招平断裂带夏甸—姜家窑段构造地球化学找矿预测

Tectonogeochemical prospecting prediction of Xiadian- Jiangjiayao ore-section in Zhao- Ping fault zone

夏甸—姜家窑测区位于招平断裂带中段。招平断裂带在该区段大致沿玲珑花岗岩与胶东群变质岩接触带展布,总体走向42°,倾向SE,倾角37°-52°。主要金矿体赋存于招平断裂带主裂面下盘黄铁绢英岩化碎裂岩和黄铁绢英岩化花岗岩中。本次地表构造地球化学测量面积约12.6 km^2,采集样品352件,测试元素包括Au、Ag、Cu、Pb、Zn、As、Sb、Hg、Mo、Bi、Mn等19种。Au元素异常与Ag和As元素异常有普遍套合性,与Cu、Pb、Zn、Sb元素异常呈局部套合性。结合多元统计分析,测定针对深部矿体预测的构造地球化学标志Au-Ag-As,元素组合异常以及斜交参考因子得分Y（i,3）异常和Y（i,7）异常。在现采矿区深、边部所对应的地表区域圈定出深部隐伏矿体找矿靶位4处。

Xiadian - Jiangjiayao prospecting district is located in the middle part of Zhao - Ping fault zone. Zhao -Ping fault zone stretches roughly along the contact zone of Linglong granite and Jiaodong group metamorphic rocks. It is of a 42° trend,the tendency is SE and the dip angle is 37° to 52°. Its main ore bodies are deposited in the beresitization cataelasite and beresitization granite in the footwall of primary fracture in Zhao - Ping fault. During the measurement of tectonic geochemistry on the surface,352 samples were collected in the area of about 12.6 km2 and 19 elements were tested including Au, Ag, Cu, Pb, Zn, As, Sb, Hg, Mo, Bi, Mn. Au anomaly and As＆Hg anomaly are obviously related,and it＇s partially related with Cu, Pb, Zn and Sb element anomalies. Based on multivariate statistical a- nalysis, element combination anomaly of Au - As - Hg, which is the tectonogeochemical mark of deep orebody prospecting prediction,and oblique reference scores Y（ i,3 ） and Y（ i,7 ） are determined. On the surface corresponding to the deep area and edge of the explored orebodies,4 ore prospecting targets were delineated to find the deep concealed orebodies.