- 2073 Shrawan · 2 marks
Cataclastic and plutonic metamorphism
Short answer
Cataclastic metamorphism is rock change by intense mechanical stress and crushing with little heat, forming mylonite. Plutonic metamorphism is recrystallisation at great depths under high uniform temperature and pressure, forming gneiss from granite.
Define cataclastic metamorphism and plutonic metamorphism of rock formation.
Cataclastic metamorphism
Cataclastic (dynamic) metamorphism is the change of a rock into a new form by intense mechanical stress and crushing, such as during faulting and mountain building (folding), without much heat. The minerals are broken and ground down, with little recrystallisation (examples: mylonite, fault breccia).
Plutonic metamorphism
Plutonic metamorphism is the change of rocks at great depths in the crust under very high temperature and very high, uniform (all-round) pressure caused by deep burial. The rock texture and minerals are recrystallised (example: gneiss from granite; granulite).
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