A geochemical study of the Rhododendron and Dalles formations in the area of Mount Hood, Oregon

Author

Marshall W. Gannett, Portland State UniversityFollow

Sponsor

Portland State University. Department of Earth Sciences

First Advisor

Marvin H. Beeson

Date of Publication

1981

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Geology

Department

Earth Science

Language

English

Subjects

Geochemistry -- Oregon -- Mount Hood

DOI

10.15760/etd.3162

Physical Description

1 online resource (72 p.)

Abstract

The Miocene Rhododendron and Dalles Formations in the Mount Hood area are accumulations of chiefly pyroclastic andesitic material, largely confined to the Dalles-Mount Hood syncline. These very similar units are geographically separated by overlying andesites including the present Mount Hood cone, and past workers (Hodge 1938, Wise 1969) have suspected that they may share a common source. Prior to this study, few geochemical data were available for the Rhododendron and the Dalles Formations, compared to the well studied Columbia River basalts underlying them and the overlying Pliocene andesites. This geochemical study was designed to investigate certain aspects of the Rhododendron and Dalles Formations such as their possible common source, how they differ chemically from other andesites in the area, and how they fit into the chemical evolution of the Cascade Mountains.

Rights

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Comments

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Persistent Identifier

http://archives.pdx.edu/ds/psu/18353

Recommended Citation

Gannett, Marshall W., "A geochemical study of the Rhododendron and Dalles formations in the area of Mount Hood, Oregon" (1981). Dissertations and Theses. Paper 3166.
https://doi.org/10.15760/etd.3162