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Geologic Setting of the High Lava Plains Kelsii Dana.

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Presentation on theme: "Geologic Setting of the High Lava Plains Kelsii Dana."— Presentation transcript:

1 Geologic Setting of 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 km thick, thickening eastward

4 Regional Volcanism Voluminous Cenozoic volcanism: 1)Ignimbrite sweep 2)Flood basalts 3)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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