物化探综合找矿方法成功应用——以伊春市伊东林场金矿床的发现为例

The successful application of integrated geophysical and geochemical prospecting methods:an example of the discovery of Yidong forest-farm gold deposit in Yichun City

伊春市伊东林场金矿床位于小兴安岭-张广才岭岩浆弧,伊春-延寿岩浆弧伊春火山盆地边缘,位于伊春Fe-Pb-Zn-Mo-W-Sn-Cu-Ag成矿亚带的中段。1∶5万水系沉积物Au、Ag、As、Sb元素异常强度较高,规模较大,是金及多金属成矿有利部位。选定了该异常区利用物化探综合方法进行找矿。土壤异常以Au、Ag、As、Sb、Mo元素异常为主,Au、Ag元素异常规模较大、强度较高,伴生Cu、Pb、Zn、Hg元素异常,各元素异常浓集中心套合较好。磁场特征为低磁,电场特征为低阻高极化。经过对物化探异常验证,发现了伊东林场金矿床,说明在伊东林场利用物化探综合方法找矿是成功的。

Yidong forest-farm gold deposit is located at the margin of Yichun volcanic basin of XiaoxinganlingZhangguangcai magmatic arc and Yichun-Yanshou magmatic arc,which is located in the middle of Yichun Fe-Pb-Zn-Mo-W-Sn-Cu-Ag metallogenic sub-belt.The anomaly intensity of Au,Ag,As,Sb elements in 1:50000 scale stream sedimentary survey is high with a large scale.It is a favorable target area for gold and polymetallic mineralization.Therefore,the anomaly area is selected to apply the comprehensive method of geophysical and geophysical exploration for prospecting.The soil anomaly is mainly characterized by Au,Ag,As,Sb,Mo element anomaly,Au,Ag element anomaly scale is large,and the intensity is high.They are associated by Cu,Pb,Zn,Hg element anomaly.The concentration center of each element anomaly is combined with each other.The magnetic field is characterized by low magnetic field and the electric field is characterized by low resistance and high polarization in this area.Through the verification of geophysical and geophysical anomalies,Yidong forest-farm gold deposit has been found out.It is shown that the application of comprehensive method of geophysical and geophysical exploration is successful for prospecting in Yidong forest-farm area.