The Holocene history of George VI ice shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments
The Antarctic Peninsula has experienced a dramatic increase in temperature and the loss of ca. 14,000 km2 of ice-shelf area in recent years. During this time George VI Ice Shelf (GVIIS) has remained relatively intact, but it is now reaching its theoretical limit of viability. Epishelf lakes, formed...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/6767/ https://nora.nerc.ac.uk/id/eprint/6767/1/PPP_GVIIS%2520clasts_sjr_31-3-06_revised.pdf http://www.sciencedirect.com/science/journal/00310182 |
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ftnerc:oai:nora.nerc.ac.uk:6767 2023-05-15T13:15:16+02:00 The Holocene history of George VI ice shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments Roberts, Stephen Hodgson, Dominic Bentley, M.J. Smith, James Millar, Ian Olive, V. Sugden, David E. 2008 text http://nora.nerc.ac.uk/id/eprint/6767/ https://nora.nerc.ac.uk/id/eprint/6767/1/PPP_GVIIS%2520clasts_sjr_31-3-06_revised.pdf http://www.sciencedirect.com/science/journal/00310182 en eng Elsevier https://nora.nerc.ac.uk/id/eprint/6767/1/PPP_GVIIS%2520clasts_sjr_31-3-06_revised.pdf Roberts, Stephen orcid:0000-0003-3407-9127 Hodgson, Dominic orcid:0000-0002-3841-3746 Bentley, M.J.; Smith, James orcid:0000-0002-1333-2544 Millar, Ian; Olive, V.; Sugden, David E. 2008 The Holocene history of George VI ice shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments. Palaeogeography, Palaeoclimatology, Palaeoecology, 259 (2-3). 258-283. https://doi.org/10.1016/j.palaeo.2007.10.010 <https://doi.org/10.1016/j.palaeo.2007.10.010> Earth Sciences Publication - Article PeerReviewed 2008 ftnerc https://doi.org/10.1016/j.palaeo.2007.10.010 2023-02-04T19:24:26Z The Antarctic Peninsula has experienced a dramatic increase in temperature and the loss of ca. 14,000 km2 of ice-shelf area in recent years. During this time George VI Ice Shelf (GVIIS) has remained relatively intact, but it is now reaching its theoretical limit of viability. Epishelf lakes, formed when ice shelves dam the mouths of marine embayments, accumulate sediments that can be used to constrain past ice-shelf behaviour. They are stratified water bodies with an upper layer of fresh meltwater overlying a marine layer of water. Multi-proxy analysis of a sediment core from Moutonnée Lake, an epishelf lake dammed by GVIIS on the east coast of Alexander Island, has recently shown that it retreated to at least the Ablation Point area in the early Holocene, ca. 9600–7500 years BP, demonstrating its vulnerability to periods of atmospheric and oceanic warmth. This study tests this interpretation of ice-shelf collapse through detailed analyses of granulometric, geochemical and Sr and Nd isotope provenance data for > 8 mm clasts from the same cores. Clast data from Moutonnée Lake were compared with geological reference data from two further lakes on Alexander Island (Ablation Lake and Citadel Bastion Lake) and an extensive archive of rocks and isotope-geochemical provenance data from the Antarctic Peninsula region. Underpinning this provenance analysis is the contrast between the plutonic/igneous outcrops in Palmer Land on the western side and the predominantly sedimentary strata of Alexander Island on the eastern side of George VI Sound, and the different patterns in their deposition that would be expected at Moutonnée Lake during periods of ice-shelf presence and absence. Results show that changes in clast distribution and provenance reflect the early Holocene retreat and reformation of George VI Ice Shelf at Moutonnée Lake. The period of ice-shelf retreat was marked by the onset of marine conditions in the basin followed by a rapidly deposited zone of clasts whose provenance, distribution, varied lithology and ... Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf Ice Shelves Palmer Land Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) 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) Moutonnée Lake ENVELOPE(-68.334,-68.334,-70.866,-70.866) Ablation Lake ENVELOPE(-68.388,-68.388,-70.820,-70.820) Citadel Bastion ENVELOPE(-68.525,-68.525,-71.988,-71.988) Palaeogeography, Palaeoclimatology, Palaeoecology 259 2-3 258 283 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Roberts, Stephen Hodgson, Dominic Bentley, M.J. Smith, James Millar, Ian Olive, V. Sugden, David E. The Holocene history of George VI ice shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments |
topic_facet |
Earth Sciences |
description |
