Contact metamorphism.
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Contact metamorphism occurs in the vicinity of an igneous intrusive rock as a result of thermal effects of the hot magma. ... Contact metamorphism is thus primarily a thermal phenomenon. It may occur in diverse tectonic settings such as in orogenic or anorogenic environments, in plate interiors or along plate margins.
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Metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). The change occurs primarily due to heat, pressure, and the introduction of chemically active fluids.
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