Glacial geomorphology and cosmogenic 10Be and 26Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica
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. 10Be and 26Al cosmogenic surface exposure dating provided chronological cont...
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Cambridge University Press
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ftuglasgow:oai:eprints.gla.ac.uk:128543 2023-05-15T14:04:48+02:00 Glacial geomorphology and cosmogenic 10Be and 26Al 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 2012-08 http://eprints.gla.ac.uk/128543/ unknown Cambridge University Press Hodgson, D. A., Bentley, M. J., Schnabel, C. <http://eprints.gla.ac.uk/view/author/3038.html>, Cziferszky, A., Fretwell, P., Convey, P. and Xu, S. <http://eprints.gla.ac.uk/view/author/12708.html> (2012) Glacial geomorphology and cosmogenic 10Be and 26Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica. Antarctic Science <http://eprints.gla.ac.uk/view/journal_volume/Antarctic_Science.html>, 24(4), pp. 377-394. (doi:10.1017/S0954102012000016 <http://dx.doi.org/10.1017/S0954102012000016>) Articles PeerReviewed 2012 ftuglasgow https://doi.org/10.1017/S0954102012000016 2020-01-10T01:12:39Z 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. 10Be and 26Al 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 University of Glasgow: Enlighten - Publications Antarctic Dufek Massif ENVELOPE(-52.500,-52.500,-82.500,-82.500) Weddell Weddell Sea Antarctic Science 24 4 377 394 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
unknown |
description |
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. 10Be and 26Al 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 |
spellingShingle |
Hodgson, Dominic A. Bentley, Michael J. Schnabel, Christoph Cziferszky, Andreas Fretwell, Peter Convey, Peter Xu, Sheng Glacial geomorphology and cosmogenic 10Be and 26Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
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 10Be and 26Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
title_short |
Glacial geomorphology and cosmogenic 10Be and 26Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
title_full |
Glacial geomorphology and cosmogenic 10Be and 26Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
title_fullStr |
Glacial geomorphology and cosmogenic 10Be and 26Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
title_full_unstemmed |
Glacial geomorphology and cosmogenic 10Be and 26Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica |
title_sort |
glacial geomorphology and cosmogenic 10be and 26al exposure ages in the northern dufek massif, weddell sea embayment, antarctica |
publisher |
Cambridge University Press |
publishDate |
2012 |
url |
http://eprints.gla.ac.uk/128543/ |
long_lat |
ENVELOPE(-52.500,-52.500,-82.500,-82.500) |
geographic |
Antarctic Dufek Massif Weddell Weddell Sea |
geographic_facet |
Antarctic Dufek Massif Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Science Antarctica Ice Sheet Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctica Ice Sheet Weddell Sea |
op_relation |
Hodgson, D. A., Bentley, M. J., Schnabel, C. <http://eprints.gla.ac.uk/view/author/3038.html>, Cziferszky, A., Fretwell, P., Convey, P. and Xu, S. <http://eprints.gla.ac.uk/view/author/12708.html> (2012) Glacial geomorphology and cosmogenic 10Be and 26Al exposure ages in the northern Dufek Massif, Weddell Sea embayment, Antarctica. Antarctic Science <http://eprints.gla.ac.uk/view/journal_volume/Antarctic_Science.html>, 24(4), pp. 377-394. (doi:10.1017/S0954102012000016 <http://dx.doi.org/10.1017/S0954102012000016>) |
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_ |
1766276135812857856 |