A stratigraphic-geochemical study of the Troutdale Formation and Sandy River Mudstone in the Portland basin and lower Columbia River Gorge

Author

Rodney Duane Swanson, Portland State University

Sponsor

Portland State University. Department of Geology

First Advisor

Marvin H. Beeson

Date of Publication

1986

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Geology

Department

Geology

Language

English

Subjects

Geology -- Oregon -- Troutdale Formation, Geology -- Oregon -- Sandy River Mudston, Stratigraphic geology, Geochemistry -- Oregon -- Troutdale Formation, Geochemistry -- Oregon -- Sandy River Mudstone

DOI

10.15760/etd.5604

Physical Description

1 online resource (115 p.)

Abstract

Hyaloclastic sediment forms an identifiable stratigraphic interval within the Troutdale Formation that can be traced from the Bridal Veil channel to the Portland basin. Hyaloclastic sediment composed chiefly vitric sands is found interbedded with muds, sandy muds and gravels penetrated by wells in northeast Portland are correlated with the upper member of the Troutdale Formation. These beds are characteristic of the informal upper member of the Troutdale Formation in the Bridal Veil channel of the ancestral Columbia River (Tolan and Beeson, 1984) and the type area of the Troutdale Formation exposed along the Sandy River (Trimble, 1963). Fluvially deposited hyaloclastic beds within the upper Troutdale Formation are interpreted to be the result of interaction of Cascadian basaltic lavas with an ancestral Columbia River (Tolan and Beeson, 1984; Trimble, 1963). Glass clasts taken from well and outcrop samples have nearly identical trace and minor element geochemical content as determined by instrumental neutron activation analysis.

Rights

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Comments

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Persistent Identifier

http://archives.pdx.edu/ds/psu/20965

Recommended Citation

Swanson, Rodney Duane, "A stratigraphic-geochemical study of the Troutdale Formation and Sandy River Mudstone in the Portland basin and lower Columbia River Gorge" (1986). Dissertations and Theses. Paper 3720.
https://doi.org/10.15760/etd.5604