The Extraction of Wall Rock Alteration Information Related to Gold Deposits in Harqin Banner Area of Eastern Inner Mongolia by Using ETM+ Remote Sensing Technique
内蒙古东部喀喇沁旗地区金矿围岩蚀变遥感信息提取及成矿预测

Lots of gold deposits exist in Harqin Banner area within the eastern part of Inner Mongolia. Using the ETM+ remote sensing technique combined with field work,the authors extracted and analyzed the wall rock alteration and mineralization information of gold deposits in this area. The results show that the distribution of gold deposits in this area are obviously controlled by regional tectonics, and alterations related to gold mineralization are composed mainly of silicification and ferruginous minerals, with minor clay minerals. Three ore-forming belts are developed in this area, consisting of two EW-trending belts and one NE-SW-trending belt. The favorable area for gold mineralization lies in the southeast of the Harqin Banner area,and rich gold ore bodies might exist in the intersections between EW-trending faults and NE-SW-trending faults, where wall rock alterations are relatively intense. It is shown that the remote sensing information of mineralization and alteration can clearly reveal the potential areas of gold mineralization, and hence has some guiding significance in the exploration of gold deposits.