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Electron Microprobe Data for Tephra Attributed to Glacier Peak, Washington1

Published online by Cambridge University Press:  20 January 2017

Henry W. Smith ,
Rose Okazaki  and
Charles R. Knowles
Henry W. Smith
Affiliation:
Washington State University, Pullman, Washington 99164 USA
Rose Okazaki
Affiliation:
Washington State University, Pullman, Washington 99164 USA
Charles R. Knowles
Affiliation:
Idaho Bureau of Mines and Geology, Moscow, Idaho 83843 USA
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Abstract

Reference samples of three prominent pumice units of Glacier Peak tephra collected east of the volcano within a distance of 100 km are similar petrographically to units described by earlier workers. Glass shards isolated from these samples were analyzed by electron microprobe to determine the content of Ca, Fe, and K. Resulting data, plus those published for two other references samples, provide a basis for attributing certain outlying tephra layers from 14 locations in eastern Washington, Idaho, Wyoming, and Montana to eruptions of Glacier Peak. Ten of the samples have properties of both Glacier Peak tephra and Mount St. Helens set J tephra, but proportions of Ca:Fe:K in glass shards indicate that 9 of the 10 outlying samples came from Glacier Peak, whereas one is assigned to Mount St. Helens set J. The remaining six outlying samples, all from southeastern Washington, contain cummingtonite phenocrysts and are chemically similar to some parts of Mount St. Helens tephra sets that are older than 12,000 BP.

Type
Research Article
Information
Quaternary Research , Volume 7 , Issue 2 , March 1977 , pp. 197 - 206
Copyright
University of Washington

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Footnotes

1

Scientific Paper No. 4549. College of Agriculture Research Center, Washington State University, Pullman, Washington, Project 0193.

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