CVL 423 Lecture 5: geology key terms lecture 5-11.pdf
9 May 2014
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Metamorphism: derives from greek meta to change morpho shape. Metamorphic rocks result from transformation of igneous and sedimentary rocks by metamorphic processes in earth"s crust and mantle. Can from by recrystallization or react with one another. Contact-thermal metamorphism: intruded magma heats up and alters surrounding rock. Dynamic-thermal metamorphism: occurs in fault zones where rocks are exposed to high dynamic acvtivities or impact events. Is restricted to vicinity of igneous intrusions in levels of shallow crust, while lithosphere pressures act. Regional metamorphism: occurs over large areas, convergent plates (heat and pressure) and also along divergent plates. Subduction zone: involve oceanic plates sliding beneath continental plate or another oceanic plate (subducted plate is oceanic while subducting plate may or may not be oceanic) High rates of volcanism, earthquakes and mountain building, subduction zones result in melting of mantle that produces volcanic arc as relatively higher for lighter rock.
