SIMS U-Pb zircon geochronological and geochemical study of the Sn deposits in Tengchong, north of the Southeast Asian metallogenic belt: Implications for the timing of mineralization and ore genesis

•The Xiaolonghe and Lailishan Sn deposits formed during 75–76 Ma and 50–51 Ma.•Both ore-related granites are silica and alkali rich, peraluminous and highly differentiated.•The Xiaolonghe granite was derived from the ancient lower crust.•The Lailishan granite originated from the ancient lower crust, with minor mantle materials.•Sn mineralization was associated with collision-related setting.