Advisor

Michael L. Cummings

Date of Award

1987

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Geology

Department

Geology

Physical Description

1 online resource (112 p.)

Subjects

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

DOI

10.15760/etd.5632

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.

Description

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Persistent Identifier

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

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