10Be 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 northcentral 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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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1054.6474 2023-05-15T15:04:59+02:00 10Be ages of late Pleistocene deglaciation and Neoglaciation in the north-central Brooks Range, Arctic Alaska Michael E Badding Jason P Briner Darrell S Kaufman The Pennsylvania State University CiteSeerX Archives 2013 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1054.6474 http://www.glyfac.buffalo.edu/Faculty/briner/buf/pubs/Badding_et_al_doi.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1054.6474 http://www.glyfac.buffalo.edu/Faculty/briner/buf/pubs/Badding_et_al_doi.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/Badding_et_al_doi.pdf text 2013 ftciteseerx 2020-04-12T00:20:12Z ABSTRACT: We present a chronology of late Pleistocene deglaciation and Neoglaciation for two valleys in the northcentral 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 AE 0.5 and 2.7 AE 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. Text Arctic Brooks Range glacier glaciers Alaska Unknown Arctic |
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ftciteseerx |
language |
English |
description |
ABSTRACT: We present a chronology of late Pleistocene deglaciation and Neoglaciation for two valleys in the northcentral 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 AE 0.5 and 2.7 AE 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. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Michael E Badding Jason P Briner Darrell S Kaufman |
spellingShingle |
Michael E Badding Jason P Briner Darrell S Kaufman 10Be ages of late Pleistocene deglaciation and Neoglaciation in the north-central Brooks Range, Arctic Alaska |
author_facet |
Michael E Badding Jason P Briner Darrell S Kaufman |
author_sort |
Michael E Badding |
title |
10Be ages of late Pleistocene deglaciation and Neoglaciation in the north-central Brooks Range, Arctic Alaska |
title_short |
10Be ages of late Pleistocene deglaciation and Neoglaciation in the north-central Brooks Range, Arctic Alaska |
title_full |
10Be ages of late Pleistocene deglaciation and Neoglaciation in the north-central Brooks Range, Arctic Alaska |
title_fullStr |
10Be ages of late Pleistocene deglaciation and Neoglaciation in the north-central Brooks Range, Arctic Alaska |
title_full_unstemmed |
10Be ages of late Pleistocene deglaciation and Neoglaciation in the north-central Brooks Range, Arctic Alaska |
title_sort |
10be ages of late pleistocene deglaciation and neoglaciation in the north-central brooks range, arctic alaska |
publishDate |
2013 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1054.6474 http://www.glyfac.buffalo.edu/Faculty/briner/buf/pubs/Badding_et_al_doi.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Brooks Range glacier glaciers Alaska |
genre_facet |
Arctic Brooks Range glacier glaciers Alaska |
op_source |
http://www.glyfac.buffalo.edu/Faculty/briner/buf/pubs/Badding_et_al_doi.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1054.6474 http://www.glyfac.buffalo.edu/Faculty/briner/buf/pubs/Badding_et_al_doi.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766336761712082944 |