综合物探在新疆某锌矿勘查中的应用

Application of Comprehensive Geophysical Prospecting to Exploration of a Zinc Mine in Xinjiang

新疆鄯善县阿奇山地区的铅锌矿分布广泛,查找铅锌矿的标志就是寻找含多金属硫化物矿(化)体。为了在已知矿权外探查含锌矿(化)体,进一步确定含锌矿(化)体的空间分布特征,使用激电中梯和对称四极激电测深法,结合重力、钻探方法对该区进行了探查。结果表明:激电、重力异常及化探元素异常均位于工区中部,极化率最大值为9%,电阻率为几十到几百欧姆,剩余重力异常为3mGal,重力异常与激电异常吻合较好,为高密度高极化中低阻异常,推断该异常即是由含锌的矿(化)体所引起,结合重力三维反演和已知钻孔物性信息,确定了含锌矿(化)体的空间分布特征。该矿(化)体倾向为NW向,倾角在60°左右,长约3.34km,宽约1km,深度范围为150~600m,与背景场的密度差为0.10~0.68g/cm3。此次勘查实践表明,将激电法、重力以及钻探方法联合应用于寻找含多金属硫化物矿(化)体方面是可行的,可以为后期钻探及找矿提供可靠的基础资料。

The Pb-Zn is widely distributed in Shanshan county,Xinjiang and the sign of finding lead-zinc deposits is to find polymetallic sulphide minerals.In order to explore the zinc minerals that are located in the outside of the known mineralization,and moreover to determine the spatial distribution characteristics of the zinc minerals,the area was explored by using the IP intermediate gradient and IP sounding method with the combination of the gravity and drilling method.The result shows that the anomalies of IP,gravity and geochemical element are located in the middle of this area.The maximum value is 9%;the resistivity is from tens to hundreds of ohm and the residual gravity anomaly is 3mGal.The anomaly of gravity is coincided well with IP anomaly,which represents the anomaly of high-density,high polarization and low resistivity.It is possible to conclude that the anomalyis caused by the zinc-bearing,and the spatial distribution characteristics of the zinc-bearing are determined with the combination of the three dimensional inversion of gravity and the physical information of the known boreholes.As a consequence,the ore body is inclined to the northwest,about 60 degrees lean,3.34 km long,1km wide,from 150to600 mdepth,and the density difference of the background field is 0.10~0.63g/cm3.The exploration practice shows that it is feasible to apply the joint method of IP,gravity and drilling method to find polymetallic sulphide ore bodies,which are basic data for later drilling and ore prospecting.