Portland State University. Department of Geology
Marvin H. Beeson
Date of Award
Master of Science (M.S.) in Geology
1 online resource (102 p.)
Geochemistry -- Columbia River Gorge (Or. and Wash.), Geology -- Columbia River Gorge (Or. and Wash.), Eagle Creek Formation (Or.)
The Early Miocene Eagle Creek Formation, a series of volcanic mudflows and debris flows, is exposed in the Columbia River Gorge about 64 kilometers east of Portland, Oregon. Eighty-seven samples were analyzed using instrumental neutron activation analysis for trace element concentrations. Eleven samples were analyzed by Dr. Peter Hooper at Washington State University using X-ray Fluorescence for major element chemistry. These data were used to determine that the Eagle Creek Formation compositionally ranges from andesite to dacite.
Carlin, Rachel Ann, "A geochemical study of the Eagle Creek Formation in the Columbia River Gorge, Oregon" (1988). Dissertations and Theses. Paper 3749.