Fig. 4: The phase diagrams of H2O-NaCl and H2O-NaCl-CO2, extracted efficiency of Mo from exsolved fluid and schematic diagrams of the formation of Dabie-type porphyry molybdenum deposits.
From: The role of CO2 in the genesis of Dabie-type porphyry molybdenum deposits
a A pressure-salinity diagram showing phase relationships in the systems H2O-NaCl, and H2O-NaCl-CO2 calculated from Driesner and Heinrich43 and Duan et al.44, respectively. b The extraction efficiency ratio of molybdenum, defined as the mass of Mo in the exsolved fluid phase divided by the mass of Mo in the initial magma, versus the ratio of exsolved fluid to magma. The DMofluid/melt values obtained from our experiments were used to calculate the extraction efficiency. The blue line represents the extracted efficiency of Mo from initial magma when XCO2 = 0.1, and 0.3, respectively. The Black dashed line represents the extracted efficiency calculated for the peraluminous system. The red line represents the extracted efficiency in H2O-NaCl supercritical fluid. Details of the calculation are provided in the supplemental materials. c The schematic diagram illustrated the post-collisional extensional environment45 of Dabie-type or Collision-type porphyry molybdenum deposits. d The diagram shows the fluid evolution mole for Dabie-type porphyry molybdenum deposits, featuring immiscible vapor and brine CO2 bearing ore-forming fluids that directly exsolve from felsic magma.
