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Hydrothermal activities and related antimony mineralization in Shalagang mine of southern Tibet

Shalagang mine, the largest antimony deposit in southern Tibet, is located in the west of Longma Town, Jiangzi County, to the east is the anticlinorium of Jiangzi basin. The exposed strata in the mine area are the Upper Cretaceous Zongzhuo Formation (a set of sedimentary chaotic melange) and the Lower Cretaceous Duojiu Group which is widely spread in the study area and mainly consist of deep marine basin sedimentation (Zhang et al., 2011).The ore country rocks are siliceous rocks, carbonaceous slate as well as altered diabase. Siliceous rocks, with black and gray black colors, contain essentially aphanitic quartz (>80%), argilloid, carbon, and iron materials, and develop aphanitic, particulate, phyric crystal, massive and brecciated structures. Due to the complex mineralization mechanism of the deposit and lack of further geological work, there exist several kinds of understanding the mineralization process of Shalagang antimony, such as, the mineralization of composite SEDEX deposit (Li, et al.,2001; Qi, et al., 2008), the low temperature hydrothermal mineralization (Sun, et al., 2014) and the magmatic hydrothermal mineralization related to the activity of alkaline granite (Nie et al., 2005). The author, in this study, argue that the hydrothermal activities play an important role in the mineralization process of antimony deposit based on the field investigation and the laboratory geochemistry analysis. *