Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica.
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 t...
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ftansto:oai:apo-prod.ansto.gov.au:10238/2983 2023-05-15T13:36:16+02:00 Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica. Storey, BC Fink, D Hood, D Joy, K Shulmeister, J Riger-Kusk, M Stevens, MI 2010-12 http://apo.ansto.gov.au/dspace/handle/10238/2983 https://doi.org/10.1017/S0954102010000799 en eng Cambridge University Press Storey, B. C., Fink, D., Hood, D., Joy, K., Shulmeister, J., Riger-Kusk, M., & Stevens, M. I. (2010). Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica. Antarctic Science, 22(Special Issue 6 - The Latitudinal Gradient Project (LGP)), 603-618. doi:10.1017/S0954102010000799 0954-1020 http://dx.doi.org/10.1017/S0954102010000799 http://apo.ansto.gov.au/dspace/handle/10238/2983 Age estimation Latitude effect Antarctica Historical aspects Glaciers Environmental exposure Journal Article 2010 ftansto https://doi.org/10.1017/S0954102010000799 2020-09-07T22:28:35Z 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 10Be 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. © 2010, Cambridge University Press Article in Journal/Newspaper Antarc* Antarctic Science Antarctica Hatherton Glacier Ice Shelf Ross Ice Shelf Australian Nuclear Science and Technology Organisation: ANSTO Publications Online Darwin Mountains ENVELOPE(156.250,156.250,-79.850,-79.850) Hatherton Glacier ENVELOPE(157.583,157.583,-79.917,-79.917) Ross Ice Shelf Transantarctic Mountains Wellman ENVELOPE(-61.400,-61.400,-64.483,-64.483) Antarctic Science 22 6 603 618 |
institution |
Open Polar |
collection |
Australian Nuclear Science and Technology Organisation: ANSTO Publications Online |
op_collection_id |
ftansto |
language |
English |
topic |
Age estimation Latitude effect Antarctica Historical aspects Glaciers Environmental exposure |
spellingShingle |
Age estimation Latitude effect Antarctica Historical aspects Glaciers Environmental exposure Storey, BC Fink, D Hood, D Joy, K Shulmeister, J Riger-Kusk, M Stevens, MI Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica. |
topic_facet |
Age estimation Latitude effect Antarctica Historical aspects Glaciers Environmental exposure |
description |
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 10Be 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. © 2010, Cambridge University Press |
format |
Article in Journal/Newspaper |
author |
Storey, BC Fink, D Hood, D Joy, K Shulmeister, J Riger-Kusk, M Stevens, MI |
author_facet |
Storey, BC Fink, D Hood, D Joy, K Shulmeister, J Riger-Kusk, M Stevens, MI |
author_sort |
Storey, BC |
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 |
publishDate |
2010 |
url |
http://apo.ansto.gov.au/dspace/handle/10238/2983 https://doi.org/10.1017/S0954102010000799 |
long_lat |
ENVELOPE(156.250,156.250,-79.850,-79.850) ENVELOPE(157.583,157.583,-79.917,-79.917) ENVELOPE(-61.400,-61.400,-64.483,-64.483) |
geographic |
Darwin Mountains Hatherton Glacier Ross Ice Shelf Transantarctic Mountains Wellman |
geographic_facet |
Darwin Mountains Hatherton Glacier Ross Ice Shelf Transantarctic Mountains Wellman |
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_relation |
Storey, B. C., Fink, D., Hood, D., Joy, K., Shulmeister, J., Riger-Kusk, M., & Stevens, M. I. (2010). Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica. Antarctic Science, 22(Special Issue 6 - The Latitudinal Gradient Project (LGP)), 603-618. doi:10.1017/S0954102010000799 0954-1020 http://dx.doi.org/10.1017/S0954102010000799 http://apo.ansto.gov.au/dspace/handle/10238/2983 |
op_doi |
https://doi.org/10.1017/S0954102010000799 |
container_title |
Antarctic Science |
container_volume |
22 |
container_issue |
6 |
container_start_page |
603 |
op_container_end_page |
618 |
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1766076318750867456 |