Dating late Cenozoic erosional surfaces in Victoria Land, Antarctica, with cosmogenic neon in pyroxenes
Abstract We present 21 Ne exposure ages of erosional glaciogenic rock surfaces on nunataks in northern Victoria Land, Antarctica: i) in the Prince Albert Mountains and ii) near Mesa Range. These nunataks are located directly at the margin of the polar plateau and therefore provide an immediate recor...
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Online Access: | http://dx.doi.org/10.1017/s095410200700079x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410200700079X |
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crcambridgeupr:10.1017/s095410200700079x 2024-04-28T08:02:19+00:00 Dating late Cenozoic erosional surfaces in Victoria Land, Antarctica, with cosmogenic neon in pyroxenes Oberholzer, P. Baroni, C. Salvatore, M.C. Baur, H. Wieler, R. 2007 http://dx.doi.org/10.1017/s095410200700079x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410200700079X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 20, issue 1, page 89-98 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2007 crcambridgeupr https://doi.org/10.1017/s095410200700079x 2024-04-09T06:56:19Z Abstract We present 21 Ne exposure ages of erosional glaciogenic rock surfaces on nunataks in northern Victoria Land, Antarctica: i) in the Prince Albert Mountains and ii) near Mesa Range. These nunataks are located directly at the margin of the polar plateau and therefore provide an immediate record of ice volume changes of the East Antarctic Ice Sheet, not biased by ice shelf grounding or narrow valley sections downstream the outlet glaciers. The sampling locations overlook the present ice surface by less than 200 m, but were last covered by ice 3.5 Ma bp (minimum age, not corrected for erosion). This strongly indicates that the ice sheet has not been substantially thicker than today since at least the early Pliocene, which supports the hypothesis of a stable East Antarctic Ice Sheet. First absolute ages are reported for the alpine topography above the erosive trimline that typically marks the upper limit of glacial activity in northern Victoria Land. Unexpectedly low nuclide concentrations suggest that erosion rates on the alpine topography are considerably higher due to the steep slopes than those affecting flat erosional surfaces carrying Antarctic tors. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Antarctica Ice Sheet Ice Shelf Victoria Land Cambridge University Press Antarctic Science 20 1 89 98 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Oberholzer, P. Baroni, C. Salvatore, M.C. Baur, H. Wieler, R. Dating late Cenozoic erosional surfaces in Victoria Land, Antarctica, with cosmogenic neon in pyroxenes |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract We present 21 Ne exposure ages of erosional glaciogenic rock surfaces on nunataks in northern Victoria Land, Antarctica: i) in the Prince Albert Mountains and ii) near Mesa Range. These nunataks are located directly at the margin of the polar plateau and therefore provide an immediate record of ice volume changes of the East Antarctic Ice Sheet, not biased by ice shelf grounding or narrow valley sections downstream the outlet glaciers. The sampling locations overlook the present ice surface by less than 200 m, but were last covered by ice 3.5 Ma bp (minimum age, not corrected for erosion). This strongly indicates that the ice sheet has not been substantially thicker than today since at least the early Pliocene, which supports the hypothesis of a stable East Antarctic Ice Sheet. First absolute ages are reported for the alpine topography above the erosive trimline that typically marks the upper limit of glacial activity in northern Victoria Land. Unexpectedly low nuclide concentrations suggest that erosion rates on the alpine topography are considerably higher due to the steep slopes than those affecting flat erosional surfaces carrying Antarctic tors. |
format |
Article in Journal/Newspaper |
author |
Oberholzer, P. Baroni, C. Salvatore, M.C. Baur, H. Wieler, R. |
author_facet |
Oberholzer, P. Baroni, C. Salvatore, M.C. Baur, H. Wieler, R. |
author_sort |
Oberholzer, P. |
title |
Dating late Cenozoic erosional surfaces in Victoria Land, Antarctica, with cosmogenic neon in pyroxenes |
title_short |
Dating late Cenozoic erosional surfaces in Victoria Land, Antarctica, with cosmogenic neon in pyroxenes |
title_full |
Dating late Cenozoic erosional surfaces in Victoria Land, Antarctica, with cosmogenic neon in pyroxenes |
title_fullStr |
Dating late Cenozoic erosional surfaces in Victoria Land, Antarctica, with cosmogenic neon in pyroxenes |
title_full_unstemmed |
Dating late Cenozoic erosional surfaces in Victoria Land, Antarctica, with cosmogenic neon in pyroxenes |
title_sort |
dating late cenozoic erosional surfaces in victoria land, antarctica, with cosmogenic neon in pyroxenes |
publisher |
Cambridge University Press (CUP) |
publishDate |
2007 |
url |
http://dx.doi.org/10.1017/s095410200700079x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410200700079X |
genre |
Antarc* Antarctic Antarctic Science Antarctica Ice Sheet Ice Shelf Victoria Land |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctica Ice Sheet Ice Shelf Victoria Land |
op_source |
Antarctic Science volume 20, issue 1, page 89-98 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s095410200700079x |
container_title |
Antarctic Science |
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20 |
container_issue |
1 |
container_start_page |
89 |
op_container_end_page |
98 |
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1797573722225246208 |