ale volcano, Ethiopia (Article de journal) Dans: Chemical Geology, vol. 480, p. 3–11, 2018. @article{Boucher_etal2018_3,
title = {Atmospheric helium isotope composition as a tracer of volcanic emissions: A case study of Erta Ale volcano, Ethiopia},
author = {C. Boucher and L. Tefang and B. Marty and P. G. Burnard and T. P. Fischer and D. Ayalew and J. Mabry and J. M. Moor and M. E. Zelenski and L. Zimmermann},
doi = {10.1016/j.chemgeo.2017.05.011},
year = {2018},
date = {2018-01-01},
journal = {Chemical Geology},
volume = {480},
pages = {3--11},
abstract = {The composition of atmospheric helium is generally considered to be constant (3He/4He = 1.39 texttimes 10− 6) on a large spatial scale. However, local variations may arise in tectonically active areas due to focussed degassing of one of its two isotopes, for example degassing of mantle-derived 3He or crustal-derived 4He. If detected, such variations have the potential to trace open conduit degassing of magmatic bodies and/or diffusive emissions from volcanic and/or crustal sources. Here, we test the possibility of detecting such variations in the Afar region of north-eastern Ethiopia, which is located over a well-developed rift system. Special attention was paid to the Erta Ale volcanic edifice, where both magma lake activity and strong degassing occur. We conducted high-precision 3He/4He ratio measurements of air samples from this region using an analytical facility at the Centre de Recherches P\'{e}trographiques et G\'{e}ochimiques (CRPG), Nancy (France) that was specially designed for high-precision noble gas analyses.Within the precision of our measurements (0.2--0.4%, 95% confidence interval), the helium isotopic compositions of air from both the Afar rift zone and the crater zone of Erta Ale are similar to the composition of air collected at Brabois Park in Villers-les-Nancy, France (labelled here as RBB). An additional air sample collected in a large tank (500 cm3) in Afar in 2015 permitted replicate analysis (n = 8) and improved precision. The 3He/4He ratio of this additional sample was also identical to RBB within 0.19% (95% confidence interval, CI). However, a clear excess of 3He (1.32 textpm 0.64%, 95% CI, relative to RBB based on a weighted mean of two samples) was detected in air collected above the active lava lake located in the central pit crater of Erta Ale volcano. Such excess requires a 3He flux of 0.15 textpm 0.09 mol/yr from the crater lava lake to be sustained. A similar 3He flux of 0.12 textpm 0.06 mol/yr is calculated from SO2 flux measurements and fumerolic gas data obtained during the same field trip. At several sites in the rim of the Northern crater, we conducted soil flux measurements using an accumulation chamber. Both the CO2 contents and the helium isotope ratios increased over time within the chamber, allowing us to evaluate the soil CO2 and 3He fluxes outside the lava lake area. These fluxes were found to be minor ( 1%) compared to the lava lake flux. The CO2/3He ratio of (3.1 textpm 0.7) texttimes 109 of soil gases is comparable to that of the high temperature (1084 textdegreeC) fumaroles sited in the north pit crater. Using this ratio and our estimated 3He flux, we determined a CO2 flux of 4.6 textpm 3.0 texttimes 108 mol/yr for the lava lake, which is about 105 times lower than the global volcanic subaerial CO2 flux. Based on this pilot study, we suggest that 3He excesses in air could provide another means with which to evaluate the fluxes of CO2 and other volatile species in specific environments, such as highly active volcanic areas.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The composition of atmospheric helium is generally considered to be constant (3He/4He = 1.39 texttimes 10− 6) on a large spatial scale. However, local variations may arise in tectonically active areas due to focussed degassing of one of its two isotopes, for example degassing of mantle-derived 3He or crustal-derived 4He. If detected, such variations have the potential to trace open conduit degassing of magmatic bodies and/or diffusive emissions from volcanic and/or crustal sources. Here, we test the possibility of detecting such variations in the Afar region of north-eastern Ethiopia, which is located over a well-developed rift system. Special attention was paid to the Erta Ale volcanic edifice, where both magma lake activity and strong degassing occur. We conducted high-precision 3He/4He ratio measurements of air samples from this region using an analytical facility at the Centre de Recherches Pétrographiques et Géochimiques (CRPG), Nancy (France) that was specially designed for high-precision noble gas analyses.Within the precision of our measurements (0.2--0.4%, 95% confidence interval), the helium isotopic compositions of air from both the Afar rift zone and the crater zone of Erta Ale are similar to the composition of air collected at Brabois Park in Villers-les-Nancy, France (labelled here as RBB). An additional air sample collected in a large tank (500 cm3) in Afar in 2015 permitted replicate analysis (n = 8) and improved precision. The 3He/4He ratio of this additional sample was also identical to RBB within 0.19% (95% confidence interval, CI). However, a clear excess of 3He (1.32 textpm 0.64%, 95% CI, relative to RBB based on a weighted mean of two samples) was detected in air collected above the active lava lake located in the central pit crater of Erta Ale volcano. Such excess requires a 3He flux of 0.15 textpm 0.09 mol/yr from the crater lava lake to be sustained. A similar 3He flux of 0.12 textpm 0.06 mol/yr is calculated from SO2 flux measurements and fumerolic gas data obtained during the same field trip. At