Abstract:

The Wulaxi tungsten deposit is located in the southeastern Songpan-Ganzi orogenic belt. Based on considerable geological
surveys and research, we suggest that this deposit belongs to skarn type tungsten deposit with a medium scale prospect. In this contribu?
tion, Re-Os dating has been determined for the molybdenites from the Wulaxi tungsten deposit, which occurred as quartz veins and were
spatially related to the scheelites. The analytical results yield model ages ranging from 161.5±2.2 to 165.3±2.2 Ma with a weighted mean
age of 163.7±1.9 Ma (n=6, MSWD=0.42, 95% conf.), and a good isochron age of 161.0±3.7 Ma (n=6, MSWD=0.87, 2σ). The Re-Os geo?
chronological signals show that the W-Mo mineralization occurred in the late stage of Middle Jurassic, slightly post-dated the formation
of ore-bearing granite, indicating that it might be a product of the Yanshanion tectonic-magmatic-hydrothermal event in the region. The
ore-forming source was possibly derived from the Proterozoic Liwu Group complex. In addition, there is favorable potential for ore pros?
pecting at greater depths.

Key words: molybdenite, Re-Os dating, geological features, Wulaxi tungsten deposit, Western Sichuan