Abstract: There exists a ductile shear zone in the Paikuco region in the Lhagoi Kangri tectonic zone, where at least three stages of deformation are recognized, including Stage 1, which may be related to the concentration of strain energy in the Kungmu ductile shear zone and associated with the formation of calcite veins and partial melting; Stage 2, during which the overthrusting southwards may result in the formation of imbricated overthrust sheets, associated with the deformation of the calcite veins and magmatism, and Stage 3, during which N-S-trending extension and collapse of the shear zone occurs as part of the South Tibet Detachment System.