In this article we will discuss about:- 1. Meaning of Metamorphism 2. Factors of Metamorphism 3. Kinds of Metamorphism 4. Metasomatism 5. Effects of Metamorphism 6. Metamorphic Grades, Zones and Facies. Meaning of Metamorphism: Any pre-existing type of rock forming a part of the crust may or may not undergo any physical, chemical or structural change for any time after [...]
Metamorphic processes cannot be either observed directly or demonstrated practically. They are very gradual, large-scale processes involving geological times measurable in terms of millions of years. It is only through the study of their effects on the rocks that conclusions can be drawn regarding the nature of the process through which those rocks have passed. Different rocks behave differently under [...]
The following points highlight the four main forms and types of metamorphism. The types are:- 1. Contact Metamorphism 2. Regional Metamorphism 3. Hydro-Metamorphism 4. Hydro-Thermo-Metamorphism. Type # 1. Contact Metamorphism: Contact metamorphism takes place when the mineral composition of the surrounding rocks known as aureoles is changed due to intense heat of the intruding magmas. This process of metamorphism is [...]