Abstract:

The Taipinggou porphyrytype molybdenum deposit in Inner Mongolia is located in the north of the well-known Da Hinggan Ling metallogenic belt in China. It lies in the superimposed part of the circum Pacific metallogenic province and the Paleo-Asian Oceanic metallogenic province. Re-Os dating of molybdenite from the Taipinggou porphyry-type deposit gives an isochron age of (130.1±1.3)Ma, and the ore-forming epoch belongs to the Yanshanian mineralization episodes. The Taipinggou molybdenum deposit is formed by the eastern China magmatic activities in late Mesozoic. The metallogenic geodynamics of the deposit is viewed that the lithosphere of east China is under the environment of lithospheric extension and thinning. The Re contents of the Taipinggou molybdenum deposit range from (9.9±0.085)×10^-6  to (69.185±0.616)×10^-6 , which equals to the Re contents of crust-mantle magmatic mixing. It also identifies that the sources of ore-forming materials come from the deep mixing of crust and mantle.

Key words: porphyry molybdenum deposit, Re-Os isotopic dating, Taipinggou, Inner Mongolia