Limited ice-sheet erosion and complex exposure histories derived from in situ cosmogenic 10Be, 26Al, and 14C on Baffin Island, Arctic Canada
Discordant cosmogenic nuclide exposure ages derived from 10Be, 26Al, and 14C extracted from quartz in rocky summits along the eastern rim of the central Baffin Island plateau provide constraints on the efficiency of erosion by the Laurentide Ice Sheet (LIS) and on the timing and duration of ice-free...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.595.552 2023-05-15T14:53:35+02:00 Limited ice-sheet erosion and complex exposure histories derived from in situ cosmogenic 10Be, 26Al, and 14C on Baffin Island, Arctic Canada Gifford H. Millera Jason P. Brinerb Nathaniel A. Liftonc Robert C. Finkeld The Pennsylvania State University CiteSeerX Archives 2006 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.552 http://www.glyfac.buffalo.edu/Faculty/briner/buf/pubs/Miller_et_al_2006.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.552 http://www.glyfac.buffalo.edu/Faculty/briner/buf/pubs/Miller_et_al_2006.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.glyfac.buffalo.edu/Faculty/briner/buf/pubs/Miller_et_al_2006.pdf Cosmogenic nuclide exposure dating Arctic Baffin Island Glacial history Interglaciation Erosion text 2006 ftciteseerx 2016-01-08T13:43:02Z Discordant cosmogenic nuclide exposure ages derived from 10Be, 26Al, and 14C extracted from quartz in rocky summits along the eastern rim of the central Baffin Island plateau provide constraints on the efficiency of erosion by the Laurentide Ice Sheet (LIS) and on the timing and duration of ice-free conditions in the eastern Canadian Arctic. In situ 14C records the duration of exposure during the present interglaciation; any previously acquired 14C decayed below detection limits beneath thick LIS during the last glaciation. The in situ 14C exposure ages for two samples adjacent to a cold-based local ice cap are significantly less than for a nearby ice-free summit, suggesting that an expanded local ice cap shielded the ice-adjacent sites for at least 800 years, longer than the duration of the Little Ice Age. Disequilibrium between 10Be and 26Al concentrations in the same samples can be realistically explained by brief (ca. 10 kyr) intervals of exposure during peak interglacials (MIS 11, 9, 7, 5e, and 1), separated by long (ca. 50–100 kyr) intervals of complete shielding by the LIS. The lack of glacial erosion for at least the past 400 kyr suggests that the LIS was frozen to its bed across much of Baffin Island throughout the Middle and Late Quaternary. Text Arctic Baffin Island Baffin Ice cap Ice Sheet Unknown Arctic Baffin Island Canada |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
Cosmogenic nuclide exposure dating Arctic Baffin Island Glacial history Interglaciation Erosion |
spellingShingle |
Cosmogenic nuclide exposure dating Arctic Baffin Island Glacial history Interglaciation Erosion Gifford H. Millera Jason P. Brinerb Nathaniel A. Liftonc Robert C. Finkeld Limited ice-sheet erosion and complex exposure histories derived from in situ cosmogenic 10Be, 26Al, and 14C on Baffin Island, Arctic Canada |
topic_facet |
Cosmogenic nuclide exposure dating Arctic Baffin Island Glacial history Interglaciation Erosion |
description |
Discordant cosmogenic nuclide exposure ages derived from 10Be, 26Al, and 14C extracted from quartz in rocky summits along the eastern rim of the central Baffin Island plateau provide constraints on the efficiency of erosion by the Laurentide Ice Sheet (LIS) and on the timing and duration of ice-free conditions in the eastern Canadian Arctic. In situ 14C records the duration of exposure during the present interglaciation; any previously acquired 14C decayed below detection limits beneath thick LIS during the last glaciation. The in situ 14C exposure ages for two samples adjacent to a cold-based local ice cap are significantly less than for a nearby ice-free summit, suggesting that an expanded local ice cap shielded the ice-adjacent sites for at least 800 years, longer than the duration of the Little Ice Age. Disequilibrium between 10Be and 26Al concentrations in the same samples can be realistically explained by brief (ca. 10 kyr) intervals of exposure during peak interglacials (MIS 11, 9, 7, 5e, and 1), separated by long (ca. 50–100 kyr) intervals of complete shielding by the LIS. The lack of glacial erosion for at least the past 400 kyr suggests that the LIS was frozen to its bed across much of Baffin Island throughout the Middle and Late Quaternary. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Gifford H. Millera Jason P. Brinerb Nathaniel A. Liftonc Robert C. Finkeld |
author_facet |
Gifford H. Millera Jason P. Brinerb Nathaniel A. Liftonc Robert C. Finkeld |
author_sort |
Gifford H. Millera |
title |
Limited ice-sheet erosion and complex exposure histories derived from in situ cosmogenic 10Be, 26Al, and 14C on Baffin Island, Arctic Canada |
title_short |
Limited ice-sheet erosion and complex exposure histories derived from in situ cosmogenic 10Be, 26Al, and 14C on Baffin Island, Arctic Canada |
title_full |
Limited ice-sheet erosion and complex exposure histories derived from in situ cosmogenic 10Be, 26Al, and 14C on Baffin Island, Arctic Canada |
title_fullStr |
Limited ice-sheet erosion and complex exposure histories derived from in situ cosmogenic 10Be, 26Al, and 14C on Baffin Island, Arctic Canada |
title_full_unstemmed |
Limited ice-sheet erosion and complex exposure histories derived from in situ cosmogenic 10Be, 26Al, and 14C on Baffin Island, Arctic Canada |
title_sort |
limited ice-sheet erosion and complex exposure histories derived from in situ cosmogenic 10be, 26al, and 14c on baffin island, arctic canada |
publishDate |
2006 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.552 http://www.glyfac.buffalo.edu/Faculty/briner/buf/pubs/Miller_et_al_2006.pdf |
geographic |
Arctic Baffin Island Canada |
geographic_facet |
Arctic Baffin Island Canada |
genre |
Arctic Baffin Island Baffin Ice cap Ice Sheet |
genre_facet |
Arctic Baffin Island Baffin Ice cap Ice Sheet |
op_source |
http://www.glyfac.buffalo.edu/Faculty/briner/buf/pubs/Miller_et_al_2006.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.552 http://www.glyfac.buffalo.edu/Faculty/briner/buf/pubs/Miller_et_al_2006.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766325200744349696 |