Diastrophism
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All processes that move, elevate or build up portions of the earth’s crust come under diastrophism.
They include:
- orogenic processes involving mountain building through severe folding and affecting long and narrow belts of the earth’s crust;
- epierogenic processes involving uplift or warping of large parts of the earth’s crust;
- Earthquakes involving local relatively minor movements; plate tectonics involving horizontal movements of crustal plates.
- Orogeny is a mountain building process whereas epeirogeny is continental building process.
- Through the processes of orogeny, epeirogeny, earthquakes and plate tectonics, there can be faulting and fracturing of the crust.
- All these processes cause pressure, volume and temperature (PVT) changes which in turn induce metamorphism of rocks.
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