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- 10 Be and cosmogenic- 3 He 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 10 Be pro...
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ftcopernicus:oai:publications.copernicus.org:gchron108132 2023-08-15T12:38:16+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 Hanley, Jean Tibari, Bouchaïb Blard, Pierre-Henri Winckler, Gisela Hidy, Alan J. Balco, Greg 2023-07-17 application/pdf https://doi.org/10.5194/gchron-5-301-2023 https://gchron.copernicus.org/articles/5/301/2023/ eng eng doi:10.5194/gchron-5-301-2023 https://gchron.copernicus.org/articles/5/301/2023/ eISSN: 2628-3719 Text 2023 ftcopernicus https://doi.org/10.5194/gchron-5-301-2023 2023-07-24T16:24:18Z Here, we present cosmogenic- 10 Be and cosmogenic- 3 He 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 10 Be production rate in pyroxene and demonstrating the applicability of 10 Be– 3 He in mafic rock. The ability to routinely measure cosmogenic 10 Be 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 include a simple hydrofluoric acid leaching procedure for removing meteoric 10 Be and the addition of a pH 8 precipitation step to reduce the cation load prior to ion exchange chromatography. 10 Be measurements in pyroxene from the surface samples have apparent 3 He exposure ages of 1–6 Myr. We estimate a spallation production rate for 10 Be in pyroxene, referenced to 3 He, of 3.6 ± 0.2 atoms g −1 yr −1 . 10 Be and 3 He measurements in the bedrock core yield initial estimates for parameters associated with 10 Be and 3 He production by negative-muon capture ( f 10 ∗ = 0.00183 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="67pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="b8d80758c5229555d2f87ecc0009ae48"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="gchron-5-301-2023-ie00001.svg" width="67pt" height="14pt" src="gchron-5-301-2023-ie00001.png"/></svg:svg> and f 3 ∗ f C f D = 0.00337 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="83pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="9948fc960df7c711666d09b5b9e12773"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="gchron-5-301-2023-ie00002.svg" width="83pt" height="14pt" src="gchron-5-301-2023-ie00002.png"/></svg:svg> ). Next, we demonstrate that the 10 Be– 3 He pair in pyroxene can be used to simultaneously resolve ... Text Antarc* Antarctic Antarctica McMurdo Dry Valleys Copernicus Publications: E-Journals Antarctic The Antarctic McMurdo Dry Valleys Geochronology 5 2 301 321 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Here, we present cosmogenic- 10 Be and cosmogenic- 3 He 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 10 Be production rate in pyroxene and demonstrating the applicability of 10 Be– 3 He in mafic rock. The ability to routinely measure cosmogenic 10 Be 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 include a simple hydrofluoric acid leaching procedure for removing meteoric 10 Be and the addition of a pH 8 precipitation step to reduce the cation load prior to ion exchange chromatography. 10 Be measurements in pyroxene from the surface samples have apparent 3 He exposure ages of 1–6 Myr. We estimate a spallation production rate for 10 Be in pyroxene, referenced to 3 He, of 3.6 ± 0.2 atoms g −1 yr −1 . 10 Be and 3 He measurements in the bedrock core yield initial estimates for parameters associated with 10 Be and 3 He production by negative-muon capture ( f 10 ∗ = 0.00183 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="67pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="b8d80758c5229555d2f87ecc0009ae48"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="gchron-5-301-2023-ie00001.svg" width="67pt" height="14pt" src="gchron-5-301-2023-ie00001.png"/></svg:svg> and f 3 ∗ f C f D = 0.00337 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="83pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="9948fc960df7c711666d09b5b9e12773"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="gchron-5-301-2023-ie00002.svg" width="83pt" height="14pt" src="gchron-5-301-2023-ie00002.png"/></svg:svg> ). Next, we demonstrate that the 10 Be– 3 He pair in pyroxene can be used to simultaneously resolve ... |
format |
Text |
author |
Balter-Kennedy, Allie Schaefer, Joerg M. Schwartz, Roseanne Lamp, Jennifer L. Penrose, Laura Middleton, Jennifer Hanley, Jean Tibari, Bouchaïb Blard, Pierre-Henri Winckler, Gisela Hidy, Alan J. Balco, Greg |
spellingShingle |
Balter-Kennedy, Allie Schaefer, Joerg M. Schwartz, Roseanne Lamp, Jennifer L. Penrose, Laura Middleton, Jennifer Hanley, Jean 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 |
author_facet |
Balter-Kennedy, Allie Schaefer, Joerg M. Schwartz, Roseanne Lamp, Jennifer L. Penrose, Laura Middleton, Jennifer Hanley, Jean 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 |
publishDate |
2023 |
url |
https://doi.org/10.5194/gchron-5-301-2023 https://gchron.copernicus.org/articles/5/301/2023/ |
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_source |
eISSN: 2628-3719 |
op_relation |
doi:10.5194/gchron-5-301-2023 https://gchron.copernicus.org/articles/5/301/2023/ |
op_doi |
https://doi.org/10.5194/gchron-5-301-2023 |
container_title |
Geochronology |
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5 |
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2 |
container_start_page |
301 |
op_container_end_page |
321 |
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1774299571655016448 |