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Enhanced Age Resolution of the Marine Quaternary Record in the Arctic Using Aspartic Acid Racemization Dating of Bivalve Shells

Published online by Cambridge University Press:  20 January 2017

Glenn A. Goodfriend ,
Julie Brigham-Grette  and
Gifford H. Miller
Glenn A. Goodfriend
Affiliation:
Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W. Washington, DC, 20015-1305
Julie Brigham-Grette
Affiliation:
Department of Geosciences, University of Massachusetts, Amherst, Massachusetts, 01003-0026
Gifford H. Miller
Affiliation:
Institute of Arctic and Alpine Research and Department of Geological Sciences, University of Colorado, Boulder, Colorado, 80309-0450
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Abstract

Aspartic acid (Asp) racemization occurs at a significantly higher rate than isoleucine epimerization and consequently provides better temporal resolution of Arctic marine deposits (from Alaska, Spitsbergen, and Baffin Island). Heating experiments (at 100°C) on the bivalves Mya and Hiatella show the Asp racemization rate decreases with increasing D/L values, as is typical for biogenic carbonates. Based on these experimental racemization rates and rates determined from racemization of samples radiocarbon dated to ca. 10,000–12,000 yr B.P., activation energies for Mya and Hiatella are estimated to be 30.6 and 30.0 kcal/mol, respectively, for Asp racemization, and 29.0 and 29.5 for isoleucine epimerization. Analysis of a time series of Plio–Pleistocene Hiatella from the north coast of Alaska shows that last-interglacial mollusks can be readily distinguished from modern samples by Asp but not by isoleucine. D/L Asp values indicate a younger age for the Fishcreekian transgression than does isoleucine epimerization. For Spitsbergen, D/L Asp shows a slight age difference (ca. 12,000 yr) between two units of the “episode B” interstadial and suggests that the age of these units may be closer to 65,000 than to 80,000 yr B.P., two possible ages suggested by other evidence. The age of the Loks Land Interstadial on Baffin Island is likely to be greater than that indicated by radiocarbon ages. Within deposits from each region, D/L Asp values are less variable among individual shells than isoleucine epimerization values. This may indicate better reliability of Asp for geochronology.

Type
Research Article
Information
Quaternary Research , Volume 45 , Issue 2 , March 1996 , pp. 176 - 187
Copyright
University of Washington

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