several sites in the rim of the Northern crater, we conducted soil flux measurements using an accumulation chamber. Both the CO2 contents and the helium isotope ratios increased over time within the chamber, allowing us to evaluate the soil CO2 and 3He fluxes outside the lava lake area. These fluxes were found to be minor ( 1%) compared to the lava lake flux. The CO2/3He ratio of (3.1 textpm 0.7) texttimes 109 of soil gases is comparable to that of the high temperature (1084 textdegreeC) fumaroles sited in the north pit crater. Using this ratio and our estimated 3He flux, we determined a CO2 flux of 4.6 textpm 3.0 texttimes 108 mol/yr for the lava lake, which is about 105 times lower than the global volcanic subaerial CO2 flux. Based on this pilot study, we suggest that 3He excesses in air could provide another means with which to evaluate the fluxes of CO2 and other volatile species in specific environments, such as highly active volcanic areas. |
Füri, E., Zimmermann, L., Saal, A. E. Apollo 15 green glass He-Ne-Ar signatures -- In search for indigenous lunar noble gases (Article de journal) Dans: Geochemical Perspectives Letters, vol. 8, p. 1–5, 2018. @article{Fri_etal2018_2,
title = {Apollo 15 green glass He-Ne-Ar signatures -- In search for indigenous lunar noble gases},
author = {E. F\"{u}ri and L. Zimmermann and A. E. Saal},
doi = {10.7185/geochemlet.1819},
year = {2018},
date = {2018-01-01},
journal = {Geochemical Perspectives Letters},
volume = {8},
pages = {1--5},
abstract = {Identifying indigenous lunar noble gases in samples returned by the Apollo andLuna missions is highly challenging because contributions from the solar wind(SW) and/or cosmogenic nuclides have modified the noble gas signature of theregolith and rocks exposed to space at the lunar surface. Here we re-investigatethe possible presence of indigenous noble gases in pyroclastic Apollo 15426 greenglasses based on precise measurements of He-Ne-Ar isotopic compositions andabundances. The noble gas content of single glass beads varies by two orders ofmagnitude, indicating that they experienced highly variable irradiation historiesas a result of intense regolith stirring by impact gardening. Four out of the twelve spherules stand out by having the highest He-Ne-Ar abundances and by releasing an isotopically textquoteleftsolar-liketextquoteright noble gas component at high temperatures. While a contribution from indigenous noble gases cannot be ruled out, the data are best accounted for by inward diffusion of, and equilibration with, SW-derived volatiles during prolonged space exposure.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Identifying indigenous lunar noble gases in samples returned by the Apollo andLuna missions is highly challenging because contributions from the solar wind(SW) and/or cosmogenic nuclides have modified the noble gas signature of theregolith and rocks exposed to space at the lunar surface. Here we re-investigatethe possible presence of indigenous noble gases in pyroclastic Apollo 15426 greenglasses based on precise measurements of He-Ne-Ar isotopic compositions andabundances. The noble gas content of single glass beads varies by two orders ofmagnitude, indicating that they experienced highly variable irradiation historiesas a result of intense regolith stirring by impact gardening. Four out of the twelve spherules stand out by having the highest He-Ne-Ar abundances and by releasing an isotopically textquoteleftsolar-liketextquoteright noble gas component at high temperatures. While a contribution from indigenous noble gases cannot be ruled out, the data are best accounted for by inward diffusion of, and equilibration with, SW-derived volatiles during prolonged space exposure. |
Mollex, G., Füri, E., Burnard, P., Zimmermann, L., Chazot, G., Kazimoto, E. O., Marty, B., France, L. Tracing helium isotope compositions from mantle source to fumaroles at Oldoinyo Lengai volcano, Tanzania (Article de journal) Dans: Chemical Geology, vol. 480, p. 66–74, 2018. @article{Mollex_etal2018,
title = {Tracing helium isotope compositions from mantle source to fumaroles at Oldoinyo Lengai volcano, Tanzania},
author = {G. Mollex and E. F\"{u}ri and P. Burnard and L. Zimmermann and G. Chazot and E. O. Kazimoto and B. Marty and L. France},
doi = {10.1016/j.chemgeo.2017.08.015},
year = {2018},
date = {2018-01-01},
journal = {Chemical Geology},
volume = {480},
pages = {66--74},
abstract = {Oldoinyo Lengai is the only volcano on Earth currently erupting natrocarbonatites, of which the source and genesis remain controversial. Cognate xenoliths and fumaroles were sampled at the summit of Oldoinyo Lengai, and deep crustal xenoliths from Oltatwa maar, in 2010 and 2014, after the 2007--2008 sub-Plinian eruption. Thesummit cognate xenoliths provide direct information on the isotopic composition of the mid-crustal magma chamber that was active during the 2007--2008 explosive eruption. Cognate xenolith-hosted pyroxenes from Oldoinyo Lengai have an average 3He/4He =6.58 textpm 0.46 RA, similar to values from nearby silicate volcanoes(4.95--7.30 RA), and reflecting a sub-continental lithospheric mantle (SCLM) signature. This similarity implies that Oldoinyo Lengai carbonatites form from a similar mantle reservoir as the nearby silicate volcanoes. We identify SCLM, metasomatized by fluids/melts derived from the depleted convective mantle, as the common source of magmas in the Arusha volcanic province. Fumarole measurements highlight that fumarolic 3He/4He values have been relatively constant since at least 1988, indicating that dramatic changes to the crater region morphology during the 2007--2008 eruption did not affect the architecture of the hydrothermal system, which is probably connected to the crustal magma chamber(s). Moreover, the similarity between 3He/4He values from the mid-crustal magma chamber (6.58 textpm 0.46 RA) and fumaroles (7.31 textpm 0.24 RA) of Oldoinyo Lengai attests that helium is not subjected to atmospheric contamination or crustal assimilation during transport to the surface.