Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica
Abstract We present direct terrestrial evidence of ice volume change of the Darwin and Hatherton glaciers which channel ice from the Transantarctic Mountains into the Ross Ice Shelf. Combining glacial geomorphology with cosmogenic exposure ages from 25 erratics indicates a pre-LGM ice volume at leas...
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crcambridgeupr:10.1017/s0954102010000799 2024-03-03T08:38:25+00:00 Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica Storey, B.C. Fink, D. Hood, D. Joy, K. Shulmeister, J. Riger-Kusk, M. Stevens, M.I. 2010 http://dx.doi.org/10.1017/s0954102010000799 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102010000799 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 22, issue 6, page 603-618 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2010 crcambridgeupr https://doi.org/10.1017/s0954102010000799 2024-02-08T08:42:06Z Abstract We present direct terrestrial evidence of ice volume change of the Darwin and Hatherton glaciers which channel ice from the Transantarctic Mountains into the Ross Ice Shelf. Combining glacial geomorphology with cosmogenic exposure ages from 25 erratics indicates a pre-LGM ice volume at least 600 m thicker than current Hatherton ice elevation was established at least 2.2 million years ago. In particular, five erratics spread across a drift deposit at intermediate elevations located below a prominent moraine feature mapped previously as demarcating the LGM ice advance limits, give a well-constrained single population with mean 10 Be age of 37.0 ± 5.5 ka (1σ). At lower elevations of 50–100 m above the surface of Lake Wellman, a further five samples from within a younger drift deposit range in exposure age from 1 to 19 ka. Our preferred age model interpretation, which is partly dependent on the selection of a minimum or maximum age-elevation model, suggests that LGM ice volume was not as large as previously estimated and constrains LGM ice elevation to be within ± 50 m of the modern Hatherton Glacier ice surface, effectively little different from what is observed today. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica Hatherton Glacier Ice Shelf Ross Ice Shelf Cambridge University Press Ross Ice Shelf Transantarctic Mountains Wellman ENVELOPE(-61.400,-61.400,-64.483,-64.483) Darwin Mountains ENVELOPE(156.250,156.250,-79.850,-79.850) Hatherton Glacier ENVELOPE(157.583,157.583,-79.917,-79.917) Antarctic Science 22 6 603 618 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Storey, B.C. Fink, D. Hood, D. Joy, K. Shulmeister, J. Riger-Kusk, M. Stevens, M.I. Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract We present direct terrestrial evidence of ice volume change of the Darwin and Hatherton glaciers which channel ice from the Transantarctic Mountains into the Ross Ice Shelf. Combining glacial geomorphology with cosmogenic exposure ages from 25 erratics indicates a pre-LGM ice volume at least 600 m thicker than current Hatherton ice elevation was established at least 2.2 million years ago. In particular, five erratics spread across a drift deposit at intermediate elevations located below a prominent moraine feature mapped previously as demarcating the LGM ice advance limits, give a well-constrained single population with mean 10 Be age of 37.0 ± 5.5 ka (1σ). At lower elevations of 50–100 m above the surface of Lake Wellman, a further five samples from within a younger drift deposit range in exposure age from 1 to 19 ka. Our preferred age model interpretation, which is partly dependent on the selection of a minimum or maximum age-elevation model, suggests that LGM ice volume was not as large as previously estimated and constrains LGM ice elevation to be within ± 50 m of the modern Hatherton Glacier ice surface, effectively little different from what is observed today. |
format |
Article in Journal/Newspaper |
author |
Storey, B.C. Fink, D. Hood, D. Joy, K. Shulmeister, J. Riger-Kusk, M. Stevens, M.I. |
author_facet |
Storey, B.C. Fink, D. Hood, D. Joy, K. Shulmeister, J. Riger-Kusk, M. Stevens, M.I. |
author_sort |
Storey, B.C. |
title |
Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica |
title_short |
Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica |
title_full |
Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica |
title_fullStr |
Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica |
title_full_unstemmed |
Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica |
title_sort |
cosmogenic nuclide exposure age constraints on the glacial history of the lake wellman area, darwin mountains, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2010 |
url |
http://dx.doi.org/10.1017/s0954102010000799 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102010000799 |
long_lat |
ENVELOPE(-61.400,-61.400,-64.483,-64.483) ENVELOPE(156.250,156.250,-79.850,-79.850) ENVELOPE(157.583,157.583,-79.917,-79.917) |
geographic |
Ross Ice Shelf Transantarctic Mountains Wellman Darwin Mountains Hatherton Glacier |
geographic_facet |
Ross Ice Shelf Transantarctic Mountains Wellman Darwin Mountains Hatherton Glacier |
genre |
Antarc* Antarctic Science Antarctica Hatherton Glacier Ice Shelf Ross Ice Shelf |
genre_facet |
Antarc* Antarctic Science Antarctica Hatherton Glacier Ice Shelf Ross Ice Shelf |
op_source |
Antarctic Science volume 22, issue 6, page 603-618 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102010000799 |
container_title |
Antarctic Science |
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22 |
container_issue |
6 |
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603 |
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618 |
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1792506794921164800 |