Deformational characteristics of ductile shear zones in northern and southern margins of eastern central Tianshan

Abstract：(1) There exists relatively weak left-lateral ductile-shear deformation in addition to right-lateral ductile-shear deformation in the northern Central Tianshan ductile shear zone, with local remnant late Caledonian thrust nappe ductile-shear deformation; the temperature environment of the right-lateral ductile-shear deformation is medium-low temperature, while the temperature environment of the left-lateral ductile-shear deformation is high, medium, medium-low and low temperature. (2) The southern Central Tianshan shear zone is dominated by right-lateral ductile-shear deformation together with some left-lateral ductile-shear deformation; the temperature environment of the right-lateral deformation is medium, medium-low and low temperature, whereas that of the left-lateral ductile-shear deformation is high, medium, medium-low and low temperature. (3) There exist a series of right-lateral ductile shear zones in eastern Tianshan Mountaions, and the tectonic deformations in northern and southern margins of central Tianshan Mountains might be genetically related to the deformation of such right-lateral ductile shear zones as Xingeer fault and Xingdi fault, the deformation of late Sinian-early Paleozoic syn-cleavage folded deformation in the eastern part of northern Tarim basin and the deformation of Devonian strata in southern Tianshan Mountains.