西藏帮浦东段—笛给铅锌矿区CSAMT异常特征与深部找矿预测

A study of anomaly characteristics of CSAMT and deep prospecting prediction of the lead-zinc deposits in eastern Bangpu-Digei mining area of Tibet

西藏帮浦东段矿区浅部资源逐渐减少,深、边部开拓势在必行。采用CSAMT在帮浦东段—笛给矿区开展铅锌矿深部勘探与找矿预测工作,利用磁场强度H y计算全区视电阻率共计42840个,得到了勘探区CSAMT全区视电阻率异常图,进一步分析获得导电特性异常区4个,即高阻异常区R1、R2、R3和低阻异常区R4。通过结合以往勘探资料成果,对本次CSAMT资料进行地质解释,建立了相应的找矿预测模型;钻孔验证结果证明了CSAMT预测结果的可靠性。

The shallow resources of lead-zinc deposits are gradually decreasing in eastern Bangpu of Tibet,and hence deep and side exploration is imperative.The authors used CSAMT to carry out deep exploration and make prospecting prediction of lead-zinc deposits in the Bangpu-Digei mining area.The geophysical profiles were deployed in accordance with the 100 m×40 m survey network,and 373 physical points were determined.CSAMT data processing was conducted for the magnetic field intensity so as to calculate the full-region apparent resistivity and obtain the full-region apparent resistivity data at 42840 sites.Then,the CSAMT anomaly map of full-region apparent resistivity in the exploration area were compiled,and four abnormal areas of electrical conductivity were delineated,i.e.,high resistivity abnormal areas R1,R2,R3 and low resistivity abnormal areas R4.Combined with previous exploration data,the authors carried out geological interpretation of CSAMT data and established corresponding prospecting prediction model.The further drilling verification results prove the reliability of CSAMT prediction results.