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 Be-10 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 Be-10 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 (C) 2010 John Wiley & Sons, Ltd.
Published in:
Journal of Quaternary Science 25,8 (2010) 1259-1269;
Link to original published article:
http://dx.doi.org/10.1002/jqs.1406
Date of Version
12-1-2010
Recommended Citation
Dortch, J. M.; Owen, L. A.; Caffee, M. W.; Li, D.; and Lowell, T. V., "Beryllium-10 surface exposure dating of glacial successions in the Central Alaska Range" (2010). Department of Physics and Astronomy Faculty Publications. Paper 1231.
https://docs.lib.purdue.edu/physics_articles/1231