Age and Tectonic Setting of Tuanjiedaban Intermediate Acid Intrusive Rocks in Western Qiangtang Basin, Tibet

There is great controversy with the closure time of Bangong Lake-Nujiang Tethys Oceanfor a long time. A detailed petrological, geochemical and zircon U-Pb dating of the Tuanjiedaban intermediate acid intrusive rocks in Western Qiangtang Basin have been undertaken in this paper. The results show that the samples of the Tuanjiedaban intermediate acid intrusive rocks are characterized by high silicon (SiO2 is 57.56% -72.35%), rich alkali (K2O + Na2O contents of 5.43% -10.41%), and peraluminous (A / CNK values of 1.0-1.51). The intrusive belongs to high potassium calc alkaline Itype granite.