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Oldoinyo Lengai is the only volcano on Earth currently erupting natrocarbonatites, of which the source and genesis remain controversial. Cognate xenoliths and fumaroles were sampled at the summit of Oldoinyo Lengai, and deep crustal xenoliths from Oltatwa maar, in 2010 and 2014, after the 2007--2008 sub-Plinian eruption. Thesummit cognate xenoliths provide direct information on the isotopic composition of the mid-crustal magma chamber that was active during the 2007--2008 explosive eruption. Cognate xenolith-hosted pyroxenes from Oldoinyo Lengai have an average 3He/4He =6.58 textpm 0.46 RA, similar to values from nearby silicate volcanoes(4.95--7.30 RA), and reflecting a sub-continental lithospheric mantle (SCLM) signature. This similarity implies that Oldoinyo Lengai carbonatites form from a similar mantle reservoir as the nearby silicate volcanoes. We identify SCLM, metasomatized by fluids/melts derived from the depleted convective mantle, as the common source of magmas in the Arusha volcanic province. Fumarole measurements highlight that fumarolic 3He/4He values have been relatively constant since at least 1988, indicating that dramatic changes to the crater region morphology during the 2007--2008 eruption did not affect the architecture of the hydrothermal system, which is probably connected to the crustal magma chamber(s). Moreover, the similarity between 3He/4He values from the mid-crustal magma chamber (6.58 textpm 0.46 RA) and fumaroles (7.31 textpm 0.24 RA) of Oldoinyo Lengai attests that helium is not subjected to atmospheric contamination or crustal assimilation during transport to the surface. |
Sartégou, A., Bourl`es, D. L., Blard, P. H., Braucher, R., Tibari, B., Zimmermann, L., Leanni, L., Team., ASTER, Auma^itre, G., Keddadouche, K. Deciphering landscape evolution with karstic networks: A Pyrenean case study (Article de journal) Dans: Quaternary Geochronology, vol. 43, p. 12–29, 2018. @article{Sartgou_etal2018,
title = {Deciphering landscape evolution with karstic networks: A Pyrenean case study},
author = {A. Sart\'{e}gou and D. L. Bourl`es and P. H. Blard and R. Braucher and B. Tibari and L. Zimmermann and L. Leanni and ASTER Team. and G. Auma^itre and K. Keddadouche},
doi = {10.1016/j.quageo.2017.09.005},
year = {2018},
date = {2018-01-01},
journal = {Quaternary Geochronology},
volume = {43},
pages = {12--29},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Zimmermann, L., Avice, G., Blard, P. H., Marty, B., Füri, E., Burnard, P. G. A new all-metal induction furnace for noble gas extraction (Article de journal) Dans: Chemical Geology, vol. 480, p. 86–92, 2018. @article{Zimmermann_etal2018,
title = {A new all-metal induction furnace for noble gas extraction},
author = {L. Zimmermann and G. Avice and P. H. Blard and B. Marty and E. F\"{u}ri and P. G. Burnard},
doi = {10.1016/j.chemgeo.2017.09.018},
year = {2018},
date = {2018-01-01},
journal = {Chemical Geology},
volume = {480},
pages = {86--92},
abstract = {A new all-metal induction furnace for extraction of all noble gases from pyroxenes, olivines, quartz or barites has been developed at CRPG. It differs in design from other induction furnaces in that the totality of the vacuum vessel is metallic and the induction coil, normally located outside the furnace, has been placed inside the vacuum vessel, with a special radio frequency power feedthrough welded onto a flange. The volume of the crucible is ≈15 cm3 and permits fusion of samples with a mass of up to 1 g. Samples are packed into a metal foil, loaded into a carousel, baked out before analysis, and then sequentially dropped into the Ta-crucible. The lowweight of the crucible (≈120 g) allows for short and efficient degassing cycles. When the furnace is pumped for the first time after samples loading, short cycles between 500 and 1800 textdegreeC at fast heating rates (≈400 textdegreeCtextperiodcenteredmin−1) are sufficient to achieve very low blanks. The durations of these cycles are range from 30 min for He to up to a few hours for Ne, Kr and Xe. Blanks of He, Kr and Xe (10 min heating durations) and Ne (20 min) in static vacuum are (1.6 textpm 1.0)texttimes10−15 mol 4He (T=1750 textdegreeC), (5.8 textpm 2.3)texttimes10−17 mol 20Ne (T=1500 textdegreeC), (2.1 textpm 0.3)texttimes10−18 mol 84Kr (T=1700 textdegreeC) and (4.4 textpm 0.4)texttimes10−18 mol 132Xe (T=1700 textdegreeC). Argon blanks have not yet been measured.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A new all-metal induction furnace for extraction of all noble gases from pyroxenes, olivines, quartz or barites has been developed at CRPG. It differs in design from other induction furnaces in that the totality of the vacuum vessel is metallic and the induction coil, normally located outside the furnace, has been placed inside the vacuum vessel, with a special radio frequency power feedthrough welded onto a flange. The volume of the crucible is ≈15 cm3 and permits fusion of samples with a mass of up to 1 g. Samples are packed into a metal foil, loaded into a carousel, baked out before analysis, and then sequentially dropped into the Ta-crucible. The lowweight of the crucible (≈120 g) allows for short and efficient degassing cycles. When the furnace is pumped for the first time after samples loading, short cycles between 500 and 1800 textdegreeC at fast heating rates (≈400 textdegreeCtextperiodcenteredmin−1) are sufficient to achieve very low blanks. The durations of these cycles are range from 30 min for He to up to a few hours for Ne, Kr and Xe. Blanks of He, Kr and Xe (10 min heating durations) and Ne (20 min) in static vacuum are (1.6 textpm 1.0)texttimes10−15 mol 4He (T=1750 textdegreeC), (5.8 textpm 2.3)texttimes10−17 mol 20Ne (T=1500 textdegreeC), (2.1 textpm 0.3)texttimes10−18 mol 84Kr (T=1700 textdegreeC) and (4.4 textpm 0.4)texttimes10−18 mol 132Xe (T=1700 textdegreeC). Argon blanks have not yet been measured. |
