激发极化法在辽宁本溪某矽卡岩型铜多金属矿勘查中的应用

测区燕山期大面积中酸性岩浆侵入寒武系、奥陶系碳酸盐岩,在岩体外接触带上形成大量的矽卡岩,并伴有较强烈的铜多金属矿化。本次物探工作在1∶5万区调工作基础上,采用激电中梯与激电测深两种方法进行金属矿产勘查,圈定激电异常12个,反演了穿过JD3、JD7、JD8高极化异常体的形态,规模及埋深,并解译隐伏断裂2条。结合区内地质特征与钻孔资料,认为异常区的低阻高极化体是岩体外接触带上矽卡岩化蚀变带的反映,断裂为矿液运移、容矿提供了有利条件。该研究成果表明,激发极化法是寻找矽卡岩型铜多金属矿的有效方法。

Application of the induced polarization method in exploration of a skarnized copper polymetallic deposit in Benxi, Liaoning Province

The work area is characterized by wide intrusion of intermediate-acid igneous rocks of Cambrian and Ordovician carbonate during Yanshan period. Thus in the external contact zones developed a large amount of skarn rock with strong copper polymetallic mineralization. On the basis of regional investigation work (1:50000), the induced-current midgradient survey and IP sounding were used to explore metallic minerals. It delineated 12 IP anomalies, revealed the shape, size and depth of abnormal bodies through IP anomalies of JD3, JD7, and JD8 by data inversion, and interpreted 2 buried faults. Considering the geological characteristics and drilling data, the low resistivity and high polarization anomaly bodies were considered to be the response of the contact zone on the skarn alteration zone, and fractures created favorable conditions for the migration of ore fluid and ore-containing. The research results show that the induced polarization method is an effective approach for exploring the skarn type copper polymetallic deposits.