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Field Geog Final (1)
Field Geog Final (1)
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Field Geog FinalSierra Nevada Arc - ANS-tectonic setting: volcanic arc
rock type: granodiorite
-subduction zone causes WET MELTING of ultramafic and mafic rock
-rocks rise with heat and crystallize, becoming more felsic
-some mafic magma does rise, crystallizing into mafic rock
Great Valley Group - ANS-tectonic setting: forearc basin
rock type: siltstone, mudstone, sandstone, conglomerate
-once a marine deposit in a forearc basin, TURBIDITY CURRENTS bring in flows
of sediment which were deposited in graded beds
Franciscan Complex - ANS-tectonic setting: accretionary prism
rock type: sandstone, chert, gabbro, basalt, serpentinite, blueschist
-accreted (mixing) between the subducting and overriding plate at a subduction
zone with landslides causes MELANGE of many different rock types
Monterey Formation - ANS-tectonic setting: deep marine
rock type: siltstone, mudstone, diatomite, chert
Santa Margarita Formation - ANS-tectonic setting: shallow marine
rock type: mudstone with fossils
Morro-Islay Volcanic Chain - ANS-tectonic setting: subduction zone, slab window
rock type: dacite
-as mid-ocean ridge moved closer to continental crust, a slab window formed
where the oceanic lithosphere subducted
-California switched from a convergent boundary to a transform boundary
-allowed for volcanism along the coast
Los Osos Valley Fault - ANS-tectonic setting: thrust fault
-thrust fault uplifts the San Luis Range while forcing Morro Bay and Los Osos to
sink and subside allowing seawater and sediments into the estuary
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