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Active Tectonics Basin and Range p. 438-441

Active Tectonics Basin and Range p. 438-441. Geophysical Data. 1 gal = (1 cm/s²). Geochemical Data. Active Tectonics. Spatio -temporal progression. 50 and 20 Ma Ignimbrite sweep HLP Geomorphic 17 and 15 Ma Flood Basalt widespread 700 km suture 7.5-8 Ma Flood Basalt

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Active Tectonics Basin and Range p. 438-441

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  1. Active Tectonics Basin and Range p. 438-441

  2. Geophysical Data 1 gal = (1 cm/s²)

  3. Geochemical Data

  4. Active Tectonics

  5. Spatio-temporal progression • 50 and 20 Ma Ignimbrite sweep • HLP Geomorphic • 17 and 15 Ma Flood Basalt • widespread • 700 km suture • 7.5-8 Ma Flood Basalt • increasing focus • Age progressive Silicics • Younger than 12 Ma rhyolites • with > 72 % SiO2

  6. Cascade and HLP isotopic similarities low K-tholeiites Fe Rich Rhyolites End at Newberry Quaternary mafic 35-42 km crust Rattlesnake Tuff

  7. Ash-Flow Tuffs hundreds kmc 9.7 Ma Devine Canyon 195 kmc 8.4 Ma Prater Creek 7.05 Ma Rattlesnake 2x Devine? 7 to 8 Ma W. Harney Basin Dome Complexes Basaltic pulse initiated?

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