The distinction is mentioned below :
(i)Contact Metamorphism : It is also known as local metamorphism. It is a process of change affected by heat in the proximity of magma intrusion in the affected rocks. The heat is produced by both-the heat of magma and associated matter such as water vapour. This metamorphism produces chemical replacement, re-crystallization and mechanical changes in the host rock. As the host rock gets metallic substance from the magma, so it becomes a great source of valuable minerals.
(ii)Regional Metamorphism : It is a process in which the rocks are changed mainly by high pressure. It is also termed tectonic or dynamic metamorphism. The deformation of crystal increases the pressure in the affected region. It is associated with mountain chains. Slaty and plastic deformations are the two important results. Re-crystallization is also seen in this process.
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