摘要:
西天山是“丝绸之路经济带”和“亚洲金腰带”的核心区和重要组成部分,世界级的穆龙套金矿床是西天山成矿带内最重要的金矿床之一。作者将前人成果与自身研究结果结合,形成该篇以穆龙套地区为例的基于ASTER数据的遥感蚀变信息提取的论文。含碳质细碎屑岩是穆龙套地区的溶矿岩层,矿体受韧性-韧脆性断裂系统的严格控制。穆龙套地区热液蚀变类型丰富,黑云母化、硅化、钠长石化、绿泥石化、绿帘石化、碳酸盐化等蚀变信息与金矿化关系极为密切,且ASTER数据VNIR-TIR波段可提取多种蚀变矿物信息,本文使用ASTER数据,对穆龙套金矿床及其外围地区开展遥感蚀变异常提取:利用波段比值法、矿物指数法提取硅化蚀变,利用主成分分析法提取Mg-OH、铁染和碳酸盐化蚀变信息。最后基于ArcGIS平台,将提取出的遥感异常信息、搜集到的已知矿点及重砂异常叠加分析,结果表明遥感异常密集区与已知矿点吻合度较高,这对研究及寻找同类型矿床有一定的参考价值。
Abstract:
West Tianshan is the core area and an important part of "Silk Road Economic Belt" and "Asian Gold Belt". The world-class Muruntau gold deposit is one of the most important gold deposits in the West Tianshan metallogenic belt. The authors combined the previous achievements with his own research results to form this paper on remote sensing alteration information extraction based on ASTER data, with Muruntau area of West Tianshan Mountains as an example. Carbonaceous fine clastic rock is the ore soluble stratum in Muruntau area.The orebody is strictly controlled by the ductile-ductile brittle fracture system. Hydrothermal alteration types in Muruntau area are rich in biotite, silicification, albitization, chloritization, epidotization, carbonation and other alteration information, which is closely related to gold mineralization. Moreover, a variety of alteration mineral information can be extracted from the ASTER data in VNIR-TIR band. Remote sensing extraction of alteration anomalies in the Muruntau gold deposit and its peripheral areas was carried out: the silicified alteration was extracted by band ratio method and mineral index method, and the alteration information of Mg-OH, iron staining and carbonation was extracted by principal component analysis method. Finally, on the basis of the ArcGIS platform, the extracted remote sensing anomaly information, the collected known ore spots and the heavy sand anomaly were superimposed upon each other and analyzed. The results show that the remote sensing anomaly intensive area has a high coincidence degree with the known ore spots, which has a certain reference value for the study and search of the same type of deposits.
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