Magmatic Sequence and Tectonic Setting of Bashierxi Granite in W-Sn Deposit of Baiganhu Area,the Western Sector of Qimantage Mountains

Bashenerxi granites of the western sector of Qimantage mountains consist of two rock types of adamellite and moyite,magmatic sequence includes sixunits from early to late,its age is about 458-432 Ma; tectonic discrimination shows Bashenerxi granites formed in the post-orogenic tectonic setting; through discussions that Ordovician-early Silurian A₂ (PA)-type granite of metaluminous-peraluminous in the south side of Altun fault is the focus of the exploration target of W-Sn deposit in.