(II) On the basis of zones of Influence-On this basis the metamorphism is of two types:-
(a) Contact Metamorphism - The magma emitted out of fissures flows into empty spaces in the rocks. When the empty spaces are filled with magma, the temperature and pressure of the rocks increase. The maximum metamorphism takes place at the contact zones and metamorphism decreases as we move away from the contact zones. Batholith produces most of the metamorphism. There are many examples of contact metamorphism in the Deccan of India and the Garnate area of North America.
(b) Regional Metamorphism - The sedimentary strata are crumpled, crushed and folded due to pressure developed in geosynclines. This is mainly due to pressure and not temperature but effect of temperature is also found to work on the rocks in the interior. Examples of regional metamorphism is found in the Alps, the Himalayas, the Rocky, etc.
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