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

34 Citations (Scopus)

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

Fingerprint

deglaciation
glacier
Pleistocene
Holocene
glacier advance
valley
Neoglacial
ice retreat
Little Ice Age
Younger Dryas
moraine
aridity
insolation
lichen
chronology
brook
Late Pleistocene
Glacier
Arctic
summer

Keywords

  • Be dating
  • Alaska
  • Brooks Range
  • Neoglaciation

ASJC Scopus subject areas

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

Cite this

10Be ages of late Pleistocene deglaciation and Neoglaciation in the north-central Brooks Range, Arctic Alaska. / Badding, Michael E.; Briner, Jason P.; Kaufman, Darrell S.

In: Journal of Quaternary Science, Vol. 28, No. 1, 01.2013, p. 95-102.

Research output: Contribution to journalArticle

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