Hydrothermal alteration mapping using ASTER data in Baogutu porphyry deposit, China

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Li, Q.^1 ; Zhang, B.^1 ; Lu, L.^1 ; Lin, Q.^1

Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, China^1

关键词: Absorption features;    Advanced spaceborne thermal emission and reflection radiometer;    Classification results;    Constrained Energy Minimization;    Hydrothermal alterations;    Mineral assemblage;    Minimum noise fraction;    Porphyry copper deposits;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012174/pdf
DOI  :  10.1088/1755-1315/17/1/012174

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Remote sensing plays an important role in mineral exploration. One of its proven applications is extracting host-rock lithology and alteration zones that are related to porphyry copper deposits. An Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) was used to map the Baogutu porphyry deposit alteration area. A circular alteration mineral zoning pattern was clearly observed in the classification result of potassic, phyllic, argillic, propylitic zones. The potassic is characterized by biotite and anhydrite with an absorption feature centered at 1.94 and 2.1um. The phyllic zone is characterized by illite and sericite that indicates an intense Al-OH absorption feature centered at 2.20um. The narrower argillic zone including kaolinite and alunite displays a secondary Al-OH absorption feature at 2.17 um. The mineral assemblages of the outer propylitic zone are epidote, chlorite and calcite that exhibit absorption features at 2.335um.The performance of Principal Component Analysis(PCA), Minimum Noise Fraction (MNF), band ratio(BR) and Constrained Energy Minimization(CEM) has been evaluated. These techniques identified new prospects of porphyry copper mineralization in the study areas. These results indicate that ASTER is a powerful tool in the initial steps of mineral exploration.