可控源音频大地电磁测深法在甘肃寨上金矿区的找矿应用研究  

Application of Controlled Source Audio Magnetotelluric Sounding Method in Prospecting of Zhaishang Gold Mine,Gansu Province

作　　者：郑振云[1] 轩慎英 郑洁[2] 刘召军[3] 

机构地区：[1]武警黄金第二总队,河北廊坊065000 [2]中冶京诚工程技术有限公司,北京100176 [3]武警黄金第五支队,陕西西安710100

出　　处：《黄金科学技术》2017年第2期7-13,共7页Gold Science and Technology

基　　金：黄金工作业务费项目"甘肃省岷县寨上矿区岩金普查"(编号:2016020501)资助

摘　　要：寨上金矿区地表覆盖层较厚,蕴藏有较多的隐伏含金破碎带。野外地质工作发现矿区内多数含金破碎带与围岩界限不清,南北矿带金矿体的围岩类型不同,致使电阻率差别较大。因此,在南北矿带两端和深部选择合适的物探方法寻找含金破碎带显得十分必要。根据矿区实际找矿情况,在南北矿带开展可控源音频大地电磁测深工作,研究该方法找矿的有效性。结果表明:南矿带电阻率异常与含金破碎带吻合较好,根据高低阻异常梯度带进行找矿的效果较明显;北矿带岩(矿)石电阻率异常差别较小,找矿效果较差,特别是北矿带西端岩(矿)石电阻率普遍较低,采用该方法对找矿毫无指导意义。此次工作成果可为下一步布置可控源音频大地电磁测深工作提供一定的参考。The overburden of the earth＇s surface is thickness in Zhaishang gold deposit,and there are many concealed gold bearing fractured zone.Field geological work discovery that the boundary between most of gold bearing broken zone and surrounding rock is not clear, and the surrounding rock types of south and north gold belts are different, which leads to a large difference in resistivity.Therefore, it is very necessary to select suitable geophysical method to find gold bearing fractured zone at the edges and deep of south and north gold belts. According to the actual prospecting situation in the gold mine,the controlled source audio frequency magnetotelluric sounding is carried out in the south and north gold belts, and the effectiveness of the method for prospecting is studied.The results show that the resistivity anomaly of south gold belt is consistent with the gold bearing broken belt,the prospecting effect is obvious according to the gradient of high and low resistance anomaly.The difference of rock resistivity in north gold belt is small, and the prospecting effect is poor, especially the rock resistivity of the west part in north gold belt is generally lower, so the method have no significance for prospecting.The results of this research can provide some references for next arrangement of controlled source audio frequency magnetotelluric sounding.

关 键 词：可控源音频大地电磁测深法 寨上金矿区 找矿效果 甘肃省 

分 类 号：P618.51[天文地球—矿床学]