2016
|
Li, Y., Marty, B., Shcheka, S., Zimmermann, L., Keppler, H. Nitrogen isotope fractionation during terrestrial core-mantle separation (Article de journal) Dans: Geochemical Perspectives Letters, vol. 2, p. 138–147, 2016. @article{Li_etal2016,
title = {Nitrogen isotope fractionation during terrestrial core-mantle separation},
author = {Y. Li and B. Marty and S. Shcheka and L. Zimmermann and H. Keppler},
doi = {10.7185/geochemlet.1614},
year = {2016},
date = {2016-01-01},
journal = {Geochemical Perspectives Letters},
volume = {2},
pages = {138--147},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2015
|
Avice, G., Meir, M., Marty, B., Wieler, R., Kramers, J. D., Langenhorst, F., Cartigny, P., Maden, C., Zimmermann, L., Andreoli, M. A. G A comprehensive study of noble gases and nitrogen in textquotelefttextquoteleftHypatiatextquoterighttextquoteright, a diamond-rich pebble from SW Egypt (Article de journal) Dans: Earth and Planetary Science Letters, vol. 432, p. 243–253, 2015. @article{Avice_etal2015,
title = {A comprehensive study of noble gases and nitrogen in textquotelefttextquoteleftHypatiatextquoterighttextquoteright, a diamond-rich pebble from SW Egypt},
author = {G. Avice and M. Meir and B. Marty and R. Wieler and J. D. Kramers and F. Langenhorst and P. Cartigny and C. Maden and L. Zimmermann and M. A. G Andreoli},
doi = {10.1016/j.epsl.2015.10.013},
year = {2015},
date = {2015-01-01},
journal = {Earth and Planetary Science Letters},
volume = {432},
pages = {243--253},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Blard, P. H., Balco, G., Burnard, P. G., Farley, K., Fenton, C. R., Friedrich, R., Jull, A. J. T., Niedermann, S., Pik, R., Schaefer, J. M., Scott, E. M., Shuster, D. L., Stuart, F. M., Stute, M., Tibari, B., Winckler, G., Zimmermann, L. An inter-laboratory comparison of cosmogenic 3 He and radiogenic 4 He in the CRONUS-P pyroxene standard (Article de journal) Dans: Quaternary Geochronology, vol. 26, p. 11–19, 2015. @article{Blard_etal2015,
title = {An inter-laboratory comparison of cosmogenic 3 He and radiogenic 4 He in the CRONUS-P pyroxene standard},
author = {P. H. Blard and G. Balco and P. G. Burnard and K. Farley and C. R. Fenton and R. Friedrich and A. J. T. Jull and S. Niedermann and R. Pik and J. M. Schaefer and E. M. Scott and D. L. Shuster and F. M. Stuart and M. Stute and B. Tibari and G. Winckler and L. Zimmermann},
doi = {http://dx.do10.1016/j.quageo.2014.08.004},
year = {2015},
date = {2015-01-01},
journal = {Quaternary Geochronology},
volume = {26},
pages = {11--19},
abstract = {This study reports an inter-laboratory comparison of the 3 He and 4 He concentrations measured in the pyroxene material CRONUS-P. This forms part of the CRONUS-Earth and CRONUS-EU programs, which also produced a series of natural reference materials for in situ produced 26Al,10Be,14C,21Ne and 36Cl.Six laboratories (GFZ Potsdam, Caltech Pasadena, CRPG Nancy, SUERC Glasgow, BGC Berkeley, Lamont New York) participated in this intercomparison experiment, analyzing between 5 and 22 aliquots each. Intra-laboratory results yield 3He concentrations that are consistent with the reported analytical uncertainties, which suggests that 3He is homogeneous within CRONUS-P. The inter-laboratory dataset (66 determinations from the 6 different labs) is characterized by a global weighted mean of(5.02textpm0.12)x109at g-1 with an overdispersion of 5.6% (2s).4He is characterized by a larger variability than 3He, and by an inter-lab global weighted mean of (3.60textpm0.18)x1013 at g-1(2s) with an overdispersion of 10.4% (2s).There are, however, some systematic differences between the six laboratories. More precisely, 2 laboratories obtained mean 3He concentrations that are about 6%higher than the clustered other 4 laboratories. This systematic bias is larger than the analytical uncertainty and not related to the CRONUS-P material (see Schaefer et al., 2015). Reasons for these inter-laboratory offsets are difficult to identify but are discussed below. To improve the precision of cosmogenic 3He dating, we suggest that future studies presenting cosmogenic 3He results also report the3He concentration measured in the CRONUS-P material in the lab(s) used in a given study},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This study reports an inter-laboratory comparison of the 3 He and 4 He concentrations measured in the pyroxene material CRONUS-P. This forms part of the CRONUS-Earth and CRONUS-EU programs, which also produced a series of natural reference materials for in situ produced 26Al,10Be,14C,21Ne and 36Cl.Six laboratories (GFZ Potsdam, Caltech Pasadena, CRPG Nancy, SUERC Glasgow, BGC Berkeley, Lamont New York) participated in this intercomparison experiment, analyzing between 5 and 22 aliquots each. Intra-laboratory results yield 3He concentrations that are consistent with the reported analytical uncertainties, which suggests that 3He is homogeneous within CRONUS-P. The inter-laboratory dataset (66 determinations from the 6 different labs) is characterized by