Regional metamorphism is the process of metamorphism that occurs over large areas of the Earth's crust, typically due to tectonic forces and associated heat and pressure. This process often results in the transformation of pre-existing rocks, such as sedimentary or igneous rocks, into metamorphic rocks, characterized by new mineral assemblages and foliation. The significance of this process is evident in understanding the rock cycle, as it illustrates how rocks can change forms under specific geological conditions, while also providing insight into metasomatism and the classification of metamorphic facies based on temperature and pressure conditions.
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