Genesis of the Gangcha gold deposit, West Qinling Orogen, China: Constraints from Rb-Sr geochronology, in-situ sulfur isotopes and trace element geochemistry of pyrite

•Polygenetic gold mineralization associated with multiple magmatic-hydrothermal events.•Fluid mixing triggered the precipitation and deposition of ore-forming materials.•Rb-Sr dating of pyrite indicates that the deposit was formed at 225.3 ± 2.6 Ma.•Potential for concealed skarn type Cu-Au and porphyry Cu-Mo-Au deposits.