metamorphic rock
Sign in to saverock arising from metamorphism of original rock under high heat and pressure
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Metamorphic rock is rock that has been transformed from its original form by exposure to extreme heat and pressure deep within the Earth. These rocks matter because they help geologists understand the geological forces and history of our planet.
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Quartzite, a type of metamorphic rock Metamorphic rock, deformed during the Variscan orogeny, at Vall de Cardós, Lérida, Spain
Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock (protolith) is subjected to temperatures greater than 150 to 200 °C (300 to 400 °F) and, often, elevated pressure of 100 megapascals (1,000 bar) or more, causing profound physical or chemical changes. During this process, the rock remains mostly in the solid state, but gradually recrystallizes to a new texture or mineral composition. The protolith may be an igneous, sedimentary, or existing metamorphic rock.