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The original rock (protolith) could be sedimentary, igneous, or existing metamorphic rock which is subjected to:
- heat (
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- > 200 °C)
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- pressure (> 100 MPa)
megapascals (1,000 bar) or more), causing profound physical or chemical change.
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology + Petrophysics / Rock
[ Sedimentary Rock ] [ Igneous Rock ] [ Metamorphic rock ]