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Obsidian Hydration Dating of Volcanic Events

Published online by Cambridge University Press:  20 January 2017

Irving Friedman  and
John Obradovich
Irving Friedman
Affiliation:
U.S. Geological Survey, Denver Federal Center MS 963, P.O. Box 25046, Denver, Colorado 80225
John Obradovich
Affiliation:
U.S. Geological Survey, Denver Federal Center MS 963, P.O. Box 25046, Denver, Colorado 80225
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Abstract

Obsidian hydration dating of volcanic events had been compared with ages of the same events determined by the 14C and K — Ar methods at several localities. The localities, ranging in age from 1200 to over 1 million yr, include Newberry Craters, Oregon; Coso Hot Springs, California; Salton Sea, California; Yellowstone National Park, Wyoming; and Mineral Range, Utah. In most cases the agreement is quite good. A number of factors including volcanic glass composition and exposuretemperature history must be known in order to relate hydration thickness to age. The effect of composition can be determined from chemical analysis or the refractive index of the glass. Exposure-temperature history requires a number of considerations enumerated in this paper.

Type
Original Articles
Information
Quaternary Research , Volume 16 , Issue 1 , July 1981 , pp. 37 - 47
Copyright
University of Washington

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