内蒙古大井锡铜多金属矿床流体成矿机理及外围找矿预测  

Metallogenic mechanism of fluid and prospecting forecast of Dajing Sn-Cu polymetallic deposit,Inner Mongolia

作　　者：王莉娟[1] 王京彬[1] 王玉往[1] 龙灵利[1] 

机构地区：[1]有色金属矿产地质调查中心,北京100012

出　　处：《岩石学报》2015年第4期991-1001,共11页Acta Petrologica Sinica

基　　金：危机矿山项目(200699105);国家重点基础研究发展规划(2007CB411304);国家自然科学基金项目(41202064;40273021;40672061)联合资助

摘　　要：大井矿床老区锡铜及老区东部砷铜石英脉矿体是大井矿床的一个矿化中心,从该矿化中心向外,流体均一温度、盐度递减,由老区的Sn、Cu及老区东部As、Cu矿体向外逐渐演化为晚阶段Sn及Cu、Pb、Zn、Ag矿体。老区中心富锡及富铜流体是不同来源的流体,反映了该矿床可能存在不同的多个矿化中心,来自不同矿化中心不同矿化阶段的流体在同一空间叠加成矿。大井矿床西区的西北部预测区细脉浸染状矿体成矿流体与大井矿区脉状矿体的流体完全不同,总体显现了斑岩型流体包裹体的高温-高盐度及流体沸腾的特征。推测大井矿床外围预测区可能是大井矿床另一个矿化中心,其深部可能存在斑岩型矿化的新类型。Central Sn-Cu orebody of old area and As-Cu orebody of east old area are the mineralized center of Dajing deposit. From the center to the brim,the homogenition temperature and salinity are degression and from Sn-Cu orebody evolvede gradually Sn orebody of late phase and Cu-Pb-Zn-Ag orebody. The fluid that rich in Sn and rich in Cu are different origin in old area of Dajing deposit. This reflect that there are more than ore mineralized center. The fluids come from different mineralized center and period mineralize in same space. The forming-fluid from joint vein orebody in forecast area in northwestward of Dajing deposit western is not the same completely with Dajing deposit and It shows totality the fluid characteristic of high temperature-salinity and boiling of porphyre type deposit. So we infer that the orecast area in peripheral of Dajing deposit mainly is the other one of mineralized center and texisten new mineralize type of porphyre orebody in its deep.

关 键 词：大井矿床 锡铜多金属 成矿流体 找矿预测 内蒙古 

分 类 号：P618.41[天文地球—矿床学] P618.44[天文地球—地质学]