Surface-Exposure Chronology Using in Situ Cosmogenic 3 He in Antarctic Quartz Sandstone Boulders
Abstract In situ -produced cosmogenic helium ( 3 He c ) provides a new tool for constraining histories of Quaternary geomorphic surfaces. Before general application of the technique, however, the systematics and production rates of 3 He c must be well understood. In a companion study, 3 He and 10 Be...
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Cambridge University Press (CUP)
1993
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Online Access: | http://dx.doi.org/10.1006/qres.1993.1001 http://api.elsevier.com/content/article/PII:S003358948371001X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358948371001X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400034104 |
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crcambridgeupr:10.1006/qres.1993.1001 2024-06-09T07:41:10+00:00 Surface-Exposure Chronology Using in Situ Cosmogenic 3 He in Antarctic Quartz Sandstone Boulders Brook, Edward J. Kurz, Mark D. 1993 http://dx.doi.org/10.1006/qres.1993.1001 http://api.elsevier.com/content/article/PII:S003358948371001X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358948371001X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400034104 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 39, issue 1, page 1-10 ISSN 0033-5894 1096-0287 journal-article 1993 crcambridgeupr https://doi.org/10.1006/qres.1993.1001 2024-05-15T13:13:18Z Abstract In situ -produced cosmogenic helium ( 3 He c ) provides a new tool for constraining histories of Quaternary geomorphic surfaces. Before general application of the technique, however, the systematics and production rates of 3 He c must be well understood. In a companion study, 3 He and 10 Be data from sandstone and granite boulders in the Dry Valleys region of Antarctica have been used to constrain the ages of an important moraine sequence formed by the Taylor Glacier. Data from these deposits also provide information about the systematics of 3 He in quartz that has important implications for geochronology based on 3 Hec. In contrast to previous results from olivine and clinopyroxene, crushing quartz in vacuo releases helium with high 3 He/ 4 He ratios (up to 148 × R a , where R a is the atmospheric 3 He/ 4 He ratio), indicating that crushing cannot be used to determine the isotopic composition of trapped (i.e., noncosmogenic) helium in quartz. Analysis of 3 He in different size fractions of the same samples indicates significant 3 He loss not predicted by existing 3 He diffusion data for quartz. The origin of the discrepancy is not clear, but loss from these samples is not as significant as suggested by the limited data of previous studies. Article in Journal/Newspaper Antarc* Antarctic Antarctica Taylor Glacier Cambridge University Press Antarctic Taylor Glacier ENVELOPE(162.167,162.167,-77.733,-77.733) Quaternary Research 39 1 1 10 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract In situ -produced cosmogenic helium ( 3 He c ) provides a new tool for constraining histories of Quaternary geomorphic surfaces. Before general application of the technique, however, the systematics and production rates of 3 He c must be well understood. In a companion study, 3 He and 10 Be data from sandstone and granite boulders in the Dry Valleys region of Antarctica have been used to constrain the ages of an important moraine sequence formed by the Taylor Glacier. Data from these deposits also provide information about the systematics of 3 He in quartz that has important implications for geochronology based on 3 Hec. In contrast to previous results from olivine and clinopyroxene, crushing quartz in vacuo releases helium with high 3 He/ 4 He ratios (up to 148 × R a , where R a is the atmospheric 3 He/ 4 He ratio), indicating that crushing cannot be used to determine the isotopic composition of trapped (i.e., noncosmogenic) helium in quartz. Analysis of 3 He in different size fractions of the same samples indicates significant 3 He loss not predicted by existing 3 He diffusion data for quartz. The origin of the discrepancy is not clear, but loss from these samples is not as significant as suggested by the limited data of previous studies. |
format |
Article in Journal/Newspaper |
author |
Brook, Edward J. Kurz, Mark D. |
spellingShingle |
Brook, Edward J. Kurz, Mark D. Surface-Exposure Chronology Using in Situ Cosmogenic 3 He in Antarctic Quartz Sandstone Boulders |
author_facet |
Brook, Edward J. Kurz, Mark D. |
author_sort |
Brook, Edward J. |
title |
Surface-Exposure Chronology Using in Situ Cosmogenic 3 He in Antarctic Quartz Sandstone Boulders |
title_short |
Surface-Exposure Chronology Using in Situ Cosmogenic 3 He in Antarctic Quartz Sandstone Boulders |
title_full |
Surface-Exposure Chronology Using in Situ Cosmogenic 3 He in Antarctic Quartz Sandstone Boulders |
title_fullStr |
Surface-Exposure Chronology Using in Situ Cosmogenic 3 He in Antarctic Quartz Sandstone Boulders |
title_full_unstemmed |
Surface-Exposure Chronology Using in Situ Cosmogenic 3 He in Antarctic Quartz Sandstone Boulders |
title_sort |
surface-exposure chronology using in situ cosmogenic 3 he in antarctic quartz sandstone boulders |
publisher |
Cambridge University Press (CUP) |
publishDate |
1993 |
url |
http://dx.doi.org/10.1006/qres.1993.1001 http://api.elsevier.com/content/article/PII:S003358948371001X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358948371001X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400034104 |
long_lat |
ENVELOPE(162.167,162.167,-77.733,-77.733) |
geographic |
Antarctic Taylor Glacier |
geographic_facet |
Antarctic Taylor Glacier |
genre |
Antarc* Antarctic Antarctica Taylor Glacier |
genre_facet |
Antarc* Antarctic Antarctica Taylor Glacier |
op_source |
Quaternary Research volume 39, issue 1, page 1-10 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.1993.1001 |
container_title |
Quaternary Research |
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39 |
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1 |
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1 |
op_container_end_page |
10 |
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1801369617070817280 |