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

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Presentation on theme: "Active Tectonics Basin and Range p. 438-441. Geophysical Data 1 gal = (1 cm/s²)"— Presentation transcript:

1 Active Tectonics Basin and Range p. 438-441

2 Geophysical Data 1 gal = (1 cm/s²)

3 Geochemical Data

4

5 Active Tectonics

6

7 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

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

9 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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