| 基于ASTER数据的遥感蚀变信息提取——以西天山穆龙套地区为例 |
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| 关键词:ASTER Muruntau alteration information Principal Component Analysis (PCA) |
| 基金项目:中国科学院战略性先导科技专项(A类)“泛第三极环境变化与绿色丝绸之路建设”子课题“矿产资源分布及其潜力评估”项目(编号: XDA20070304) |
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| The Extraction of Remote Sensing Alteration Information Based on ASTER Data: A Case Study of Muruntau Area in Western Tianshan Mountains |
| 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. |
| Rufeina ALIMUJIANG,CHEN Chuan,GAO Ling-ling,LI Shun-da.2022.The Extraction of Remote Sensing Alteration Information Based on ASTER Data: A Case Study of Muruntau Area in Western Tianshan Mountains[J].Acta Geoscientica Sinica,43(2):235-245. |
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