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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.
Contact metamorphism occurs when local rocks are metamorphosed by the heat from an igneous intrusion, such as limestone turning to marble along the contact zone.Some of the changes that occur in the older rock are due simply to the heat radiated from the igneous mass and to the pressures it creates.etamorphism that occurs in the course of increasing temperatures is called progressive. It is accompanied by the loss of volatile components (dehydration, decarbonatization) by the initial rocks. The opposite processes against a background of decreasing temperature are termed regressive metamorphism.