利用TM数据进行金矿化蚀变信息提取方法探讨

利用ＴＭ数据进行金矿蚀变信息提取时在以下几方面应予以考虑：不同研究区金矿床可能有不同的蚀变组合类型，进而有不同的波谱响应特征；如何有效剔除植被干扰因素的影响同时又不致于漏失植被发育区的蚀变信息；如何有效剔除与金矿成矿作用无关的地质单元和其他非地质干扰因素的影响，以冀北张家口金矿化集中区的一段作为研究区，在典型金矿地物波谱测试的基础上，通过波段比值分析，图象掩膜处理，Ｋ－Ｌ变换，２值化处理等步骤对上

A METHOD OF TM REMOTE SENSING DATA USED IN EXTRACTING GOLD MINERALIZED ALTERATION INFORMATION

When we extract gold mineralized alteration information from TM remote sensing data,the following aspects should be considerde: in different study areas,gold deposits probably have different altered combination types,and then have different wave spectral respons features; how to effectively avoid the disturbing influences by vegetation,and meanwhile not lose the altered information in vegetative areas; how to effectively avoid the disturbing influences by the geological body which is not related to gold metallogenic process and by other nongeological factors.Based on the wave spectrum test of altered rocks of the typical gold deposits in the research area,the TM remote sensing data is used in extracting gold mineralized alteration information by spectral bands ratio analysis,image mask processing,KL transform image processing and twovalues image processing.The extracted information can provide a certain basis for gold metallogenic prognosis.