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
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).
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
Sample locations in the Mt. Hood area
figure1part2.pdf (2299 kB)
Sample locations in The Dalles area
Comments
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This thesis includes supplemental content available to download.