内蒙古林西县东沟萤石矿床地质特征及成矿模式

Geological Characteristics and Metallogenic Model of Donggou Fluorite Deposit in Linxi County, Inner Mongolia

本文以区域成矿理论为基础,对矿区的地层、岩浆岩、构造及流体包裹体特征进行研究,结合野外地质调查并辅以室内镜下观察得出了东沟地区的地质特征及成矿模式。研究表明:NNE向为主要控矿构造;萤石和石英为主要矿物组分,围岩蚀变以硅化为主,垂向分带现象明显;矿体赋存在二叠系大石寨组和侏罗系新民组之中,矿床类型为中低温热液充填型;根据矿体形态、岩石组构及包裹体测温结果,建立了矿床的成矿模式。对萤石矿床的开发利用具有一定的指导意义。

Based on the theory of regional metallogeny, this paper studies the characteristics of strata, magmatic rocks, tectonics and fluid inclusions in the mining area, and combines the field geological survey and the endoscopic observation to obtain the geological characteristics and metallogenic model. The study shows that NNE is the main ore-controlling structure, fluorite and quartz are the main mineral components, and the alteration of the surrounding rock is dominated by silicification, and the vertical zonation is obvious. The orebody exists in the Permian Dashizhai formation and the Jurassic in the Xinmin formation, the type of deposit is medium-low temperature hydrothermal filling type. According to the ore body morphology, rock structure and inclusions temperature measure- ment results, the metallogenic model of the deposit is established.