Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica
The timing and magnitude of Holocene glacial oscillations in most currently ice-free areas of Antarctica remain unknown. This work focuses on the recent deglaciation in the northern sector of the Fildes Peninsula, King George Island, northern Antarctic Peninsula. The ice cap covering ca. 90% of the...
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Online Access: | http://hdl.handle.net/10451/58388 https://doi.org/10.1002/ldr.4730 |
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ftunivlisboa:oai:repositorio.ul.pt:10451/58388 2023-07-23T04:14:52+02:00 Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica Oliva, Marc Palacios, David Fernández-Fernández, Jose M. Fernandes, Marcelo Schimmelpfennig, Irene Vieira, Gonçalo Antoniades, Dermot Pérez‐Alberti, Augusto García‐Oteyza, Julia 2023-06-28T12:02:30Z http://hdl.handle.net/10451/58388 https://doi.org/10.1002/ldr.4730 eng eng Wiley 02/SAICT/2017 – 32002 info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00295%2F2020/PT https://onlinelibrary.wiley.com/doi/10.1002/ldr.4730 Oliva, M., Palacios, D., Fernández-Fernández, J. M., Fernandes, M., Schimmelpfennig, I., Vieira, G., Antoniades, D., Pérez-Alberti, A., García-Oteyza, J. & ASTER TEAM (2023). Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica. Land Degradation & Development, 1– 18. https://doi.org/10.1002/ldr.4730 1099-145X http://hdl.handle.net/10451/58388 doi:10.1002/ldr.4730 openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Antarctica Cosmic-ray exposure dating Deglaciation Fildes Peninsula Holocene Thermal Maximum article 2023 ftunivlisboa https://doi.org/10.1002/ldr.4730 2023-07-05T00:07:48Z The timing and magnitude of Holocene glacial oscillations in most currently ice-free areas of Antarctica remain unknown. This work focuses on the recent deglaciation in the northern sector of the Fildes Peninsula, King George Island, northern Antarctic Peninsula. The ice cap covering ca. 90% of the island has receded since the Last Glacial Maximum and exposed ca. 29 km2 of ice-free land. We reconstruct its glacial history based on a dataset of 12 36Cl exposure ages obtained through cosmic-ray exposure (CRE) dating of moraine boulders, polished surfaces and erratic boulders surrounding the peninsula's northern plateau. Results reveal that the deglaciation of the northern Fildes Peninsula took place during the Holocene Thermal Maximum at 7–6 ka, when warm conditions promoted a massive glacial retreat. The present arrangement of ice-free areas was in place by 6 ka. Small cirque moraines suggest the subsequent occurrence of favourable climate conditions for glacial expansion fed by intense snow deflation at 4.6 and 1 ka at the foot of the northern plateau. The deglaciation pattern of the Fildes Peninsula resulted from the combined shrinkage of different ice masses, rather than of the long-term retreat of the King George Ice Cap. No evidence of glacier expansion during more recent cold periods (i.e. the Little Ice Age) was found. These results fit well with regional deglacial histories inferred from lacustrine sediments and raised beaches and complement the existing chronological framework to help better understand the peninsula's Holocene geoecological dynamics. info:eu-repo/semantics/acceptedVersion Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice cap King George Island Universidade de Lisboa: repositório.UL Antarctic Antarctic Peninsula Fildes ENVELOPE(-58.817,-58.817,-62.217,-62.217) Fildes peninsula ENVELOPE(-58.948,-58.948,-62.182,-62.182) King George Island Land Degradation & Development |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Antarctica Cosmic-ray exposure dating Deglaciation Fildes Peninsula Holocene Thermal Maximum |
spellingShingle |
Antarctica Cosmic-ray exposure dating Deglaciation Fildes Peninsula Holocene Thermal Maximum Oliva, Marc Palacios, David Fernández-Fernández, Jose M. Fernandes, Marcelo Schimmelpfennig, Irene Vieira, Gonçalo Antoniades, Dermot Pérez‐Alberti, Augusto García‐Oteyza, Julia Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica |
topic_facet |
Antarctica Cosmic-ray exposure dating Deglaciation Fildes Peninsula Holocene Thermal Maximum |
description |
The timing and magnitude of Holocene glacial oscillations in most currently ice-free areas of Antarctica remain unknown. This work focuses on the recent deglaciation in the northern sector of the Fildes Peninsula, King George Island, northern Antarctic Peninsula. The ice cap covering ca. 90% of the island has receded since the Last Glacial Maximum and exposed ca. 29 km2 of ice-free land. We reconstruct its glacial history based on a dataset of 12 36Cl exposure ages obtained through cosmic-ray exposure (CRE) dating of moraine boulders, polished surfaces and erratic boulders surrounding the peninsula's northern plateau. Results reveal that the deglaciation of the northern Fildes Peninsula took place during the Holocene Thermal Maximum at 7–6 ka, when warm conditions promoted a massive glacial retreat. The present arrangement of ice-free areas was in place by 6 ka. Small cirque moraines suggest the subsequent occurrence of favourable climate conditions for glacial expansion fed by intense snow deflation at 4.6 and 1 ka at the foot of the northern plateau. The deglaciation pattern of the Fildes Peninsula resulted from the combined shrinkage of different ice masses, rather than of the long-term retreat of the King George Ice Cap. No evidence of glacier expansion during more recent cold periods (i.e. the Little Ice Age) was found. These results fit well with regional deglacial histories inferred from lacustrine sediments and raised beaches and complement the existing chronological framework to help better understand the peninsula's Holocene geoecological dynamics. info:eu-repo/semantics/acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Oliva, Marc Palacios, David Fernández-Fernández, Jose M. Fernandes, Marcelo Schimmelpfennig, Irene Vieira, Gonçalo Antoniades, Dermot Pérez‐Alberti, Augusto García‐Oteyza, Julia |
author_facet |
Oliva, Marc Palacios, David Fernández-Fernández, Jose M. Fernandes, Marcelo Schimmelpfennig, Irene Vieira, Gonçalo Antoniades, Dermot Pérez‐Alberti, Augusto García‐Oteyza, Julia |
author_sort |
Oliva, Marc |
title |
Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica |
title_short |
Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica |
title_full |
Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica |
title_fullStr |
Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica |
title_full_unstemmed |
Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica |
title_sort |
holocene deglaciation of the northern fildes peninsula, king george island, antarctica |
publisher |
Wiley |
publishDate |
2023 |
url |
http://hdl.handle.net/10451/58388 https://doi.org/10.1002/ldr.4730 |
long_lat |
ENVELOPE(-58.817,-58.817,-62.217,-62.217) ENVELOPE(-58.948,-58.948,-62.182,-62.182) |
geographic |
Antarctic Antarctic Peninsula Fildes Fildes peninsula King George Island |
geographic_facet |
Antarctic Antarctic Peninsula Fildes Fildes peninsula King George Island |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice cap King George Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice cap King George Island |
op_relation |
02/SAICT/2017 – 32002 info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00295%2F2020/PT https://onlinelibrary.wiley.com/doi/10.1002/ldr.4730 Oliva, M., Palacios, D., Fernández-Fernández, J. M., Fernandes, M., Schimmelpfennig, I., Vieira, G., Antoniades, D., Pérez-Alberti, A., García-Oteyza, J. & ASTER TEAM (2023). Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica. Land Degradation & Development, 1– 18. https://doi.org/10.1002/ldr.4730 1099-145X http://hdl.handle.net/10451/58388 doi:10.1002/ldr.4730 |
op_rights |
openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1002/ldr.4730 |
container_title |
Land Degradation & Development |
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1772187949481328640 |