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14C Ages of Ostracodes from Pleistocene Lake Sediments of the Western Great Basin, Usa—Results of Progressive Acid Leaching

Published online by Cambridge University Press:  18 July 2016

Irka Hajdas ,
Georges Bonani ,
Susan Herrgesell Zimmerman ,
Millie Mendelson  and
Sidney Hemming
Irka Hajdas*
Affiliation:
PSI, ETH Hönggerberg, 8093 Zürich, Switzerland.
Georges Bonani
Affiliation:
Institut für Teilchenphysik, ETH Hönggerberg, 8093 Zürich, Switzerland.
Susan Herrgesell Zimmerman
Affiliation:
LDEO, Columbia University, New York, USA.
Millie Mendelson
Affiliation:
LDEO, Columbia University, New York, USA.
Sidney Hemming
Affiliation:
LDEO, Columbia University, New York, USA.
*
Corresponding author. Email: [email protected].
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Abstract

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Progressive dissolution experiments were performed on samples of ostracode shells from lacustrine sediments from the western Great Basin to remove contamination of the surface by secondary calcite. The observed age differences between the external and residual fractions were as great as 2000 to 6000 yr. A “plateau” in ages of the last fractions was obtained only for 1 sample; however, results of repeated experiments resulted in very good agreement of the final ages. A comparison with previously published chronologies based on bulk radiocarbon ages of ostracodes from Wilson Creek (Benson et al. 1990) shows that leaching is imperative for dating samples older than 20 ka B P. This study focuses on the problem of contamination and its removal. However, the final chronology of the Wilson Creek Formation (and other late Pleistocene lacustrine sediments) will require additional dating of other sections as well as establishment of a reservoir effect correction.

Type
Articles
Information
Radiocarbon , Volume 46 , Issue 1: Proceedings of the 18th International Radiocarbon Conference (Part 1 of 2), Conference Editors: Nancy Beavan Athfield, Rodger J Sparks , 2004 , pp. 189 - 200
Copyright
Copyright © 2004 by the Arizona Board of Regents on behalf of the University of Arizona 

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