Geochronological Study On Taipinggou Molybdenum Deposit In Da Hinggan Mountain.

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 +/- 1.1 Ma for the ore-bearing granite porphyry, and a molybdeniteRe-Os isochron age of 129.4 +/- 3.9Ma for the orebodies. This suggests that the molybdenum mineralization occurred in a period of 131.5 similar to 127.5Ma; and that the porphyries and ore systems formed coevally with the regional Yanshanian tectonomagmatic event in Early Cretaceous.