Portland State University. Department of Geology
Marvin H. Beeson
Date of Publication
Master of Science (M.S.) in Geology
Geochemistry -- Columbia River Gorge (Or. and Wash.), Geology -- Columbia River Gorge (Or. and Wash.), Eagle Creek Formation (Or.)
1 online resource (102 p.)
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.
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Carlin, Rachel Ann, "A geochemical study of the Eagle Creek Formation in the Columbia River Gorge, Oregon" (1988). Dissertations and Theses. Paper 3749.