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 km 2 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: | https://eprints.gla.ac.uk/7274/ https://doi.org/10.1016/j.palaeo.2007.10.010 |
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ftuglasgow:oai:eprints.gla.ac.uk:7274 2024-06-02T07:54:46+00:00 The Holocene history of George VI Ice Shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments Roberts, S.J. Hodgson, D.A. Bentley, M.J. Smith, J.A. Millar, I.L. Olive, V. Sugden, D.E. 2008-03-24 https://eprints.gla.ac.uk/7274/ https://doi.org/10.1016/j.palaeo.2007.10.010 unknown Elsevier BV Roberts, S.J., Hodgson, D.A., Bentley, M.J., Smith, J.A., Millar, I.L., Olive, V. <http://eprints.gla.ac.uk/view/author/12826.html> and Sugden, D.E. (2008) The Holocene history of George VI Ice Shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments. Palaeogeography, Palaeoclimatology, Palaeoecology <https://eprints.gla.ac.uk/view/journal_volume/Palaeogeography,_Palaeoclimatology,_Palaeoecology.html>, 259(2-3), pp. 258-283. (doi:10.1016/j.palaeo.2007.10.010 <https://doi.org/10.1016/j.palaeo.2007.10.010>) GE Environmental Sciences GB Physical geography Articles PeerReviewed 2008 ftuglasgow https://doi.org/10.1016/j.palaeo.2007.10.010 2024-05-06T15:05:45Z The Antarctic Peninsula has experienced a dramatic increase in temperature and the loss of ca. 14,000 km 2 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 University of Glasgow: Enlighten - Publications Ablation Lake ENVELOPE(-68.388,-68.388,-70.820,-70.820) Ablation Point ENVELOPE(-68.333,-68.333,-70.799,-70.799) Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Antarctic Antarctic Peninsula Citadel Bastion ENVELOPE(-68.525,-68.525,-71.988,-71.988) 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) Moutonnée Lake ENVELOPE(-68.334,-68.334,-70.866,-70.866) Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) The Antarctic Palaeogeography, Palaeoclimatology, Palaeoecology 259 2-3 258 283 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
unknown |
topic |
GE Environmental Sciences GB Physical geography |
spellingShingle |
GE Environmental Sciences GB Physical geography Roberts, S.J. Hodgson, D.A. Bentley, M.J. Smith, J.A. Millar, I.L. Olive, V. Sugden, D.E. The Holocene history of George VI Ice Shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments |
topic_facet |
GE Environmental Sciences GB Physical geography |
description |
The Antarctic Peninsula has experienced a dramatic increase in temperature and the loss of ca. 14,000 km 2 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, S.J. Hodgson, D.A. Bentley, M.J. Smith, J.A. Millar, I.L. Olive, V. Sugden, D.E. |
author_facet |
Roberts, S.J. Hodgson, D.A. Bentley, M.J. Smith, J.A. Millar, I.L. Olive, V. Sugden, D.E. |
author_sort |
Roberts, S.J. |
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 BV |
publishDate |
2008 |
url |
https://eprints.gla.ac.uk/7274/ https://doi.org/10.1016/j.palaeo.2007.10.010 |
long_lat |
ENVELOPE(-68.388,-68.388,-70.820,-70.820) ENVELOPE(-68.333,-68.333,-70.799,-70.799) ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-68.525,-68.525,-71.988,-71.988) ENVELOPE(-67.840,-67.840,-71.692,-71.692) ENVELOPE(-68.000,-68.000,-71.000,-71.000) ENVELOPE(-68.334,-68.334,-70.866,-70.866) ENVELOPE(-65.000,-65.000,-71.500,-71.500) |
geographic |
Ablation Lake Ablation Point Alexander Island Antarctic Antarctic Peninsula Citadel Bastion George VI Ice Shelf George VI Sound Moutonnée Lake Palmer Land The Antarctic |
geographic_facet |
Ablation Lake Ablation Point Alexander Island Antarctic Antarctic Peninsula Citadel Bastion George VI Ice Shelf George VI Sound Moutonnée Lake Palmer Land The Antarctic |
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 |
Roberts, S.J., Hodgson, D.A., Bentley, M.J., Smith, J.A., Millar, I.L., Olive, V. <http://eprints.gla.ac.uk/view/author/12826.html> and Sugden, D.E. (2008) The Holocene history of George VI Ice Shelf, Antarctic Peninsula from clast-provenance analysis of epishelf lake sediments. Palaeogeography, Palaeoclimatology, Palaeoecology <https://eprints.gla.ac.uk/view/journal_volume/Palaeogeography,_Palaeoclimatology,_Palaeoecology.html>, 259(2-3), pp. 258-283. (doi: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 |
_version_ |
1800743474605064192 |