Geochronological study on Taipinggou molybdenum deposit in Da Hinggan Mountain
大兴安岭太平沟钼矿床成矿年代学研究

The Taipinggou porphyry molybdenum deposit was recently discovered in the Da Hinggan Mountain,China.Our geochronological study of ore-bearing porphyries and orebodies yields a K-feldspar ~(40) Ar-~(39) Ar isochron age of 127.5±4Ma for the ore-bearing,altered adamellite porphyry,a SHRIMP zircon U-Pb age of 131.5±1.1Ma for the ore-bearing granite porphyry,and a molybdeniteRe-Os isoehron age of 129.4±3.9Ma for the orebodies.This suggests that the molybdenum mineralization occurred in a period of 131.5～127.5Ma;and that the porphyries and ore systems formed coevally with the regional Yanshanian tectonomagmatic event in Early Cretaceous.