Abstract:

 The Wangwu Mo-Cu deposit is one that has been explorating and has the potential of large or super-large scale in recent years in North Wuyi region. Based on the study of geological feature, with LA-ICP-MS zircon U-Pb dating, the granophyre vein weighted mean age is (127.5±1.8) Ma(MSWD=1.4).It is shown that the deposit formed in Early Cretaceous Epoch. Using molybdenite Re-Os dating, the isochron age is (153.7±3.2) Ma(MSWD=3.9). It indicates that metallogenesis of Mo occurred in Late Jurassic Epoch. The diagenesis age of granophyre vein is much later than that of Mo deposit, which shows that there is no relationship between them. Comparing the neighbor deposit mineralization feature and analyzing the existed information, it infers that the rock of molybdenum is acidic granite porphyry or biotite granite, which is located in the deep area of southeastern part of the ore district. The major metallogenesis age of Mo is Early-Late Jurassic Epoch (155 Ma±) and Early Cretaceous Epoch(135 Ma±) in North Wuyi area. During this period, the formation of Mo and Cu deposits are related to magmation caused by paleopacific plate subducting.

Key words: Re-Os dating, zircon U-Pb dating, molybdenite, granophyre, Wangwu, North Wuyi region