contact metamorphism of coal
煤接触变质
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伊敏五牧场区存在着从褐煤到贫煤完整的变质系列，其主要煤变质类型为接触变质。
There is a complete metamorphic series of coal from lignite to meager coal in Wumuchang area, Yimin, the main metamorphism type is contact metamorphism of coal.
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