可控源电磁法三维反演在甘肃花牛山铅锌矿勘查中的应用  

Application of 3D inversion of CSAMT in Huaniushan lead-zinc deposit exploration in Gansu

作　　者：圣安陈 杨悦[1] 李亚彬[1] 邹宗霖 翁爱华[1] SHENG An-chen;YANG Yue;LI Ya-bin;ZOU Zong-lin;WENG Ai-hua(College of Geo-exploration Science and Technology,Jilin University,Changchun 130026,China)

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《世界地质》2020年第4期878-887,共10页World Geology

基　　金：国家重大科学仪器设备开发专项(2011YQ05006010)。

摘　　要：为研究甘肃花牛山铅锌矿田地球物理特征,进而寻找花牛山地区铅锌成矿的有利部位,笔者利用有限内存拟牛顿法三维反演技术对研究区的可控源电磁勘探数据进行了计算反演。结合前人的激电法测量成果,可控源技术较好探明了研究区地下的三维电性结构,成功划分出矿区北西走向的花黑滩—双峰山控矿断裂,同时圈定出了成矿带附近的铅锌成矿远景区。可控源电阻率模型显示,研究区铅锌矿产于震旦系洗肠井群千枚岩与大理岩接触带附近,找矿电性标志为中、低阻过渡带部位。In order to study the geophysical characteristics of Huaniushan lead-zinc deposit and find out the favorable position of lead-zinc mineralization in Huaniushan area,the authors use 3D L-BFGS inversion method to carry out calculation inversion of the CSAMT data.Combining with the previous TDIP method measurement results,the underground 3D electrical structure in the study area is well proved by the controllable source technology,the NW-extending Huaheitan-Shuangfengshan ore-controlling fault is successfully identified,and the prospective area of lead-zinc mineralization near the metallogenic belt is delineated.The resistivity model results show that the lead-zinc deposit in the study area is located near the contact zone between phyllite and marble of Sinian Xichangjing Group,the electrical indicator of prospecting is the medium-low resistivity transition zone.

关 键 词：可控源音频大地电磁 三维反演 花牛山 铅锌矿 有限内存拟牛顿法 

分 类 号：P631.325[天文地球—地质矿产勘探]