EH4在深部隐伏岩(矿)体探测中的应用——以东炉房铜钼多金属矿为例  

Application of EH4 in deep concealed rock(ore) body detection: A case study of the Donglufang copper-molybdenum polymetallic deposit, Shangri-la, China

作　　者：李忠 张小兵 汪金明 肖高强 张有荣 段召艳 LI Zhong;ZHANG Xiaobing;WANG Jinming;XIAO Gaoqiang;ZHANG Yourong;DUAN Zhaoyan(Yunnan Institute of Geological Survey(Yunnan Academy of Geological Sciences),Kunming 650216,Yunnan,China;Key Laboratory of Sanfiang Metallogeny and Resources Exploration and Utilization,MNR、Kunming 650051,Yunnan,China;Yunnan Geological Survey,Kunming 650216,Yunnan,China)

机构地区：[1]云南省地质调查院(云南省地质科学研究院),云南昆明650216 [2]自然资源部三江成矿作用及资源勘查利用重点实验室,云南昆明650051 [3]云南省地质调查局,云南昆明650216

出　　处：《地质力学学报》2023年第1期48-59,共12页Journal of Geomechanics

基　　金：中国地质调查局地调项目(DD20160016-14)。

摘　　要：采用音频大地电磁测深(EH4)对东炉房铜钼多金属矿区深部地质构造进行探测分析,有效确定了矿区地下的空间电性和结构特征。通过构建音频大地电磁法(EH4)找矿标志,总结了EH4剖面视电阻率异常特征与矿体关系:浅部呈脉状或柱状低阻体对应中低温热液型金、铅、锌多金属矿体,呈柱状中阻体或中低阻体对应矽卡岩型或斑岩型铜钼多金属矿体,中阻体对应中酸性岩浆岩(玢岩、斑岩)。圈定了矿区深部隐伏矿体11处,其中5处与钻孔吻合,其余6处找矿前景良好;进一步推断在深部岩体中形成规模较大的斑岩型铜钼矿。研究表明音频大地电磁测深法针对东炉房铜钼多金属矿或者该类型矿床寻找隐伏岩(矿)体是有效的地球物理方法。This study uses the method of Audio-frequency magnetotelluric sounding(EH4) to detect and analyze the deep geological structure in the Donglifang mining area. The underground spatial electricity and structural characteristics were effectively determined. We built an EH4-based indicator system for localizing ore bodies and summarized the relationship between the apparent resistivity anomalies and the ore bodies in the EH4 profile. The shallow veined or columnar lowresistance bodies may correspond to the low –medium temperature hydrothermal gold, lead, and zinc polymetallic ore bodies;the columnar medium-resistance or medium –low resistance bodies correspond to the silica or porphyry copper–molybdenum polymetallic ore bodies;the medium-resistance bodies correspond to the medium acidic magmatic rocks(porphyrites and porphyries). We identified eleven concealed ore bodies in the deep of the mine area, five of which are consistent with the drill holes, and the remaining six have an excellent prospect of finding ore bodies. It is further inferred that larger-scale porphyry copper–molybdenum ore bodies are formed in the deep rock body. This study proves that the EH4 is an effective geophysical method for finding concealed rock(ore) bodies in the Dongxuofang coppermolybdenum polymetallic mine or this type of deposit.

关 键 词：EH4 云南东炉房 铜钼多金属矿 电性 隐伏岩(矿)体 找矿标志 

分 类 号：P319.32[天文地球—固体地球物理学]