Late Quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the Antarctic Peninsula Ice Sheet
Geological and geophysical data from the NE Antarctic Peninsula continental shelf are used to reconstruct the glacial history, flow-dynamics and sedimentation of the Antarctic Peninsula Ice Sheet (APIS) along its eastern margin during the Late Quaternary. Ice advanced to the shelf edge during the La...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/1758/ https://doi.org/10.1016/j.quascirev.2004.10.007 |
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ftnerc:oai:nora.nerc.ac.uk:1758 2024-06-09T07:40:45+00:00 Late Quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the Antarctic Peninsula Ice Sheet Evans, Jeffrey Pudsey, Carol J. O Cofaigh, Colm Morris, Peter Domack, Eugene 2005 http://nora.nerc.ac.uk/id/eprint/1758/ https://doi.org/10.1016/j.quascirev.2004.10.007 unknown Elsevier Evans, Jeffrey; Pudsey, Carol J.; O Cofaigh, Colm; Morris, Peter; Domack, Eugene. 2005 Late Quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the Antarctic Peninsula Ice Sheet. Quarternary Science Reviews, 24 (5-6). 741-774. https://doi.org/10.1016/j.quascirev.2004.10.007 <https://doi.org/10.1016/j.quascirev.2004.10.007> Earth Sciences Publication - Article PeerReviewed 2005 ftnerc https://doi.org/10.1016/j.quascirev.2004.10.007 2024-05-15T08:42:16Z Geological and geophysical data from the NE Antarctic Peninsula continental shelf are used to reconstruct the glacial history, flow-dynamics and sedimentation of the Antarctic Peninsula Ice Sheet (APIS) along its eastern margin during the Late Quaternary. Ice advanced to the shelf edge during the Last Glacial Maximum (LGM) and deposited a stiff till across the shelf. The presence of highly attenuated bedforms indicates that fast-flowing outlets drained the APIS through cross-shelf troughs to the outer shelf after this ice advance. The bedforms are formed in deformation till in response to deforming bed processes. Deglaciation of Robertson Trough and the troughs of Prince Gustav Channel, Larsen-A and Larsen Inlet was continuous (and possibly rapid) on account of the absence of ice-margin recessional features. In contrast, grounding-zone wedges across the shelf of Northern Larsen-A and south of Prince Gustav Channel indicate that ice retreat was gradual and was punctuated by stillstands. The transition from a grounded ice sheet to ice shelf conditions was completed before 11–12 14C ka BP on the shelf south of Prince GustavChannel, and is marked across the shelf by a change from subglacial till to a transitional heterogeneous unit dominated by coarse-grained facies. Transitional sediments record mainly sub-ice shelf rain-out and restricted bottom current and sediment-laden plume activity, as well as localised debris flows. Meltwater-derived facies are largely absent indicating that release of meltwater was not significant beneath polar ice shelves, or during deglaciation of the APIS. In the broader context, the colder, eastern side of the APIS was extensive and was drained mainly through fast-flowing outlets (palaeo-ice streams). Therefore, the eastern APIS would have been an important contributor to sediment and iceberg flux to the Weddell Sea Embayment during the LGM and subsequent deglaciation. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelf Ice Shelves Iceberg* Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Larsen Inlet ENVELOPE(-59.500,-59.500,-64.333,-64.333) Prince Gustav Channel ENVELOPE(-58.250,-58.250,-63.833,-63.833) The Antarctic Weddell Weddell Sea Quaternary Science Reviews 24 5-6 741 774 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Evans, Jeffrey Pudsey, Carol J. O Cofaigh, Colm Morris, Peter Domack, Eugene Late Quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the Antarctic Peninsula Ice Sheet |
topic_facet |
Earth Sciences |
description |
Geological and geophysical data from the NE Antarctic Peninsula continental shelf are used to reconstruct the glacial history, flow-dynamics and sedimentation of the Antarctic Peninsula Ice Sheet (APIS) along its eastern margin during the Late Quaternary. Ice advanced to the shelf edge during the Last Glacial Maximum (LGM) and deposited a stiff till across the shelf. The presence of highly attenuated bedforms indicates that fast-flowing outlets drained the APIS through cross-shelf troughs to the outer shelf after this ice advance. The bedforms are formed in deformation till in response to deforming bed processes. Deglaciation of Robertson Trough and the troughs of Prince Gustav Channel, Larsen-A and Larsen Inlet was continuous (and possibly rapid) on account of the absence of ice-margin recessional features. In contrast, grounding-zone wedges across the shelf of Northern Larsen-A and south of Prince Gustav Channel indicate that ice retreat was gradual and was punctuated by stillstands. The transition from a grounded ice sheet to ice shelf conditions was completed before 11–12 14C ka BP on the shelf south of Prince GustavChannel, and is marked across the shelf by a change from subglacial till to a transitional heterogeneous unit dominated by coarse-grained facies. Transitional sediments record mainly sub-ice shelf rain-out and restricted bottom current and sediment-laden plume activity, as well as localised debris flows. Meltwater-derived facies are largely absent indicating that release of meltwater was not significant beneath polar ice shelves, or during deglaciation of the APIS. In the broader context, the colder, eastern side of the APIS was extensive and was drained mainly through fast-flowing outlets (palaeo-ice streams). Therefore, the eastern APIS would have been an important contributor to sediment and iceberg flux to the Weddell Sea Embayment during the LGM and subsequent deglaciation. |
format |
Article in Journal/Newspaper |
author |
Evans, Jeffrey Pudsey, Carol J. O Cofaigh, Colm Morris, Peter Domack, Eugene |
author_facet |
Evans, Jeffrey Pudsey, Carol J. O Cofaigh, Colm Morris, Peter Domack, Eugene |
author_sort |
Evans, Jeffrey |
title |
Late Quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the Antarctic Peninsula Ice Sheet |
title_short |
Late Quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the Antarctic Peninsula Ice Sheet |
title_full |
Late Quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the Antarctic Peninsula Ice Sheet |
title_fullStr |
Late Quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the Antarctic Peninsula Ice Sheet |
title_full_unstemmed |
Late Quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the Antarctic Peninsula Ice Sheet |
title_sort |
late quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the antarctic peninsula ice sheet |
publisher |
Elsevier |
publishDate |
2005 |
url |
http://nora.nerc.ac.uk/id/eprint/1758/ https://doi.org/10.1016/j.quascirev.2004.10.007 |
long_lat |
ENVELOPE(-59.500,-59.500,-64.333,-64.333) ENVELOPE(-58.250,-58.250,-63.833,-63.833) |
geographic |
Antarctic Antarctic Peninsula Larsen Inlet Prince Gustav Channel The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Larsen Inlet Prince Gustav Channel The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelf Ice Shelves Iceberg* Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Ice Shelf Ice Shelves Iceberg* Weddell Sea |
op_relation |
Evans, Jeffrey; Pudsey, Carol J.; O Cofaigh, Colm; Morris, Peter; Domack, Eugene. 2005 Late Quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the Antarctic Peninsula Ice Sheet. Quarternary Science Reviews, 24 (5-6). 741-774. https://doi.org/10.1016/j.quascirev.2004.10.007 <https://doi.org/10.1016/j.quascirev.2004.10.007> |
op_doi |
https://doi.org/10.1016/j.quascirev.2004.10.007 |
container_title |
Quaternary Science Reviews |
container_volume |
24 |
container_issue |
5-6 |
container_start_page |
741 |
op_container_end_page |
774 |
_version_ |
1801369152406945792 |