10 Be ages of late Pleistocene deglaciation and Neoglaciation in the north‐central Brooks Range, Arctic Alaska
Abstract We present a chronology of late Pleistocene deglaciation and Neoglaciation for two valleys in the north‐central Brooks Range, Alaska, using cosmogenic 10 Be exposure dating. The two valleys show evidence of ice retreat from the northern range front before ∼16–15 ka, and into individual cirq...
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crwiley:10.1002/jqs.2596 2024-06-23T07:50:29+00:00 10 Be ages of late Pleistocene deglaciation and Neoglaciation in the north‐central Brooks Range, Arctic Alaska Badding, Michael E. Briner, Jason P. Kaufman, Darrell S. 2012 http://dx.doi.org/10.1002/jqs.2596 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2596 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2596 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 28, issue 1, page 95-102 ISSN 0267-8179 1099-1417 journal-article 2012 crwiley https://doi.org/10.1002/jqs.2596 2024-06-11T04:35:37Z Abstract We present a chronology of late Pleistocene deglaciation and Neoglaciation for two valleys in the north‐central Brooks Range, Alaska, using cosmogenic 10 Be exposure dating. The two valleys show evidence of ice retreat from the northern range front before ∼16–15 ka, and into individual cirques by ∼14 ka. There is no evidence for a standstill or re‐advance during the Lateglacial period, indicating that a glacier advance during the Younger Dryas, if any, was less extensive than during the Neoglaciation. The maximum glacier expansion during the Neoglacial is delimited by moraines in two cirques separated by about 200 km and dated to 4.6 ± 0.5 and 2.7 ± 0.2 cal ka BP. Both moraine ages agree with previously published lichen‐inferred ages, and confirm that glaciers in the Brooks Range experienced multiple advances of similar magnitude throughout the late Holocene. The similar extent of glaciers during the middle Holocene and the Little Ice Age may imply that the effect of decreasing summer insolation was surpassed by increasing aridity to limit glacier growth as Neoglaciation progressed. Copyright © 2012 John Wiley & Sons, Ltd. Article in Journal/Newspaper Arctic Brooks Range glacier glaciers Alaska Wiley Online Library Arctic Journal of Quaternary Science 28 1 95 102 |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract We present a chronology of late Pleistocene deglaciation and Neoglaciation for two valleys in the north‐central Brooks Range, Alaska, using cosmogenic 10 Be exposure dating. The two valleys show evidence of ice retreat from the northern range front before ∼16–15 ka, and into individual cirques by ∼14 ka. There is no evidence for a standstill or re‐advance during the Lateglacial period, indicating that a glacier advance during the Younger Dryas, if any, was less extensive than during the Neoglaciation. The maximum glacier expansion during the Neoglacial is delimited by moraines in two cirques separated by about 200 km and dated to 4.6 ± 0.5 and 2.7 ± 0.2 cal ka BP. Both moraine ages agree with previously published lichen‐inferred ages, and confirm that glaciers in the Brooks Range experienced multiple advances of similar magnitude throughout the late Holocene. The similar extent of glaciers during the middle Holocene and the Little Ice Age may imply that the effect of decreasing summer insolation was surpassed by increasing aridity to limit glacier growth as Neoglaciation progressed. Copyright © 2012 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Badding, Michael E. Briner, Jason P. Kaufman, Darrell S. |
spellingShingle |
Badding, Michael E. Briner, Jason P. Kaufman, Darrell S. 10 Be ages of late Pleistocene deglaciation and Neoglaciation in the north‐central Brooks Range, Arctic Alaska |
author_facet |
Badding, Michael E. Briner, Jason P. Kaufman, Darrell S. |
author_sort |
Badding, Michael E. |
title |
10 Be ages of late Pleistocene deglaciation and Neoglaciation in the north‐central Brooks Range, Arctic Alaska |
title_short |
10 Be ages of late Pleistocene deglaciation and Neoglaciation in the north‐central Brooks Range, Arctic Alaska |
title_full |
10 Be ages of late Pleistocene deglaciation and Neoglaciation in the north‐central Brooks Range, Arctic Alaska |
title_fullStr |
10 Be ages of late Pleistocene deglaciation and Neoglaciation in the north‐central Brooks Range, Arctic Alaska |
title_full_unstemmed |
10 Be ages of late Pleistocene deglaciation and Neoglaciation in the north‐central Brooks Range, Arctic Alaska |
title_sort |
10 be ages of late pleistocene deglaciation and neoglaciation in the north‐central brooks range, arctic alaska |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1002/jqs.2596 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2596 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2596 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Brooks Range glacier glaciers Alaska |
genre_facet |
Arctic Brooks Range glacier glaciers Alaska |
op_source |
Journal of Quaternary Science volume 28, issue 1, page 95-102 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.2596 |
container_title |
Journal of Quaternary Science |
container_volume |
28 |
container_issue |
1 |
container_start_page |
95 |
op_container_end_page |
102 |
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1802641387858952192 |