Limited Pliocene/Pleistocene glaciation in Deep Freeze Range, northern Victoria Land, Antarctica, derived from in situ cosmogenic nuclides
The question of how stable the climate in Antarctica has been during the last few million years compared to the rest of the planet is still controversial. This study attempts to add new information to the discussion by reconstructing the timing and spatial extent of glacial advances in northern Vict...
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Online Access: | http://hdl.handle.net/11568/77789 https://doi.org/10.1017/S0954102003001603 |
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ftunivpisairis:oai:arpi.unipi.it:11568/77789 2024-02-11T09:58:00+01:00 Limited Pliocene/Pleistocene glaciation in Deep Freeze Range, northern Victoria Land, Antarctica, derived from in situ cosmogenic nuclides OBERHOLZER P SCHAEFER J. M OROMBELLI G IVY OCHS S KUBIK P. V BAUR H WIELER R. BARONI, CARLO Oberholzer, P Baroni, Carlo SCHAEFER J., M Orombelli, G IVY OCHS, S KUBIK P., V Baur, H Wieler, R. 2003 STAMPA http://hdl.handle.net/11568/77789 https://doi.org/10.1017/S0954102003001603 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000187366600011 volume:15 issue:4 firstpage:493 lastpage:502 numberofpages:10 journal:ANTARCTIC SCIENCE http://hdl.handle.net/11568/77789 doi:10.1017/S0954102003001603 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0346269341 East Antarctic Ice Sheet erosion rate glacial drift surface exposure dating landscape analysi Landscape evolution Terra Nova Bay Antarctica info:eu-repo/semantics/article 2003 ftunivpisairis https://doi.org/10.1017/S0954102003001603 2024-01-24T17:40:34Z The question of how stable the climate in Antarctica has been during the last few million years compared to the rest of the planet is still controversial. This study attempts to add new information to the discussion by reconstructing the timing and spatial extent of glacial advances in northern Victoria Land over tens of thousands to millions of years. In Terra Nova Bay region, surface exposure ages and erosion rates of glacially rounded bedrock and glacial erratics have been determined using the cosmogenic nuclides 3He, 10Be and 21Ne. Three morphological units have been analysed. They yield minimum ages of 11 to 34 ka, 309 ka, and 2.6 Ma, respectively. Erosion rates were as low as 20 cm Ma-1 since middle Pliocene time. Taking erosion into account, the oldest surface is 5.3 Ma old. Pleistocene glacier advances had considerable extent, reaching up to 780 m above modern ice levels, but have been restricted to the valleys since at least mid-Pliocene. The existence of landscapes of mid-Pliocene age in northern Victoria Land implies that the climatic stability of the McMurdo Dry Valleys is not unique within the Transantarctic Mountains, but rather the expression of a constantly cold and hyperarid climate regime in entire Victoria Land. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet McMurdo Dry Valleys Victoria Land ARPI - Archivio della Ricerca dell'Università di Pisa Antarctic Victoria Land McMurdo Dry Valleys East Antarctic Ice Sheet Terra Nova Bay Transantarctic Mountains Deep Freeze Range ENVELOPE(163.750,163.750,-74.250,-74.250) Antarctic Science 15 4 493 502 |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
topic |
East Antarctic Ice Sheet erosion rate glacial drift surface exposure dating landscape analysi Landscape evolution Terra Nova Bay Antarctica |
spellingShingle |
East Antarctic Ice Sheet erosion rate glacial drift surface exposure dating landscape analysi Landscape evolution Terra Nova Bay Antarctica OBERHOLZER P SCHAEFER J. M OROMBELLI G IVY OCHS S KUBIK P. V BAUR H WIELER R. BARONI, CARLO Limited Pliocene/Pleistocene glaciation in Deep Freeze Range, northern Victoria Land, Antarctica, derived from in situ cosmogenic nuclides |
topic_facet |
