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The Chaiwopu Basin is situated in the easternmost part of the northern Chinese Tian Shan foreland.Geomorphologically and tectonically,the basin lies in the transitional zone of the eastern Tian Shan(Bogda Shan and Balikun Shan)and the western Tian Shan: diffuse N-S boundary which generally lies near the city of Urumqi.Given its position atride this transition,the Chaiwopu Basin is thus a key area to understand the late Cenozoic deformation of the Tian Shan.