a global weighted mean of(5.02textpm0.12)x109at g-1 with an overdispersion of 5.6% (2s).4He is characterized by a larger variability than 3He, and by an inter-lab global weighted mean of (3.60textpm0.18)x1013 at g-1(2s) with an overdispersion of 10.4% (2s).There are, however, some systematic differences between the six laboratories. More precisely, 2 laboratories obtained mean 3He concentrations that are about 6%higher than the clustered other 4 laboratories. This systematic bias is larger than the analytical uncertainty and not related to the CRONUS-P material (see Schaefer et al., 2015). Reasons for these inter-laboratory offsets are difficult to identify but are discussed below. To improve the precision of cosmogenic 3He dating, we suggest that future studies presenting cosmogenic 3He results also report the3He concentration measured in the CRONUS-P material in the lab(s) used in a given study |
Vermeesch, P. Pieter, Balco, G., Blard, P. H., Dunai, T. J., Kober, F., Niedermann, S., Shuster, D. L., Strasky, S., Stuart, F. M., Wieler, R., Zimmermann, L. Interlaboratory comparison of cosmogenic 21 Ne in quartz (Article de journal) Dans: Quaternary Geochronology, vol. 26, p. 20–28, 2015. @article{PieterVermeesch_etal2015,
title = {Interlaboratory comparison of cosmogenic 21 Ne in quartz},
author = {P. Pieter Vermeesch and G. Balco and P. H. Blard and T. J. Dunai and F. Kober and S. Niedermann and D. L. Shuster and S. Strasky and F. M. Stuart and R. Wieler and L. Zimmermann},
doi = {10.1016/j.quageo.2012.11.009},
year = {2015},
date = {2015-01-01},
journal = {Quaternary Geochronology},
volume = {26},
pages = {20--28},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Zimmermann, L., Füri, E. Purification des gaz rares sous ultravide ?Ĭ Enceinte de purification (Article de journal) Dans: Techniques de ltextquoterightIngénieur, vol. j6634, 2015. @article{Zimmermann+Fri2015,
title = {Purification des gaz rares sous ultravide ?\u{I} Enceinte de purification},
author = {L. Zimmermann and E. F\"{u}ri},
year = {2015},
date = {2015-01-01},
journal = {Techniques de ltextquoterightIng\'{e}nieur},
volume = {j6634},
abstract = {Les gaz rares forment ltextquoterightensemble des \'{e}l\'{e}ments chimiques class\'{e}s dans le groupe 18 du tableau p\'{e}riodique. Ils sont au nombre de 7, `a savoir ltextquoterighth\'{e}lium, le n\'{e}on, ltextquoterightargon, le krypton, le x\'{e}non, le radon et ltextquoterightununoctium de symboles respectifs He, Ne, Ar, Kr, Xe, Rn et Uuo. Seuls les cinq premiers \'{e}l\'{e}ments de ce groupe sont \'{e}voqu\'{e}s en d\'{e}tail pour permettre aux lecteurs de mieux comprendre les processus physico-chimiques aboutissant, apr`es leur extraction par broyage, fusion, ou ablation dtextquoterightun \'{e}chantillon g\'{e}ologique, `a leur purification dans une enceinte sous ultravide (UHV). Il ntextquoterightest pas fait \'{e}tat dans cet article de commentaires sp\'{e}cifiques sur le radon, qui est produit par la d\'{e}sint\'{e}gration radioactive du radium et dont les applications en g\'{e}osciences sont tr`es limit\'{e}es, ni dtextquoterightailleurs sur ltextquoterightununoctium qui est un \'{e}l\'{e}ment purement synth\'{e}tique, produit dans certains laboratoires de physique sp\'{e}cialis\'{e}s en recherche fondamentale.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Les gaz rares forment ltextquoterightensemble des éléments chimiques classés dans le groupe 18 du tableau périodique. Ils sont au nombre de 7, `a savoir ltextquoterighthélium, le néon, ltextquoterightargon, le krypton, le xénon, le radon et ltextquoterightununoctium de symboles respectifs He, Ne, Ar, Kr, Xe, Rn et Uuo. Seuls les cinq premiers éléments de ce groupe sont évoqués en détail pour permettre aux lecteurs de mieux comprendre les processus physico-chimiques aboutissant, apr`es leur extraction par broyage, fusion, ou ablation dtextquoterightun échantillon géologique, `a leur purification dans une enceinte sous ultravide (UHV). Il ntextquoterightest pas fait état dans cet article de commentaires spécifiques sur le radon, qui est produit par la désintégration radioactive du radium et dont les applications en géosciences sont tr`es limitées, ni dtextquoterightailleurs sur ltextquoterightununoctium qui est un élément purement synthétique, produit dans certains laboratoires de physique spécialisés en recherche fondamentale. |
Zimmermann, L., Füri, E., Burnard, P. Purification des gaz rares sous ultravide ?Ĭ Méthodes de purification (Article de journal) Dans: Techniques de ltextquoterightIngénieur, vol. J6 635, 2015. @article{Zimmermann_etal2015,
title = {Purification des gaz rares sous ultravide ?\u{I} M\'{e}thodes de purification},
author = {L. Zimmermann and E. F\"{u}ri and P. Burnard},
year = {2015},
date = {2015-01-01},
journal = {Techniques de ltextquoterightIng\'{e}nieur},
volume = {J6 635},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2014
|
Zimmermann, L., Marty, B. Méthodes dtextquoterightextraction des gaz rares sous ultravide (Article de journal) Dans: Techniques de ltextquoterightingénieur, vol. j6632, 2014. @article{Zimmermann+Marty2014,
title = {M\'{e}thodes dtextquoterightextraction des gaz rares sous ultravide},
author = {L. Zimmermann and B. Marty},
year = {2014},
date = {2014-01-01},
journal = {Techniques de ltextquoterighting\'{e}nieur},
volume = {j6632},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2013
|
Füri, E., Aléon, J., Toppani, A., Marty, B., Libourel, G., Zimmermann, L. Effects of atmospheric entry heating on the noble gas and nitrogen content of micrometeorites (Article de journal) Dans: Earth and Planetary Science Letters, vol. 377-378, p. 1–12, 2013. @article{Fri_etal2013,
