Glacial geomorphology and cosmogenic 10 Be and 26 Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica
Abstract We studied the glacial geomorphology and geochronology of two ice-free valleys in the Dufek Massif (Antarctic Specially Protected Area 119) providing new constraints on past ice sheet thickness in the Weddell Sea embayment. 10 Be and 26 Al cosmogenic surface exposure dating provided chronol...
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crcambridgeupr:10.1017/s0954102012000016 2024-03-03T08:37:29+00:00 Glacial geomorphology and cosmogenic 10 Be and 26 Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica Hodgson, Dominic A. Bentley, Michael J. Schnabel, Christoph Cziferszky, Andreas Fretwell, Peter Convey, Peter Xu, Sheng 2012 http://dx.doi.org/10.1017/s0954102012000016 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102012000016 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 24, issue 4, page 377-394 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2012 crcambridgeupr https://doi.org/10.1017/s0954102012000016 2024-02-08T08:35:42Z Abstract We studied the glacial geomorphology and geochronology of two ice-free valleys in the Dufek Massif (Antarctic Specially Protected Area 119) providing new constraints on past ice sheet thickness in the Weddell Sea embayment. 10 Be and 26 Al cosmogenic surface exposure dating provided chronological control. Seven glacial stages are proposed. These include an alpine glaciation, with subsequent (mid-Miocene?) over-riding by a warm-based ice sheet. Subsequent advances are marked by a series of minor drift deposits at 760 m altitude at > 1 Ma, followed by at least two later ice sheet advances that are characterized by extensive drift sheet deposition. An advance of plateau ice field outlet glaciers from the south postdated these drift sheets. The most recent advance involved the cold-based expansion of the ice sheet from the north at the Last Glacial Maximum, or earlier, which deposited a series of bouldery moraines during its retreat. This suggests at most a relatively modest expansion of the ice sheet and outlet glaciers dominated by a lateral ice expansion of just 2–3 km and maintaining a thickness similar to that of the northern ice sheet front. These observations are consistent with other reports of modest ice sheet thickening around the Weddell Sea embayment during the Last Glacial Maximum. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Antarctica Ice Sheet Weddell Sea Cambridge University Press Antarctic Weddell Sea Weddell Dufek Massif ENVELOPE(-52.500,-52.500,-82.500,-82.500) Antarctic Science 24 4 377 394 |
institution |
Open Polar |
collection |
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 Hodgson, Dominic A. Bentley, Michael J. Schnabel, Christoph Cziferszky, Andreas Fretwell, Peter Convey, Peter Xu, Sheng Glacial geomorphology and cosmogenic 10 Be and 26 Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract We studied the glacial geomorphology and geochronology of two ice-free valleys in the Dufek Massif (Antarctic Specially Protected Area 119) providing new constraints on past ice sheet thickness in the Weddell Sea embayment. 10 Be and 26 Al cosmogenic surface exposure dating provided chronological control. Seven glacial stages are proposed. These include an alpine glaciation, with subsequent (mid-Miocene?) over-riding by a warm-based ice sheet. Subsequent advances are marked by a series of minor drift deposits at 760 m altitude at > 1 Ma, followed by at least two later ice sheet advances that are characterized by extensive drift sheet deposition. An advance of plateau ice field outlet glaciers from the south postdated these drift sheets. The most recent advance involved the cold-based expansion of the ice sheet from the north at the Last Glacial Maximum, or earlier, which deposited a series of bouldery moraines during its retreat. This suggests at most a relatively modest expansion of the ice sheet and outlet glaciers dominated by a lateral ice expansion of just 2–3 km and maintaining a thickness similar to that of the northern ice sheet front. These observations are consistent with other reports of modest ice sheet thickening around the Weddell Sea embayment during the Last Glacial Maximum. |
format |
Article in Journal/Newspaper |
author |
Hodgson, Dominic A. Bentley, Michael J. Schnabel, Christoph Cziferszky, Andreas Fretwell, Peter Convey, Peter Xu, Sheng |
author_facet |
Hodgson, Dominic A. Bentley, Michael J. Schnabel, Christoph Cziferszky, Andreas Fretwell, Peter Convey, Peter Xu, Sheng |
author_sort |
Hodgson, Dominic A. |
title |
Glacial geomorphology and cosmogenic 10 Be and 26 Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
title_short |
Glacial geomorphology and cosmogenic 10 Be and 26 Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
title_full |
Glacial geomorphology and cosmogenic 10 Be and 26 Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
title_fullStr |
Glacial geomorphology and cosmogenic 10 Be and 26 Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
title_full_unstemmed |
Glacial geomorphology and cosmogenic 10 Be and 26 Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
title_sort |
glacial geomorphology and cosmogenic 10 be and 26 al exposure ages in the northern dufek massif, weddell sea embayment, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2012 |
url |
http://dx.doi.org/10.1017/s0954102012000016 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102012000016 |
long_lat |
ENVELOPE(-52.500,-52.500,-82.500,-82.500) |
geographic |
Antarctic Weddell Sea Weddell Dufek Massif |
geographic_facet |
Antarctic Weddell Sea Weddell Dufek Massif |
genre |
Antarc* Antarctic Antarctic Science Antarctica Ice Sheet Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctica Ice Sheet Weddell Sea |
op_source |
Antarctic Science volume 24, issue 4, page 377-394 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102012000016 |
container_title |
Antarctic Science |
container_volume |
24 |
container_issue |
4 |
container_start_page |
377 |
op_container_end_page |
394 |
_version_ |
1792499228891676672 |