Geomorphological evidence and cosmogenic 10Be/26Al exposure ages for the Last Glacial Maximum and deglaciation of the Antarctic Peninsula Ice Sheet.
This paper presents the first systematic attempt to map the Last Glacial Maximum (LGM) configuration of the southern and central parts of the Antarctic Peninsula Ice Sheet, and to determine the timing of onshore ice-sheet retreat. Geomorphologic evidence shows that the LGM ice sheet expanded to form...
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2006
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Online Access: | http://dro.dur.ac.uk/1242/ https://doi.org/10.1130/B25735.1 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:1242 2023-05-15T13:15:20+02:00 Geomorphological evidence and cosmogenic 10Be/26Al exposure ages for the Last Glacial Maximum and deglaciation of the Antarctic Peninsula Ice Sheet. Bentley, M. J. Fogwill, C. J. Kubik, P. W. Sugden, D. E. 2006-09 http://dro.dur.ac.uk/1242/ https://doi.org/10.1130/B25735.1 unknown Geological Society of America dro:1242 issn:0016-7606 issn: 1943-2674 doi:10.1130/B25735.1 http://dro.dur.ac.uk/1242/ http://dx.doi.org/10.1130/B25735.1 Geological Society of America, P.O. Box 9140, Boulder, CO 80301-9140 USA (http://www.geosociety.org) Geological Society of America bulletin, 2006, Vol.118(9), pp.1149-1159 [Peer Reviewed Journal] Glacial geology Antarctic Peninsula Ice sheets Deglaciation Cosmogenic isotopes Article PeerReviewed 2006 ftunivdurham https://doi.org/10.1130/B25735.1 2020-05-28T22:25:21Z This paper presents the first systematic attempt to map the Last Glacial Maximum (LGM) configuration of the southern and central parts of the Antarctic Peninsula Ice Sheet, and to determine the timing of onshore ice-sheet retreat. Geomorphologic evidence shows that the LGM ice sheet expanded to form two ice domes in Palmer Land and merged with an expanded and thicker West Antarctic Ice Sheet in the Weddell Sea. Ice from the Antarctic Peninsula merged with Alexander Island ice in George VI Sound. Cosmogenic 10Be and 26Al data from 29 erratics on nunataks yield model ages between 7.2 ka and older than 1 Ma. The data set contains a high proportion of erratics with evidence of nuclide inheritance. Once these ages have been excluded, the cosmogenic ages suggest that thinning of the west side of the Antarctic Peninsula Ice Sheet to near-present configuration was almost complete by the early Holocene. These data, combined with previously published 14C data, exclude the possibility that the west side of the Antarctic Peninsula Ice Sheet has been thinning throughout the Holocene, as has been demonstrated for some other sectors of the West Antarctic Ice Sheet. On the east side of the Antarctic Peninsula, ice-sheet thinning was under way prior to the early Holocene, but our data do not constrain the ice-sheet behavior more recently than 7.2 ka. Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula Ice Sheet Palmer Land Sea ice Weddell Sea Durham University: Durham Research Online Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Antarctic Antarctic Peninsula George VI Sound ENVELOPE(-68.000,-68.000,-71.000,-71.000) Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) The Antarctic Weddell Weddell Sea West Antarctic Ice Sheet Geological Society of America Bulletin 118 9-10 1149 1159 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
topic |
Glacial geology Antarctic Peninsula Ice sheets Deglaciation Cosmogenic isotopes |
spellingShingle |
Glacial geology Antarctic Peninsula Ice sheets Deglaciation Cosmogenic isotopes Bentley, M. J. Fogwill, C. J. Kubik, P. W. Sugden, D. E. Geomorphological evidence and cosmogenic 10Be/26Al exposure ages for the Last Glacial Maximum and deglaciation of the Antarctic Peninsula Ice Sheet. |
topic_facet |
Glacial geology Antarctic Peninsula Ice sheets Deglaciation Cosmogenic isotopes |
description |
