5
Figure 4. The technical process framework of this study
Table 2. Hydrothermal alteration mineral indices (Ninomiya,
2003)
Ninomiya Index Index Spectral Formula
Index of altered minerals OHIa
)Band6
Band7
Band6
Band4
Pyrophyllite mineral
index
OHIb
)Band5
Band7
Band5
Band4
Kaolinite Index KLI
)Band5
Band4
Band6
Band8
Alunite Index ALI
)Band5
Band7
Band8
Band7
Calcite Index CLI
)Band8
Band6
Band8
Band9