PAN style="FONT-FAMILY: ’Times New Roman’,’serif’" lang=EN-US>A whole-rock 40Ar-39Ar age of (0.81±0.21) Ma was obtained for the North Pulu potassic volcanic rocks in the northwestern margin of Tibetan Plateau. The rocks belong to shoshonite series and are mainly composed of shoshonite and trachyandesite. The North Pulu potassic volcanic rocks might have been the product that responded to the delamination of the mantle lithosphere beneath the northwestern margin of the Tibetan Plateau during the Late Cenozoic continent-continent collision orogeny.