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Geochemical and Petrological Characterization of Ash Samples from Cascade Range Volcanoes

Published online by Cambridge University Press:  20 January 2017

Keith Randle ,
Gordon G. Goles  and
Laurence R. Kittleman
Keith Randle
Affiliation:
Center for Volcanology, University of Oregon, Eugene, Oregon. Now at Scottish Research Reactor Centre, Glasgow, Scotland
Gordon G. Goles
Affiliation:
Center for Volcanology, University of Oregon, Eugene, Oregon
Laurence R. Kittleman
Affiliation:
Museum of Natural History, University of Oregon, Eugene, Oregon
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Abstract

Twenty-nine samples of volcanic ash from the Pacific Northwest were analyzed by instrumental neutron activation techniques, with the aim of distinguishing among ashes from different sources. Preliminary results of petrographic studies of 42 ash or pumice samples are also reported. Geochemical characteristics of Mazama ash are defined, and problems induced by winnowing of crystalline material during transport and by weathering are discussed. Contents of La, Th, and Co, and La/Yb ratios are shown to be good discriminants. Data on refractive indices and on proportions of crystalline materials also aid in distinguishing among the various volcanic ashes studied. Ash and pumice found in archaeological contexts at Fort Rock Cave, Paisley Cave, Wildcat Canyon, and Hobo Cave are all from Mount Mazama, presumably from the culminating cruption of 7000 years ago.

Type
Original Articles
Information
Quaternary Research , Volume 1 , Issue 2 , April 1971 , pp. 261 - 282
Copyright
University of Washington

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