Active Tectonics Basin and Range p. 438-441. Geophysical Data 1 gal = (1 cm/s²)

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Presentation transcript:

Active Tectonics Basin and Range p

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 Ma Flood Basalt increasing focus Age progressive Silicics Younger than 12 Ma rhyolites with > 72 % SiO2

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

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?