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Geologic Setting of the High Lava Plains

Explore the unique geologic features of the High Lava Plains in eastern Oregon, including its diverse crust composition, regional volcanism history with bimodal deposits, and links to the Cascade Range. Discover the tectonic boundaries and volcanic tracks shaping this fascinating landscape.

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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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