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Regional metamorphism is metamorphism that occurs over broad areas of the crust. Most regionally metamorphosed rocks occur in areas that have undergone deformation during an orogenic event resulting in mountain belts that have since been eroded to expose the metamorphic rocks.
Metamorphic rocks form from preexisting rocks (either igneous, sedimentary, or other metamorphic rocks) that have been altered by the agents of metamorphism, which include heat, pressure, and chemically active fluids. During metamorphism some of the material must remain solid.igmatites, fall into a transition zone somewhere between. âtrueâ igneous rocks and âtrueâ metamorphic rocks. I. Metamorphism A. The transformation of one rock into another by temperatures and/or pressures unlike those in which it formed B. Metamorphic rocks are produced from 1. Igneous rocks 2.