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黄金科学技术 ›› 2024, Vol. 32 ›› Issue (1): 1-12.doi: 10.11872/j.issn.1005-2518.2024.01.136

• 矿产勘查与资源评价 •    下一篇

辽东半岛五龙金矿外围电性特征及找矿意义

王兴春1,2(),邱海城3,李建平3(),智庆全1,2,李华4,武军杰1,2,邓晓红1,2,吴琼1,2   

  1. 1.中国地质科学院地球物理地球化学勘查研究所,河北 廊坊 065000
    2.国家现代地质勘查工程技术研究中心,河北 廊坊 065000
    3.辽宁五龙黄金矿业有限责任公司,辽宁 丹东 118012
    4.青海省地质调查局,青海 西宁 810000
  • 收稿日期:2023-10-04 修回日期:2023-12-26 出版日期:2024-02-29 发布日期:2024-03-22
  • 通讯作者: 李建平 E-mail:cat94@126.com;664244146@qq.com
  • 作者简介:王兴春(1975-),男,甘肃白银人,正高级工程师,从事瞬变电磁法研究工作。cat94@126.com
  • 基金资助:
    物化探所中央级公益性科研院所基本科研业务费专项资金资助项目(AS2022Y01);国家重点研发计划项目“华北克拉通辽东/胶东重要成矿区带金多金属矿深部预测及勘查示范”(2018YFC06038)

Peripheral Electrical Characteristics and Its Prospecting Significance of Wulong Gold Deposit in Eastern Liaoning Peninsula

Xingchun WANG1,2(),Haicheng QIU3,Jianping LI3(),Qingquan ZHI1,2,Hua LI4,Junjie WU1,2,Xiaohong DENG1,2,Qiong WU1,2   

  1. 1.Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, Hebei, China
    2.State Research Center of Modern Geological Exploration Engineering Technology, Langfang 065000, Hebei, China
    3.Liaoning Wulong Gold Mining Co. , Ltd. , Dandong 118012, Liaoning, China
    4.Qinghai Provincial Geological Survey Bureau, Xining 810000, Qinghai, China
  • Received:2023-10-04 Revised:2023-12-26 Online:2024-02-29 Published:2024-03-22
  • Contact: Jianping LI E-mail:cat94@126.com;664244146@qq.com

摘要:

辽东五龙金矿经过80余年的开采,矿山资源储备严重下滑,后备资源不足问题日益突出,亟需查明矿区深部和外围矿产资源。通过在v163号脉西北和东南两侧以及100号断裂南侧开展瞬变电磁法测量工作,构建了相应的二维和三维地电模型,分析了矿区低阻异常特征;结合前人研究成果,推断出金矿成因类型和下一步找矿方向。研究结果表明:v163号脉西北方向P0剖面上低阻区是由包括163号脉西北段的细粒闪长岩脉群引起的,属于石英脉型成矿的可能性较大;100号断裂南侧三维地电模型中的低阻区域与大孤顶子金矿矿化点相对应,该低阻区向北侧深部规模增大,异常未封闭,表明该区域北侧深部具有良好的找矿前景,值得进一步开展研究工作;v163号脉东南方向的三维地电模型中,低阻异常值在数量级上明显低于前二者,推测为蚀变带引起,后经工程验证孔揭露,该区域纵向存在多层不连续的硅化蚀变岩,最大厚度为41 m,蚀变类型有硅化、绢云母化、绿泥石化以及不同程度的黄铁矿化。研究表明,五龙金矿不仅存在石英脉型金矿体,还有蚀变岩型金矿体,后者可能是该矿区下一个找矿的主要方向。

关键词: 瞬变电磁法, 石英脉型金矿, 蚀变岩型金矿, 外围找矿, v163号脉, 五龙金矿

Abstract:

The Wulong gold mine in Liaodong has been mined for more than 80 years,the reserve of mining resources has seriously declined,and the problem of insufficient reserve resources is particularly prominent.It is urgent to identify the deep and peripheral mineral resources in the mining area.Through the measurement of transient electromagnetic method(TEM)in the northwest and southeast sides of the v163 ore vein and the south side of the No.100 fault,the corresponding 2D and 3D geoelectric models were constructed,and the charac-teristics of low resistance anomalies in the mining area were analyzed.Combined with previous achievements,the genetic types of gold deposits and the next exploration direction were inferred.The results show that the low resistance area on the P0 section in the northwest direction of the v163 ore vein is caused by a group of fine-grained diorite veins,including the northwest section of the v163 ore vein,which is highly likely to belong to the quartz vein type mineralization.The low resistance area in the 3D geoelectric model on the south side of the No.100 fault corresponds to the Dagudingzi gold deposit.The deep scale of the low resistance area on the north side increases,and the anomaly is not closed,indicating that the deep part of the north side of the area has a good prospecting prospects and it is worthy of further work.In the 3D geoelectric model in the southeast direction of the v163 ore vein,the low resistance anomaly value is significantly lower in magnitude than the former two,suggesting that it is caused by an alteration zone.After the engineering verification hole,it is revealed that there are multiple layers of discontinuous silicified altered rocks vertically in this area,with a maximum thickness of 41 m.The alteration types include silicification,sericitization,chloritization,and varying degrees of pyrite mineralization.This research indicates that there are not only quartz vein type gold orebodies in the Wulong gold deposit,but also altered rock type gold,which may be the main direction of the next pros-pecting in the mining area.

