The segmentation and the relationship between shallow anddeep structures of Bogda Mountain,Xinjiang, Northwest China

Study shows that the Tianshan Mountains and its vicinity have undergone thermal attenuation since the Mesozoic; that the re-orogeny in Bogda Mountain in the Cenozoic has the characteristics of cold uplifting; and that most of faults along the boundaries between basin and mountain are limited in the upper crust, and are not the “deep and large faults” which could go downwards to the middle crust or upper mantle. The ductile shear zone in the orogenic belt was formed during the Late Paleozoic and was not the fault formed in the period of re-orogeny, which have nothing to do with the basin-mountain coupling and the uplifting of the mountain; the uplifting of the Bogda Mountain is resulting from the anticlinorium formation of strata. The relationship between the Bogda Mountain and the eastern Junggar basin and Tu-Ha basin is that of a bending structure consisting of one limb of anticline and the basement of basin rather than that of faulted blocks bounded by deep and large faults. The Bogda Mountain shows the characteristics of segmentation horizontally, and of forming of the eastern Junggar Basin to the north of the mountain and Tu-Ha foreland basins to the south, which leading to the formation of the special tectonic style of rhombic symmetry.Directed by the slab tectonics and based on the study of the relationship between deep and shallow structures and horizontal relationship between basin and mountain, the authors discuss the kinematical and geometrical segmentation of the Bogda Mountain during the intraplate orogeny and establish the basin-mountain coupling model of this region.