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The alteration of the Permo-Carboniferous coal-bearing series in Henan resulting from the coal thermal metamorphism; a preliminary approach to the influences of thermal groundwater on coal metamorphism


The alteration of the Permo-Carboniferous coal-bearing series in Henan resulting from the coal thermal metamorphism; a preliminary approach to the influences of thermal groundwater on coal metamorphism



Dizhi Lunping = Geological Review 36(2): 130-139



Some changes have taken place in the coal and its surrounding rocks of the Permo-Carboniferous coal-bearing series in Henan affected by hydrothermal activity. Having investigated the characteristics of the alteration of the surrounding rocks and the properties of the hydrothermal solutions, the authors considered that the hydrothermal solutions may be thermal groundwater derived from meteoric waters. With the formation mechanism of the thermal groundwater system as the focus and by applying the relevant view-points in hydrogeology to the study of coal metamorphism, the authors point out that thermal groundwater acts as a heat transfer (convection) medium in the process of coal thermal metamorphism. Furthermore, the alteration characteristics of the clay minerals in the surrounding rocks are used to distinguish the alteration stages of the surrounding rocks, which are made to correspond with the stages of coal metamorphism.

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