Late Quaternary deglaciation of Prince William Sound, Alaska

Peter J. Haeussler*, Ari Matmon, Maurice Arnold, Georges Aumaître, Didier Bourlès, Karim Keddadouche

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

To understand the timing of deglaciation of the northernmost marine-terminating glaciers of the Cordilleran Ice Sheet (CIS), we obtained 26 10Be surface-exposure ages from glacially scoured bedrock surfaces in Prince William Sound (PWS), Alaska. We sampled six elevation transects between sea level and 620 m and spanning a distance of 14 to 70 km along ice flow paths. Most transect age–elevation patterns could not be explained by a simple model of thinning ice; the patterns provide evidence for lingering ice cover and possible inheritance. A reliable set of 20 ages ranges between 17.4 ± 2.0 and 11.6 ± 2.8 ka and indicates ice receded from northwestern PWS around 14.3 ± 1.6 ka, thinned at a rate of ~120–160 m/ka, and retreated from sea-level sites at 12.9 ± 1.1 ka at a rate of 20 m/yr. The retreat rate likely slowed as glaciers retreated into northern PWS. These results are consistent with the growing body of reported deglacial constraints on collapse of ice sheets along the Alaska margin indicating collapse of the CIS soon after 17 ka. These data are consistent with paleotemperature data indicating that a warming North Pacific Ocean caused catastrophic collapse of this part of the CIS.

Original languageAmerican English
Pages (from-to)115-134
Number of pages20
JournalQuaternary Research
Volume105
DOIs
StatePublished - 21 Jan 2022

Bibliographical note

Publisher Copyright:
Copyright © University of Washington. Published by Cambridge University Press, 2021

Keywords

  • Alaska
  • Be exposure ages
  • Cordilleran Ice Sheet
  • Deglaciation
  • Prince William Sound
  • Retreat rate
  • Thinning rate

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