遥感蚀变信息定量提取方法在成矿预测中的应用——以西昆仑塔什库尔干地区为例

摘要

以遥感技术为手段、ETM影像为基础数据,解译了西昆仑塔什库尔干地区主要线、环构造,划分出北西、近南北和近东西向3组主要线性断裂.利用比值和主成分分析等方法,通过异常下限值圈定的数学模型定量提取了铁化、泥化和硅化蚀变信息.综合分析地质、矿产、地球化学及物、化探异常等资料,结合遥感构造解译和蚀变信息,优选了2个Ⅰ类找矿靶区和3个Ⅱ类找矿靶区.%Linear and circular structures of the Taxkorgan region in West Kunlun were interpreted via ETM images. The results show that tectonism in the studying area was intensive. The major linear structures include NW, NS and EW trending faults. The NW trending linear structures are widespread and cut by near EW and NS trending faults, thus, the near EW and NS trending faults are later than the NW trending faults. Mineralized alteration factors were defined by spectral characteristics of the rocks in different bands. Mineralized alteration information was quantitatively extracted by multispectral remote sensing information extraction techniques. Useful alteration anomalies and metallogenic targets were located by multi-geology information integration. According to geological data, structure interpretation results and RS anomaly areas, Aranbaotai Cu-Pb-Zn, Zankan Fe, Baldir Cu-Pb-Zn, Mingtiegai Wcu and Xiruo Mo prospecting targets were proposed. The spatial distribution of remote sensing anomalies is consistent with the known ore deposits, which showed promising application of the method in mineral resource exploration and assessment in West Kunlun.