Key words: transient electromagnetic method(TEM), quartz vein type gold deposit, alteration-type gold deposit, peripheral prospecting, v163 ore vein, Wulong gold deposit

中图分类号: 

  • P631

图1

五龙金矿区区域地质图1.片麻状二云母花岗岩;2.古元古界辽河群;3.白垩纪斑状花岗岩;4.侏罗系;5.断裂;6.金矿点;7.工作区及试验剖面"

表1

矿区岩(矿)石电性参数统计"

岩性电阻率/(Ω·m)样品数量/件资料来源

片麻状二云母

花岗岩

4 471~14 9556杜琴(2018)
含矿石英脉岩165~2 5058杜琴(2018)
石英脉岩1 000~100 0007杜琴(2018)
花岗斑岩4 500~13 0006杜琴(2018)
细粒闪长岩3 100~11 0906辽宁有色勘查总院(2003)
花岗闪长岩11 378~83 47018辽宁有色勘查总院(2003)

图2

五龙金矿床地质图及TEM测线部署(修改自俞炳等,2021)1.第四系;2.辽河群于家堡子组;3.混合花岗岩;4.花岗闪长岩;5.片状花岗斑岩;6.微文象花岗斑岩脉;7.花岗闪长岩脉;8.煌斑岩脉;9.细粒闪长岩脉;10.硅化带;11.含金石英脉及编号;12.断裂破碎带;13.金矿脉号;14.竖井及编号;15.TEM测线;16.破碎混合花岗岩带及编号"

图3

P0剖面电阻率反演断面图"

图4

发射框1、2对应的电阻率反演断面图及三维地电模型(a)P05线电阻率反演断面图;(b)P08线电阻率反演断面图;(c)v163号脉外围南东方向三维地电模型"

图5

P53线和P56线电阻率反演断面图"

图6

100号断裂南侧三维地电模型"

表2

ZK319A-1钻孔岩心编录简表"

序号深度区间/m岩心名称岩心描述备注
0~13.2残坡积粉土、粉砂含少量黏土及碎石
13.2~180.3黑云母二长花岗岩、黑云闪长岩、辉绿岩互层黑云母二长花岗岩呈灰白色,细粒花岗岩,块状构造;黑云闪长岩呈黑色,细粒结构,块状构造;辉绿岩呈黑色,辉绿结构,块状构造;灰白色,细粒花岗岩结构,块状构造;局部有硅化、绢云母化
180.3~187.5硅化蚀变岩灰白色,粒状结构,块状构造,矿物成分主要为硅质,蚀变强烈,见有硅化、绢云母化、绿泥石化和伟晶岩化,节理发育,岩心破碎蚀变
187.5~214.9黑云母二长花岗岩灰白色,中—细粒花岗岩,块状构造;
214.9~217.2硅化蚀变岩同③蚀变
217.2~277.5黑云母二长花岗岩及构造破碎带灰白色,中—细粒花岗岩,块状构造;破碎带岩心破碎,见有蚀变
277.5~303.5硅化蚀变岩同⑤,出现少量黄铁矿化蚀变
303.5~306.9构造破碎带硅化强烈,原岩为黑云母二长花岗岩,见有绢云母化和绿泥石化
306.9~356.1黑云母二长花岗岩灰白色,中—细粒花岗岩,块状构造
356.1~369.4黑云闪长岩黑色,细粒结构,块状构造
?369.4~379.5硅化蚀变岩同⑦,局部见黄铁矿化蚀变
?379.5~403.6黑云母二长花岗岩灰白色,中—细粒花岗岩,块状构造
?403.6~413.7硅化蚀变岩同?,局部见黄铁矿化蚀变
?413.7~428.0黑云母二长花岗岩灰白色,中—细粒花岗岩,块状构造
?428.0~433.7硅化蚀变岩同?,局部见黄铁矿化蚀变
?433.7~443.1闪长岩灰绿色,中—细粒变晶结构,块状构造
?443.1~474.3硅化蚀变岩同?,底部黄铁矿化发育蚀变
?474.3~486.3闪长岩、黑云闪长岩分别呈灰绿色和黑绿色,细粒结构,块状构造
?486.3~499.4硅化蚀变岩同?,黄铁矿化发育蚀变
?499.4~562.5黑云母二长花岗岩灰白色,中—细粒花岗岩,块状构造
21562.5~603.9硅化蚀变岩同?,黄铁矿化发育蚀变
22603.9~609.3黑云母二长花岗岩灰白色,中—细粒花岗岩,块状构造
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