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

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

We present a chronology of late Pleistocene deglaciation and Neoglaciation for two valleys in the north-central Brooks Range, Alaska, using cosmogenic 10Be exposure dating. The two valleys show evidence of ice retreat from the northern range front before ∼16-15ka, and into individual cirques by ∼14ka. 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 200km and dated to 4.6±0.5 and 2.7±0.2cal 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.

Original languageEnglish (US)
Pages (from-to)95-102
Number of pages8
JournalJournal of Quaternary Science
Volume28
Issue number1
DOIs
StatePublished - Jan 2013

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Keywords

  • Be dating
  • Alaska
  • Brooks Range
  • Neoglaciation

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology
  • Arts and Humanities (miscellaneous)

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