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Miocene post-collisional ultrapotassic rocks in the southern and central parts of the Lhasa Terrane of southern Tibet provide an opportunity to explore the deep processes and lithospheric evolution of the Tibetan Plateau.The magmatic source of the ultrapotassic rocks is still debated.However,the source can be identifiedusing the Re–Os isotopic system.In this paper,we provide comprehensive data on the Re–Os isotopic compositions of ultrapotassic rocks from Mibale and Maiga areas in southern Tibet,and we refine the age of the Mibale ultrapotassic rocks to 12.5 Ma.