基于 ASTER 数据的江拉昂宗铜多金属矿床矿化蚀变信息提取与分析

摘要

Study area is Jiangla ’ angzongskarn type copper polymetallie deposit in this paper , it lies to the middle of Gangdesemetallo-genic belt in Tibet.Based on the advantages of ASTER's multi bands remote sensing data ,we use bands ratio to distil marbleization , epidotization and diopside to petrochemical from this deposit .On this basis, we comprehend the alteration information how to influence the mineralization , on the other hand , that raised up the alteration information of the Remote sensing's identification accuracy .This method is powerful to application , which reflected fullest to this deposit's and its perpheral's recognition rules , and provided a reliable basis for Jiangla ’ angzong's periphery prospecting .%以西藏冈底斯成矿带中段江拉昂宗矽卡岩型铜多金属矿床作为研究区，基于ASTER遥感数据的多波段优势，应用比值法，对该矿区进行大理岩化、绿帘石化和透辉石化矿化信息的蚀变提取。在此基础上，建立蚀变对于成矿影响程度的判断，提高了遥感矿化蚀变信息识别精度。此方法应用性强，充分体现了此矿区及其外围蚀变规律，为江拉昂宗外围找矿提供了可靠依据。