基于大功率激电的甘肃北山多金属矿勘查  

Exploration of Beishan Polymetallic Deposit in Gansu Province Based on High Power Induced Polarization

作　　者：郭伟立[1,2] 冀显坤 白运[1] GUO Weili;JI Xiankun;BAI Yun(Xi’an Center of China Geological Survey;China-SCO Geosciences Cooperation Research Center)

机构地区：[1]中国地质调查局西安地质调查中心,陕西省西安市710054 [2]中国—上海合作组织地学合作研究中心

出　　处：《现代矿业》2023年第1期22-26,37,共6页Modern Mining

基　　金：中国地质调查局地质调查项目(编号:DD20221804,DD20160009)。

摘　　要：为了实现甘肃北山地区找矿突破,通过对该区前期已圈定出的Au、Cu、Pb、Zn等多金属元素地球化学异常区进行查证,针对性地在重点研究区开展大功率激电中梯和对称四极测深工作。通过激电中梯数据处理分析,圈定出三条高极化率异常带,综合地表地质调查及物性统计资料分析认为,IP-2号激电异常是多金属成矿的有利地段。在IP-2号激电异常中心位置布设了2条对称四极激电测深剖面,进一步揭示激电异常的空间展布特征,为钻孔布设提供参考依据。最后在Ⅱ号激电测深剖面通过钻孔验证,发现黄铁矿化及多金属硫化物矿化体,厚度达11.84 m,与激电异常位置吻合较好,但地层中黄铁矿较为发育,带来一定的干扰因素。根据钻探和探槽结果分析,认为该区仍具有较好的找矿前景,可以开展进一步的勘查工作。In order to achieve a breakthrough in ore prospecting in the Beishan area of Gansu prov-ince,the geochemistry anomalies of Au,Cu,Pb and Zn have been identified in the area,and high-powerinduced polarization are carried out in the key research area. Through the induced polarization data process-ing and analysis,three high-polarization anomaly zones are delineated.Based on the analysis of surfacegeological survey and physical property statistics,it is concluded that IP-2 anomaly is a favorable area forpolymetallic mineralization. Two symmetrical quadrupole IP sounding profiles are arranged at the center of IP-2 anomaly,which further reveals the spatial distribution characteristics of induced polarization anomalyand provides reference for borehole layout. Finally,Section Ⅱ was verified by drilling It is found that thethickness of pyrite and polymetallic sulphide mineralized body is 11.84 m,which is consistent with the in-duced polarization anomaly. However,pyrite was relatively developed in the strata,which brought certaininterference factors. Based on the analysis of the results of drilling and trough prospecting,it is consideredthat the area has good prospecting prospects and can be further explored.

关 键 词：大功率激电 电阻率 极化率 多金属硫化物 

分 类 号：P618.2[天文地球—矿床学] P631.3[天文地球—地质学]