安徽省五河县金多金属矿床地质特征及找矿预测研究

Geological characteristics and prospecting prediction of gold polymetallic deposits in Wuhe county,Anhui province

安徽省五河县金多金属矿床位于蚌埠隆起区东段。研究区构造特征复杂,岩浆活动频繁,特殊的地质条件造成本区具有良好的金多金属矿成矿背景。为了进一步揭示本区域成矿特征,指导后期找矿工作,对该区域的矿床普查资料认真总结,同时结合区域物化探数据、矿石镜下及实验室分析进行分析。研究结果表明:五河县金矿床均定位于晚太古界五河群西堌堆组地层中;矿体形状复杂,分枝复合常见,层控特征显著。本区地层中Au、Ag、Cu、Pb、Zn、As、Sb等元素的背景含量均高于全省的平均含量。根据物化探异常、地层及岩性、北东向构造等特征将本区初步划分成四个找矿远景预测区;首次提出在今后找矿工作中加强对负磁异常分布范围的研究;五河县金矿床找矿预测具有“三位一体”指示成矿特征,即地层岩性、物化探异常和北东向容矿构造。

Wuhe gold polymetallic deposits in Wuhe county of Anhui province is located in the east of Bengbu uplift.The structural characteristics are complex in the study area,magmatic activities are frequent,the area has a good prospect of gold mineralization because of special geological conditions.To further reveal the metallogenic characteristics of the region and prospecting work may be guided at later stage,the survey data of the deposit were summarized carefully in the region.Meanwhile,the data had been analyzed on the data of regional geochemical exploration,ore microscope and laboratory analysis.The results indicated that:The Wuhe gold polymetallic deposits are all located in Xigudui formation of Wuhe group of late Archean in the area;Both the shape of ore bodies and its branched are complex,it has obvious characteristics by stratification.The background contents of Au,Ag,Cu,Pb,Zn,As and Sb were all higher than the average content of the whole province.The area was divided into 4 prospecting areas according to the characteristics of geochemical anomaly,strata and lithology,north-east tectonics,and it was the first time to propose that enhanced a geological job on the distribution range of negative magnetic anomalies in the future prospecting work.The prediction of gold deposit has the characteristics of“trinity”and it may be indicated prospecting,that is stratum,lithology,geophysical and geochemical anomalies and northeast ore bearing structure in Wuhe county.