双频激电法在寻找有碳质干扰铅锌矿中的应用

Application of dual frequency induced polarization method in prospecting the lead- zinc deposit with carbonaceous interference

工作区位于四川省甘孜西藏—三江造山系中北部,三江弧盆系北端,义敦—沙鲁里岛弧中北段,沙鲁里山弧岩浆岩带上,与呷村大型铅锌银矿在同一成矿带上,具一定的成矿前景。通过在该区开展双频激电工作,采用天然状态下露头物性测定方式,较准确地测定了矿与各岩性的物性参数,然后根据其物性差异对激电中梯圈定的平面异常进行定性分析,对矿致异常和碳质干扰体引起的异常进行区分,在第四系覆盖区新圈出了两个铅锌矿化带,并布置了激电测深剖面,指导槽探和坑探工作的布置,后经槽探和坑道验证,与物探推断结果一致。

The prospecting area is located in the north- central part of the Ganzi- Tibet- Sanjiang orogenic system,northern end of the Sanjiang arc basin system and north- central segment of Yidun- Shaluli island arc and Shaluli magmatic belt. The deposit is in the same metallogenic belt as the large- sized Gacun Pb- Zn- Ag deposit. Therefore,there is favorable prospecting. By carrying out the dual frequency induced polarization in this area and adopting the way of outcrop physical properties determination in natural state,a more accurate physical property parameters of ore and country rocks are obtained. According to the qualitative analysis of plane anomalies caused by physical properties difference and IP intermediate gradient,and on the basis of the distinguishment between ore-bearing anomalies and anomalies induced by carbon interference. Two new lead- zinc metallogenic belts are defined in the covered areas by quaternary sediments. Also,the IP sounding profile is carried out across the metallogenic belt in order to guide the execution of trending and tunneling exploration,the test engineering results are consistent with the interpretation by geophysical prospecting methods.