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Amino Acid Age Estimates, Quaternary Atlantic Coastal Plain: Comparison with U-series Dates, Biostratigraphy, and Paleomagnetic Control

Published online by Cambridge University Press:  20 January 2017

J. F. Wehmiller  and
D. F. Belknap
J. F. Wehmiller
Affiliation:
Department of Geology, University of Delaware, Newark, Delaware 19711
D. F. Belknap
Affiliation:
Department of Geology, University of Delaware, Newark, Delaware 19711 Department of Marine Science, University of South Florida, 830 First St. South, St. Petersburg, Florida 33701
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Abstract

Amino acid enantiomeric (D/L) ratios in the mollusk Mercenaria are compared with recently published biostratigraphic and/or U-series solitary coral data from 22 Quaternary localities on the central and southern Atlantic Coastal Plain. In all cases, local relative aminostratigraphic sequences are consistent with relative ages inferred from U-series or biostratigraphic data, although occasionally more depositional events are recognized by aminostratigraphic than biostratigraphic methods. However, if the U-series data are used as age calibrations for the D/L values, latitudinal trends of “isochronous” D/L values are highly variable and conflict with trends expected from the present temperature gradient, which is smooth and nearly linear between 45° and 25° N. Age estimation can be performed independently of the U-series data using a kinetic model that relies on the assumption that Pleistocene temperature gradients have also been smooth functions of latitude, although significantly steeper than the present temperature gradient. Within the uncertainties of this assumption, kinetic model age estimates for localities in the coastal plain fall into the following groups: 70,000–130,000 yr, 200–250,000 yr, 300,000–400,000 yr, 500,000–600,000 yr, 700,000–800,000 yr, and > 1,000,000 yr. Major conflicts between these model age estimates are observed for localities near Charleston, South Carolina and in central Virginia. These conflicts could indicate that the basic temperature assumptions of aminostratigraphy are incorrect, and that apparent local aminostratigraphic sequences (clusters of different D/L values) could be due to factors other than age difference. Alternatively, some of the U-series dates may be only minimum ages for these localities.

Type
Research Article
Information
Quaternary Research , Volume 18 , Issue 3 , November 1982 , pp. 311 - 336
Copyright
University of Washington

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