晋城矿区无烟煤层中泥岩夹矸的变化特征及成因探讨

通过研究无烟煤层中泥岩夹矸的岩石矿物学特征，探讨其主要成分高岭石发生转化的主要方向及影响因素。对晋城矿区实地观测，并采集一定量的标本，通过显微镜下鉴定、差热分析、X射线粉晶衍射分析、红外吸收光谱分析等研究，发现无烟煤层泥岩夹矸中高岭石主要向伊利石转化，并有伊利石-蒙脱石(I／M)混层矿物及蒙脱石出现。煤的变质程度升高、夹矸矿物转化的主要原因是区域变质作用及周围介质条件的影响。

Characteristics and origin of tonstein intercalations in the anthracite bed of Jincheng mining area

This paper deals with the main transformation directions and the affecting factors of kaolinite as well as the main composition of tonstein by studying the petromineralogical features of tonstein intercalations in the anthracite bed. A series of means, such as microscopic identification, differential thermogram analysis, X_ray powder diffraction analysis, infrared absorption spectrum analysis, were used to study the samples collected from the working field. The research results suggest that kaolinite is transformed toward illite, accompanied by the appearance of I/M and montmorillonite. The heightening of the metamorphic grade of coal and the transformation of its sloam are attributed to the action of regional metamorphism and the influence of the surrounding media conditions.