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UFsubcretion
RTextension tectonics
 plate tectonics
 rifting
 accretionary wedges
 active margins
 subduction zones
 lithosphere
 continental crust
 oceanic crust
 underthrust faults
SNUsed to refer to different concepts in plate tectonics: In areas of rifting and thinning of continental crust, used to describe emplacement of basaltic magma at the base of the continental crust. In oceanic subduction zones, used to refer to accretion of