Sponsor
Portland State University. Department of Geology
First Advisor
Michael L. Cummings
Term of Graduation
Spring 1985
Date of Publication
6-13-1985
Document Type
Thesis
Degree Name
Master of Science (M.S.) in Geology
Department
Geology
Language
English
Subjects
Metamorphism (Geology) -- Washington (State) -- Wind River Region, Hydrothermal deposits -- Washington (State) -- Wind River Region, Geochemistry -- Washington (State) -- Wind River Region, Geology -- Washington (State) -- Wind River Region
DOI
10.15760/etd.5469
Physical Description
1 online resource (4, x, 136 pages)
Abstract
The Wind River gold prospect is located in TSN, R7E of Skamania County, Washington, and is an epithermal gold-quartz vein system hosted in volcanic rocks of the Ohanapecosh Formation, a late Eocene to middle Oligocene unit of calcalkaline chemical composition. Andesitic pyroclastic rocks of the Ohanapecosh Formation are the host of mineralization in the study area, and form the lowest of several stratigraphic subunits. These pyroclastic rocks are overlain by two sequences of lava flows which cap the ridges and are folded by an anticlinal warp over the length of Paradise Ridge, plunging gently to the southeast. Toward the west, the number of flows decreases and the proportion of intercalated pyroclastic rocks increases. Numerous dikes cut the pyroclastic rocks at the Wind River prospect. Geochemical data show these dikes to have been feeders for the overlying lava flows. Differing degrees of alteration of the dikes relative to the most intensely altered pyroclastic rocks which they cut indicates a complex history of overlapping hydrothermal and volcanic activity at the prospect.
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
https://archives.pdx.edu/ds/psu/20367
Recommended Citation
McGowan, Krista I., "Geochemistry of Alteration and Mineralization of the Wind River Gold Prospect, Skamania County, Washington" (1985). Dissertations and Theses. Paper 3586.
https://doi.org/10.15760/etd.5469
Plate 1 - Regional Geology of the Wind River Gold Prospect
mcgowanplate2.jpg (9810 kB)
Plate 2 - Map of the Exploratory Roadcut at the Wind River Prospect
mcgowanplate3.jpg (9891 kB)
Plate 3 - Map of the Wind River Prospect Adit
Comments
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