Metamorphic rock

Jun 28th, 2015
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Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (1500 bars), causing profound physical and/or chemical change.

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Metamorphic rockMetamorphic rocksarise from the transformation of existingrocktypes, in a process calledmetamorphism, which means "change in form".The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 C) and pressure (1500bars), causing profound physical and/or chemical change. The protolith may besedimentary rock,igneous rockor another older metamorphic rock.Metamorphic rocks make up a large part of theEarth'scrustand are classified by texture and bychemicalandmineralassemblage (metamorphic facies). They may be

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