The Qiyugou Au orefield - An intrusion-related gold system in the Eastern Qinling ore belt, China: Constraints from SIMS zircon U-Pb, molybdenite Re-Os, sericite Ar-40-Ar-39 geochronology, in-situ S-Pb isotopes, and mineralogy

•The Qiyugou Au orefield developed three magmatic events.•The Qiyugou Au orefield developed three types of Au mineralization.•Three types of Au mineralization are genetically related to the ca. 131 Ma hornblende monzogranite.•Three types of Au mineralization constitute an intrusion-related gold system.