缅甸蒙育瓦地区遥感地质解译与矿化蚀变信息提取

Remote sensing geological interpretation and extraction of mineralization and alteration information in Monywa area,Myanmar

依据蒙育瓦地区ASTER影像数据特征,最佳指数法与中值滤波分析能有效增强线性构造、环形构造信息,特定蚀变矿物组合的主成分分析方法在提取铁染蚀变信息、羟基蚀变信息中能有效剔除干扰噪音,有效波段的比值运算在针对明矾石化的提取与实地地物吻合度较高。结合研究区北部蒙育瓦铜矿床构造及蚀变特征,选择光谱角法分类,验证和优化异常范围,最后对含矿建造、构造和铁染异常、羟基异常、明矾石化3类叠加异常的解译和评价,结合含矿建造圈定了6个找矿靶区,为找矿选区工作提供充分依据。

According to the characteristics of ASTER image data in Monywa area,the optimal index method and median filter analysis can effectively enhance the information of linear structure and circular structure,and the principal component analysis method of specific altered mineral combination can effectively eliminate interference noise in extracting iron stained alteration information and hydroxyl alteration information.The ratio operation of effective band has a high degree of coincidence with field features in the extraction of alum fossilization.Combined with the structure and alteration characteristics of Monywa copper deposit in the northern part of the study area,spectral angle method was selected to classify,verify and optimize the anomaly range.Finally,the interpretation and evaluation of three types of superimposed anomalies,including ore bearing formation,structure and iron staining anomaly,hydroxyl anomaly and aluminization,were interpreted and evaluated.Combined with ore bearing formation,six prospecting target areas were delineated,which provided sufficient basis for ore prospecting and selection.