Tin metallogenesis associated with granitoids in the southwestern Sanjiang Tethyan Domain: Nature, deposit types, and tectonic setting

Tin mineralization in the southwestern Sanjiang Tethys Sn metallogenic domain extends from the Southeast Asia tin belt in the south. The eastern part of the domain does not contain significant Sn deposits, whereas the central part of the domain, composed of the Changning–Menglian Sn belt and related to ca. 239–178 Ma S-type granitoids generated by the collision between Tengchong–Baoshan and Simao Blocks carries widespread the hydrothermal vein type mineralization. The western part of the domain, composed of the Tengchong–Baoshan Sn metallogenic belt, is related to both 136–113 Ma and 89–52 Ma S-type granitoids. The former granitoids resulted from the collision between Western Burma and Tengchong–Baoshan Blocks, and generated skarn-type tin deposits. The younger groups correspond to the India–Asia continental collision and are associated with the Xiaolonghe and Lailishan greisen type Sn deposits.