The Ore bin ; Vol. 34 No. 8 (August 1972) Public Deposited

http://ir.library.oregonstate.edu/concern/administrative_report_or_publications/5138jk725

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  • The plate tectonic history of Oregon is but one piece of a worldwide jigsaw puzzle encompassing much of geologic time. With the splitting of Pangaea in Mesozoic times, Oregon has occupied the leading edge of the North American Plate as it has impinged upon the ancestral oceanic East Pacific Plate. In the process Oregon has undergone profound subduction type tectonism. In addition, it may have acquired much lithospheric material from other plates, possibly some of the Paleozoic rocks of the Klamaths from Asia, ultramafic rocks and volcanic rocks from the Triassic oceanic crust, and the Siletz River Volcanics from the Eocene deep-sea floor. In middle Tertiary times, Oregon, along with the rest of western North America, actually caught up with the East Pacific Rise, an event which profoundly altered the pattern of tectonic behavior within the state. Flood basalts and block faulting replaced andesitic volcanism and thrust faulting as the dominant mode of tectonism. The pattern of deformation in late Tertiary times is extremely complex and a plate tectonic model consistent with all the data has yet to be formulated.
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  • Paleozoic tectonics -- Triassic-Jurassic subduction -- Cretaceous folding and thrusting -- Eocene rifting -- Oligocene subduction -- Miocene rifting -- Conclusions -- Bibliography.
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  • Reports and Publications -- Other Reports and Publications
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