Cosmogenic 10Be in pyroxene: laboratory progress, production rate systematics, and application of the 10Be-3He nuclide pair in the Antarctic Dry Valleys
Here, we present cosmogenic 10Be and 3He data from Ferrar dolerite pyroxenes in surficial rock samples and a bedrock core from the McMurdo Dry Valleys, Antarctica, with the goal of refining the laboratory methods for extracting beryllium from pyroxene, further estimating the 10Be production rate in...
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Copernicus Publications
2022
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00064124 2023-05-15T13:49:22+02:00 Cosmogenic 10Be in pyroxene: laboratory progress, production rate systematics, and application of the 10Be-3He nuclide pair in the Antarctic Dry Valleys Balter-Kennedy, Allie Schaefer, Joerg M. Schwartz, Roseanne Lamp, Jennifer L. Penrose, Laura Middleton, Jennifer Tibari, Bouchaïb Blard, Pierre-Henri Winckler, Gisela Hidy, Alan J. Balco, Greg 2022-12 electronic https://doi.org/10.5194/egusphere-2022-1379 https://noa.gwlb.de/receive/cop_mods_00064124 https://egusphere.copernicus.org/preprints/egusphere-2022-1379/egusphere-2022-1379.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2022-1379 https://noa.gwlb.de/receive/cop_mods_00064124 https://egusphere.copernicus.org/preprints/egusphere-2022-1379/egusphere-2022-1379.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/egusphere-2022-1379 2022-12-26T00:12:59Z Here, we present cosmogenic 10Be and 3He data from Ferrar dolerite pyroxenes in surficial rock samples and a bedrock core from the McMurdo Dry Valleys, Antarctica, with the goal of refining the laboratory methods for extracting beryllium from pyroxene, further estimating the 10Be production rate in pyroxene, and demonstrating the applicability of the 10Be-3He in mafic rock. The ability to routinely measure cosmogenic 10Be in pyroxene will open new opportunities for quantifying exposure durations and Earth surface processes in mafic rocks. We describe scalable laboratory methods for isolating beryllium from pyroxene, which includes a simple hydrofluoric acid leaching procedure for removing meteoric 10Be, and the addition of a pH 8 precipitation step to reduce the cation load prior to ion exchange chromatography. 10Be measurements in pyroxene from the surface samples have apparent 3He exposure ages of 1–6 Ma. We estimate a spallation production rate for 10Be in pyroxene, referenced to 3He, of 3.6 ± 0.2 atoms g−1 yr−1. 10Be and 3He measurements in the bedrock core yield initial estimates for parameters associated with 10Be and 3He production by negative muon capture (f10* = 0.00183 and f3* fC fD = 0.00337). Next, we demonstrate that the 10Be-3He pair in pyroxene can be used to simultaneously resolve erosion rates and exposure ages, finding that the measured cosmogenic-nuclide concentrations in our surface samples are best explained by 2–8 Ma of exposure at erosion rates of 0–35 cm Myr−1. Finally, given the low 10Be in our laboratory blanks (average of 5.7 × 104 atoms), the reported measurement precision, and our estimated production rate, it should be possible to measure 2 g samples with 10Be concentrations of 6 × 104 atoms g−1 and 1.5 × 104 atoms g−1 with 5 and 15% uncertainty, respectively. With this level of precision, Last Glacial Maximum to Late Holocene surfaces can now be dated with 10Be in pyroxene. Application of 10Be in pyroxene, alone or in combination with 3He, will expand possibilities for ... Article in Journal/Newspaper Antarc* Antarctic Antarctica McMurdo Dry Valleys Niedersächsisches Online-Archiv NOA Antarctic The Antarctic McMurdo Dry Valleys |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Balter-Kennedy, Allie Schaefer, Joerg M. Schwartz, Roseanne Lamp, Jennifer L. Penrose, Laura Middleton, Jennifer Tibari, Bouchaïb Blard, Pierre-Henri Winckler, Gisela Hidy, Alan J. Balco, Greg Cosmogenic 10Be in pyroxene: laboratory progress, production rate systematics, and application of the 10Be-3He nuclide pair in the Antarctic Dry Valleys |
topic_facet |
article Verlagsveröffentlichung |
description |
