Late Pleistocene Cosmogenic 36 Cl Glacial Chronology of the Southwestern Ahklun Mountains, Alaska
Abstract Thirty-two cosmogenic 36 Cl surface exposure ages constrain the timing of two late Pleistocene glacial advances in the western Ahklun Mountains, southwestern Alaska. Boulders were sampled from one early Wisconsin ( sensu lato ) and six late Wisconsin moraines deposited by ice-cap outlet gla...
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Cambridge University Press (CUP)
2001
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Online Access: | http://dx.doi.org/10.1006/qres.2001.2255 http://api.elsevier.com/content/article/PII:S0033589401922550?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589401922550?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400010188 |
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crcambridgeupr:10.1006/qres.2001.2255 2024-09-09T19:41:11+00:00 Late Pleistocene Cosmogenic 36 Cl Glacial Chronology of the Southwestern Ahklun Mountains, Alaska Briner, Jason P. Swanson, Terry W. Caffee, Marc 2001 http://dx.doi.org/10.1006/qres.2001.2255 http://api.elsevier.com/content/article/PII:S0033589401922550?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589401922550?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400010188 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 56, issue 2, page 148-154 ISSN 0033-5894 1096-0287 journal-article 2001 crcambridgeupr https://doi.org/10.1006/qres.2001.2255 2024-06-19T04:04:39Z Abstract Thirty-two cosmogenic 36 Cl surface exposure ages constrain the timing of two late Pleistocene glacial advances in the western Ahklun Mountains, southwestern Alaska. Boulders were sampled from one early Wisconsin ( sensu lato ) and six late Wisconsin moraines deposited by ice-cap outlet glaciers and local alpine glaciers. Four moraine boulders deposited during an extensive early Wisconsin ice-cap outlet glacier advance have a mean surface exposure age of 60,300±3200 yr. A moraine deposited by an ice-cap outlet glacier during the restricted late Wisconsin advance has a mean surface exposure age of 19,600±1400 yr. Five moraines deposited by late Wisconsin alpine glaciers have mean ages that range between 30,000 and 17,000 yr. The 36 Cl ages are consistent with limiting 14 C and thermoluminescence ages from related deposits and indicate that Ahklun Mountains glaciers reached their most extensive position of the last glaciation early during the late Pleistocene, in contrast to the deep-sea isotopic record of global ice volume.1 Article in Journal/Newspaper glacier glaciers Ice cap Alaska Cambridge University Press Quaternary Research 56 2 148 154 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Thirty-two cosmogenic 36 Cl surface exposure ages constrain the timing of two late Pleistocene glacial advances in the western Ahklun Mountains, southwestern Alaska. Boulders were sampled from one early Wisconsin ( sensu lato ) and six late Wisconsin moraines deposited by ice-cap outlet glaciers and local alpine glaciers. Four moraine boulders deposited during an extensive early Wisconsin ice-cap outlet glacier advance have a mean surface exposure age of 60,300±3200 yr. A moraine deposited by an ice-cap outlet glacier during the restricted late Wisconsin advance has a mean surface exposure age of 19,600±1400 yr. Five moraines deposited by late Wisconsin alpine glaciers have mean ages that range between 30,000 and 17,000 yr. The 36 Cl ages are consistent with limiting 14 C and thermoluminescence ages from related deposits and indicate that Ahklun Mountains glaciers reached their most extensive position of the last glaciation early during the late Pleistocene, in contrast to the deep-sea isotopic record of global ice volume.1 |
format |
Article in Journal/Newspaper |
author |
Briner, Jason P. Swanson, Terry W. Caffee, Marc |
spellingShingle |
Briner, Jason P. Swanson, Terry W. Caffee, Marc Late Pleistocene Cosmogenic 36 Cl Glacial Chronology of the Southwestern Ahklun Mountains, Alaska |
author_facet |
Briner, Jason P. Swanson, Terry W. Caffee, Marc |
author_sort |
Briner, Jason P. |
title |
Late Pleistocene Cosmogenic 36 Cl Glacial Chronology of the Southwestern Ahklun Mountains, Alaska |
title_short |
Late Pleistocene Cosmogenic 36 Cl Glacial Chronology of the Southwestern Ahklun Mountains, Alaska |
title_full |
Late Pleistocene Cosmogenic 36 Cl Glacial Chronology of the Southwestern Ahklun Mountains, Alaska |
title_fullStr |
Late Pleistocene Cosmogenic 36 Cl Glacial Chronology of the Southwestern Ahklun Mountains, Alaska |
title_full_unstemmed |
Late Pleistocene Cosmogenic 36 Cl Glacial Chronology of the Southwestern Ahklun Mountains, Alaska |
title_sort |
late pleistocene cosmogenic 36 cl glacial chronology of the southwestern ahklun mountains, alaska |
publisher |
Cambridge University Press (CUP) |
publishDate |
2001 |
url |
http://dx.doi.org/10.1006/qres.2001.2255 http://api.elsevier.com/content/article/PII:S0033589401922550?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589401922550?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400010188 |
genre |
glacier glaciers Ice cap Alaska |
genre_facet |
glacier glaciers Ice cap Alaska |
op_source |
Quaternary Research volume 56, issue 2, page 148-154 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.2001.2255 |
container_title |
Quaternary Research |
container_volume |
56 |
container_issue |
2 |
container_start_page |
148 |
op_container_end_page |
154 |
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1809910632624947200 |