深部金属矿综合地球物理响应与综合预测方法——以金川超大型铜镍硫化物矿床为例

Comprehensive geophysical responses and comprehensive prediction method for deep metal deposit--A case study of Jinchuan super-large Cu-Ni sulfide deposit

深部金属矿探测是目前资源勘查的重要方向,地球物理方法探测深度大、分辨率高,是深部金属矿探测最有效手段之一。以金川铜镍硫化物矿床为背景,在综合分析地质背景、岩石物理性质的基础上,对航磁数据进行了多尺度分离,确定了在Ⅰ、Ⅱ、Ⅲ、Ⅳ矿区西南侧深部具有良好的找矿远景。综合利用航磁、重力、CSAMT剖面测量数据的反演结果,分析各方法异常特征,结合已知典型岩矿体分布,揭示了构造带附近的中低电阻率、高密度、高磁异常区为有利的找矿位置。根据该特征确定了深部找矿靶区,推测找矿靶区深度超过1000 m,为钻探提供了重要依据。

Deep metal deposit prospecting is an important direction of resource exploration at present,and the geophysical method is one of the most effective methods for deep metal deposit prospecting with deep reach and high resolution.In the case study of Jinchuan Cu-Ni sulfide deposit,on the basis of comprehensive analysis of geological setting and petrophysical properties,the aeromagnetic data are separated in a multiscale way,and the deep part of the southwest part ofⅠ,Ⅱ,Ⅲ,Ⅵdistricts is determined to have a good prospecting prospect.The data inversion results of aeromagnetic,gravity and controlled source audio frequency magnetotelluric sounding(CSAMT)survey profiles are comprehensively used to analyze the abnormal features of each method and the geophysical marks of typical ore bodies,the medium-low resistivity,high density and high magnetic anomalous area near the tectonic belt are revealed to be favorable spots for ore prospecting based on the distribution of known typical rock ore bodies.The target area of deep prospecting has been determined on the basis of the characteristics and the target area is estimated to be more than 1000 meters deep.The study provides important basis for drilling.