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Magnetostratigraphy of Plio-Pleistocene Lake Sediments in the Confidence Hills of southern Death Valley, California

Pluhar, Christopher J. and Holt, John W. and Kirschvink, Joseph L. and Beratan, Kathi K. and Adams, Robert W. (1992) Magnetostratigraphy of Plio-Pleistocene Lake Sediments in the Confidence Hills of southern Death Valley, California. In: The Confidence Hills, Southern Death Valley, California : depositional environments, magnetostratigraphy, and Plio-Pleistocene strata : and Abstracts of proceedings 6th annual Mojave Desert Quaternary Research Symposium, San Bernardino County Museum. Quarterly (San Bernardino County Museum Association). Vol.39. No.39:2. San Bernardino County Museum Association , Redlands, CA, pp. 12-19.

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Over 200 meters of continuous playa and lacustrine sediments and volcanic ashes are exposed in the Confidence Hills of southern Death Valley. Oriented samples from two stream canyons which cut through the sediments possess stable characteristic components of Natural Remanent Magnetization (NRM). Progressive demagnetization experiments yield several normal and reversed polarity zones which are stratigraphically distinct, and the characteristic components pass the reversal test. The presence of the Huckleberry Ridge volcanic ash (c.a. 2 Ma) in one of the reversed polarity zones provides a dated stratigraphic marker for correlation of the magnetostratigraphy to the magnetic polarity timescale. The correlation indicates that deposition began before the Reunion magnetic event (2.14-2.15 Ma) in the early Matuyama reversed chron (late Pliocene), and continued through the Olduvai normal subchron (c.a., 1.79 Ma) into the early Pleistocene. Deposition rates for the portion of the formation studied average about 26 cm/ky. Despite the close proximity of the sequence to strands of the Death Valley Fault, no net vertical-axis tectonic rotation could be detected.

Item Type:Book Section
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Kirschvink, Joseph L.0000-0001-9486-6689
Additional Information:© 1992 San Bernardino County Museum Association. Supported by NSF grant EAR-9019289 to JLK and by a California Institute of Technology Summer Undergraduate Research Fellowship (SURF) to CJP.
Funding AgencyGrant Number
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
Series Name:Quarterly (San Bernardino County Museum Association)
Issue or Number:39:2
Record Number:CaltechAUTHORS:20130116-155259484
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Official Citation:Pluhar, C.J., Holt, J.H., Kirschvink,J.L., Beratan K., and R.W. Adams. 1992. Magnetostratigraphy of plio-pleistocene lake sediments in the Confidence Hills of Southern Death Valley, California. San Bernardino County Museum Association Quaterly v. 39(2), p. 12-19.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36435
Deposited By: Tony Diaz
Deposited On:15 Apr 2013 18:35
Last Modified:17 Nov 2022 22:20

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