active tectonics basin and range p. 438-441

9
ive Tectonics Basin and Range p. 438-4

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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 - PowerPoint PPT Presentation

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

Active Tectonics Basin and Range p. 438-441

Page 2: Active Tectonics Basin and Range p. 438-441

Geophysical Data

1 gal =

(1 cm/s²)

Page 3: Active Tectonics Basin and Range p. 438-441

Geochemical Data

Page 4: Active Tectonics Basin and Range p. 438-441
Page 5: Active Tectonics Basin and Range p. 438-441

Active Tectonics

Page 6: Active Tectonics Basin and Range p. 438-441
Page 7: Active Tectonics Basin and Range p. 438-441

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

Page 8: Active Tectonics Basin and Range p. 438-441

Cascade and HLP isotopic similarities

low K-tholeiitesFe Rich Rhyolites End at NewberryQuaternary mafic35-42 km crust

Rattlesnake Tuff

Page 9: Active Tectonics Basin and Range p. 438-441

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?