Constraints to the amplitude of Pleistocene ice level variations in the Transantarctic Mountains from glacial geomorphologic mapping and surface exposure dating
Did the volume of the Antarctic ice cover fluctuate synchronously to the past climate changes that occurred in the northern hemisphere? Or have the southern ice sheets remained unaffected by these partly abrupt warming and cooling events? The glacial deposits at the margin of the East Antarctic Ice...
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ftunivpisairis:oai:arpi.unipi.it:11568/79682 2024-02-11T09:56:30+01:00 Constraints to the amplitude of Pleistocene ice level variations in the Transantarctic Mountains from glacial geomorphologic mapping and surface exposure dating OBERHOLTZER P. BAUR H. WIELER R. BARONI, CARLO SALVATORE, MARIA CRISTINA - Oberholtzer, P. Baroni, Carlo Salvatore, MARIA CRISTINA Baur, H. Wieler, R. 2003 STAMPA http://hdl.handle.net/11568/79682 eng eng Desert Research Institute, Nevada country:USA place:Reno info:eu-repo/semantics/altIdentifier/isbn/9780945920519 ispartofbook:XVI INQUA Congress - Programs with abstracts XVI INQUA firstpage:237 lastpage:237 numberofpages:238 http://hdl.handle.net/11568/79682 glacial geomorphologic mapping exposure dating ice level variation Pleistocene Transantarctic Mountain East Antarctica info:eu-repo/semantics/conferenceObject 2003 ftunivpisairis 2024-01-17T17:43:03Z Did the volume of the Antarctic ice cover fluctuate synchronously to the past climate changes that occurred in the northern hemisphere? Or have the southern ice sheets remained unaffected by these partly abrupt warming and cooling events? The glacial deposits at the margin of the East Antarctic Ice Sheet (EAIS) reflect volume changes of the inland ice in the past.We have mapped glacial landforms on nunataks and in other ice-free areas along the Transantarctic Mountains within an project ongoing since 1996. The result is a series of 1:250,000 scale geomorphological and glaciological maps showing in detail the distribution of glacier and sea ice features, glacial, periglacial, aeolian and weathering landforms and deposits. At least five glacial drifts at different elevations have been differentiated and correlated over large areas. In addition, we have dated erosional and depositional glacial features at selected sites by surface exposure dating with in-situ produced cosmogenic He-3 and Ne-21. At the Ricker Hills, situated 100 km inland west from the Ross Sea coast, we obtain new exposure ages ranging between 160 and 680 ka. The combination of mapping and dating allows the conclusion that the EAIS did undergo surface level changes throughout the Pleistocene, but that these have been of limited amplitude, up to 500 m on Ricker Hills. This agrees with findings from further north in Northern Victoria Land. More datings from the same and other sites are in progress. Conference Object Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ross Sea Sea ice Victoria Land ARPI - Archivio della Ricerca dell'Università di Pisa Antarctic The Antarctic East Antarctica Ross Sea Victoria Land East Antarctic Ice Sheet Transantarctic Mountains Ricker Hills ENVELOPE(159.167,159.167,-75.683,-75.683) |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
topic |
glacial geomorphologic mapping exposure dating ice level variation Pleistocene Transantarctic Mountain East Antarctica |
spellingShingle |
glacial geomorphologic mapping exposure dating ice level variation Pleistocene Transantarctic Mountain East Antarctica OBERHOLTZER P. BAUR H. WIELER R. BARONI, CARLO SALVATORE, MARIA CRISTINA Constraints to the amplitude of Pleistocene ice level variations in the Transantarctic Mountains from glacial geomorphologic mapping and surface exposure dating |
topic_facet |
glacial geomorphologic mapping exposure dating ice level variation Pleistocene Transantarctic Mountain East Antarctica |
description |
Did the volume of the Antarctic ice cover fluctuate synchronously to the past climate changes that occurred in the northern hemisphere? Or have the southern ice sheets remained unaffected by these partly abrupt warming and cooling events? The glacial deposits at the margin of the East Antarctic Ice Sheet (EAIS) reflect volume changes of the inland ice in the past.We have mapped glacial landforms on nunataks and in other ice-free areas along the Transantarctic Mountains within an project ongoing since 1996. The result is a series of 1:250,000 scale geomorphological and glaciological maps showing in detail the distribution of glacier and sea ice features, glacial, periglacial, aeolian and weathering landforms and deposits. At least five glacial drifts at different elevations have been differentiated and correlated over large areas. In addition, we have dated erosional and depositional glacial features at selected sites by surface exposure dating with in-situ produced cosmogenic He-3 and Ne-21. At the Ricker Hills, situated 100 km inland west from the Ross Sea coast, we obtain new exposure ages ranging between 160 and 680 ka. The combination of mapping and dating allows the conclusion that the EAIS did undergo surface level changes throughout the Pleistocene, but that these have been of limited amplitude, up to 500 m on Ricker Hills. This agrees with findings from further north in Northern Victoria Land. More datings from the same and other sites are in progress. |
author2 |
- Oberholtzer, P. Baroni, Carlo Salvatore, MARIA CRISTINA Baur, H. Wieler, R. |
format |
Conference Object |
author |
OBERHOLTZER P. BAUR H. WIELER R. BARONI, CARLO SALVATORE, MARIA CRISTINA |
author_facet |
OBERHOLTZER P. BAUR H. WIELER R. BARONI, CARLO SALVATORE, MARIA CRISTINA |
author_sort |
OBERHOLTZER P. |
title |
Constraints to the amplitude of Pleistocene ice level variations in the Transantarctic Mountains from glacial geomorphologic mapping and surface exposure dating |
title_short |
Constraints to the amplitude of Pleistocene ice level variations in the Transantarctic Mountains from glacial geomorphologic mapping and surface exposure dating |
title_full |
Constraints to the amplitude of Pleistocene ice level variations in the Transantarctic Mountains from glacial geomorphologic mapping and surface exposure dating |
title_fullStr |
Constraints to the amplitude of Pleistocene ice level variations in the Transantarctic Mountains from glacial geomorphologic mapping and surface exposure dating |
title_full_unstemmed |
Constraints to the amplitude of Pleistocene ice level variations in the Transantarctic Mountains from glacial geomorphologic mapping and surface exposure dating |
title_sort |
constraints to the amplitude of pleistocene ice level variations in the transantarctic mountains from glacial geomorphologic mapping and surface exposure dating |
publisher |
Desert Research Institute, Nevada |
publishDate |
2003 |
url |
http://hdl.handle.net/11568/79682 |
long_lat |
ENVELOPE(159.167,159.167,-75.683,-75.683) |
geographic |
Antarctic The Antarctic East Antarctica Ross Sea Victoria Land East Antarctic Ice Sheet Transantarctic Mountains Ricker Hills |
geographic_facet |
Antarctic The Antarctic East Antarctica Ross Sea Victoria Land East Antarctic Ice Sheet Transantarctic Mountains Ricker Hills |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ross Sea Sea ice Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ross Sea Sea ice Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/isbn/9780945920519 ispartofbook:XVI INQUA Congress - Programs with abstracts XVI INQUA firstpage:237 lastpage:237 numberofpages:238 http://hdl.handle.net/11568/79682 |
_version_ |
1790603686965149696 |