GEOL 1010 Lecture Notes - Lecture 15: Orogeny, Regolith, Subduction
28 Oct 2016
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Document Summary
If the ground moves so does the gps station: gps stations change as plates move, time series plot shows the gps station"s change in position over time. Mountain building: causes of mountain building - orogenesis, mountain building is driven by plate tectonics. Subduction related volcanic arcs grow on overriding plate. Thrust faults stack up on the far side of the orogen. Island fragments of continental lithosphere can enter trench: added to the overriding plate, called exotic terranes - geologic history differs from. Crustal thickening results from this: fold-thrust belts created on margins of the orogen, center of belt consists of high-grade metamorphic rocks. Crust in collision zone may be twice its normal thickness. Thrusting brings metamorphic rocks to shallow depths. Normal faulting creates fault-block mountains and basins. Landslides: movement of material downslope -- driven by gravity, mass movement -- or mass wasting, is the downslope motion of rock, regolith (soil, sediment and debris), snow, and ice.
