构造与蚀变信息在找矿预测中的综合应用——以西藏西部某地区为例  

THE COMPREHENSIVE USE OF STRUCTURE AND THE ALTERATION INFORMATION IN PROSPECTING AND FORECASTING MINERAL RESOURCES

作　　者：龙晓君[1] 何政伟[1,2] 夏福瑞[1] 许辉熙 

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]成都理工大学地球科学学院,成都610059 [3]四川德阳建筑职业技术学院,德阳618000

出　　处：《物探化探计算技术》2010年第3期325-331,224,共7页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：遥感图像蚀变信息的提取是遥感地质找矿的一个重要方法,地质构造信息作为一种指示信息对找矿也具有非常重要的意义。利用ETM+卫星影像数据,运用PCI软件通过掩膜技术去除白泥地、水体、阴影、植被等干扰信息,采用主成份分析法和波段比值,阈值分割技术,对西藏西部某地区进行了铁染及羟基蚀变信息的提取,并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、环形构造的特点,对研究区进行成矿预测,圈定找矿远景区。此工作方法较灵活且效果明显,为今后加快地质找矿工作提供了一条可参考,并行之有效的途径。The extraction of alteration information in the image is a important aspect of remote sensing geological prospecting.The geological structure information as one kind of instruction information has also the very vital significance to prospecting.This article shows the results of eliminating disturbance information such as the white putty land,water body,shadow and vegetation through masking wiping off technique and the iron and the pelization alteration information extraction in the area of somewhere in west Tibet based on the ETM+ satellite phantom data and PCI software.And the reference spectrum is established according to obvious ellipse area,the false abnormal information is eliminated by use of spectrum angle method.And a metallogenic prognosis and the selection of the prospecting prospect area in the study area is made by the characteristics of linear ring structure information of the study area.This method is obviously effective and flexible and provides one referable and effective way to speeding up the geological prospecting work.

关 键 词：主成份分析 阈值分割 铁染蚀变 羟基蚀变 成矿构造 光谱角 

分 类 号：P208[天文地球—地图制图学与地理信息工程]