EH4音频大地电磁方法在辽东五龙金矿控矿构造及成矿预测研究中的应用

五龙金矿是辽东金矿集区最大的石英脉型金矿床，已累计探明金资源量大于80 t，作为一个开采多年的老矿山，当前面临着矿山资源储量严重不足的问题，亟需寻找深部隐伏资源。通过应用EH4音频大地电磁方法，在五龙金矿的东西两侧分别布设了100线、1000线和1050线3条EH4测量线，采用标量TM模式对原始测量数据进行收集并复核，经计算机处理后绘制出EH4二维反演剖面图。在EH4二维反演剖面图上成功识别出了分别位于矿区东西两侧的100^#断裂和鸡心沟断裂，其垂向延深均超过1 000 m。经过地质观察和坑道钻孔工程揭露，断裂带地表和浅部均存在着明显的金矿化，表明这些断裂在五龙金矿成矿过程中起着重要作用。将EH4音频大地电磁方法应用于五龙金矿控矿构造及成矿预测研究中，取得了良好的效果，矿区东、西部和深部均具有良好的找矿潜力，为矿区下一步地质找矿指明了方向。

Application of EH4 Magnetotelluric Method in Ore-controlling Structure and Metallogenic Prediction of the Wulong Gold Deposit in Liaodong Peninsula

Wulong gold deposit is the largest quartz vein type gold deposit in the Liaodong gold district.The accumulated proven gold resources are more than 80 tons with an average grade of 5.35×10^-6.The fault structure is well developed and magmatic activity is widespread in the Wulong gold deposit，thus it has good metallogenic potential.Wulong gold deposit has been mined for many years，the gold reserve is reducing steadily，so it is urgent to find deep concealed gold resources.The physical properties of different rocks have been tested and analyzed in Wulong mining area，which show that their resistivities are significantly different，and they have the geophysical prerequisites for prospecting and exploration.EH4 magnetotelluric method is one of the advanced techniques in geophysical exploration system，especially in ore-control structure and metallogenic prediction.In this study，the EH4 magnetotelluric method was used，and sounding data acquisition and two-dimensional inversion calculations were carried out on the east and west sides of Wulong gold deposit.Three EH4 measuring lines of No.100，No.1000，and No.1050 were laid out on the east and west sides of the Wulong gold deposit.The lengths of these EH4 measuring lines are 1 000 m，800 m，and 800 m，respectively.Specifically，the line of No.100 on the east side is mainly used to detect the NNE-trending 100^# fault，while the lines of No.1000 and No.1050 on the west side are mainly used to detect the NNE-trending Jixingou fault.The scalar TM mode was adopted in the EH4 test work in Wulong gold deposit.On the basis of the above work，we first check the original measurement data，then perform computer processing，and finally draw the EH4 2D inversion profile.The EH4 two-dimensional inversion profile has effectively identified the 100^# fault and Jixingou fault on the east and west sides of the Wulong gold deposit with vertical extensions exceeding 1 000 m.In addition，field geological observations and tunnel or drilling projects showed that there is obvious gold mineralization on the surface and shallow parts of these fault zones，which indicated that these fault structures （100^# fault and Jixingou fault） play an important role in the Wulong gold mineralization.The results of this study show that the EH4 magnetotelluric method is effective in the study of ore-controlling structure and metallogenic prediction in the Wulong gold deposit.The eastern，western and deep areas of the Wulong gold deposit have quite good prospecting potential，which points out the direction for the further prospecting.