广域电磁法对深部岩体的识别及在找矿中的应用:以胶东龙口—土堆金矿区为例  

Identification and prospecting application of wide filed electromagnetic method to deep pluton:take the Longkou—Tudui gold deposit in Jiaodong as an example

作　　者：蒋永芳 李欢[1] 颜晓华 张婷 魏兴亮 孟超 陈庆 JIANG Yongfang;LI Huan;YAN Xiaohua;ZHANG Ting;WEI Xingliang;MENG Chao;CHEN Qing(School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Hunan Geosun Hi-technology Co.Ltd.,Changsha 410208,China;Hunan Deep Earth Resources Electromagnetic Exploration Engineering Technology Research Center,Changsha 410208,China;Shandong Yantai Xintai Gold Mining Co.Ltd.,Yantai 265147,China)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]湖南继善高科技有限公司,湖南长沙410208 [3]湖南省深地资源电磁法勘探工程技术研究中心,湖南长沙410208 [4]山东烟台鑫泰黄金矿业有限责任公司,山东烟台265147

出　　处：《中南大学学报(自然科学版)》2025年第3期966-978,共13页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2016YFC0600104)。

摘　　要：胶东龙口—土堆金矿床的成矿模式认为深部隐伏岩体的形态及规模对找矿具有重要意义。为了精确探测矿区深部隐伏岩体,拓展深部找矿空间,采用广域电磁法对9条剖面共计1340个测点进行地球物理勘探实验。通过对岩石标本进行物性测量,野外实测数据进行系统处理、反演和分析,综合地质解译,建立矿区三维地质-地球物理模型。利用广域视电阻率变化特征建立矿区的地质体空间格架,对深部岩体和构造界线进行厘定,并对致矿异常进行定性分析。研究结果表明:广域电磁方法能有效地识别深部岩体和大型构造,钻孔揭露的深部岩体顶界面位置与广域探测位置较一致;广域电磁法对郭城断裂、后夼东断裂、史家断裂等大型构造具有较好的识别效果,并能有效反映矿化构造蚀变带走向和延深趋势。The metallogenic model of Longkou-Tudui gold deposit points out the form and scale of buried granitic plutons,which has great prospect.In order to explore the deep hidden pluton and expand the deep prospecting space in the mining area,wide filed electromagnetic method is adopted for prospecting.Through physical property measurement of rock specimens and systematic processing,inversion and analysis of the measured data and comprehensive geological interpretation,a three-dimensional geological-geophysical model was established.Based on the characteristics of wide area apparent resistivity variation,the geological spatial framework of the mining area was established,the deep pluton and tectonic boundary was determined,and the anomalies was qualitatively analyzed.The results show that this method can effectively identify deep pluton and large structures.The location of the top interface of the deep pluton revealed by the late drilling is consistent with that of the wide filed electromagnetic method detection,and it has a good recognition effect on the large structure such as the Guocheng fault,Houkuang East fault and Shijia fault,and effectively reflects the strike and depth of the mineralized structural alteration zone.

关 键 词：广域电磁法 深部勘探 成矿岩体 金矿床 胶莱盆地 

分 类 号：P631[天文地球—地质矿产勘探]