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A Reassessment of U-Th and14C Ages for Late-Glacial High-Frequency Hydrological Events at Searles Lake, California

Published online by Cambridge University Press:  20 January 2017

Jo C. Lin ,
Wallace S. Broecker ,
Sidney R. Hemming ,
Irena Hajdas ,
Robert F. Anderson ,
George I. Smith ,
Maxwell Kelley  and
Georges Bonani
Jo C. Lin
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, 10964
Wallace S. Broecker
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, 10964
Sidney R. Hemming
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, 10964
Irena Hajdas
Affiliation:
Institut für Teilchenphysik, ETH Honggerberg, 8093, Zurich, Switzerland
Robert F. Anderson
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, 10964
George I. Smith
Affiliation:
United States Geological Survey, Menlo Park, California, 94025
Maxwell Kelley
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, 10964
Georges Bonani
Affiliation:
Institut für Teilchenphysik, ETH Honggerberg, 8093, Zurich, Switzerland
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Abstract

U-Th isochron ages of tufas formed on shorelines suggest that the last pluvial event in Lake Lahontan and Searles Lake was synchronous at about 16,500 cal yr B.P. (equivalent to a radiocarbon age of between 14,000 and 13,500 yr B.P.), whereas the timing of this pluvial event determined by radiocarbon dating is on the order of 1000 yr younger. The timing of seven distinct periods of near desiccation in Searles Lake during late-glacial time has been reinvestigated for U-Th age determination by mass spectrometry. U-Th dating of evaporite layers in the interbedded mud and salt unit called the Lower Salt in Searles Lake was hampered by the uncertainty in assessing the initial 230Th/232Th of the samples. The resulting ages, corrected by a conservative range of initial 230Th/232Th ratios, suggest close correlation of the abrupt changes recorded in Greenland ice cores (Dansgaard-Oeschger events) and wet–dry conditions in Searles Lake between 35,000 and 24,000 cal yr B.P.

Keywords

radiocarbon datingU-Th datingGreat Basinwestern USpluvial lakeshydrological balancelate Pleistocene abrupt climate changesjet stream westerlies
Type
Research Article
Information
Quaternary Research , Volume 49 , Issue 1 , January 1998 , pp. 11 - 23
Copyright
University of Washington

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