title = {Effects of atmospheric entry heating on the noble gas and nitrogen content of micrometeorites},
author = {E. F\"{u}ri and J. Al\'{e}on and A. Toppani and B. Marty and G. Libourel and L. Zimmermann},
doi = {10.1016/j.epsl.2013.07.031},
year = {2013},
date = {2013-01-01},
journal = {Earth and Planetary Science Letters},
volume = {377-378},
pages = {1--12},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Marty, B., Zimmermann, L., Pujol, M., Burgess, R., Philippot, P. Nitrogen isotopic composition and density of the Archean atmosphere (Article de journal) Dans: Sciencexpress, no. 9, 2013. @article{Marty_etal2013_2,
title = {Nitrogen isotopic composition and density of the Archean atmosphere},
author = {B. Marty and L. Zimmermann and M. Pujol and R. Burgess and P. Philippot},
doi = {10.1126/science.1240971},
year = {2013},
date = {2013-01-01},
journal = {Sciencexpress},
number = {9},
abstract = {Understanding the atmospheretextquoterights composition during the Archean eon is a fundamental issue to unravel ancient environmental conditions. We show from the analysis of nitrogen and argon isotopes in fluid inclusions trapped in 3.0-3.5 Ga hydrothermal quartz that the PN2 of the Archean atmosphere was lower than 1.1 bar, possibly as low as 0.5 bar, and had a nitrogen isotopic composition comparable to the present-day one. These results imply that dinitrogen did not play a significant role in the thermal budget of the ancient Earth and that the Archean PCO2 was probably lower than 0.7 bar.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Understanding the atmospheretextquoterights composition during the Archean eon is a fundamental issue to unravel ancient environmental conditions. We show from the analysis of nitrogen and argon isotopes in fluid inclusions trapped in 3.0-3.5 Ga hydrothermal quartz that the PN2 of the Archean atmosphere was lower than 1.1 bar, possibly as low as 0.5 bar, and had a nitrogen isotopic composition comparable to the present-day one. These results imply that dinitrogen did not play a significant role in the thermal budget of the ancient Earth and that the Archean PCO2 was probably lower than 0.7 bar. |
Zelenski, M. E., Fischer, T. P., Moor, Maarten, Marty, B., Zimmermann, L., Ayalew, D., Nekrasov, A., Karandashev, V. K. Trace elements in the gas emissions from the Erta Ale volcano, Afar, Ethiopia (Article de journal) Dans: Chemical Geology, vol. 357, p. 95–116, 2013. @article{Zelenski_etal2013,
title = {Trace elements in the gas emissions from the Erta Ale volcano, Afar, Ethiopia},
author = {M. E. Zelenski and T. P. Fischer and Maarten Moor and B. Marty and L. Zimmermann and D. Ayalew and A. Nekrasov and V. K. Karandashev},
doi = {10.1016/j.chemgeo.2013.08.022},
year = {2013},
date = {2013-01-01},
journal = {Chemical Geology},
volume = {357},
pages = {95--116},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Zimmermann, L. Four et procédé dtextquoterightextraction par diffusion de ltextquoterighthélium présent dans des minéraux (Divers) 2013. @misc{Zimmermann2013,
title = {Four et proc\'{e}d\'{e} dtextquoterightextraction par diffusion de ltextquoterighth\'{e}lium pr\'{e}sent dans des min\'{e}raux},
author = {L. Zimmermann},
year = {2013},
date = {2013-01-01},
keywords = {},
pubstate = {published},
tppubtype = {misc}
}
|
2012
|
Mabry, J., Burnard, P., Blard, P. H., Zimmermann, L. Mapping changes in helium sensitivity and peak shape for varying parameters of a Nier-type noble gas ion source (Article de journal) Dans: Journal of Analytical Atomic Spectrometry, vol. 27, p. 1012–1017, 2012. @article{Mabry_etal2012,
title = {Mapping changes in helium sensitivity and peak shape for varying parameters of a Nier-type noble gas ion source},
author = {J. Mabry and P. Burnard and P. H. Blard and L. Zimmermann},
doi = {10.1039/C2JA10339G},
year = {2012},
date = {2012-01-01},
journal = {Journal of Analytical Atomic Spectrometry},
volume = {27},
pages = {1012--1017},
abstract = {Tuning a Nier-type ion source involves adjusting many different parameters which affect the resulting signal in complicated ways. We have mapped the sensitivity of 4He and the peak shape while varying the total extraction voltage, the half-plate bias, the repeller voltage, and the electron energy. With the particular source settings that we used, we see an asymmetric rise and fall in the sensitivity as theextraction is raised, but a symmetric rise and fall as the half-plate bias voltage is varied. The best peak shape is found generally at the same extraction value of the maximum sensitivity, but at a distinctly different half-plate bias than the maximum sensitivity; thus it is necessary to monitor the peak shape while tuning the half-plate bias. The extraction and the repeller values of the maximum sensitivity and the best peak shape are strongly correlated, and therefore these two parameters must be tuned together. And finally, we see a double-peak in the sensitivity as the electron voltage is increased, so it may be worthwhile to check a wide range of electron voltages when tuning.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Tuning a Nier-type ion source involves adjusting many different parameters which affect the resulting signal in complicated ways. We have mapped the sensitivity of 4He and the peak shape while varying the total extraction voltage, the half-plate bias, the repeller voltage, and the electron energy. With the particular source settings that we used, we see an asymmetric rise and fall in the sensitivity as theextraction is raised, but a symmetric rise and fall as the half-plate bias voltage is varied. The best peak shape is found generally at the same extraction value of the maximum sensitivity, but at a distinctly different half-plate bias than the maximum sensitivity; thus it is necessary to monitor the peak shape while tuning the half-plate bias. The extraction and the repeller values of the maximum sensitivity and the best peak shape are strongly correlated, and therefore these two parameters must be tuned together. And finally, we see a double-peak in the sensitivity as the electron voltage is increased, so it may be worthwhile to check a wide range of electron voltages when tuning. |
