Formation and evolution of multistage magmatic-hydrothermal fluids at the Yulong porphyry Cu-Mo deposit, eastern Tibet: Insights from LA-ICP-MS analysis of fluid inclusions

The high Cs + Rb ± B concentrations of melt and fluid inclusions in sulfur-rich magmatic apatite (0.3-1.4 wt% SO3) suggest a pegmatitic environment for the exsolution of the fluids. The similar element/K ratios of liquid-rich inclusions in the late-stage pyrite-quartz veins to the fluid inclusions in the sulfur-rich apatite suggest that the late-stage fluids were also likely derived from highly evolved melt fractions in felsic magmas during the solidification of the magma chamber.