Surface exposure ages imply multiple low-amplitude Pleistocene variations in East Antarctic Ice Sheet, Ricker Hills, Victoria Land
One of the major issues in (palaeo-) climatology is the response of Antarctic ice sheets to global climate changes. Antarctic ice volume has varied in the past but the extent and timing of these fluctuations are not well known. In this study, we address the question of amplitude and timing of past A...
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Online Access: | http://hdl.handle.net/11568/201330 https://doi.org/10.1017/S0954102008001478 |
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ftunivpisairis:oai:arpi.unipi.it:11568/201330 2024-04-14T08:04:03+00:00 Surface exposure ages imply multiple low-amplitude Pleistocene variations in East Antarctic Ice Sheet, Ricker Hills, Victoria Land STRASKY S. DI NICOLA L. BAUR H. KUBIK P. SCHLUECHTER C. WIELER R. BARONI, CARLO SALVATORE, MARIA CRISTINA Strasky, S. DI NICOLA, L. Baroni, Carlo Salvatore, MARIA CRISTINA Baur, H. Kubik, P. Schluechter, C. Wieler, R. 2009 STAMPA http://hdl.handle.net/11568/201330 https://doi.org/10.1017/S0954102008001478 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000263389100005 volume:21 issue:1 firstpage:59 lastpage:69 numberofpages:11 journal:ANTARCTIC SCIENCE http://hdl.handle.net/11568/201330 doi:10.1017/S0954102008001478 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-67649226448 cosmogenic nuclide erosion rate glacial drift Landscape evolution surface exposure dating Victoria Land Antarctica info:eu-repo/semantics/article 2009 ftunivpisairis https://doi.org/10.1017/S0954102008001478 2024-03-21T18:41:05Z One of the major issues in (palaeo-) climatology is the response of Antarctic ice sheets to global climate changes. Antarctic ice volume has varied in the past but the extent and timing of these fluctuations are not well known. In this study, we address the question of amplitude and timing of past Antarctic ice level changes by surface exposure dating using in situ produced cosmogenic nuclides (10Be and 21Ne). The study area lies in the Ricker Hills, a nunatak at the boundary of the East Antarctic Ice Sheet in southern Victoria Land. By determining exposure ages of erratic boulders from glacial drifts we directly date East Antarctic Ice Sheet variations. Erosion-corrected neon and beryllium exposure ages indicate that a major ice advance reaching elevations of about 500 m above present ice levels occurred between 1.125 and 1.375 million years before present. Subsequent ice fluctuations were of lesser extent but timing is difficult as all erratic boulders from related deposits show complex exposure histories. Sample-specific erosion rates were on the order of 20–45 cm Ma-1 for a quartzite and 10–65 cm Ma-1 for a sandstone boulder and imply that the modern cold, arid climate has persisted since at least the early Pleistocene. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Victoria Land ARPI - Archivio della Ricerca dell'Università di Pisa Antarctic East Antarctic Ice Sheet Ricker Hills ENVELOPE(159.167,159.167,-75.683,-75.683) Victoria Land Antarctic Science 21 1 59 69 |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
topic |
cosmogenic nuclide erosion rate glacial drift Landscape evolution surface exposure dating Victoria Land Antarctica |
spellingShingle |
cosmogenic nuclide erosion rate glacial drift Landscape evolution surface exposure dating Victoria Land Antarctica STRASKY S. DI NICOLA L. BAUR H. KUBIK P. SCHLUECHTER C. WIELER R. BARONI, CARLO SALVATORE, MARIA CRISTINA Surface exposure ages imply multiple low-amplitude Pleistocene variations in East Antarctic Ice Sheet, Ricker Hills, Victoria Land |
topic_facet |
cosmogenic nuclide erosion rate glacial drift Landscape evolution surface exposure dating Victoria Land Antarctica |
description |
One of the major issues in (palaeo-) climatology is the response of Antarctic ice sheets to global climate changes. Antarctic ice volume has varied in the past but the extent and timing of these fluctuations are not well known. In this study, we address the question of amplitude and timing of past Antarctic ice level changes by surface exposure dating using in situ produced cosmogenic nuclides (10Be and 21Ne). The study area lies in the Ricker Hills, a nunatak at the boundary of the East Antarctic Ice Sheet in southern Victoria Land. By determining exposure ages of erratic boulders from glacial drifts we directly date East Antarctic Ice Sheet variations. Erosion-corrected neon and beryllium exposure ages indicate that a major ice advance reaching elevations of about 500 m above present ice levels occurred between 1.125 and 1.375 million years before present. Subsequent ice fluctuations were of lesser extent but timing is difficult as all erratic boulders from related deposits show complex exposure histories. Sample-specific erosion rates were on the order of 20–45 cm Ma-1 for a quartzite and 10–65 cm Ma-1 for a sandstone boulder and imply that the modern cold, arid climate has persisted since at least the early Pleistocene. |
author2 |
Strasky, S. DI NICOLA, L. Baroni, Carlo Salvatore, MARIA CRISTINA Baur, H. Kubik, P. Schluechter, C. Wieler, R. |
format |
Article in Journal/Newspaper |
author |
STRASKY S. DI NICOLA L. BAUR H. KUBIK P. SCHLUECHTER C. WIELER R. BARONI, CARLO SALVATORE, MARIA CRISTINA |
author_facet |
STRASKY S. DI NICOLA L. BAUR H. KUBIK P. SCHLUECHTER C. WIELER R. BARONI, CARLO SALVATORE, MARIA CRISTINA |
author_sort |
STRASKY S. |
title |
Surface exposure ages imply multiple low-amplitude Pleistocene variations in East Antarctic Ice Sheet, Ricker Hills, Victoria Land |
title_short |
Surface exposure ages imply multiple low-amplitude Pleistocene variations in East Antarctic Ice Sheet, Ricker Hills, Victoria Land |
title_full |
Surface exposure ages imply multiple low-amplitude Pleistocene variations in East Antarctic Ice Sheet, Ricker Hills, Victoria Land |
title_fullStr |
Surface exposure ages imply multiple low-amplitude Pleistocene variations in East Antarctic Ice Sheet, Ricker Hills, Victoria Land |
title_full_unstemmed |
Surface exposure ages imply multiple low-amplitude Pleistocene variations in East Antarctic Ice Sheet, Ricker Hills, Victoria Land |
title_sort |
surface exposure ages imply multiple low-amplitude pleistocene variations in east antarctic ice sheet, ricker hills, victoria land |
publishDate |
2009 |
url |
http://hdl.handle.net/11568/201330 https://doi.org/10.1017/S0954102008001478 |
long_lat |
ENVELOPE(159.167,159.167,-75.683,-75.683) |
geographic |
Antarctic East Antarctic Ice Sheet Ricker Hills Victoria Land |
geographic_facet |
Antarctic East Antarctic Ice Sheet Ricker Hills Victoria Land |
genre |
Antarc* Antarctic Antarctica Ice Sheet Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000263389100005 volume:21 issue:1 firstpage:59 lastpage:69 numberofpages:11 journal:ANTARCTIC SCIENCE http://hdl.handle.net/11568/201330 doi:10.1017/S0954102008001478 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-67649226448 |
op_doi |
https://doi.org/10.1017/S0954102008001478 |
container_title |
Antarctic Science |
container_volume |
21 |
container_issue |
1 |
container_start_page |
59 |
op_container_end_page |
69 |
_version_ |
1796300418409562112 |