Fluid Evolution of Fuzishan Skarn Cu-Mo Deposit from the Edong District in the Middle-Lower Yangtze River Metallogenic Belt of China: Evidence from Petrography, Mineral Assemblages, and Fluid Inclusions

Figure 14

Fluid evolution paths of the Fuzishan Cu-Mo deposit (NaCl-H₂O system) (modified after Meinert et al. [3]; Peng et al. [48]; Shu et al. [62]). The two paths show that separated two-phase (vapor and hypersaline) fluids come from the initial supercritical fluid with salinity of 6 to 8 wt.% NaCl equivalent. The blue path indicates that the trajectory hits the solvus at 550 to about 650°C and at a pressure of 700 to 1000 bars (equal to lithostatic depth of 2.6 to 3.7 km) in the prograde skarn stage. The green path indicates that the trajectory hits solvus around 350 to 400°C and at pressure of 150 to 280 bars (equal to hydrostatic depth of 1.5 to 2.8 km) both in retrograde skarn and quartz-sulfide stages. See more details in the text.