CASI/SASI data covering the hongliugou hydrothermal metallic deposit, western altyn tagh mining districts, were used to map hydrothermal alteration minerals. The hyperspectral data were calibrated to apparent surface reflectance using the empirical line method and the method of radiative transfer model. The three methods of estimating apparent surface reflectance have been evaluated by using field spectral. Two spectral unmixing algorithms (MTMF and CEM) were applied to analyse imaging spectrometer data. The objective was to compare the performance of the two algorithms, in order to map surface hydrothermal alteration mineralogy in the hongliugou area. Altered rocks and faults in the district can be discriminated by use of mineral distribute images derived from CASI/SASI data.
Hyperspectral remote sensing, featured by integrated images and spectra, is now a frontier of the remote sensing. Using meticulous spectra, hyperspectral remote sensing technology can depict spectral features of objects in detail and are capable of identifying objects rather than simply discriminating them. This study took the Baixianishan region in Gansu Province as an example, and CASI/SASI airborne hyperspectral data were utilized to extract and map alteration minerals by MTMF mapping method. Six hydrothermal alteration minerals were mapped, which contained limonite, sericite and epidote. In addition, we analyzed the types, combinations and distribution of the alteration minerals and divided three stages of hydrothermal activity. It is considered that the favorable ore-forming elements for gold deposits are middle Hercynian porphyraceous granite, fracture and veined distribution of sericite and limonite. The application of CASI/SASI airborne hyperspectral remote sensing data in the Baixianishan area has achieved ideal results, indicative of their wide application potential in the geological research.
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