The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today
The multi-million year history of the Greenland Ice Sheet remains poorly known. Ice-proximal glacial marine diamict provides a direct but discontinuous record of ice sheet behavior; it is underutilized as a climate archive. In this paper, we present a novel multiproxy analysis of an Early Pleistocen...
Published in: | Geophysical Research Letters |
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Online Access: | http://www.osti.gov/servlets/purl/1608526 https://www.osti.gov/biblio/1608526 https://doi.org/10.1029/2019GL085176 |
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ftosti:oai:osti.gov:1608526 2023-07-30T04:03:41+02:00 The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today Christ, Andrew J. Bierman, Paul R. Knutz, Paul C. Corbett, Lee B. Fosdick, Julie C. Thomas, Elizabeth K. Cowling, Owen C. Hidy, Alan J. Caffee, Marc W. 2022-04-01 application/pdf http://www.osti.gov/servlets/purl/1608526 https://www.osti.gov/biblio/1608526 https://doi.org/10.1029/2019GL085176 unknown http://www.osti.gov/servlets/purl/1608526 https://www.osti.gov/biblio/1608526 https://doi.org/10.1029/2019GL085176 doi:10.1029/2019GL085176 58 GEOSCIENCES 2022 ftosti https://doi.org/10.1029/2019GL085176 2023-07-11T09:41:01Z The multi-million year history of the Greenland Ice Sheet remains poorly known. Ice-proximal glacial marine diamict provides a direct but discontinuous record of ice sheet behavior; it is underutilized as a climate archive. In this paper, we present a novel multiproxy analysis of an Early Pleistocene marine diamict from northwestern Greenland. Low cosmogenic nuclide concentrations indicate minimal near-surface exposure, similar to modern terrestrial sediment. Detrital apatite (U-Th-Sm)/He (AHe) ages all predate glaciation by >150 million years, suggesting the northwestern Greenland Ice Sheet had, by 1.9 Ma, not yet incised fjords of sufficient depth to excavate grains with young AHe ages. The diamict contains terrestrial plant leaf wax, likely from land surfaces surrounding the ice sheet. These data indicate that a persistent, dynamic ice sheet existed in northwestern Greenland by 1.9 Ma and that diamict is a useful archive of ice sheet history and process. Other/Unknown Material Greenland Ice Sheet SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Greenland Geophysical Research Letters 47 1 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
unknown |
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58 GEOSCIENCES |
spellingShingle |
58 GEOSCIENCES Christ, Andrew J. Bierman, Paul R. Knutz, Paul C. Corbett, Lee B. Fosdick, Julie C. Thomas, Elizabeth K. Cowling, Owen C. Hidy, Alan J. Caffee, Marc W. The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
topic_facet |
58 GEOSCIENCES |
description |
The multi-million year history of the Greenland Ice Sheet remains poorly known. Ice-proximal glacial marine diamict provides a direct but discontinuous record of ice sheet behavior; it is underutilized as a climate archive. In this paper, we present a novel multiproxy analysis of an Early Pleistocene marine diamict from northwestern Greenland. Low cosmogenic nuclide concentrations indicate minimal near-surface exposure, similar to modern terrestrial sediment. Detrital apatite (U-Th-Sm)/He (AHe) ages all predate glaciation by >150 million years, suggesting the northwestern Greenland Ice Sheet had, by 1.9 Ma, not yet incised fjords of sufficient depth to excavate grains with young AHe ages. The diamict contains terrestrial plant leaf wax, likely from land surfaces surrounding the ice sheet. These data indicate that a persistent, dynamic ice sheet existed in northwestern Greenland by 1.9 Ma and that diamict is a useful archive of ice sheet history and process. |
author |
Christ, Andrew J. Bierman, Paul R. Knutz, Paul C. Corbett, Lee B. Fosdick, Julie C. Thomas, Elizabeth K. Cowling, Owen C. Hidy, Alan J. Caffee, Marc W. |
author_facet |
Christ, Andrew J. Bierman, Paul R. Knutz, Paul C. Corbett, Lee B. Fosdick, Julie C. Thomas, Elizabeth K. Cowling, Owen C. Hidy, Alan J. Caffee, Marc W. |
author_sort |
Christ, Andrew J. |
title |
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
title_short |
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
title_full |
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
title_fullStr |
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
title_full_unstemmed |
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today |
title_sort |
northwestern greenland ice sheet during the early pleistocene was similar to today |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1608526 https://www.osti.gov/biblio/1608526 https://doi.org/10.1029/2019GL085176 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
http://www.osti.gov/servlets/purl/1608526 https://www.osti.gov/biblio/1608526 https://doi.org/10.1029/2019GL085176 doi:10.1029/2019GL085176 |
op_doi |
https://doi.org/10.1029/2019GL085176 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
1 |
_version_ |
1772814735732899840 |