基于小波多尺度分析的高精度磁测在广东某多金属矿普查中的应用

Application of high precision magnetic survey based on wavelet multiscale analysis in the polymetallic mineral exploration in Guangdong Province

在工区仅有化探资料和地质填图资料的基础上,为了缩小找矿靶区,提高找矿效益,进行了大比例尺地面高精度磁测工作。采用小波分析对ΔT异常进行位场分离,将场源分解到不同尺度上,采用功率谱分析估算场源体埋深,依据不同岩性磁性差异,圈出岩体分布范围,并识别出与成矿有关的断裂构造。磁法处理结果与化探异常吻合较好,圈出了找矿靶区,并得到了地质的验证,达到了间接找矿的目的,实践应用效果较好。

on the basis of only geochemical exploration data and geological mapping data in the working area,in order to reduce the prospecting target area and improve the prospecting benefit,the large scale surface high precision magnetic survey has been carried out.Wavelet analysis is used to separate the potential field ofΔT anomaly,and the field source is decomposed into different scales.The buried depth of the field source body is estimated by power spectrum analysis.According to the magnetic differences of different lithology,the distribution range of rock mass is circled,and the fault structures related to mineralization are identified.The magnetic treatment results are in good agreement with the geochemical anomalies,the prospecting target area is circled,and the geological verification is obtained to achieve the purpose of indirect prospecting,and the practical application effect is good.