多因素严重干扰区成矿围岩蚀变信息的计算机图像处理──以加拿大西北某地找金实践为例

THE COMPUTER IMAGE PROCESSING FOR METALLOGENETIC WALL-ROCK ALTERATION INFORMATION IN A SERIOUSLY DISTURBED AREA BY MULTIFACTORS ──A CASE HISTORY OF GOLD EXPLORATION IN AN AREA OF NORTHWEST CANADA

本文从分析ＴＭ各波段图像信息特征入手，在冰雪和植被等环境因素干扰严重的地区，试验应用了图像掩膜、波段比值、主成分分析等技术，成功地从ＴＭ图像中提取了与金成矿有关的蚀变围岩信息。在此基础上，进一步研究了蚀变与断裂构造和围岩类型的关系，确定了金矿找矿远景区。

Starting from the analysis on the image information at various TM wave bands,in thispaper,technologies such as image masking,wave band ratio and major composition analysishave been tested and applied in an area seriourly disturbed by such environmental factors assnow and vegetation,and information of wall-rock alteration in relation to gold metallogenesis has been successfully extracted from TM images. On this basis,further study has beenmade on the relationship of alteration with fault structure and lithologies wall rocks,so thatthe prospective area for gold exploration has been determined.