Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Selected end-member minerals (within the mapped hydrothermally altered zones) and USGS spectra matching scores computed using the SAM method and geographic coordinates
| Mineral | Score (%) | Geographical coordinates |
|---|---|---|
| Alunite | 81.6 | 29°51'3.56"N, 9°1'16.63"W |
| Calcite | 90.3 | 29°52'17.62"N, 9°0'13.03"W |
| Chlorite | 73.3 | 29°50'20.48"N, 9°4'16.54"W |
| Epidote | 80.2 | 29°49'18.45"N, 9°2'51.28"W |
| Illite | 89.3 | 29°54'35.83"N, 8°59'56.01"W |
| Kaolinite | 91.1 | 29°49'18.45"N, 9°2'51.28"W |
| Montmorillonite | 90.1 | 29°54'35.83"N, 8°59'56.01"W |
| Muscovite | 84.6 | 29°50'48.65"N, 9°2'38.17"W |
| Pyrophyllite | 74.1 | 29°51'7.29"N, 9°1'12.16"W |
Landsat-8 OLI data characteristics
| Bands | Wavelengths (μm) | Spatial resolution (m) |
|---|---|---|
| Band 1-coastal/aerosol | 0.43–0.45 | 30 |
| Band 2-Blue | 0.45–0.51 | 30 |
| Band 3-Green | 0.53–0.59 | 30 |
| Band 4-Red | 0.64–0.67 | 15 |
| Band 5-NIR | 0.85–0.88 | 30 |
| Band 6-SWIR 1 | 1.57–1.65 | 30 |
| Band 7-SWIR 2 | 2.11–2.29 | 30 |
| Band 8-Panchromatic | 0.50–0.68 | 15 |
| Band 9-Cirrus | 1.36–1.38 | 30 |
PCA eigenvector matrix of OLI bands
| Eigenvectors | Eigenvalues (%) | Band 1 | Band 2 | Band 3 | Band 4 | Band 5 | Band 6 | Band 7 |
|---|---|---|---|---|---|---|---|---|
| PC 1 | 94.505 | -0.09192 | -0.12474 | -0.2078 | -0.33462 | -0.48452 | -0.60072 | -0.47457 |
| PC 2 | 3.398 | 0.000397 | -0.00519 | 0.024592 | -0.13446 | 0.842454 | -0.25154 | -0.45639 |
| PC 3 | 1.620 | 0.222355 | 0.292138 | 0.389118 | 0.690656 | -0.08932 | -0.46946 | -0.09177 |
| PC 4 | 0.279 | -0.12715 | -0.17061 | -0.22221 | -0.03729 | 0.213198 | -0.58625 | 0.717502 |
| PC 5 | 0.176 | 0.519782 | 0.523961 | 0.26547 | -0.58028 | -0.01976 | -0.096 | 0.196193 |
| PC 6 | 0.018 | -0.44877 | -0.26373 | 0.815732 | -0.2339 | -0.04026 | -0.05046 | 0.068967 |
| PC 7 | 0.003 | -0.67407 | 0.72517 | -0.13975 | -0.01132 | 0.00846 | -0.00293 | 0.004203 |
Terra ASTER data characteristics
| Bands | Covered Spectrum | Wavelengths (μm) | Resolution (m) |
|---|---|---|---|
| 1 | VNIR | 0.520–0.600 | 15 |
| 2 | VNIR | 0.630–0.690 | 15 |
| 3N | VNIR | 0.760–0.860 | 15 |
| 3B | VNIR | 0.760–0.860 | 15 |
| 4 | SWIR | 1.600–1.700 | 30 |
| 5 | SWIR | 2.145–2.185 | 30 |
| 6 | SWIR | 2.185–2.225 | 30 |
| 7 | SWIR | 2.235–2.285 | 30 |
| 8 | SWIR | 2.295–2.365 | 30 |
| 9 | SWIR | 2.365–2.430 | 30 |
| 10 | TIR | 8.125–8.475 | 90 |
| 11 | TIR | 8.475–8.825 | 90 |
| 12 | TIR | 8.925–9.275 | 90 |
| 13 | TIR | 10.25–10.95 | 90 |
| 14 | TIR | 10.95–11.65 | 90 |
PCA eigenvector matrix of ASTER bands
| Eigenvectors | Eigenvalues (%) | Band 1 | Band 2 | Band 3 | Band 4 | Band 5 | Band 6 | Band 7 | Band 8 | Band 9 |
|---|---|---|---|---|---|---|---|---|---|---|
| PC 1 | 83.49 | -0.2073 | -0.3643 | -0.3000 | -0.4017 | -0.3157 | -0.3159 | -0.3434 | -0.3354 | -0.3779 |
| PC 2 | 8.61 | 0.3157 | 0.3620 | 0.6760 | 0.0359 | -0.1632 | -0.2192 | -0.2168 | -0.2680 | -0.3425 |
| PC 3 | 3.95 | -0.3816 | -0.5550 | 0.3412 | 0.5935 | 0.1125 | 0.0629 | 0.0189 | -0.1203 | -0.2144 |
| PC 4 | 2.31 | 0.2198 | 0.2946 | -0.5600 | 0.5047 | 0.1437 | -0.0375 | 0.0426 | -0.1342 | -0.5046 |
| PC 5 | 0.54 | 0.2128 | -0.1446 | 0.0484 | -0.2907 | 0.2730 | 0.7915 | -0.1968 | -0.1344 | -0.2983 |
| PC 6 | 0.4 | 0.1262 | -0.2003 | 0.1268 | -0.2920 | 0.1665 | -0.2261 | 0.5204 | 0.4782 | -0.5139 |
| PC 7 | 0.34 | -0.7725 | 0.5273 | 0.0629 | -0.1636 | 0.0905 | 0.1434 | 0.1037 | -0.0191 | -0.2333 |
| PC 8 | 0.20 | 0.0066 | -0.0244 | 0.0206 | -0.1657 | 0.8205 | -0.3631 | -0.0296 | -0.3749 | 0.1572 |
| PC 9 | 0.15 | -0.0722 | 0.0395 | 0.0020 | 0.0785 | 0.2378 | -0.1289 | -0.7152 | 0.6287 | -0.0825 |