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The Gangdese magmatic belt,with an average elevation of 6000 m,marks the southern edge of the central Tibetan plateau,extending roughly east-west for～2500 km.It flanks the Tsangpo River to its south,which flows from the west to the east along the Tsangpo suture zone between the Indian and Eurasian plates.Although this belt may therefore contain more information on the interaction between these two plates than any other tectonic element within the Tibetan plateau,questions related to its uplift mechanism and history,as well as its deformation features in response to continental collision have not yet to be explored.