Figure 8

Laboratory-measured reflectance spectra of 5 altered samples in the study area.
O44, weak altered wall rock (tuffaceous siltstone); X821-G1G1, greyish-green granite porphyry with weak sericitization, chloritization and silicification; X821-G2G2, dark granite porphyry with weak sericitization, chloritization and silicification; X818-TQ161, wall rock with moderate silicification, chloritization, sericitization and epidotization; X818-TQ72, strong silicification, chloritization and sericitization near the quartz vein.