Types of metamorphic rocks: regional metamorphism, contact metamorphism and dynamic metamorphism.

变质岩类型: 区域变质 、 接触变质和动力变质.

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On the condition of thermal contact metamorphism, clay minerals in coal are changed into andalusite.

无烟煤中红柱石是煤中粘土质矿物经热接触变质作用形成的.

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Magmatic contact metamorphism can lead to the variations of distribution patter of REEs in coal.

岩浆接触变质作用可导致煤中稀土元素分布模式的变化.

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