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Timing and extent of Late Pleistocene glaciation in the Chugach Mountains, Alaska

Published online by Cambridge University Press:  08 February 2021

Joshua D. Valentino ,
Lewis A. Owen ,
James A. Spotila ,
Jason M. Cesta  and
Marc W. Caffee
Joshua D. Valentino*
Affiliation:
Terracon, Ashburn, Virginia20147, USA Department of Geosciences, Virginia Tech, Blacksburg, Virginia24061, USA
Lewis A. Owen
Affiliation:
Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina27695, USA
James A. Spotila
Affiliation:
Department of Geosciences, Virginia Tech, Blacksburg, Virginia24061, USA
Jason M. Cesta
Affiliation:
Department of Geology, University of Cincinnati, Cincinnati, Ohio45221, USA
Marc W. Caffee
Affiliation:
Department of Physics, Purdue University, West Lafayette, Indiana47907, USA; Department of Earth, Atmospheric, and Planetary Science, Purdue University, West Lafayette, Indiana47907, USA
*
*Corresponding author at: Department of Geosciences, 4044 Derring Hall, Virginia Tech, 1405 Perry Street, Blacksburg, Virginia24061, USA. E-mail address: [email protected] (J.D. Valentino).
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Abstract

Geomorphic mapping, landform and sediment analysis, and cosmogenic 10Be and 36Cl ages from erratics, moraine boulders, and glacially polished bedrock help define the timing of the Wisconsinan glaciations in the Chugach Mountains of south-central Alaska. The maximum extent of glaciation in the Chugach Mountains during the last glacial period (marine isotope stages [MIS] 5d through 2) occurred at ~50 ka during MIS 3. In the Williwaw Lakes valley and Thompson Pass areas of the Chugach Mountains, moraines date to ~26.7 ± 2.4, 25.4 ± 2.4, 18.8 ± 1.6, 19.3 ± 1.7, and 17.3 ± 1.5 ka, representing times of glacial retreat. These data suggest that glaciers retreated later in the Chugach Mountain than in other regions of Alaska. Reconstructed equilibrium-line altitude depressions range from 400 to 430 m for late Wisconsinan glacial advances in the Chugach Mountains, representing a possible temperature depression of 2.1–2.3°C. These reconstructed temperature depressions suggest that climate was warmer in this part of Alaska than in many other regions throughout Alaska and elsewhere in the world during the global last glacial maximum.

Keywords

AlaskaCosmogenic datingGlaciationChugachPleistoceneEquilibrium-line altitude
Type
Research Article
Information
Quaternary Research , Volume 101 , May 2021 , pp. 205 - 224
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Copyright © University of Washington. Published by Cambridge University Press, 2021

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