Zimmermann, L., Blard, P. H., Burnard, P., Medynski, S., Pik, R., Puchol, N. A New Single Vacuum Furnace Design for Cosmogenic 3He Dating (Article de journal) Dans: Geostandards and Geoanalytical Research, p. 1–9, 2012. @article{Zimmermann_etal2012,
title = {A New Single Vacuum Furnace Design for Cosmogenic 3He Dating},
author = {L. Zimmermann and P. H. Blard and P. Burnard and S. Medynski and R. Pik and N. Puchol},
doi = {10.1111/j.1751-908X.2011.00145.x},
year = {2012},
date = {2012-01-01},
journal = {Geostandards and Geoanalytical Research},
pages = {1--9},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2010
|
Marty, B., Zimmermann, L., Burnard, P., Wieler, R., Heber, V. S., Burnett, D. L., Wiens, R. G., Bochsler, P. Nitrogen isotopes in the recent solar wind from the analysis of Genesis targets: Evidence for large scale isotope heterogeneity in the early solar system (Article de journal) Dans: Geochimica et Cosmochimica Acta, vol. 74, p. 340–355, 2010. @article{Marty_etal2010_2,
title = {Nitrogen isotopes in the recent solar wind from the analysis of Genesis targets: Evidence for large scale isotope heterogeneity in the early solar system},
author = {B. Marty and L. Zimmermann and P. Burnard and R. Wieler and V. S. Heber and D. L. Burnett and R. G. Wiens and P. Bochsler},
doi = {10.1016/j.gca.2009.09.007},
year = {2010},
date = {2010-01-01},
journal = {Geochimica et Cosmochimica Acta},
volume = {74},
pages = {340--355},
abstract = {We have analyzed nitrogen, neon and argon abundances and isotopic ratios in target material exposed in space for 27 months to solar wind (SW) irradiation during the Genesis mission. SW ions were extracted by sequential UV (193 nm) laser ablation of gold-plated material, purified separately in a dedicated line, and analyzed by gas source static mass spectrometry. We analyzed gold-covered stainless steel pieces from the Concentrator, a device that concentrated SW ions by a factor of up to 50. Despite extensive terrestrial N contamination, we could identify a non-terrestrial, N-15-depleted nitrogen end-member that points to a 40% depletion of 15 N in solar-wind N relative to inner planets and meteorites, and define a composition for the present-day Sun (N-15/N-14 = [2.26 +/- 0.67] X 10(-3) 2 sigma), which is indistinguishable from that of Jupitertextquoterights atmosphere. These results indicate that the isotopic composition of nitrogen in the outer convective zone of the Sun has not changed through time, and is representative of the protosolar nebula. Large N-15 enrichments due to e.g., irradiation, low temperature isotopic exchange, or contributions from N-15-rich presolar components, are therefore required to account for inner planet values},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have analyzed nitrogen, neon and argon abundances and isotopic ratios in target material exposed in space for 27 months to solar wind (SW) irradiation during the Genesis mission. SW ions were extracted by sequential UV (193 nm) laser ablation of gold-plated material, purified separately in a dedicated line, and analyzed by gas source static mass spectrometry. We analyzed gold-covered stainless steel pieces from the Concentrator, a device that concentrated SW ions by a factor of up to 50. Despite extensive terrestrial N contamination, we could identify a non-terrestrial, N-15-depleted nitrogen end-member that points to a 40% depletion of 15 N in solar-wind N relative to inner planets and meteorites, and define a composition for the present-day Sun (N-15/N-14 = [2.26 +/- 0.67] X 10(-3) 2 sigma), which is indistinguishable from that of Jupitertextquoterights atmosphere. These results indicate that the isotopic composition of nitrogen in the outer convective zone of the Sun has not changed through time, and is representative of the protosolar nebula. Large N-15 enrichments due to e.g., irradiation, low temperature isotopic exchange, or contributions from N-15-rich presolar components, are therefore required to account for inner planet values |
2009
|
Marrocchi, Y., Burnard, P., Hamilton, D., Colin, A., Pujol, M., Zimmermann, L., Marty, B. Neon isotopic measurements using high-resolution, multicollector noble gas mass spectrometer: HELIX-MC (Article de journal) Dans: Geochemistry, Geophysics, Geosystems G3, vol. 10, no. 4, p. 1–8, 2009. @article{Marrocchi_etal2009,
title = {Neon isotopic measurements using high-resolution, multicollector noble gas mass spectrometer: HELIX-MC},
author = {Y. Marrocchi and P. Burnard and D. Hamilton and A. Colin and M. Pujol and L. Zimmermann and B. Marty},
doi = {10.1029/2008GC002339},
year = {2009},
date = {2009-01-01},
journal = {Geochemistry, Geophysics, Geosystems G3},
volume = {10},
number = {4},
pages = {1--8},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Zimmermann, L., Burnard, P., Marty, B., Gaboriaud, F. Laser Ablation (193 nm), Purification and Determination of Very Low Concentrations of Solar Wind Nitrogen Implanted in Targets from the GENESIS Spacecraft (Article de journal) Dans: Geostandards and Geoanalytical Research, vol. 33, no. 2, p. 183–194, 2009. @article{Zimmermann_etal2009,
