西藏羌多地区遥感蚀变与构造信息提取及成矿预测  

Extraction of the Remote Sensing Alteration and Structure Information and Metallogenic Prognosis in Qiangduo Area,Tibet

作　　者：龙晓君[1,2] 何政伟[1,2,3] 刘严松[1,2] 夏福瑞[1,2] 薛东剑[1,2] 李喆[1,2] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059 [2]成都理工大学信息工程学院,成都610059 [3]首都师范大学资源环境与地理信息系统北京市重点实验室,北京100037

出　　处：《国土资源遥感》2010年第2期63-67,72,共6页Remote Sensing for Land & Resources

基　　金：国家"十一.五"科技支撑计划项目(编号:2008BAK49B02);国家863重点项目(编号2007AA120306);四川省杰出青年学科带头人培养计划项目(编号:06ZQ026-014);四川省教育厅自然科学重点项目(编号:2006A116)共同资助

摘　　要：使用ETM遥感图像,在分析地物光谱特征基础上,利用PCI软件,通过掩模技术去除白泥地、水体、阴影、植被等干扰信息,采用主分量分析、波段比值和阈值分割技术对西藏西部羌多地区进行了铁染及羟基蚀变信息提取;根据明显异常区建立参考谱,创新利用光谱角法剔除假异常信息;结合研究区线性构造的特点,对研究区进行成矿预测,圈定找矿远景区。提出的成矿预测方法比较灵活且效果明显,为今后加快地质找矿工作提供了一条可供参考、行之有效的途径。Based on an analysis of the spectral characteristics of surface objects and using ETM remote sensing image,the authors utilized PCI software and employed the mask technique to remove various kinds of disturbance information such as white mud ground,water body,shadow and vegetation.With principal component analysis,band ratio and threshold segmentation techniques,the information of iron staining and hydroxyl alteration in Qangdoi area of western Tibet was extracted.In accordance with the obvious anomalous areas,the reference spectra were built up.The method of spectral-angle mapper was used to remove the pseudo-anomaly information.In conjunction with the characteristics of linear structure in the study area,the metallogenic prognosis was carried out and,as a result,the prospect areas were delineated.The method for metallogenic prognosis proposed in this paper is fairly flexible and effective,and can provide a reference and effective way for speeding up the geological exploration work in future.

关 键 词：主分量分析 阈值分割 蚀变信息 成矿构造 光谱角 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]