WorldView-3影像与ASTER热红外影像在内蒙古卫境地区铀矿勘查中的应用

Application of WorldView-3 and ASTER TIR for the Exploration of Uranium in Weijing,Inner Mongolia

利用多源影像开展蚀变信息提取,以促进内蒙古卫境地区铀矿地质勘查工作。基于WorldView-3(WV-3)影像特点及典型蚀变矿物光谱特征,通过主成分变换提取Al-OH、Mg-OH、Fe-OH、CO32-及Fe3+类蚀变矿物。利用ASTER(先进星载热发射和反射辐射仪)热红外影像,通过波段运算反演SiO2含量信息。经对上述蚀变信息和基础地质资料的综合分析,圈定出一处铀成矿有利地段,并进行部分区域的野外查证,取得了较好的找矿效果,为该区后续铀矿勘查提供了参考。

In order to promote uranium exploration in Weijing,Inner Mongolia,multisource images were used to extract alteration information.According to the image characteristics of WorldView-3(WV-3)and the spectral characteristics of typical altered minerals,Al-OH,Mg-OH,Fe-OH,CO32-and Fe3+related alteration minerals were extracted by principal component transformation.And the SiO2 content was also retrieved by band operation using ASTER thermal infrared image.After that,a comprehensive analysis of the above alteration information and basic geological data was conducted,and a favorable area for uranium mineralization was delineated.Finally,field validation was carried out in this area.This research has obtained good prospecting effect,which will provide a reference for subsequent uranium exploration in this area.