内蒙古北大山银铅多金属矿床地质特征及控矿因素分析

在晚侏罗世中晚期由于岩浆岩的侵入活动,大石寨组变质砂岩、板岩角岩化,在与大石寨组接触带内侧,形成中低温热液侵染、裂隙充填型银铅多金属矿床,矿区内蚀变矿化多赋存在北东向构造内。围岩蚀变较为发育,与成矿关系密切的有硅化、黄铁矿化、绿泥石化、碳酸盐化等。文章在以往地质成果的基础上,通过成矿地质背景、矿区地质概况和矿床地质特征的阐述,着重对成矿控制因素、矿床成因及找矿标志进行分析,认为该区具有较好的成矿地质条件和找矿前景。

Analyisis on Geological Characteristics and Ore-controlling Factors of Beidashan Ag-Pb Polymetallic Depoisit in Linxi County, Inner Mongolia

Through analysis on the rock and ore-forming factors and the geological characteristics of the deposit, the paper found out that in the magmatite intrusion activities in middle and late Jurassic, the medium and low temperature hydrothermal intrusion and fissure filling type Ag-Pb polymetallic deposit formed in the inner contact zone of the metasandstone and hornfelsic slate in Dashizhai formation with Dashizhai group. The alteration mineralization occurs within the ne structure. The alteration of surrounding rock is relatively developed, which is closely related to mineralization, such as silicification, pyrite mineralization, green mud fossilization, carbonation and so on. Based on the previous geological results, the metallogenic geological background, regional geology and geological features of deposit are described in this paper. It focuses on analysis about the control factors of mineralization, ore genesis and prospecting and summed up that there is good ore-forming geological conditions and prospecting potential in this area.