The Structural Characteristics And Ore-controlling Structur Of Inner Mongolia Taipusiqi Jindouzi Mountain Lead-zinc Deposit

Inner Mongolia Jindouzi mountain deposit is a typical hydrothermal lead-zinc silver polymetallic deposit which mainly comprise with Pb-Zn and silver associated. Its tectonics locates in the north edge of North-China Platform, Baiyunebo rift belt.In this paper, the theory and methods of genesis and metallogenic series for hydrothermal deposit were applied to analyse the geological characteristics and ore-controlling structure of Jindouzi mountain lead-zinc deposit. Based on the analysis of tectonic geochemical and geophysical anomalies combined with the regularity of ore formation and the ore-prospecting marks, research on seeking-ore prediction has been done. Contents of thesis are as follows:Geological characteristics in mining area were discussed form strata, magma, and structure. Results suggested that Baiyunebo stratum was considered as the source bed; structure, as the main impact factor of mineralizing, dominated the invasion of metallogenic rock and the formation and positioning of ore body; Yanshanian magmatic rock was favourable metallogenic parent rock.Geological characteristics of Jindouzi mountain deposit were studied; more analysis was conducted on Vein I from the changes on position, shape, occurrence, dimension and grade of ore body, texture and structure of ores, wall rock alteration and metallogenic phase.The results of the ore-control structures study suggested that structure is the key factor of mineralizing in Jindouzi mountain lead-zinc deposit. Relationships of structure and mineralizing mainly showed as follows: 1. making the activation transfer of ore-forming materials; 2. providing the occurrence space for mineralization; 3. serving as the lead ore channel for migration of ore fluid. Tectonic movement always led to magma activity, which resulted in the activation transfer of mineral-laden fluid driven by tectonic dynamics and magmatic thermal. Fracture zone caused by tectonic movement provided the lead ore channel and occurrence space for mineralization. Haojiayingzi fracture was considered as the rock-control structure, transpressional fracture zone in the deposit was the passage-away and host structure for ore fluid.Pb+Zn+Ag deposit type was presented in terms of studying on geochemistry, and evaluation analysis on anomalous areas of Pb, Zn, and Ag was also conducted. Research of dual-frequency induced polarization scanning and induced polarization sounding were performed in the deposit and anomalous areas were evaluated. Zonation of metallogenic elements showed as: from the interior of W, Mo combination to Cu, Fe (high-medium temperate zone) to Zn, Pb, Ag combination (low temperate zone).Based on the above, deep and adjacent prospecting target areas were suggested in the light of hydrothermal ore-forming series theory and summary of the geological, geophysical and geochemical favourable ore-prospecting evidence and information.