Beryllium-10 surface exposure dating of glacial successions in the Central Alaska Range

Jason M. Dortch, Lewis A. Owen, Marc W. Caffee, Dewen Li, Thomas V. Lowell

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Glacial landforms and outwash terraces in the Nenana River valley, Reindeer Hills and Monahan Flat in the central Alaska Range were dated with 60 10Be exposure ages to determine the timing of Late Pleistocene glaciation. In the Nenana River valley, glaciation occurred at 104-180-ka (Lignite Creek glaciation), ca. 55-ka (Healy glaciation), and ca. 16-ka (Carlo Creek phase); glaciers retreated in the Reindeer Hills and Monahan Flat by ca. 14-ka and ca. 13-ka, respectively. The Carlo Creek moraine is similar in age to at least six other moraines in the Alaska Range, Ahklun Mountains and Brooks Range. The new data suggest that post-depositional geological processes limit the usefulness of 10Be methods to the latter part (≤60-ka) of the late Quaternary in central Alaska. Ages on Healy and younger landforms cluster well, with the exception of Riley Creek moraines and Monahan Flat-west sites, where boulders were likely affected by post-depositional processes.

Original languageEnglish
Pages (from-to)1259-1269
Number of pages11
JournalJournal of Quaternary Science
Volume25
Issue number8
DOIs
StatePublished - Dec 2010

Keywords

  • Alaska Range
  • Geochronology
  • Glaciation
  • Moraine
  • Surface exposure dating

ASJC Scopus subject areas

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

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