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Geologic Setting of the High Lava Plains

Geologic Setting of the High Lava Plains. Kelsii Dana. Overview. High Lava Plains of eastern Oregon bound by: North- Blue Mountains East- Precambrian North America South- Basin and Range West- Cascade Range. The Crust. NE/C OR and W ID: Paleozoic-Mesozoic oceanic volcanic arcs

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Geologic Setting of the High Lava Plains

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  1. Geologic Settingof the High Lava Plains Kelsii Dana

  2. Overview • High Lava Plains of eastern Oregon bound by: • North- Blue Mountains • East- Precambrian North America • South- Basin and Range • West- Cascade Range

  3. The Crust • NE/C OR and W ID: • Paleozoic-Mesozoic oceanic volcanic arcs • Accretionary complexes • Basinal successions • Similar terranes in Klamaths • Crust 30-42 km thick, thickening eastward

  4. Regional Volcanism • Voluminous Cenozoic volcanism: • Ignimbrite sweep • Flood basalts • Bimodal (modern) • Highest bimodal volumes deposited: • High Lava Plains • Snake River Plain

  5. Regional Volcanism • Two migrating tracks: • NE along Snake River Plain toward Yellowstone • WNW along High Lava Plains (ends at Newberry) • Indicated link between High Lava Plains and Cascades volcanism: • Increased volcanic output • Isotopic similarities • Merging structures

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