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1. ObjectivernThe surface uplift history of the Tibetan Plateau is a hot topic in geosciences. The evidence from stratigraphy, geochronology of potassium-rich lava and studies of apatite fission tracks indicated that the Lhasa and southern Qiangtang terranes were at or close to their modern elevation since 40 Ma and formed the proto-Tibetan Plateau (Wang CS et al., 2008).