Here, we present cosmogenic 10Be and 3He data from Ferrar dolerite pyroxenes in surficial rock samples and a bedrock core from the McMurdo Dry Valleys, Antarctica, with the goal of refining the laboratory methods for extracting beryllium from pyroxene, further estimating the 10Be production rate in pyroxene, and demonstrating the applicability of the 10Be-3He in mafic rock. The ability to routinely measure cosmogenic 10Be in pyroxene will open new opportunities for quantifying exposure durations and Earth surface processes in mafic rocks. We describe scalable laboratory methods for isolating beryllium from pyroxene, which includes a simple hydrofluoric acid leaching procedure for removing meteoric 10Be, and the addition of a pH 8 precipitation step to reduce the cation load prior to ion exchange chromatography. 10Be measurements in pyroxene from the surface samples have apparent 3He exposure ages of 1–6 Ma. We estimate a spallation production rate for 10Be in pyroxene, referenced to 3He, of 3.6 ± 0.2 atoms g−1 yr−1. 10Be and 3He measurements in the bedrock core yield initial estimates for parameters associated with 10Be and 3He production by negative muon capture (f10* = 0.00183 and f3* fC fD = 0.00337). Next, we demonstrate that the 10Be-3He pair in pyroxene can be used to simultaneously resolve erosion rates and exposure ages, finding that the measured cosmogenic-nuclide concentrations in our surface samples are best explained by 2–8 Ma of exposure at erosion rates of 0–35 cm Myr−1. Finally, given the low 10Be in our laboratory blanks (average of 5.7 × 104 atoms), the reported measurement precision, and our estimated production rate, it should be possible to measure 2 g samples with 10Be concentrations of 6 × 104 atoms g−1 and 1.5 × 104 atoms g−1 with 5 and 15% uncertainty, respectively. With this level of precision, Last Glacial Maximum to Late Holocene surfaces can now be dated with 10Be in pyroxene. Application of 10Be in pyroxene, alone or in combination with 3He, will expand possibilities for ... |
format |
Article in Journal/Newspaper |
author |
Balter-Kennedy, Allie Schaefer, Joerg M. Schwartz, Roseanne Lamp, Jennifer L. Penrose, Laura Middleton, Jennifer Tibari, Bouchaïb Blard, Pierre-Henri Winckler, Gisela Hidy, Alan J. Balco, Greg |
author_facet |
Balter-Kennedy, Allie Schaefer, Joerg M. Schwartz, Roseanne Lamp, Jennifer L. Penrose, Laura Middleton, Jennifer Tibari, Bouchaïb Blard, Pierre-Henri Winckler, Gisela Hidy, Alan J. Balco, Greg |
author_sort |
Balter-Kennedy, Allie |
title |
Cosmogenic 10Be in pyroxene: laboratory progress, production rate systematics, and application of the 10Be-3He nuclide pair in the Antarctic Dry Valleys |
title_short |
Cosmogenic 10Be in pyroxene: laboratory progress, production rate systematics, and application of the 10Be-3He nuclide pair in the Antarctic Dry Valleys |
title_full |
Cosmogenic 10Be in pyroxene: laboratory progress, production rate systematics, and application of the 10Be-3He nuclide pair in the Antarctic Dry Valleys |
title_fullStr |
Cosmogenic 10Be in pyroxene: laboratory progress, production rate systematics, and application of the 10Be-3He nuclide pair in the Antarctic Dry Valleys |
title_full_unstemmed |
Cosmogenic 10Be in pyroxene: laboratory progress, production rate systematics, and application of the 10Be-3He nuclide pair in the Antarctic Dry Valleys |
title_sort |
cosmogenic 10be in pyroxene: laboratory progress, production rate systematics, and application of the 10be-3he nuclide pair in the antarctic dry valleys |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/egusphere-2022-1379 https://noa.gwlb.de/receive/cop_mods_00064124 https://egusphere.copernicus.org/preprints/egusphere-2022-1379/egusphere-2022-1379.pdf |
geographic |
Antarctic The Antarctic McMurdo Dry Valleys |
geographic_facet |
Antarctic The Antarctic McMurdo Dry Valleys |
genre |
Antarc* Antarctic Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Antarctica McMurdo Dry Valleys |
op_relation |
https://doi.org/10.5194/egusphere-2022-1379 https://noa.gwlb.de/receive/cop_mods_00064124 https://egusphere.copernicus.org/preprints/egusphere-2022-1379/egusphere-2022-1379.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/egusphere-2022-1379 |
_version_ |
1766251248355377152 |