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在构造挤压作用下,当煤系及其下伏地层受到压缩时,岩石内部的颗粒之间发生内摩擦而伴随析出的热量,是引起煤变质的一个普遍因素。后成煤期继续活动着的一些山字型构造,其前弧或反射弧的展布方位往往与高变质煤带相一致。如沿长江中、下游展布的晚二迭世高变质煤带与淮阳山字型的前弧挤压带相吻合;川南～黔西北的弧形高变质煤带与黔西山字型前弧挤压带相一致,黔西南的弧形高变质煤带与云南广西两个山字型构造反射弧的重迭部位相一致,等等。某些挽近时期有强烈活动的经向构造带内,也常出现高变质煤
Under the action of tectonic compression, when the coal series and the underlying strata are compressed, internal friction between the particles in the rock and the accompanying heat are the common factors that cause coal metamorphism. After the coal-forming period, some mountain-shaped structures continue to be active, and the distribution of the front arc or reflection arc is always consistent with that of the highly metamorphic coal belt. For example, the late Permian metamorphic coal belt distributed along the middle and lower reaches of the Yangtze River is consistent with the pre-arc crushing belt of the Huaiyang Mountain. The arc-shaped high-quality coal belt in the south of Sichuan to the northwest of Guizhou coincides with the Qianxi- The compression zone is consistent with the fact that the arc-shaped high-quality coal belt in southwestern Guizhou coincides with the overlapping parts of the two arc-shaped structural reflex arcs in Guangxi and Guangxi Provinces, and so on. Some metamorphic coal often appears in the meridional tectonic belt with strong activity in the recent past