湖南半边山金矿成矿地质条件与找矿前景分析

Analysis on ore-forming geological conditions and prospecting potential of Banbianshan gold deposit in Hunan

湖南半边山金矿赋矿地层为新元古界青白口系冷家溪群黄浒洞组(Qbh);受北东向与近南北向构造联合控制,两组断裂构造交汇部位是金矿富集最有利部位;区域中酸性岩体为成矿提供热源和动力;围岩蚀变主要有褪色化、硅化、黄铁矿化、褐铁矿化、绢云母化、绿泥石化、碳酸盐化;矿床成因属于中低温热液石英脉型矿床,可划分为两个成矿期、四个成矿阶段。半边山金矿与区域上肖家山金矿床具有相似的成矿地质环境和矿床特征,具备小型到中型金矿的找矿潜力。本文在对研究区前期工作系统分析总结的基础上,通过矿床地质地球化学分析,讨论了矿床成因并提出了有利找矿地段。

The host strata of Banbianshan gold deposit is the Huanhudong(Qbh)formation,the Lengjiaxi Group of the Neoproterozoic Qingbaikou system,which is jointly controlled by NE-trending and nearly SNtrending structures.The intersection of these two fault structures is the most favorable location for gold enrichment.The intermediate and acid rocks in this region provided heat source and power for mineralization.The wall rock alteration mainly includes fading,silicification,pyrite,limonite,sericite,chlorite and carbonate.The genesis of ore-forming in the study area belongs to the middle and low temperature hydrothermal quartz vein type deposit,which can be divided into two metallogenic periods and four metallogenic stages.The ore-forming geological environment and characteristics of deposits are similar to those of the Xiaojiashan gold deposit,thus the study area has prospecting potential for small-medium sized gold deposits.Based on the systematic analysis and summary of the previous works in the study area,this paper discussed the genesis of the deposit through geological and geochemical analysis and put forward the next favorable prospecting place.