East Antarctic Ice Sheet erosion rate glacial drift surface exposure dating landscape analysi Landscape evolution Terra Nova Bay Antarctica |
description |
The question of how stable the climate in Antarctica has been during the last few million years compared to the rest of the planet is still controversial. This study attempts to add new information to the discussion by reconstructing the timing and spatial extent of glacial advances in northern Victoria Land over tens of thousands to millions of years. In Terra Nova Bay region, surface exposure ages and erosion rates of glacially rounded bedrock and glacial erratics have been determined using the cosmogenic nuclides 3He, 10Be and 21Ne. Three morphological units have been analysed. They yield minimum ages of 11 to 34 ka, 309 ka, and 2.6 Ma, respectively. Erosion rates were as low as 20 cm Ma-1 since middle Pliocene time. Taking erosion into account, the oldest surface is 5.3 Ma old. Pleistocene glacier advances had considerable extent, reaching up to 780 m above modern ice levels, but have been restricted to the valleys since at least mid-Pliocene. The existence of landscapes of mid-Pliocene age in northern Victoria Land implies that the climatic stability of the McMurdo Dry Valleys is not unique within the Transantarctic Mountains, but rather the expression of a constantly cold and hyperarid climate regime in entire Victoria Land. |
author2 |
Oberholzer, P Baroni, Carlo SCHAEFER J., M Orombelli, G IVY OCHS, S KUBIK P., V Baur, H Wieler, R. |
format |
Article in Journal/Newspaper |
author |
OBERHOLZER P SCHAEFER J. M OROMBELLI G IVY OCHS S KUBIK P. V BAUR H WIELER R. BARONI, CARLO |
author_facet |
OBERHOLZER P SCHAEFER J. M OROMBELLI G IVY OCHS S KUBIK P. V BAUR H WIELER R. BARONI, CARLO |
author_sort |
OBERHOLZER P |
title |
Limited Pliocene/Pleistocene glaciation in Deep Freeze Range, northern Victoria Land, Antarctica, derived from in situ cosmogenic nuclides |
title_short |
Limited Pliocene/Pleistocene glaciation in Deep Freeze Range, northern Victoria Land, Antarctica, derived from in situ cosmogenic nuclides |
title_full |
Limited Pliocene/Pleistocene glaciation in Deep Freeze Range, northern Victoria Land, Antarctica, derived from in situ cosmogenic nuclides |
title_fullStr |
Limited Pliocene/Pleistocene glaciation in Deep Freeze Range, northern Victoria Land, Antarctica, derived from in situ cosmogenic nuclides |
title_full_unstemmed |
Limited Pliocene/Pleistocene glaciation in Deep Freeze Range, northern Victoria Land, Antarctica, derived from in situ cosmogenic nuclides |
title_sort |
limited pliocene/pleistocene glaciation in deep freeze range, northern victoria land, antarctica, derived from in situ cosmogenic nuclides |
publishDate |
2003 |
url |
http://hdl.handle.net/11568/77789 https://doi.org/10.1017/S0954102003001603 |
long_lat |
ENVELOPE(163.750,163.750,-74.250,-74.250) |
geographic |
Antarctic Victoria Land McMurdo Dry Valleys East Antarctic Ice Sheet Terra Nova Bay Transantarctic Mountains Deep Freeze Range |
geographic_facet |
Antarctic Victoria Land McMurdo Dry Valleys East Antarctic Ice Sheet Terra Nova Bay Transantarctic Mountains Deep Freeze Range |
genre |
Antarc* Antarctic Antarctica Ice Sheet McMurdo Dry Valleys Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet McMurdo Dry Valleys Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000187366600011 volume:15 issue:4 firstpage:493 lastpage:502 numberofpages:10 journal:ANTARCTIC SCIENCE http://hdl.handle.net/11568/77789 doi:10.1017/S0954102003001603 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0346269341 |
op_doi |
https://doi.org/10.1017/S0954102003001603 |
container_title |
Antarctic Science |
container_volume |
15 |
container_issue |
4 |
container_start_page |
493 |
op_container_end_page |
502 |
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1790593559373545472 |