Characteristics of telemagmatic metamorphism of the Ceshui Formation coal in Lianyuan coal basin

The Ceshui Formation coal is mostly anthracite and its metamorphism has been less documented. By analyzing systematically the reflectance of vitrinite and the results of X-ray diffraction of the Ceshui Formation coal in the Lianyuan coal basin, the spatial variation characteristics of coal ranks, coal metamorphic regions, the extension of coal metamorphic belts, coal metamorphic gradients, coal chemical structure and the effect on the degree of metamorphism of heat-production and storage conditions, buried depth of the Indosinian-Yenshanian granites at the margins of the Lianyuan coal basin are discussed. The research results in conjunction of the features of regional hydrothermal alterations, endogenetic deposits with the Ceshui Formation coal measures, and the development of secondary vesicles indicate that the telemagmatic metamorphism is the main factor leading to the metamorphism of the Ceshui Formation coal in the region studied.