This paper presents the first systematic attempt to map the Last Glacial Maximum (LGM) configuration of the southern and central parts of the Antarctic Peninsula Ice Sheet, and to determine the timing of onshore ice-sheet retreat. Geomorphologic evidence shows that the LGM ice sheet expanded to form two ice domes in Palmer Land and merged with an expanded and thicker West Antarctic Ice Sheet in the Weddell Sea. Ice from the Antarctic Peninsula merged with Alexander Island ice in George VI Sound. Cosmogenic 10Be and 26Al data from 29 erratics on nunataks yield model ages between 7.2 ka and older than 1 Ma. The data set contains a high proportion of erratics with evidence of nuclide inheritance. Once these ages have been excluded, the cosmogenic ages suggest that thinning of the west side of the Antarctic Peninsula Ice Sheet to near-present configuration was almost complete by the early Holocene. These data, combined with previously published 14C data, exclude the possibility that the west side of the Antarctic Peninsula Ice Sheet has been thinning throughout the Holocene, as has been demonstrated for some other sectors of the West Antarctic Ice Sheet. On the east side of the Antarctic Peninsula, ice-sheet thinning was under way prior to the early Holocene, but our data do not constrain the ice-sheet behavior more recently than 7.2 ka. |
format |
Article in Journal/Newspaper |
author |
Bentley, M. J. Fogwill, C. J. Kubik, P. W. Sugden, D. E. |
author_facet |
Bentley, M. J. Fogwill, C. J. Kubik, P. W. Sugden, D. E. |
author_sort |
Bentley, M. J. |
title |
Geomorphological evidence and cosmogenic 10Be/26Al exposure ages for the Last Glacial Maximum and deglaciation of the Antarctic Peninsula Ice Sheet. |
title_short |
Geomorphological evidence and cosmogenic 10Be/26Al exposure ages for the Last Glacial Maximum and deglaciation of the Antarctic Peninsula Ice Sheet. |
title_full |
Geomorphological evidence and cosmogenic 10Be/26Al exposure ages for the Last Glacial Maximum and deglaciation of the Antarctic Peninsula Ice Sheet. |
title_fullStr |
Geomorphological evidence and cosmogenic 10Be/26Al exposure ages for the Last Glacial Maximum and deglaciation of the Antarctic Peninsula Ice Sheet. |
title_full_unstemmed |
Geomorphological evidence and cosmogenic 10Be/26Al exposure ages for the Last Glacial Maximum and deglaciation of the Antarctic Peninsula Ice Sheet. |
title_sort |
geomorphological evidence and cosmogenic 10be/26al exposure ages for the last glacial maximum and deglaciation of the antarctic peninsula ice sheet. |
publisher |
Geological Society of America |
publishDate |
2006 |
url |
http://dro.dur.ac.uk/1242/ https://doi.org/10.1130/B25735.1 |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-68.000,-68.000,-71.000,-71.000) ENVELOPE(-65.000,-65.000,-71.500,-71.500) |
geographic |
Alexander Island Antarctic Antarctic Peninsula George VI Sound Palmer Land The Antarctic Weddell Weddell Sea West Antarctic Ice Sheet |
geographic_facet |
Alexander Island Antarctic Antarctic Peninsula George VI Sound Palmer Land The Antarctic Weddell Weddell Sea West Antarctic Ice Sheet |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula Ice Sheet Palmer Land Sea ice Weddell Sea |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula Ice Sheet Palmer Land Sea ice Weddell Sea |
op_source |
Geological Society of America bulletin, 2006, Vol.118(9), pp.1149-1159 [Peer Reviewed Journal] |
op_relation |
dro:1242 issn:0016-7606 issn: 1943-2674 doi:10.1130/B25735.1 http://dro.dur.ac.uk/1242/ http://dx.doi.org/10.1130/B25735.1 |
op_rights |
Geological Society of America, P.O. Box 9140, Boulder, CO 80301-9140 USA (http://www.geosociety.org) |
op_doi |
https://doi.org/10.1130/B25735.1 |
container_title |
Geological Society of America Bulletin |
container_volume |
118 |
container_issue |
9-10 |
container_start_page |
1149 |
op_container_end_page |
1159 |
_version_ |
1766268088604426240 |