应用多重分形奇异值分解(MSVD)技术提取钦杭成矿带南段文地地区Cu-Pb-Zn矿致地球化学弱异常

基于Matlab平台编制的多重分形奇异值分解程序,可以有效地从钦杭成矿带南段文地地区比例尺1∶50 000水系沉积物数据中提取Cu-Pb-Zn矿致地球化学弱异常。结果表明,多重分形奇异值分解技术能够克服Ag、Au矿引起的Cu、Pb、Zn高背景的影响,并从多重地球化学背景中有效提取矿致异常,包括低背景中的弱异常和隐蔽异常。该方法揭示了一系列Cu、Pb、Zn统计方法圈定的异常图上没有显示的、规模不等的矿化异常,其中的一些异常和一系列矿床、矿点、矿化点重和,在未知区得到的弱异常也有进一步开展工作的意义,这为该区矿床勘查提供了新的靶区,为未知矿床的探寻提供了新的启示。

Multifractal Singular Value Decomposition (MSVD) for Extraction of Cu-Pb-Zn Weak Geochemical Anomaly in Wendi Area,South Qinzhou-Hangzhou Joint Belt

A multifractal singular value program on MATLAB platform was effectively used to delineate geochemical anomalies based on 1:50000 scale stream sediment data from Wendi area, in the South Qinzhou-Hangzhou joint belt. The separation of Cu, Pb, and Zn by the MSVD method could effectively identify Cu-Pb-Zn mineralization anomaly from the high geochemical background caused by Ag-Au deposits and extract Cu, Pb and Zn mineralization anomaly information from multi-geochemical background, including week and hidden anomalies. These anomalies extracted by MSVD method are consistent with the majority of copper, lead, and zinc ore deposits, but the Cu-Pb-Zn anomalous extracted by statistical method are not consistent with the majority of Cu-Pb-Zn  ore deposits. These weak anomalies on the MSVD anomalous map are significant for further work in the unknown area. The method is very effective for mineral resource prediction in Wendi area.