Discussion On Chang Han Boluo Zinc-Silver Deposit, Inner Mongolia Geological Characteristics And Genesis

Chang Han Boluo Pb and Zn produced in the northern margin of the North China craton. Since the Archean study area experienced a long evolutionary history, geological activity often accompanied by the formation of so many types of multi-metal deposit. But the study of the deposit is still in its infancy, there are still many problems understanding, so they need to do further research. Lang River lead-zinc deposit is less silver metallogenic belt, faults in the study area development, regional faults with east-west, north-east and north-west-based form a lattice-like fracture systems. Strong regional magmatic activity, with multiple phases, features multi-cycle activities. In the study area of the main lead-zinc, with gold, silver, copper, molybdenum and other mineralization, deposit types in epithermal type, skarn-based. Epithermal deposits have Chang Hanbo Luo, Dong zi, Xishuiquan, Dongshuiquan, etc. Paoshou yingzi, mostly medium and small, in addition to lead and zinc, also associated with silver, copper, these deposits are mainly distributed in Yanshan granitoid intrusions in vitro contact zone late Paleozoic volcanic- sedimentary strata, few ore bodies located in Yanshan intrusions or volcanic rocks, in veins, constructed strictly control the scale and occurrence. Chang Han Boluo Pb and Zn in the zinc-silver mineralization less Lang River with the west. Exposed in the mining area in the mine northeast of exposed strata simple lithology is mainly Permian at Yujiabeigou group basaltic andesite, andesite, is the main object of this study, carried out geological studies deposit identify metallogenic DIAGENETIC Times, as well as a deposit of Sources of mineralization fluids explore geodynamics deposits were formed, revealing its metallogenic mechanism to guide mine prospecting. By petrology, mineral deposit geology, geochemistry and other means, on the basis of field observations and laboratory identification, using a variety of testing methods were studied. Drawn on both sides of the main vein wall rock alteration and development, including pyrite, sericite, silicification, chlorite, epidote petrochemical, carbonate and so on. The main metal mineral galena, sphalerite, pyrite, followed by a chalcopyrite, arsenopyrite, marcasite, magenta silver, tetrahedrite, tennantite, arsenic, cobalt and other mineral Fai, which Crimson silver as the main independent silver minerals. Non-metallic minerals are quartz, sericite, chlorite, epidote, calcite. Mineralization can be divided into three stages:(Ⅰ stage) quartz- pyrite stage,(Ⅱ stage) stage and sulphides(Ⅲ stage) quartz- carbonate stage. Deposit formation may be close to the same period of volcanic- subvolcanic magmatism related to the case of epithermal deposits. This study is useful to understand the mechanism of shallow epithermal mineralization of Pb and Zn, the establishment of mineralization model, but also that the exploration and development of the region of Pb and Zn to provide strong theoretical support.