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

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 10 Be exposure ages to determine the timing of Late Pleistocene glaciation. In the Nenana River valley, glaciation occurred at 104–180 ka (Lignit...

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Bibliographic Details
Published in:Journal of Quaternary Science
Main Authors: Dortch, Jason M., Owen, Lewis A., Caffee, Marc W., Li, Dewen, Lowell, Thomas V.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2010
Subjects:
Riley
alaska range
Brooks Range
glaciers
Alaska
Online Access:http://dx.doi.org/10.1002/jqs.1406
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.1406
https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.1406
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Summary: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 10 Be 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 10 Be 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. Copyright © 2010 John Wiley & Sons, Ltd.

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