大量资料表明水参与了超高压变质作用过程。
Many references show that the water is indispensable to the ultrahigh-pressure metamorphism.
煤层气是煤的生成和变质作用过程中形成的一种非常规清洁能源。
Coal - bed gas is a very clean energy that is formed in the course of the formation and metamorphism of the coal.
水活度的演化特征表明，变质流体在变质作用过程中，对变质反应温度起着一定的缓冲作用。
The evolutionary feature of the water activity shows that the metamorphic fluids may have played a buffering role in the metamorphic reaction temperature during the metamorphic stages.
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