K-Ar dating, Quaternary and Neogene volcanic rocks of the Snake River Plain, Idaho

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ID: 292613
1975
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Abstract
Ninety-eight K-Ar dates for lavas of the Snake River Plain (SRP) and vicinity provide calibration for the stratigraphic framework discussed by Malde and Powers (1962). The Idavada Volcanics, predominantly silicic volcanic rocks, are 9 to 13 m.y. old in the western SRP. Rocks of similar type and comparable stratigraphic position are 8 to 10 m.y. old in the central SRP and as young as 4 to 5 m.y. old in the eastern SRP. This time-transgressive silicic volcanic assemblage merges in the east with the silicic volcanic units erupted during the last 2 m.y. from Island Park, Yellowstone, and related volcanic centers. The Idaho Group, consisting of intercalated basalt flows and sedimentary deposits in the western half of the SRP, ranges in age from about 0.6 to 11.5 m.y. (71 refs.)
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Authors R. L. Armstrong, William P. Leeman, Harold E. Malde
Journal american journal of science
Year 1975
DOI
10.2475/ajs.275.3.225
URL
https://ajs.scholasticahq.com/article/59757.pdf
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