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 40Ar-39Ar geochronology, in-situ S-Pb isotopes, and mineralogy

The Eastern Qinling ore belt is the second largest Au province in China and is estimated to contain more than 1300 metric tons of Au. Most of the gold deposits in the belt are vein-type (fracture-hosted Au). Whether they are of metamorphic origin or magmatic-hydrothermal origin is controversial. The Qiyugou Au orefield developed granite-hosted Au, breccia pipe-hosted Au, and fracture-hosted Au, and the present study investigates these three...