宁夏区地质构造与围岩蚀变遥感信息提取

为了对宁夏回族自治区(以下简称为宁夏区)矿产资源潜力进行评价,以ETM+遥感数据为基础信息源,首先采用人工目视解译和计算机自动提取方法提取了宁夏区线性、环形构造信息;然后应用主成分分析和光谱角法提取了铁染和羟基蚀变异常信息;最后,结合区域地质构造条件,综合分析总结了宁夏区线性、环形构造特征和蚀变异常的分布特征及其示矿意义。研究结果表明:提取的区域线性构造与宁夏区地质研究确立的区域构造格架展布形态基本吻合;在卫宁北山、贺兰山北段等重点找矿远景区,构造和蚀变异常信息是矿产资源潜力评价的主要要素。根据提取的构造和蚀变异常信息圈定的找矿靶区(或称遥感最小预测区),为在以上地区开展矿产资源勘查和潜力评价提供了参考依据,并在局部地段得到了勘探结果验证。

The Extraction of Fault Structure and Wall Rock Alteration Remote Sensing Information in Ningxia

In order to evaluate mineral resources in Ningxia,the authors used ETM+ satellite remote sensing data to extract linear and circular structure information of Ningxia by means of manual visual interpretation and computerization.At the same time,information of iron and hydroxide radical anomalies was collected by the principal components analysis and spectral-angle mapper.In combination with regional geological structure conditions,the authors made an integrated analysis of remote sensing linear character,circular structure and distribution characteristics and anomaly information in Ningxia and its indicative significance for mineral resources.The results show that remote sensing linear structure is almost identical with regional structure distribution of Ningxia,and the remote sensing linear structure and anomaly information can be employed to act as the main forecast factors for mineral resource potential evaluation in Weining North Mountain and Helan Mountain.The identified prospecting targets have provided an ideal indicative reference for mineral exploration,and some targets has already been verified by exploration results.