湖南康家湾铅锌金银多金属矿床地质特征与找矿预测

Geological characteristics and prospecting directions of Kangjiawan Pb-Zn-Au-Ag polymetallic deposit in Hunan

通过分析康家湾铅锌金银多金属矿区的控矿因素发现:①F22逆冲断层是康家湾矿区的主要导矿构造,而与倒转褶皱伴随产生的次级断层、裂隙、节理及层间破碎带是康家湾矿区的容矿构造;②二叠系当冲组硅质岩与栖霞组碳酸盐岩间形成的层间硅化角砾岩带、石炭系壶天群白云质灰岩或白云岩以及侏罗系跃龙组含砾石英长石砂岩为本矿区的主含矿层位;③铅同位素、岩体中铅锌含量和人工重砂中自然金的存在均表明成矿物质主要来源于深部岩浆。在此基础上,结合对康家湾矿区的成矿地质背景、矿床地质特征的分析,对康家湾矿区下一步的找矿思路和方向作出了预测。

Based on analysis of ore-controlling factors of Kangjiawan Pb-Zn-Au-Ag polymetallic mining area, it suggests that （a）thrust fault No.22 is the main ore-transmitting structure of Kangjiawan mining area,and the secondary faults,fractures,joints and interlaminar fracture zone which occurs along with the overturned fold are ore host structure,（b）the major producing formations include interlayer silicified breccias zone which is formed between silicalite of Permian Dangchong formation and carbonates of Qixia formation,dolo-mitic limestone or dolomite of carboniferous Hutian group as well as shingly feldspar-quartz sandstone of Ju-rassic Yuelong group,（c）it is suggested by lead isotope,lead and zinc content in the rock mass and the n-ative gold existed in artificial heavy concentrate that ore-forming material source in this area is the magma at depth.Besides, based on analysis of metallogenic geological background and geological characters of Kangjiawan mining area, the author makes predictions about ideas and directions of prospecting in Kangjiawan mining area in the future.