Metallogenic epoch and genetic study of the Tianziping gold deposit, West Qinling orogenic belt

The Tianziping gold deposit in West Qinling orogenic belt is an altered rock type gold deposit with gold-bearing quartz veinlets and quartz stockworks.The authors selected hydrothermal zircon in the gold-bearing quartz vein for metallogenic epoch research.Some of the zircons were corroded with no rings or weak rings.These zircons also have high Th, U, Pb content and Th/U ratios, indicating that these zircons are hydrothermal zircons.LA-ICP-MS U-Pb analysis of these zircons yielded a concordant age of 110±7 Ma, which is contemporaneous with the continental napping event in this area in late Early Cretaceous, which should be an important metallogenic epoch of the gold deposit.The authors hold that a tectonic altered rock type gold mineralization occurred in Late Yanshanian period in the Chaijiazhuang gold concentration area, which was related to the contemporaneous large-scale tectonic movement.