大地微动测深与时间域激电测深在金矿床中的勘查应用——以河南省嵩县东湾金矿床为例  

Application of Geodetic Microtremor Sounding and Time-Domain IP Sounding to the Exploration of the Dongwan Gold Deposit in Songxian County,Henan Province

作　　者：荆鹏 孙进 李水平 康健 齐勇攀 赵华奇 JING Peng;SUN Jin;LI Shuiping;KANG Jian;QI Yongpan;ZHAO Huaqi(No.2 Institute of Geological and Mineral Resources Survey of Henan Co.,Ltd.,Zhengzhou,Henan 450001)

机构地区：[1]河南省第二地质矿产调查院有限公司,河南郑州450001

出　　处：《地质与勘探》2024年第5期982-992,共11页Geology and Exploration

基　　金：河南省地矿局财政规划地质科研项目(编号:豫地矿勘查〔2022〕04号)资助。

摘　　要：河南省嵩县东湾金矿是受陡倾斜断裂构造带控制的构造蚀变岩型矿床,其近南北向断裂构造F_(1)是该矿区的主要含(控)矿构造,沿该含(控)矿构造F_(1)向深部仍存在大规模成矿的可能。传统物探方法为以往矿区中浅部找矿勘查起到了良好的指导作用,但难以适应目前矿区对深部探测的需求,常规的大深度、高分辨率电磁探测方法则因受该矿区较强的电磁干扰和复杂的人文因素制约了其应用。为提高探测精度和深度,确定含(控)矿构造F_(1)在深部的延伸状态及高极化体赋存位置,采用不受电磁背景干扰、探测深度大、分辨率高的大地微动测深与可提供深部金矿化蚀变信息的大功率时间域激电测深联合勘查。根据获得的视S波速度(V_(x))、视电阻率(ρ_(s))和视极化率(η_(s))异常,结合已知地质剖面先验信息,有效地识别了不同岩性地层界面,推测含(控)矿构造F_(1)在纵向上的空间展布特征,认为沿F_(1)构造带的中-低速度、中-低电阻、高极化区为找矿有利部位,据此圈定了深部找矿靶区,为该矿区深部找矿勘查提供了良好的地球物理依据。该研究方法及结果可为东湾金矿区及周边类似矿区深部勘查提供参考。The Dongwan gold deposit in Songxian County,Henan Province is tectonic altered rock type deposit controlled by steeply dipping faulted structural belt.The nearly NE-trending fault F_(1) is the main ore-bearing(ore-controlling)structure in this deposit,and there is still a possibility of large-scale mineralization in the deep fault F_(1).Traditional geophysical prospecting method has played a great guiding role in the prospecting and exploration of the middle and shallow parts of this deposit,but it is difficult to adapt to the current demand for deep exploration.The conventional large depth and high resolution electromagnetic detection method is restricted by the strong electromagnetic interference and complex human factors in the mining area.In order to improve the detection accuracy and depth,and to understand the extension of the fault F_(1) in the deep and the location of the high-polarization body,this work conducted joint exploration of geodetic microtremor sounding without electromagnetic background interference,large detection depth and high resolution,and high-power time-domain IP sounding that can provide information on deep gold mineralization and alteration.According to the obtained apparent S-wave velocity(V_(x)),apparent resistivity(ρ_(s))and apparent polarizability(η_(s))anomalies,combined with the prior information of known geological profiles,the different lithologic and stratigraphic interfaces were effectively identified,and the vertical spatial distribution characteristics of the ore-bearing(ore-controlling)structure F_(1) were inferred.It is considered that the medium-low velocity,medium-low resistance and high polarization areas along the F_(1) structural belt are favorable for prospecting.Based on this,the deep prospecting target areas were delineated,which provide a good geophysical basis for deep prospecting and exploration in the deposit.The research methods and results have certain guiding significance for the deep exploration of the Dongwan gold deposit and similar surrounding mining

关 键 词：大地微动测深 大功率时间域激电测深 容矿断裂构造 深部找矿 东湾金矿 嵩县 河南省 

分 类 号：P618[天文地球—矿床学]