CSAMT在鄂东南某地区斑岩型铜矿勘查中的应用研究  

Application of CSAMT in the Exploration of Porphyry Copper Deposits in a Certain Area of Southeast Hubei

作　　者：张笑 郭宁宁 徐玳笠 张小波 刘俊安 李贤军 Zhang Xiao;Guo Ningning;Xu Daili;Zhang Xiaobo;Liu Jun'an;Li Xianjun(Hubei Geological Survey,Wuhan Hubei 430034,China;Hubei Key Laboratory of Resource and Ecological Environment Geology,Wuhan Hubei 430034,China)

机构地区：[1]湖北省地质调查院,湖北武汉430034 [2]资源与生态环境地质湖北省重点实验室,湖北武汉430034

出　　处：《工程地球物理学报》2023年第5期637-644,共8页Chinese Journal of Engineering Geophysics

基　　金：湖北省地勘基金(编号:HBT-16170054-170535)。

摘　　要：鄂东南矿集区是长江中下游成矿带七大矿集区之一,地球物理勘探在该区找矿工作中的应用十分广泛,取得了较好的效果。其中,可控源音频大地电磁法(Controlled Source Audio Magnetotelluric,简称CSAMT)具有勘探深度大、分辨能力强的技术特点,被广泛地应用在矿产勘查方面。本研究以鄂东南某地区的斑岩型铜矿勘查工作为例,使用CSAMT进行勘探。通过CSAMT成果解译,刻画了含矿岩体(Ⅳ号石英闪长斑岩小岩体)在深部的空间展布特征,为钻探施工提供了依据。通过钻孔验证,查明了Ⅳ号石英闪长斑岩小岩体的规模和展布,是一直径为50~70 m,沿355°方向陡倾(75°左右)的筒状岩株体;同时,在0号勘探线ZK02钻孔内发现二层铜矿体,厚度分别是2.45 m和2.04 m,品位分别是0.225%和0.696%。The ore concentration area in southeast Hubei is one of the seven major ore concentration areas in the metallogenic belt in the middle and lower reaches of the Yangtze River.Geophysical explorations have been widely used in the prospecting work in this area and have achieved good results,among which,the widely used controlled source audio magnetotelluric method(CSAMT) in mineral exploration unveils the technical characteristics of large exploration depth and strong resolution.This study illustrates the application of CSAMT to the exploration of porphyry copper deposits in a certain area in southeastern Hubei.The interpretation of CSAMT results and the characterization of the spatial distribution characteristics of the ore bearing rock mass(No.IV quartz diorite porphyry small rock mass) provide a basis for drilling construction.Through drilling verification,the scale and distribution of the No.IV quartz diorite porphyry small rock mass were identified as a cylindrical rock mass with a diameter of 50~70 meters and a steep dip(about 75 degrees) along the 355 degree direction.Moreover,two layers of copper ore bodies were found in ZK02 borehole of exploration line 0,with a thickness of 2.45 m and 2.04 m respectively and grade of 0.225 % and 0.696% respectively.

关 键 词：可控源音频大地电磁法 鄂东南 斑岩型铜矿 

分 类 号：P631.3[天文地球—地质矿产勘探]