中国西部喀喇昆仓明铁盖多金属矿化区的卫星遥感勘查

The Satellite Remote Sensing Exploration in Mintiegai Polymetallic Mineralization Area, Kalakunlun Mountains, Western China

成矿环境的地质分析与遥感探测标志是矿产遥感定位的关键 ,高寒山区大面积的冰雪覆盖给应用遥感技术勘查矿产资源带来困难 ,经喀喇昆仑区域大地构造背景、成矿环境与标志分析 ,认识到燕山期花岗岩、花岗闪长岩内外接触带受断裂控制的热液脉型矿床是明铁盖地区的首选矿产遥感目标。利用掩膜去掉冰川和积雪后的主成分变换 (MPCA)技术处理陆地卫星TM数据 ,MPCA3,5和 6合成图像揭示了褐铁矿化等蚀变色调异常信息 ,花岗闪长岩环形影像及其南缘构造透镜体等成矿蚀变和构造的组合信息 ,明确了野外验证目标 。

It is the key for locating mineralized area with remote sensing technique to analyze the metallogenic geological environment and remote sensing information. It is very difficult to explore mineral resources in the high mountains where covered with glacier and snow. Through analysis of the geological setting, metallogenic environment and metallogenic marks, it has been well aware that the preferential target for remote sensing exploration is the hydrothermal vein type ore deposit which is located in the outer or inner contact zones of granite or granodiorite intrusion controlled by faults. The technique of Masking and Principal Component Analysis (MPCA) has been used to process the Landsat TM data, and the glacier and snow are masked. The MPCA 3,5,6 composite imagery shows the anomalous tone of limonnite and silicic alteration and the circular feature of granodiorite intrusive rock as well as the lens like structure in south of the circular image. The processed TM imagery has delineated the target for field investigation. At last, the Luobugaizigou polymetallic mineralized area is found.