10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland
We reconstruct the history of the Greenland Ice Sheet margin on the Nuussuaq Peninsula in central West Greenland through the Holocene using lake sediment analysis and cosmogenic 10Be exposure dating of the prominent Drygalski Moraines. Erratics perched on bedrock outboard of the Drygalski Moraines c...
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Online Access: | https://escholarship.org/uc/item/3fs4m51t https://escholarship.org/content/qt3fs4m51t/qt3fs4m51t.pdf https://doi.org/10.1016/j.quascirev.2015.08.034 |
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ftcdlib:oai:escholarship.org:ark:/13030/qt3fs4m51t 2024-09-15T18:08:54+00:00 10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland Cronauer, Sandra L Briner, Jason P Kelley, Samuel E Zimmerman, Susan RH Morlighem, Mathieu 2016-09-01 application/pdf https://escholarship.org/uc/item/3fs4m51t https://escholarship.org/content/qt3fs4m51t/qt3fs4m51t.pdf https://doi.org/10.1016/j.quascirev.2015.08.034 unknown eScholarship, University of California qt3fs4m51t https://escholarship.org/uc/item/3fs4m51t https://escholarship.org/content/qt3fs4m51t/qt3fs4m51t.pdf doi:10.1016/j.quascirev.2015.08.034 public Cosmogenic nuclide exposure dating Greenland Ice Sheet Proglacial-threshold lake Holocene Earth Sciences History and Archaeology Paleontology article 2016 ftcdlib https://doi.org/10.1016/j.quascirev.2015.08.034 2024-06-28T06:28:20Z We reconstruct the history of the Greenland Ice Sheet margin on the Nuussuaq Peninsula in central West Greenland through the Holocene using lake sediment analysis and cosmogenic 10Be exposure dating of the prominent Drygalski Moraines. Erratics perched on bedrock outboard of the Drygalski Moraines constrain local deglaciation to ∼9.9±0.6ka (n=2). Three Drygalski Moraine crests yield mean 10Be ages of 8.6±0.4ka (n=2), 8.5±0.2ka (n=3), and 7.6±0.1ka (n=2) from outer to inner. Perched erratics between the inner two moraines average 7.8±0.1ka (n=2) and are consistent with the moraine ages. Sediments from a proglacial lake with a catchment area extending an estimated 2km beneath (inland of) the present ice sheet terminus constrain an ice sheet minimum extent from 5.4ka to 0.6ka. The moraine chronology paired with the lake sediment stratigraphy reveals that the ice margin likely remained within ∼2km of its present position from ∼9.9 to 5.4ka. This unexpected early Holocene stability, preceded by rapid ice retreat and followed by minimum ice extent between ∼5.4 and 0.6ka, contrasts with many records of early Holocene warmth and the Northern Hemisphere summer insolation maximum. We suggest ice margin stability may instead be tied to adjacent ocean temperatures, which reached an optimum in the middle Holocene. Article in Journal/Newspaper Greenland Ice Sheet Nuussuaq University of California: eScholarship Quaternary Science Reviews 147 59 68 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Cosmogenic nuclide exposure dating Greenland Ice Sheet Proglacial-threshold lake Holocene Earth Sciences History and Archaeology Paleontology |
spellingShingle |
Cosmogenic nuclide exposure dating Greenland Ice Sheet Proglacial-threshold lake Holocene Earth Sciences History and Archaeology Paleontology Cronauer, Sandra L Briner, Jason P Kelley, Samuel E Zimmerman, Susan RH Morlighem, Mathieu 10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
topic_facet |
Cosmogenic nuclide exposure dating Greenland Ice Sheet Proglacial-threshold lake Holocene Earth Sciences History and Archaeology Paleontology |
description |
We reconstruct the history of the Greenland Ice Sheet margin on the Nuussuaq Peninsula in central West Greenland through the Holocene using lake sediment analysis and cosmogenic 10Be exposure dating of the prominent Drygalski Moraines. Erratics perched on bedrock outboard of the Drygalski Moraines constrain local deglaciation to ∼9.9±0.6ka (n=2). Three Drygalski Moraine crests yield mean 10Be ages of 8.6±0.4ka (n=2), 8.5±0.2ka (n=3), and 7.6±0.1ka (n=2) from outer to inner. Perched erratics between the inner two moraines average 7.8±0.1ka (n=2) and are consistent with the moraine ages. Sediments from a proglacial lake with a catchment area extending an estimated 2km beneath (inland of) the present ice sheet terminus constrain an ice sheet minimum extent from 5.4ka to 0.6ka. The moraine chronology paired with the lake sediment stratigraphy reveals that the ice margin likely remained within ∼2km of its present position from ∼9.9 to 5.4ka. This unexpected early Holocene stability, preceded by rapid ice retreat and followed by minimum ice extent between ∼5.4 and 0.6ka, contrasts with many records of early Holocene warmth and the Northern Hemisphere summer insolation maximum. We suggest ice margin stability may instead be tied to adjacent ocean temperatures, which reached an optimum in the middle Holocene. |
format |
Article in Journal/Newspaper |
author |
Cronauer, Sandra L Briner, Jason P Kelley, Samuel E Zimmerman, Susan RH Morlighem, Mathieu |
author_facet |
Cronauer, Sandra L Briner, Jason P Kelley, Samuel E Zimmerman, Susan RH Morlighem, Mathieu |
author_sort |
Cronauer, Sandra L |
title |
10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
title_short |
10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
title_full |
10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
title_fullStr |
10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
title_full_unstemmed |
10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
title_sort |
10be dating reveals early-middle holocene age of the drygalski moraines in central west greenland |
publisher |
eScholarship, University of California |
publishDate |
2016 |
url |
https://escholarship.org/uc/item/3fs4m51t https://escholarship.org/content/qt3fs4m51t/qt3fs4m51t.pdf https://doi.org/10.1016/j.quascirev.2015.08.034 |
genre |
Greenland Ice Sheet Nuussuaq |
genre_facet |
Greenland Ice Sheet Nuussuaq |
op_relation |
qt3fs4m51t https://escholarship.org/uc/item/3fs4m51t https://escholarship.org/content/qt3fs4m51t/qt3fs4m51t.pdf doi:10.1016/j.quascirev.2015.08.034 |
op_rights |
public |
op_doi |
https://doi.org/10.1016/j.quascirev.2015.08.034 |
container_title |
Quaternary Science Reviews |
container_volume |
147 |
container_start_page |
59 |
op_container_end_page |
68 |
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1810446276150427648 |