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regional magmatic thermal metamorphism of coal
expl.
煤区域岩浆热变质作用
大规模岩浆侵人含煤岩系或其外围,在大量岩浆热和岩浆中的热液与挥发性气体等的影响下,导致区域内地热增高,使煤发生变质的作用
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