Portland State University. Department of Geology
Marvin H. Beeson
Date of Award
Master of Science (M.S.) in Geology
1 online resource (115 p.)
Geology -- Oregon -- Troutdale Formation, Geology -- Oregon -- Sandy River Mudston, Stratigraphic geology, Geochemistry -- Oregon -- Troutdale Formation, Geochemistry -- Oregon -- Sandy River Mudstone
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.
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.