【摘要】 拜仁达坝银多金属矿床位于内蒙古克什克腾旗,大地构造位置处于兴蒙造山带中部,是内蒙古东部地区超大型银铅锌多金属矿床。矿体主要赋存于断裂构造中,呈脉状。矿石类型包括块状、条带状、浸染状、脉状、网脉状矿石。文章通过对拜仁达坝银多金属矿床地质特征详细剖析、流体包裹体和H、O、S同位素研究,分析矿床的成矿流体、成矿物质来源,探讨成矿过程及矿床成因。研究结果表明,成矿流体为中温、低盐度流体,成矿流体主要来源于岩浆水,晚期有大气水的混合,成矿物质以深源为主。与矿化有关的流体包裹体中含甲烷包裹体,表明成矿流体属还原性流体。出溶岩浆流体远程运移后温度和压力下降、与还原性地层反应后氧逸度降低是成矿的主要机制。结合成矿动力学背景,认为拜仁达坝银多金属矿床是受断裂控制与燕山期岩浆活动有关的中温热液脉型矿床。更多还原

【Abstract】 The Bairendaba Ag polymetallic deposit is located in Hexigten Banner, Inner Mongolia Autonomous Region. The geotectonic location is located in the middle of the Inner Mongolia orogenic belt, and it is a super large Ag polymetallic deposit in the eastern part of the Inner Mongolia. Ore bodies mainly occur in fault structures and are veins. Ore types include massive, disseminated, striped, veined, reticular ore. Based on the detailed analysis of fluid inclusions and H, O, S isotopes, the ore-forming fluids and sources of ore-forming materials are analyzed, and the genesis and metallogenic mechanism of the deposit are discussed. The results show that the formation of the deposit is closely related to the Yanshanian magmatic activity, and the ore-forming fluid is medium-low temperature and low salinity fluid; the ore-forming fluid comes from the mixing of magmatic water and atmospheric water, which is the product of long-distance mineralization of porphyry system, and the ore-forming material comes mainly from deep source. Methane-bearing inclusions in fluid inclusions related to mineralization indicate that the ore-forming fluids are reductive fluids. The main mechanism of ore deposits is the decrease of oxygen fugacity caused by temperature and pressure drop and reaction with reductive strata. Based on the metallogenic dynamic background, it is considered that the Bairendaba Ag polymetallic is an epithermal deposit controlled by faults and related to Yanshanian magmatism.更多还原