Kinesiology 1080A/B Lecture Notes - Lecture 11: Subsidence, Subduction, Oceanic Basin
13 Nov 2014
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Divergent: continental lithosphere uplifted, splits over mantle plume rift valley, volcanoes along sides. Passive: rift widens to an ocean basin with quiet margins, seds. Andean: oceanic crust sub-ducts under continental crust, forming accretionary wedge continental volcanic arc andesitic to granitic plutons. Continental collision: ocean closes, subduction stops, high mountains. Accreted terranes: foreign crustal fragments stuck onto margin. Uplift: mantle upwelling pushes up lithosphere in continental interiors. Subsidence: sediment load along passive margins, or downward flow in the mantle under continental lithosphere. Original continental crust probably formed by coalescing volcanic arcs above subduction zones.
