Geology, fluid inclusions, and H–O–S–Pb isotopes of the Chigou porphyry Cu deposit in Southern Qinling, central China: Implication for ore genesis

•Ore-forming fluids were dominant by magmatic water which were diluted by later meteoric water.•Ore-forming metals were sourced from mantle with minor crustal components.•Decreases in temperature and Oxygen fugacity, and the fluid boiling contributed to precipitation of sulfides.