1 / 5

Pre- Basin and Range Magmetism

Pre- Basin and Range Magmetism. Jody Becker Kelsii Dana (Team Awesome). Background. Geologic record in the High Lava Plains: >19 Ma- intermediate composition volcanism 19-17 Ma- magmatic hiatus 17-14 Ma- bimodal volcanism; Steens , N NV Rift, and CRB basalts, NW B&R rhyolitic activity

palma
Download Presentation

Pre- Basin and Range Magmetism

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

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

  3. 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

  4. 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.

  5. Simplified Geology of Coleman Hills

More Related