Tholeiitic and alkalic basalts of the Eocene Siletz River Volcanics, Oregon Coast Range

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ID: 293099
1968
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Abstract
These rocks consist of a thick lower unit of tholeiitic basalt and a thin upper unit of alkalic basalt and associated porphyries. Petrochemical studies indicate that older basaltic pillow lavas of the lower unit have the most primitive composition. The abundance of porphyries in the upper unit suggests that crystal fractionation was important in production of the aphyric alkalic rocks, although some volatile transfer may have occurred. Plots of analyzed basalts show similarities to those of the Hawaiian tholeiitic and alkalic suites. The marine volcanic accumulation is typical of flows in the Tertiary eugeosyncline of the Oregon-Washington coast in early to middle Eocene, though the rocks of the upper unit are more localized. The lowermost basalts appear to be typical of basalt from the adjacent Pacific Basin whereas the upper part of the lower unit and the upper unit are similar to Hawaiian basalts.
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Authors P. D. Snavely, N. S. MacLeod, Holly Clyde Wagner
Journal american journal of science
Year 1968
DOI
10.2475/ajs.266.6.454
URL
https://ajs.scholasticahq.com/article/59254.pdf
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