title = {Laser Ablation (193 nm), Purification and Determination of Very Low Concentrations of Solar Wind Nitrogen Implanted in Targets from the GENESIS Spacecraft},
author = {L. Zimmermann and P. Burnard and B. Marty and F. Gaboriaud},
doi = {10.1111/j.1751-908X.2009.00021.x},
year = {2009},
date = {2009-01-01},
journal = {Geostandards and Geoanalytical Research},
volume = {33},
number = {2},
pages = {183--194},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2008
|
Marty, B., Palma, R., Pepin, R. O., Zimmermann, L., Schlutter, D., Burnard, P., Westphal, A., Snead, C. J., Bajt, S., Becker, R. H., Simones, J. E. Helium and neon abundances and compositions in cometary matter (Article de journal) Dans: Science, vol. 319, no. 5859, p. 75–78, 2008. @article{Marty_etal2008,
title = {Helium and neon abundances and compositions in cometary matter},
author = {B. Marty and R. Palma and R. O. Pepin and L. Zimmermann and D. Schlutter and P. Burnard and A. Westphal and C. J. Snead and S. Bajt and R. H. Becker and J. E. Simones},
doi = {10.1126/science.1148001},
year = {2008},
date = {2008-01-01},
journal = {Science},
volume = {319},
number = {5859},
pages = {75--78},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2006
|
McKeegan, K. D., Aleon, J., Bradley, J., Brownlee, D., Busemann, H., Butterworth, A., Chaussidon, M., Fallon, S., Floss, C., Gilmour, J., Gounelle, M., Graham, G., Guan, Y. B., Heck, P. R., Hoppe, P., Hutcheon, I. D., Huth, J., Ishii, H., Ito, M., Jacobsen, S. B., Kearsley, A., Leshin, L. A., Liu, M. C., Lyon, I., Marhas, K., Marty, B., Matrajt, G., Meibom, A., Messenger, S., Mostefaoui, S., Mukhopadhyay, S., Nakamura-Messenger, K., Nittler, L., Palma, R., Pepin, R. O., Papanastassiou, D. A., Robert, F., Schlutter, D., Snead, C. J., Stadermann, F. J., Stroud, R., Tsou, P., Westphal, A., Young, E. D., Ziegler, K., Zimmermann, L., Zinner, E. Isotopic compositions of cometary matter returned by Stardust (Article de journal) Dans: Science, vol. 314, no. 5806, p. 1724–1728, 2006. @article{McKeegan_etal2006,
title = {Isotopic compositions of cometary matter returned by Stardust},
author = {K. D. McKeegan and J. Aleon and J. Bradley and D. Brownlee and H. Busemann and A. Butterworth and M. Chaussidon and S. Fallon and C. Floss and J. Gilmour and M. Gounelle and G. Graham and Y. B. Guan and P. R. Heck and P. Hoppe and I. D. Hutcheon and J. Huth and H. Ishii and M. Ito and S. B. Jacobsen and A. Kearsley and L. A. Leshin and M. C. Liu and I. Lyon and K. Marhas and B. Marty and G. Matrajt and A. Meibom and S. Messenger and S. Mostefaoui and S. Mukhopadhyay and K. Nakamura-Messenger and L. Nittler and R. Palma and R. O. Pepin and D. A. Papanastassiou and F. Robert and D. Schlutter and C. J. Snead and F. J. Stadermann and R. Stroud and P. Tsou and A. Westphal and E. D. Young and K. Ziegler and L. Zimmermann and E. Zinner},
doi = {10.1126/science.1135992},
year = {2006},
date = {2006-01-01},
journal = {Science},
volume = {314},
number = {5806},
pages = {1724--1728},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2005
|
Marty, B., Robert, P., Zimmermann, L. Nitrogen and noble gases in micrometeorites (Article de journal) Dans: Meteoritics & Planetary Science, vol. 40, no. 6, p. 881–894, 2005. @article{Marty_etal2005,
title = {Nitrogen and noble gases in micrometeorites},
author = {B. Marty and P. Robert and L. Zimmermann},
year = {2005},
date = {2005-01-01},
journal = {Meteoritics \& Planetary Science},
volume = {40},
number = {6},
pages = {881--894},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2003
|
Mathew, K. J., Marty, B., Marti, K., Zimmermann, L. Volatiles (nitrogen, noble gases) in recently discovered SNC meteorites, extinct radioactivities and evolution (Article de journal) Dans: Earth and Planetary Science Letters, vol. 214, no. 1-2, p. 27–42, 2003. @article{Mathew_etal2003,
title = {Volatiles (nitrogen, noble gases) in recently discovered SNC meteorites, extinct radioactivities and evolution},
author = {K. J. Mathew and B. Marty and K. Marti and L. Zimmermann},
doi = {10.1016/S0012-821X(03)00365-0},
year = {2003},
date = {2003-01-01},
journal = {Earth and Planetary Science Letters},
volume = {214},
number = {1-2},
pages = {27--42},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2000
|
Humbert, F., Libourel, G., France-Lanord, C., Zimmermann, L., Marty, B. CO2-laser extraction-static mass spectrometry analysis of ultra-low concentrations of nitrogen in silicates (Article de journal) Dans: Geostandards Newsletter, vol. 24, no. 2, p. 255–260, 2000. @article{Humbert_etal2000,
title = {CO2-laser extraction-static mass spectrometry analysis of ultra-low concentrations of nitrogen in silicates},
author = {F. Humbert and G. Libourel and C. France-Lanord and L. Zimmermann and B. Marty},
doi = {10.1111/j.1751-908X.2000.tb00777.x},
year = {2000},
date = {2000-01-01},
journal = {Geostandards Newsletter},
volume = {24},
number = {2},
pages = {255--260},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
1999
|
Marty, B., Zimmermann, L. Volatiles (He, C, N, Ar) in mid-ocean ridge basalts : assessment of shallow-level fractionation and characterization of source composition (Article de journal) Dans: Geochimica et Cosmochimica Acta, vol. 63, no. 21, p. 3619–3633, 1999. @article{Marty+Zimmermann1999,
title = {Volatiles (He, C, N, Ar) in mid-ocean ridge basalts : assessment of shallow-level fractionation and characterization of source composition},
author = {B. Marty and L. Zimmermann},
doi = {10.1016/S0016-7037(99)00169-6},
year = {1999},
date = {1999-01-01},
journal = {Geochimica et Cosmochimica Acta},
volume = {63},
number = {21},
pages = {3619--3633},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
