辽东半岛五龙金矿外围电性特征及找矿意义

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

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41m,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。

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 characteristics 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 finegrained 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 prospecting in the mining area.