Geological scatter of cosmogenic-nuclide exposure ages in the Shackleton Range, Antarctica: implications for glacial history
We use cosmogenic 26Al/10Be ratios in rocks from the Shackleton Range, Antarctica to investigate geological scatter, a challenge that faces exposure-age studies in Antarctica. Examining the scatter helps reveal the long-term lowering of Slessor Glacier, an outlet glacier of the East Antarctic Ice Sh...
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ftuglasgow:oai:eprints.gla.ac.uk:128404 2023-05-15T14:04:48+02:00 Geological scatter of cosmogenic-nuclide exposure ages in the Shackleton Range, Antarctica: implications for glacial history Hein, Andrew S. Fogwill, Christopher J. Sugden, David E. Xu, Sheng 2014-02 http://eprints.gla.ac.uk/128404/ unknown Elsevier Hein, A. S., Fogwill, C. J., Sugden, D. E. and Xu, S. <http://eprints.gla.ac.uk/view/author/12708.html> (2014) Geological scatter of cosmogenic-nuclide exposure ages in the Shackleton Range, Antarctica: implications for glacial history. Quaternary Geochronology <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Geochronology.html>, 19, pp. 52-66. (doi:10.1016/j.quageo.2013.03.008 <http://dx.doi.org/10.1016/j.quageo.2013.03.008>) Articles PeerReviewed 2014 ftuglasgow https://doi.org/10.1016/j.quageo.2013.03.008 2020-01-10T01:12:31Z We use cosmogenic 26Al/10Be ratios in rocks from the Shackleton Range, Antarctica to investigate geological scatter, a challenge that faces exposure-age studies in Antarctica. Examining the scatter helps reveal the long-term lowering of Slessor Glacier, an outlet glacier of the East Antarctic Ice Sheet (EAIS) which flows into the Weddell Sea embayment. 144 26Al and 10Be exposure ages from 72 samples are related to bedrock or clast sample characteristics and geomorphological measures of weathering, slope and stability. We explore this noisy dataset by using Principal Components Analysis (PCA) to identify patterns in the data. Despite noise, there exist correlations between age and degree of weathering and age and elevation above the adjacent ice surface. Clasts with young exposure ages have more complex exposure histories than those with old exposure ages. In terms of glacial history we show that (a) warm-based ice covered the upper slopes of the Shackleton Range millions of years ago and that the uplands have been mainly free of ice for more than 800 ka, (b) that Slessor Glacier's surface elevation was c. 150 m above present at c. 270 ka and c. 700 ka. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Slessor Glacier Weddell Sea University of Glasgow: Enlighten - Publications Antarctic East Antarctic Ice Sheet Shackleton Shackleton Range ENVELOPE(-26.000,-26.000,-80.833,-80.833) Slessor ENVELOPE(-64.967,-64.967,-66.517,-66.517) Slessor Glacier ENVELOPE(-26.000,-26.000,-79.833,-79.833) Weddell Weddell Sea Quaternary Geochronology 19 52 66 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
unknown |
description |
We use cosmogenic 26Al/10Be ratios in rocks from the Shackleton Range, Antarctica to investigate geological scatter, a challenge that faces exposure-age studies in Antarctica. Examining the scatter helps reveal the long-term lowering of Slessor Glacier, an outlet glacier of the East Antarctic Ice Sheet (EAIS) which flows into the Weddell Sea embayment. 144 26Al and 10Be exposure ages from 72 samples are related to bedrock or clast sample characteristics and geomorphological measures of weathering, slope and stability. We explore this noisy dataset by using Principal Components Analysis (PCA) to identify patterns in the data. Despite noise, there exist correlations between age and degree of weathering and age and elevation above the adjacent ice surface. Clasts with young exposure ages have more complex exposure histories than those with old exposure ages. In terms of glacial history we show that (a) warm-based ice covered the upper slopes of the Shackleton Range millions of years ago and that the uplands have been mainly free of ice for more than 800 ka, (b) that Slessor Glacier's surface elevation was c. 150 m above present at c. 270 ka and c. 700 ka. |
format |
Article in Journal/Newspaper |
author |
Hein, Andrew S. Fogwill, Christopher J. Sugden, David E. Xu, Sheng |
spellingShingle |
Hein, Andrew S. Fogwill, Christopher J. Sugden, David E. Xu, Sheng Geological scatter of cosmogenic-nuclide exposure ages in the Shackleton Range, Antarctica: implications for glacial history |
author_facet |
Hein, Andrew S. Fogwill, Christopher J. Sugden, David E. Xu, Sheng |
author_sort |
Hein, Andrew S. |
title |
Geological scatter of cosmogenic-nuclide exposure ages in the Shackleton Range, Antarctica: implications for glacial history |
title_short |
Geological scatter of cosmogenic-nuclide exposure ages in the Shackleton Range, Antarctica: implications for glacial history |
title_full |
Geological scatter of cosmogenic-nuclide exposure ages in the Shackleton Range, Antarctica: implications for glacial history |
title_fullStr |
Geological scatter of cosmogenic-nuclide exposure ages in the Shackleton Range, Antarctica: implications for glacial history |
title_full_unstemmed |
Geological scatter of cosmogenic-nuclide exposure ages in the Shackleton Range, Antarctica: implications for glacial history |
title_sort |
geological scatter of cosmogenic-nuclide exposure ages in the shackleton range, antarctica: implications for glacial history |
publisher |
Elsevier |
publishDate |
2014 |
url |
http://eprints.gla.ac.uk/128404/ |
long_lat |
ENVELOPE(-26.000,-26.000,-80.833,-80.833) ENVELOPE(-64.967,-64.967,-66.517,-66.517) ENVELOPE(-26.000,-26.000,-79.833,-79.833) |
geographic |
Antarctic East Antarctic Ice Sheet Shackleton Shackleton Range Slessor Slessor Glacier Weddell Weddell Sea |
geographic_facet |
Antarctic East Antarctic Ice Sheet Shackleton Shackleton Range Slessor Slessor Glacier Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Ice Sheet Slessor Glacier Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Slessor Glacier Weddell Sea |
op_relation |
Hein, A. S., Fogwill, C. J., Sugden, D. E. and Xu, S. <http://eprints.gla.ac.uk/view/author/12708.html> (2014) Geological scatter of cosmogenic-nuclide exposure ages in the Shackleton Range, Antarctica: implications for glacial history. Quaternary Geochronology <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Geochronology.html>, 19, pp. 52-66. (doi:10.1016/j.quageo.2013.03.008 <http://dx.doi.org/10.1016/j.quageo.2013.03.008>) |
op_doi |
https://doi.org/10.1016/j.quageo.2013.03.008 |
container_title |
Quaternary Geochronology |
container_volume |
19 |
container_start_page |
52 |
op_container_end_page |
66 |
_version_ |
1766276135620968448 |