基于ASTER数据的遥感蚀变信息提取——以内蒙古万合永火山盆地为例

Extraction of Alteration Information by Using ASTER Remote Sensing Data: A Case Study of Wanheyong Volcanic Basin,Inner Mongolia

应用ASTER遥感影像数据对内蒙古万合永火山盆地进行了铁染、羟基蚀变信息提取研究,结果显示已知矿化点、异常点(带)与提取的铁染异常吻合度较低,而与羟基异常匹配很好,面状、线状蚀变多分布于满克头鄂博组环形构造内部、多组断裂交汇部位以及夹持区,主干断裂周围。另外,在(花岗)闪长岩区域也提取到大面积羟基异常。结合研究区地质资料,圈定出四处找矿有利地段,指出了下一步工作重点。

Applying the ASTER remote sensing image data to study the extraction information of the iron stain and hydroxyl alteration in the Inner Mongolia Wanheyong volcanic basin,and the result shows that known mineralization points and abnormal points（ belt） match with the extraction of the abnormal iron stain badly,but with hydroxyl anomaly very well. The surface and linear alteration points are mainly located in the interior of the Manketouebo group ring structures,the intersections and clamping area of multiple sets of fractures and the round of the main faults. In addition,we find out that there are extensive hydroxyl anomalies in the（ granite） diorite area.Combining with the geological data in the studied area,we mark out the favorable ore-prospecting sections and point out the focus in the future.