Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula
We present new data regarding the past dynamics of Marguerite Trough Ice Stream, George VI Ice Shelf and valley glaciers from Ablation Point Massif on Alexander Island, Antarctic Peninsula. This ice-free oasis preserves a geological record of ice stream lateral moraines, ice-dammed lakes, ice-shelf...
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ftleedsuniv:oai:eprints.whiterose.ac.uk:123988 2023-05-15T13:15:14+02:00 Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula Davies, BJ Hambrey, MJ Glasser, NF Holt, T Rodés, A Smellie, JL Carrivick, JL Blockley, SPE 2017-12-01 text https://eprints.whiterose.ac.uk/123988/ https://eprints.whiterose.ac.uk/123988/1/1-s2.0-S0277379117304651-main.pdf en eng Elsevier https://eprints.whiterose.ac.uk/123988/1/1-s2.0-S0277379117304651-main.pdf Davies, BJ, Hambrey, MJ, Glasser, NF et al. (5 more authors) (2017) Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula. Quaternary Science Reviews, 177. pp. 189-219. ISSN 0277-3791 Article NonPeerReviewed 2017 ftleedsuniv 2023-01-30T22:00:59Z We present new data regarding the past dynamics of Marguerite Trough Ice Stream, George VI Ice Shelf and valley glaciers from Ablation Point Massif on Alexander Island, Antarctic Peninsula. This ice-free oasis preserves a geological record of ice stream lateral moraines, ice-dammed lakes, ice-shelf moraines and valley glacier moraines, which we dated using cosmogenic nuclide ages. We provide one of the first detailed sediment-landform assemblage descriptions of epishelf lake shorelines. Marguerite Trough Ice Stream imprinted lateral moraines against eastern Alexander Island at 120 m at Ablation Point Massif. During deglaciation, lateral lakes formed in the Ablation and Moutonnée valleys, dammed against the ice stream in George VI Sound. Exposure ages from boulders on these shorelines yielded ages of 13.9 to 9.7 ka. Following recession of the ice stream, George VI Ice Shelf formed in George VI Sound. An epishelf lake formed at 15–20 m asl in Ablation and Moutonnée valleys, dated from 9.4 to 4.6 ka, suggesting that the lake was stable and persistent for some 5000 years. Lake-level lowering occurred after this, with the lake level at 12 m at 3.1 ± 0.4 ka and at 5 m asl today. A readvance of the valley glaciers on Alexander Island at 4.4 ± 0.7 ka is recorded by valley glacier moraines overlying epishelf lake sediments. We speculate that the glacier readvance, which occurred during a period of warmth, may have been caused by a dynamic response of the glaciers to a lowering in surface elevation of George VI Ice Shelf. Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf White Rose Research Online (Universities of Leeds, Sheffield & York) Antarctic Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) George VI Ice Shelf ENVELOPE(-67.840,-67.840,-71.692,-71.692) George VI Sound ENVELOPE(-68.000,-68.000,-71.000,-71.000) Ablation Point ENVELOPE(-68.333,-68.333,-70.799,-70.799) |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
We present new data regarding the past dynamics of Marguerite Trough Ice Stream, George VI Ice Shelf and valley glaciers from Ablation Point Massif on Alexander Island, Antarctic Peninsula. This ice-free oasis preserves a geological record of ice stream lateral moraines, ice-dammed lakes, ice-shelf moraines and valley glacier moraines, which we dated using cosmogenic nuclide ages. We provide one of the first detailed sediment-landform assemblage descriptions of epishelf lake shorelines. Marguerite Trough Ice Stream imprinted lateral moraines against eastern Alexander Island at 120 m at Ablation Point Massif. During deglaciation, lateral lakes formed in the Ablation and Moutonnée valleys, dammed against the ice stream in George VI Sound. Exposure ages from boulders on these shorelines yielded ages of 13.9 to 9.7 ka. Following recession of the ice stream, George VI Ice Shelf formed in George VI Sound. An epishelf lake formed at 15–20 m asl in Ablation and Moutonnée valleys, dated from 9.4 to 4.6 ka, suggesting that the lake was stable and persistent for some 5000 years. Lake-level lowering occurred after this, with the lake level at 12 m at 3.1 ± 0.4 ka and at 5 m asl today. A readvance of the valley glaciers on Alexander Island at 4.4 ± 0.7 ka is recorded by valley glacier moraines overlying epishelf lake sediments. We speculate that the glacier readvance, which occurred during a period of warmth, may have been caused by a dynamic response of the glaciers to a lowering in surface elevation of George VI Ice Shelf. |
format |
Article in Journal/Newspaper |
author |
Davies, BJ Hambrey, MJ Glasser, NF Holt, T Rodés, A Smellie, JL Carrivick, JL Blockley, SPE |
spellingShingle |
Davies, BJ Hambrey, MJ Glasser, NF Holt, T Rodés, A Smellie, JL Carrivick, JL Blockley, SPE Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula |
author_facet |
Davies, BJ Hambrey, MJ Glasser, NF Holt, T Rodés, A Smellie, JL Carrivick, JL Blockley, SPE |
author_sort |
Davies, BJ |
title |
Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula |
title_short |
Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula |
title_full |
Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula |
title_fullStr |
Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula |
title_full_unstemmed |
Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula |
title_sort |
ice-dammed lateral lake and epishelf lake insights into holocene dynamics of marguerite trough ice stream and george vi ice shelf, alexander island, antarctic peninsula |
publisher |
Elsevier |
publishDate |
2017 |
url |
https://eprints.whiterose.ac.uk/123988/ https://eprints.whiterose.ac.uk/123988/1/1-s2.0-S0277379117304651-main.pdf |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-67.840,-67.840,-71.692,-71.692) ENVELOPE(-68.000,-68.000,-71.000,-71.000) ENVELOPE(-68.333,-68.333,-70.799,-70.799) |
geographic |
Antarctic Antarctic Peninsula Marguerite Alexander Island George VI Ice Shelf George VI Sound Ablation Point |
geographic_facet |
Antarctic Antarctic Peninsula Marguerite Alexander Island George VI Ice Shelf George VI Sound Ablation Point |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf |
op_relation |
https://eprints.whiterose.ac.uk/123988/1/1-s2.0-S0277379117304651-main.pdf Davies, BJ, Hambrey, MJ, Glasser, NF et al. (5 more authors) (2017) Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula. Quaternary Science Reviews, 177. pp. 189-219. ISSN 0277-3791 |
_version_ |
1766267630571749376 |