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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.
Geothermal gradients in the earth caused by radioactive decay are the most common cause of temperature differences and thus a cause of metamorphism. As a general rule, heat increases as depth into the earth increases. The gradient creates different types of rocks at different depths.