摘要
为研究灰家堡金矿田电性结构特征及金矿物探找矿标志,以水银洞金矿床为例,围绕灰家堡背斜及F_(101)断裂,在皂凡山段及纳秧段分别开展MT(Magnetotelluric Method,以下简称MT)、CSAMT(Controlled Source Audio-frequency Magnetotelluric Method,以下简称CSAMT)工作。MT方法主要从区域上对地层、构造等大尺度地质体进行探索,注重大区域、大格局,为基础地质、区域成矿地质背景提供支撑;CSAMT方法主要从矿区、矿床上对地层界线、含矿构造、蚀变体等小尺度地质体进行探索,注重层位、构造、蚀变体等细节,为矿区地质勘探、施工提供支撑,两者互补性比较强。通过物性、MT、CSAMT成果资料综合研究,得出研究区总体呈“高阻—低阻—高阻”三层电性结构特征。根据金矿成矿规律,将F_(1)断裂、F_(101)断裂、F_(105)断裂、SBT、灰家堡背斜及其核部的揉皱构造在剖面上表现的电性特征作为物探找矿标志。经与钻孔资料对比分析,物探找矿标志明显,其反映的褶皱、断裂构造、界面位置与钻孔信息基本吻合,为该区找矿预测提供了物探依据,同时物探标志可间接指导金矿深部找矿。
In order to study the electrical structure characteristics of Huijiapu gold field and the prospecting geophysical prospecting signs of gold deposit,the Shuiyindong gold deposit are taken as an example to address the MT and CSAMT work in the Zaofanshan and Nayang sections respectively around the Huijiapu anticline and the F_(101)fault.MT method mainly explores large scale geological bodies such as stratigraphy and structure from the regional perspective,and focuses on macroregional grand patterns,providing support for basic geology and regional metallogenic geological background study,while the CSAMT method mainly explores the stratigraphic boundary,ore-bearing structure,alteration and other small scale geological bodies from the mining area and deposit,and pays attention to the details of horizon,structure,alteration and other details,providing support for geological exploration and construction in the mining area.The two methods are highly complementary.Based on the comprehensive study of physical properties,MT and CSAMT data,it is concluded that the study area is characterized by three-layer electrical structure of“high resistance,low resistance and high resistance”.According to the metallogenic regularity of gold deposit,the electrical characteristics of F_(1)fault,F_(101)fault,F_(105)fault,SBT,and the ruff structure in the core of the Huijiapu anticline are taken as the geophysical prospecting indicators.Compared with the borehole data,the geophysical prospecting signs are obvious,and the fold,fracture structure and interface position reflected by the borehole information are basically consistent.It provides the geophysical basis for prospecting prediction in this area.At the same time,the geophysical prospecting marks can indirectly guide the deep prospecting of gold deposits.
作者
张西君
刘俊
李家斌
屈念念
蒙应华
田郁
李西子
Zhang Xijun;Liu Jun;Li Jiabin;Qu Niannian;Meng Yinghua;Tian Yu;Li Xizi(Engineering Technology Innovation Center of Mineral Resources Exploration in Bedrock Zones,Ministry of Natural Resources,Guiyang Guizhou 550081,China;Guizhou Engineering Research Center of Geologic-Geophysical Exploration Development and Application,Guiyang Guizhou 550081,China;Guizhou Geological Survey Guiyang,Guizhou Guiyang 550081,China)
出处
《工程地球物理学报》
2022年第3期285-295,共11页
Chinese Journal of Engineering Geophysics
基金
中国地质调查局项目(编号:DD20190161)
贵州省地质矿产勘查开发局科研项目(编号:黔地矿科合[2018]31)。
关键词
灰家堡矿田
电性结构
大地电磁法
可控源音频大地电磁法
物探标志
Huijiapu ore field
electrical structure
magnetotelluric
controlled source audio magnetotelluric
geophysical prospecting mark
