Sponsor
Portland State University. Department of Geology
First Advisor
Marvin H. Beeson
Date of Publication
1990
Document Type
Thesis
Degree Name
Master of Science (M.S.) in Geology
Department
Geology
Language
English
Subjects
Stratigraphic geology, Geology -- Oregon -- Keasey Formation, Geology -- Oregon -- Cowlitz Formation, Gas wells -- Oregon
DOI
10.15760/etd.6198
Physical Description
1 online resource (109 p.)
Abstract
Lithological, geophysical, paleontological and geochemical methods were used in order to define the contact relationship between the Keasey and the Cowlitz formations in northwestern Oregon. Drill cuttings from six wells located in Columbia County were analyzed by the Instrumental Neutron Activation Analysis (INAA) method. The concentrations of K, Th, Rb and Sc/Co ratio in the samples established four different groups: 1) High K, Rb, and TH, with low Sc/Co ratio typical of Cowlitz sediments. 2) Low K, Th and Rb and high Sc/Co ratio, more characteristics of the Keasey Formation. 3) Very low concentrations of Rb and high Sc, which is indicative of basaltic volcanism. 4) vertically varying K, Th and Rb concentrations. The provenance of group four is uncertain, but it may represent reworked sediments or the interfingering of the Keasey and the Cowlitz formations. Plots of these elements vs. depth define the geochemical contacts between the formations.
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/25221
Recommended Citation
Lira, Olga Berenice, "Subsurface and geochemical stratigraphy of northwestern Oregon" (1990). Dissertations and Theses. Paper 4314.
https://doi.org/10.15760/etd.6198
Comments
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