Pre- Basin and Range Magmetism Jody Becker Kelsii Dana (Team Awesome)

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Presentation transcript:

Pre- Basin and Range Magmetism Jody Becker Kelsii Dana (Team Awesome)

Background Geologic record in the High Lava Plains: 1)>19 Ma- intermediate composition volcanism 2)19-17 Ma- magmatic hiatus 3)17-14 Ma- bimodal volcanism; Steens, N NV Rift, and CRB basalts, NW B&R rhyolitic activity 4)13-11 Ma- volcanism focused to High Lava Plains, W Owyhee Plateau 5)<10 Ma- High Lava Plains/NW B&R basalt and age-progressive rhyolite eruptions

Pre-Basin and Range Magmatism Intermediate composition magmatism – Shallow subduction, delamination of slab – Extreme extension, low angle faulting – Magma mixing Ignimbrite – Shallow-slab subduction – Delaminating subducting plate Region potentially affected by Yellowstone hotspot

Coleman Hills 22 Ma Composite Volcano heavily eroded, Miocene dikes, sills, volcaniclastic sed. exposed – Mafic dikes vesicular with glassy margins – Irregular contacts between sills and contact breccia – Dunes in lithic tuff containing ash and reworked lithics Rhyolitic deposits in shallow water-filled basin, injected with mafic dikes.

Simplified Geology of Coleman Hills