胶东山后金矿床构造地球化学特征及找矿意义

Tectonic geochemistry characteristics and their significance in mineral prospecting of Shanhou gold deposit,Jiaodong Peninsula

对胶东招平断裂上的山后金矿34个钻孔进行了原生晕测量,分析了Au、Ag、Cu、Pb、Zn、As、Sb、Bi、Mo、Hg等10种元素,统计了微量元素含量及变化。在招平断裂蚀变带中Au、Ag、Pb、Mo、Bi等元素出现了明显富集,而Cu、Zn、Sb、Hg等元素没有富集,山后金矿多金属硫化物阶段不发育;根据聚类分析结果,Au与Ag、Cu、Pb、Zn生成于不同的成矿期,招平断裂中的Au矿体形成于金成矿期,招平断裂上盘荆山群地层中的Au、Ag、Cu、Pb、Zn多金属矿体形成于金银多金属成矿期;根据主矿体微量元素轴向分带特征,认为山后金矿深部还有较大的找矿前景。

Primary halo investigation of 34 drill holes has been carried out in Shanhou gold deposit which hosted in Zhaoping fault zone, Jiaodong Peninsula, China. Au, Ag, Cu, Pb, Zn, As, Sb, Bi, Mo and Hg elements were analyzed. Statistics of trace elements contents and their variations in Jiaodong group, Jingshan group, Linglong granites and altered rock in Zhaoping fault zone show that metamorphic rocks and granites are rich in Bi and Ag while poor in Hg, Sb, Au, Cu, Zn and As. In altered rocks of Zhaoping fault zone, Au, Ag, Pb, Mo and Bi enriched significantly while Cu, Zn, Sb and Hg didn＇ t remarkably enrich. Therefore, the muhi-sulfides phase of mineralization was not well developed in the ore region. According to cluster analysis of the trace elements, the enrichment of Au and other elements like Ag, Cu, Pb and Zn didn＇ t form in the same phase of mineralization. Au ore bodies inner the Zhaoping fault zone formed during the phase of gold mineralization while the ore bodies characterized by Au, Ag, Cu, Pb and Zn in the hanging wall （Jingshan group） formed during the phase of gold and multi-metals mineralization. Finally, based on the axial zoning characteristics, it is proposed that there is a great prospecting foreground in the deep of the Shanhou gold deposit.