First Advisor

Michael L. Cummings

Date of Publication

1987

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Geology

Department

Geology

Language

English

Subjects

Geology -- Oregon -- Glass Buttes Region, Stratigraphic geology, Geochemistry -- Oregon -- Glass Buttes Region, Petrology -- Oregon -- Glass Buttes Region

DOI

10.15760/etd.5632

Physical Description

1 online resource (112 p.)

Abstract

Glass Buttes complex lies at the northern margin of the Basin and Range province in central Oregon and is cut by the northwest-trending Brothers fault zone. An older acrystalline volcanic sequence of high-silica rhyolites (>75% SiO2) forms a broad platform composed of domes and flows with minor pyroclastic deposits. The high-silica rhyolite sequence is divided on the basis of texture into 1) zoned flows and domes, 2) obsidian flows, 3) felsite flows, and 4) biotite-phyric flows and domes.

Rights

In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

Comments

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Persistent Identifier

http://archives.pdx.edu/ds/psu/21147

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