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Paleomagnetic secular variation and environmental magnetism of Holocene-age sediments from Tulare Lake, CA

Published online by Cambridge University Press:  20 January 2017

Janine Roza ,
Brandon Jackson ,
Eric Heaton  and
Rob Negrini
Janine Roza*
Affiliation:
California State University, Geological Sciences, Bakersfield, CA 93311, USA
Brandon Jackson
Affiliation:
California State University, Geological Sciences, Bakersfield, CA 93311, USA
Eric Heaton
Affiliation:
California State University, Geological Sciences, Bakersfield, CA 93311, USA
Rob Negrini
Affiliation:
California State University, Geological Sciences, Bakersfield, CA 93311, USA
*
⁎Corresponding author. E-mail address:[email protected] (J. Roza).
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Abstract

The lake-level record from Tulare Lake, CA has been shown to provide valuable constraints on late Pleistocene and Holocene runoff from the Sierra Nevada mountain range into the San Joaquin Valley of California, one of the world's most prolific agricultural centers. This project uses the magnetic properties of the Tulare Lake sediments in order to date the sediments and to constrain the relative lake level at the time of deposition. Shallowing lake conditions were identified leading up to a prominent unconformity; magnetic mineralogy and grain size indicators, primarily decreasing ARM/IRM and S-Ratio values suggest coarser grain sizes and more oxidizing conditions. Approximately half of the samples possessed well-behaved paleomagnetic directions suitable for paleomagnetic secular variation dating. The results indicate that the sediments below the unconformity were deposited approximately 7600–8500 cal yr BP, and the sediments above the unconformity were deposited approximately 2500–800 cal yr BP. The ages of the corresponding sediments are consistent with the time intervals during which previous studies indicate that lake level was above the elevation of this site, before and after a mid Holocene regression.

Keywords

PaleomagnetismEnvironmental magnetismHolocene
Type
Original Articles
Information
Quaternary Research , Volume 85 , Issue 3 , May 2016 , pp. 391 - 398
Copyright
University of Washington

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