基于ASTER数据的巴里坤地区蚀变矿物填图及找矿

Alteration Mineral Mapping and Ore Prospecting based on ASTER Data in Balikun,Xinjiang

ASTER图像被广泛应用于蚀变矿物填图中,但综合采用多种方法并对结果进行优选的研究鲜有报道。以新疆巴里坤县三道岭地区为研究区,综合采用比值法和主成分分析法处理ASTER数据进行蚀变矿物填图,利用已知矿点、小岩体、构造、化探异常等信息对各种方法提取的遥感异常结果进行对比、筛选,进而选取最优结果,之后结合地质、化探异常综合分析圈定了15处靶区,通过对其中9处靶区进行野外检查发现铜、金矿化点7处。结果表明多种蚀变矿物填图方法对比、优选较单一处理方法更为有效。

ASTER （Advanced Spaceborne Thermal Emission and Reflection Radiometer） has been used ex tensively in alteration mineral mapping. However, using multi-methods and comparing the results to select the optimal areas,have rarely been reported. Sandaoling in Balikun County,Xinjiang was taken as the study area. Both band ratio and principal component analysis were adopted to map alteration minerals using A- TER data. Multi-information such as ore points, small intrusions, structure, geochemical anomalies were then applied to compare with the remote sensing anomalies to obtain the best results. Fifteen ore explora tion targets were located by synthetic analysis of multi-information including remote sensing anomalies, ge ochemical anomalies and geological data. Through ground inspection of nine targets, seven new mineraliza tion occurrences were discovered. The result shows that using multi-methods for alteration mineral map ping and comparing the results to select the optimal ones are more effective than using a single image pro cessing method.