高光谱遥感异常提取在甘肃北山金滩子-明金沟地区成矿预测中的应用

摘要

Using airborne hyperspectral remote sensing (CASI/SASI) data, the abnormal information of the altered minerals of the Jintanzi-mingjingou area of the Beishan metallogenic belt in Gansu was extracted and analyzed. The distribution and formation of altered minerals were summarized. Combined with the typical rock and mineral results by ASD ground spectral measurements, we analyzed the spectral curve characteristics of different geological alteration minerals. On the basis of comprehensive analyzing of metallogenic geological conditions of gold deposits in the Beishan minerogenetic belt, geological sections for altered minerals were carried out using spectral measurements. Prospecting models by hyperspectral remote sensing were established on the basis of the gold deposits in this region. According to the geological background and geochemical anomaly characteristics, the application of hyperspectral anomaly in metallogenic prediction was discussed. The geological information showed that the targeted hyperspectral anomaly regions are potential for Au mineralization, which can be concluded that hyperspectral remote sensing can provide precise and reliable information for mineral exploration.%利用机载高光谱遥感数据(CASI/SASI)，对甘肃北山成矿带金滩子-明金沟一带的蚀变矿物异常信息进行提取和分析，总结了区内蚀变矿物异常信息的分布规律及成因；结合典型岩石、矿物 ASD 地面光谱测量，对不同地质体中蚀变矿物的光谱曲线特征进行分析、总结；选取研究区北部明金沟金矿床的矿化蚀变地质剖面开展光谱测量，结合成矿地质条件分析，建立基于区内金矿床的高光谱遥感找矿模型。以找矿模型为指导，综合成矿地质背景及地球化学异常特征，筛选出成矿有利区段，进而通过野外查证检验高光谱异常信息在成矿预测中的应用效果。野外查证表明圈定出的找矿预测区金矿化发育，成矿潜力较好，说明高光谱遥感能为找矿提供较为准确且可靠的信息。