Rapid deglaciation of Marguerite Bay, western Antarctic Peninsula in the Early Holocene
Glacial geological evidence of rapid ice stream retreat is important for the potential insight it can bring to understanding of contemporary rapid ice sheet change. Here, we report new chronological constraints on the deglacial history of the Marguerite Trough Ice Stream, which formerly drained part...
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ftuglasgow:oai:eprints.gla.ac.uk:67634 2023-05-15T13:31:06+02:00 Rapid deglaciation of Marguerite Bay, western Antarctic Peninsula in the Early Holocene Bentley, M.J. Johnson, J.S. Hodgson, D.A. Dunai, T. Freeman, S.P.H.T. O Cofaigh, C. 2011 http://eprints.gla.ac.uk/67634/ https://doi.org/10.1016/j.quascirev.2011.09.002 unknown Elsevier Bentley, M.J., Johnson, J.S., Hodgson, D.A., Dunai, T., Freeman, S.P.H.T. <http://eprints.gla.ac.uk/view/author/12692.html> and O Cofaigh, C. (2011) Rapid deglaciation of Marguerite Bay, western Antarctic Peninsula in the Early Holocene. Quaternary Science Reviews <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Science_Reviews.html>, 30(23-24), pp. 3338-3349. (doi:10.1016/j.quascirev.2011.09.002 <http://dx.doi.org/10.1016/j.quascirev.2011.09.002>) Articles PeerReviewed 2011 ftuglasgow https://doi.org/10.1016/j.quascirev.2011.09.002 2021-09-23T22:45:54Z Glacial geological evidence of rapid ice stream retreat is important for the potential insight it can bring to understanding of contemporary rapid ice sheet change. Here, we report new chronological constraints on the deglacial history of the Marguerite Trough Ice Stream, which formerly drained part of the western margin of the Antarctic Peninsula. This ice stream has been previously identified on geomorphological grounds as an example of an outlet that underwent rapid retreat following the Last Glacial Maximum, but the precise timing of this retreat has not been conclusively determined. We obtained cosmogenic surface exposure dates on erratic boulders that record the thinning history of ice flowing into the ice stream. These dates show that the ice stream underwent >270 m of thinning very rapidly at 9.6 ka BP. The timing of ice stream thinning agrees closely with previously published data on ice shelf retreat, the age of the first post-glacial beaches, and minimum constraining ages for the onset of lacustrine sedimentation, and post-glacial sedimentation in inner shelf fjords. We compare the timing of retreat to the similarly-sized Anvers Trough ice stream further north and find that retreat in Marguerite Bay was more rapid and earlier than in the Anvers Trough. We argue that the intrusion of Circumpolar Deep Water is the most likely forcing mechanism for retreat in Marguerite Bay. A key finding of this study is that rapid retreat occurred in deep water with reverse (continent-dipping) slope but also in relatively shallow water with a positive slope. This may have implications for understanding of oceanographically-forced ice sheet change in other parts of West Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelf West Antarctica University of Glasgow: Enlighten - Publications Antarctic Antarctic Peninsula Anvers ENVELOPE(-63.500,-63.500,-64.600,-64.600) Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) The Antarctic West Antarctica Quaternary Science Reviews 30 23-24 3338 3349 |
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Open Polar |
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University of Glasgow: Enlighten - Publications |
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ftuglasgow |
language |
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description |
Glacial geological evidence of rapid ice stream retreat is important for the potential insight it can bring to understanding of contemporary rapid ice sheet change. Here, we report new chronological constraints on the deglacial history of the Marguerite Trough Ice Stream, which formerly drained part of the western margin of the Antarctic Peninsula. This ice stream has been previously identified on geomorphological grounds as an example of an outlet that underwent rapid retreat following the Last Glacial Maximum, but the precise timing of this retreat has not been conclusively determined. We obtained cosmogenic surface exposure dates on erratic boulders that record the thinning history of ice flowing into the ice stream. These dates show that the ice stream underwent >270 m of thinning very rapidly at 9.6 ka BP. The timing of ice stream thinning agrees closely with previously published data on ice shelf retreat, the age of the first post-glacial beaches, and minimum constraining ages for the onset of lacustrine sedimentation, and post-glacial sedimentation in inner shelf fjords. We compare the timing of retreat to the similarly-sized Anvers Trough ice stream further north and find that retreat in Marguerite Bay was more rapid and earlier than in the Anvers Trough. We argue that the intrusion of Circumpolar Deep Water is the most likely forcing mechanism for retreat in Marguerite Bay. A key finding of this study is that rapid retreat occurred in deep water with reverse (continent-dipping) slope but also in relatively shallow water with a positive slope. This may have implications for understanding of oceanographically-forced ice sheet change in other parts of West Antarctica. |
format |
Article in Journal/Newspaper |
author |
Bentley, M.J. Johnson, J.S. Hodgson, D.A. Dunai, T. Freeman, S.P.H.T. O Cofaigh, C. |
spellingShingle |
Bentley, M.J. Johnson, J.S. Hodgson, D.A. Dunai, T. Freeman, S.P.H.T. O Cofaigh, C. Rapid deglaciation of Marguerite Bay, western Antarctic Peninsula in the Early Holocene |
author_facet |
Bentley, M.J. Johnson, J.S. Hodgson, D.A. Dunai, T. Freeman, S.P.H.T. O Cofaigh, C. |
author_sort |
Bentley, M.J. |
title |
Rapid deglaciation of Marguerite Bay, western Antarctic Peninsula in the Early Holocene |
title_short |
Rapid deglaciation of Marguerite Bay, western Antarctic Peninsula in the Early Holocene |
title_full |
Rapid deglaciation of Marguerite Bay, western Antarctic Peninsula in the Early Holocene |
title_fullStr |
Rapid deglaciation of Marguerite Bay, western Antarctic Peninsula in the Early Holocene |
title_full_unstemmed |
Rapid deglaciation of Marguerite Bay, western Antarctic Peninsula in the Early Holocene |
title_sort |
rapid deglaciation of marguerite bay, western antarctic peninsula in the early holocene |
publisher |
Elsevier |
publishDate |
2011 |
url |
http://eprints.gla.ac.uk/67634/ https://doi.org/10.1016/j.quascirev.2011.09.002 |
long_lat |
ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Antarctic Antarctic Peninsula Anvers Marguerite Marguerite Bay The Antarctic West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula Anvers Marguerite Marguerite Bay The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelf West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelf West Antarctica |
op_relation |
Bentley, M.J., Johnson, J.S., Hodgson, D.A., Dunai, T., Freeman, S.P.H.T. <http://eprints.gla.ac.uk/view/author/12692.html> and O Cofaigh, C. (2011) Rapid deglaciation of Marguerite Bay, western Antarctic Peninsula in the Early Holocene. Quaternary Science Reviews <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Science_Reviews.html>, 30(23-24), pp. 3338-3349. (doi:10.1016/j.quascirev.2011.09.002 <http://dx.doi.org/10.1016/j.quascirev.2011.09.002>) |
op_doi |
https://doi.org/10.1016/j.quascirev.2011.09.002 |
container_title |
Quaternary Science Reviews |
container_volume |
30 |
container_issue |
23-24 |
container_start_page |
3338 |
op_container_end_page |
3349 |
_version_ |
1766015969983987712 |