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黄金科学技术 ›› 2021, Vol. 29 ›› Issue (5): 637-646.doi: 10.11872/j.issn.1005-2518.2021.05.032

• 矿产勘查与资源评价 • 上一篇    下一篇

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

俞炳1,2,3(),邱海成4,于昌明1,2(),曾庆栋1,2,3,杜琴1,2,叶杰1,2,李建平4,陈海涛4   

  1. 1.中国科学院地质与地球物理研究所,矿产资源研究重点实验室,北京 100029
    2.中国科学院地球科学研究院,北京 100029
    3.中国科学院大学地球与行星科学学院,北京 100049
    4.辽宁五龙黄金矿业有限责任公司,辽宁 丹东 118012
  • 收稿日期:2021-02-23 修回日期:2021-07-26 出版日期:2021-10-31 发布日期:2021-12-17
  • 通讯作者: 于昌明 E-mail:yubing15@mails.ucas.ac.cn;ycm@mail.iggcas.ac.cn
  • 作者简介:俞炳(1993-),男,浙江嵊州人,博士研究生,从事矿床学研究工作。yubing15@mails.ucas.ac.cn
  • 基金资助:
    国家重点研发计划重点专项“深地资源勘查开采”(2016YFC0600108-06)

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

Bing YU1,2,3(),Haicheng QIU4,Changming YU1,2(),Qingdong ZENG1,2,3,Qin DU1,2,Jie YE1,2,Jian-ping LI4,Haitao CHEN4   

  1. 1.Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China
    2.Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China
    3.College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China
    4.Liaoning Wulong Gold Mining Co. ,Ltd. ,Dandong 118012,Liaoning,China
  • Received:2021-02-23 Revised:2021-07-26 Online:2021-10-31 Published:2021-12-17
  • Contact: Changming YU E-mail:yubing15@mails.ucas.ac.cn;ycm@mail.iggcas.ac.cn

摘要:

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。

关键词: EH4音频大地电磁方法, 控矿构造, 成矿预测, 石英脉型金矿床, 深部隐伏资源, 五龙金矿, 辽东金矿集区

Abstract:

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.

Key words: EH4 magnetotelluric method, ore-controlling structure, metallogenic prediction, quartz vein type gold deposit, deep concealed resources, Wulong gold deposit, Liaodong gold district

中图分类号: 

  • P618.51

图1

五龙金矿区区域地质图(据俞炳等,2020修改)1.第四系;2.上侏罗统小东沟组;3.下震旦统钓鱼台组;4.古元古界辽河群;5.白垩纪斑状花岗岩;6.白垩纪花岗闪长岩;7.侏罗纪片麻状二云母花岗岩;8.主要断裂;9.金矿床(点);10.水库/河流;11.国界"

图2

五龙金矿床地质图(据俞炳等,2020修改)1.第四系;2.片麻状二云母花岗岩;3.花岗斑岩;4.细粒闪长岩;5.煌斑岩;6.辉绿岩;7.断裂;8.矿体及编号;9.EH4测量线及编号"

图3

五龙金矿矿石反射光显微照片和热液蚀变特征(a)黄铁矿和白钨矿赋存在早期的石英±黄铁矿脉中;(b)黄铜矿和方铅矿赋存于中期的石英—多金属硫化物脉中;(c)~(d)金以包体金的形式赋存在石英中;(e)围岩强硅化热液蚀变;(f)围岩硅化和绢云母化热液蚀变;Au-自然金;Ccp-黄铜矿;Gn-方铅矿;Po-磁黄铁矿;Py-黄铁矿;Qtz-石英;Sh-白钨矿"

表1

五龙金矿区岩石电性特征统计(杜琴等,2018)"

岩性电阻率/(Ω·m)样品数/块
片麻状二云母花岗岩4 471~14 9556
细粒闪长岩3 100~11 0906
花岗斑岩4 500~13 0006
白色石英脉1 000~100 0007
含矿石英脉165~2 5058

图4

五龙金矿100线EH4二维反演剖面图"

图5

五龙金矿1000线EH4二维反演剖面图"

图6

五龙金矿1050线EH4二维反演剖面图"

图7

五龙金矿1000线和1050线EH4综合推断解释图"

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