Active Tectonics Basin and Range p. 438-441. Geophysical Data 1 gal = (1 cm/s²)
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ive Tectonics Basin and Range p. 438-4
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Transcript of Active Tectonics Basin and Range p. 438-441. Geophysical Data 1 gal = (1 cm/s²)
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Active Tectonics Basin and Range p. 438-441
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Geophysical Data
1 gal =
(1 cm/s²)
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Geochemical Data
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Active Tectonics
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Spatio-temporal progression
50 and 20 Ma Ignimbrite sweep
HLP Geomorphic
17 and 15 Ma Flood Basalt widespread700 km suture
7.5-8 Ma Flood Basalt increasing focus
Age progressive SilicicsYounger than 12 Ma rhyolites with > 72 % SiO2
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Cascade and HLP isotopic similarities
low K-tholeiitesFe Rich Rhyolites End at NewberryQuaternary mafic35-42 km crust
Rattlesnake Tuff
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Ash-Flow Tuffs hundreds kmc 9.7 Ma Devine Canyon 195 kmc8.4 Ma Prater Creek 7.05 Ma Rattlesnake2x Devine?
7 to 8 Ma W. Harney BasinDome Complexes
Basaltic pulse initiated?