利用热红外遥感提取层状硅酸盐蚀变矿物信息研究——以甘肃北山地区为例

Application of Thermal Infrared Remote Sensing in the Extraction of Altered Phyllosilicate Minerals:Example from Beishan Area of Gansu Province

矿物亚类的光谱曲线特征具有较大相似性,对层状硅酸盐矿物使用传统的可见光-近红外遥感中的区分提取难度较大。笔者以甘肃北山柳园工作区为例,利用发射率光谱特征,进行了层状硅酸盐蚀变矿物提取实验。通过与ASU光谱库标准光谱曲线进行对比,分析了来自于图像端元的光谱曲线特征,区分出了层状硅酸盐矿物如蛇纹石、绿泥石等。野外实地验证结果表明,该方法在信息提取方面精确度较高,遥感应用效果更加定量化、精确化,对于遥感地质填图工作具有很大的意义。

With respect to the high similitude in spectrum of minerals＇ subclasses, it will be a challenge for applying visible and near-infrared method to extract the phyllo-silicate minerals. Take the Liuyuan in Gansu province as an example, through corresponding with the ASU Spec- tral Library, the spectral curve features of the images endmember have been analyzed, the phyl- losilicate alternated minerals （like Serpentine and Chlorite） have been identified on the basis of the curve features in spectrum of emissivity, and the mapping of alteration has been completed successfully. The results of field study show that, this method demonstrates high accuracy in terms of extraction and quantifies the effect of remote sensing in a more efficient way, which has an important significant for the mapping works of geological remote sensing.