Glacier readvance during the late glacial (Younger Dryas?) in the Ahklun Mountains southwestern Alaska

Jason P. Briner, Darrell S. Kaufman, Al Werner, Marc Caffee, Laura Levy, William F. Manley, Michael R. Kaplan, Robert C. Finkel

Research output: Contribution to journalArticle

54 Scopus citations

Abstract

An expansion of alpine glaciers during the latest Pleistocene produced an extraordinarily well defined end moraine system in the Ahklun Mountains, southwestern Alaska. These moraines, deposited during the Mount Waskey advance, are several kilometers beyond modern glacier termini, and ∼80 km upvalley of the late Wisconsin Ahklun Mountains ice cap terminal moraine. Eleven cosmogenic 10Be and 26Al exposure ages on moraine boulders, combined with radiocarbon ages from a lake core upvalley of a moraine deposited during the Mount Waskey advance, suggest that the advance culminated between 12.4 and 11.0 ka, sometime during, or shortly following, the Younger Dryas event (ca. 12.9-11.6 ka). We believe that the Mount Waskey advance was a consequence of cooling during the Younger Dryas. These data further strengthen emerging evidence for Younger Dryas-age cooling of the North Pacific region.

Original languageEnglish (US)
Pages (from-to)679-682
Number of pages4
JournalGeology
Volume30
Issue number8
DOIs
StatePublished - Aug 1 2002

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Keywords

  • Alaska
  • Cosmogenic exposure dating
  • Glaciers
  • Late glacial
  • Younger Dryas

ASJC Scopus subject areas

  • Geology

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