The Antarctic Peninsula has experienced a dramatic increase in temperature and the loss of ca. 14,000 km2 of ice-shelf area in recent years. During this time George VI Ice Shelf (GVIIS) has remained relatively intact, but it is now reaching its theoretical limit of viability. Epishelf lakes, formed when ice shelves dam the mouths of marine embayments, accumulate sediments that can be used to constrain past ice-shelf behaviour. They are stratified water bodies with an upper layer of fresh meltwater overlying a marine layer of water. Multi-proxy analysis of a sediment core from Moutonnée Lake, an epishelf lake dammed by GVIIS on the east coast of Alexander Island, has recently shown that it retreated to at least the Ablation Point area in the early Holocene, ca. 9600–7500 years BP, demonstrating its vulnerability to periods of atmospheric and oceanic warmth. This study tests this interpretation of ice-shelf collapse through detailed analyses of granulometric, geochemical and Sr and Nd isotope provenance data for > 8 mm clasts from the same cores. Clast data from Moutonnée Lake were compared with geological reference data from two further lakes on Alexander Island (Ablation Lake and Citadel Bastion Lake) and an extensive archive of rocks and isotope-geochemical provenance data from the Antarctic Peninsula region. Underpinning this provenance analysis is the contrast between the plutonic/igneous outcrops in Palmer Land on the western side and the predominantly sedimentary strata of Alexander Island on the eastern side of George VI Sound, and the different patterns in their deposition that would be expected at Moutonnée Lake during periods of ice-shelf presence and absence. Results show that changes in clast distribution and provenance reflect the early Holocene retreat and reformation of George VI Ice Shelf at Moutonnée Lake. The period of ice-shelf retreat was marked by the onset of marine conditions in the basin followed by a rapidly deposited zone of clasts whose provenance, distribution, varied lithology and ... |
format |
Article in Journal/Newspaper |
author |
Roberts, Stephen Hodgson, Dominic Bentley, M.J. Smith, James Millar, Ian Olive, V. Sugden, David E. |
author_facet |
Roberts, Stephen Hodgson, Dominic Bentley, M.J. Smith, James Millar, Ian Olive, V. Sugden, David E. |
author_sort |
Roberts, Stephen |
title |
The Holocene history of George VI ice shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments |
title_short |
The Holocene history of George VI ice shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments |
title_full |
The Holocene history of George VI ice shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments |
title_fullStr |
The Holocene history of George VI ice shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments |
title_full_unstemmed |
The Holocene history of George VI ice shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments |
title_sort |
holocene history of george vi ice shelf, antarctic peninsula from clast-provenance analysis of epishelf lake sediments |
publisher |
Elsevier |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/6767/ https://nora.nerc.ac.uk/id/eprint/6767/1/PPP_GVIIS%2520clasts_sjr_31-3-06_revised.pdf http://www.sciencedirect.com/science/journal/00310182 |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-65.000,-65.000,-71.500,-71.500) 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) ENVELOPE(-68.334,-68.334,-70.866,-70.866) ENVELOPE(-68.388,-68.388,-70.820,-70.820) ENVELOPE(-68.525,-68.525,-71.988,-71.988) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Alexander Island Palmer Land George VI Ice Shelf George VI Sound Ablation Point Moutonnée Lake Ablation Lake Citadel Bastion |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Alexander Island Palmer Land George VI Ice Shelf George VI Sound Ablation Point Moutonnée Lake Ablation Lake Citadel Bastion |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf Ice Shelves Palmer Land |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf Ice Shelves Palmer Land |
op_relation |
https://nora.nerc.ac.uk/id/eprint/6767/1/PPP_GVIIS%2520clasts_sjr_31-3-06_revised.pdf Roberts, Stephen orcid:0000-0003-3407-9127 Hodgson, Dominic orcid:0000-0002-3841-3746 Bentley, M.J.; Smith, James orcid:0000-0002-1333-2544 Millar, Ian; Olive, V.; Sugden, David E. 2008 The Holocene history of George VI ice shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments. Palaeogeography, Palaeoclimatology, Palaeoecology, 259 (2-3). 258-283. https://doi.org/10.1016/j.palaeo.2007.10.010 <https://doi.org/10.1016/j.palaeo.2007.10.010> |
op_doi |
https://doi.org/10.1016/j.palaeo.2007.10.010 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
259 |
container_issue |
2-3 |
container_start_page |
258 |
op_container_end_page |
283 |
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1766267849442066432 |