【作者】 武晓波； 燕守勋； 肖春生； 曹春香； 马建文； 庄永成；

【Author】 Wu Xiaobo,Yan Shouxun,Xiao Chunsheng,Cao Chunxiang,Ma Jianwen (The Institute of Remote Sensing Applications,Chinese Academy of Sciences,Beijing 100101) Zhuang Yongcheng (Qinghai Geological Survey,Xining 810012)

【机构】 中国科学院遥感应用研究所； 青海地质调查院；

【摘要】 矽卡岩型是青海东昆仑都兰地区的一种主要成矿类型,矿种为铁、铜、铅锌矿床。该类型矿床的遥感成矿信息为不同方向的线性构造、花岗岩类及火山岩、碳酸盐岩和矽卡岩。运用常规的ETM和ASTER数据,比较了ETM 7-4-1波段合成图像、ETM和ASTER的MPH(掩膜-主成分-色度调整技术)、ETM Crosta技术、ASTER波段比值技术对矽卡岩型矿床成矿信息的图像识别能力。结果表明:ETM 7-4-1波段合成图像能够解译线性构造。该地区线性构造的组合形态符合Riedel左行剪裂系模式,它反映了最新的构造格架。其与成矿之间的联系需要恢复该剪裂系形成前造山带的"开-合"过程和形成后的高原隆升过程来建立;MPH技术能够精细、清晰、鲜明地对地面覆盖类型进行分类,其处理结果图像需要与ETM 7-4-1波段合成图像和地质图比较,以避免虚假岩性图斑和线性构造的解译;ASTER波段比值技术和Crosta技术能够突出增强地表矽卡岩化信息,在植被、风沙等覆盖度达50%以上的高寒都兰地区,找矿意义巨大。但是,对ASTER波段比值技术和Crosta技术能够突出增强地表矽卡岩化的机理将来需要深化研究。更多还原

【Abstract】 The major metallogenic style in Dulan district of eastern Kunlun mountains in Qinghai is Skan style Iron,Copper and Lead-Zinc deposits,the metallogenic condition information of this style deposits are as follows:different trending lineament structures, granites,carbonates and Skan.The common data of TM and ASTER were used,and the methods of common bands compound images of TM bands 7-4-1,TM MPH,ASTER MPH and ASTER bands ratios were used to compare the capability of metallogenic information identification.The results show that the 7-4-1 bands compound image of TM can be used to identify the lineament structures,the terrain and lineaments are showing the newest structural framework,which can be interpreted using Riedel sinistral shear dynamic model,but the relationships of this model with the metallogeny can not be gotten until recovered then opening and closing history of the Kunlun mountains.The TM MPH technique has the capability to finely classify the surface covers,it is needed to compare with the 7-4-1 bands compound image of TM with the MPH image to interpret the geological information in case of the false lineament and geological terrain information from the MPH image;the ASTER bands ratio image and Crosta technique can be used to prominently enhance the Skan information,which is of great significance for skan style mineral exploration,but the mechanics of he ASTER bands ratio image and Crosta technique can be used to prominently enhance the Skan information needs to be further deeply research.更多还原