The ductile compressed zone in Jiaoluotage area in Xinjiang province is developed in Carboniferous volcanic and sedimentary formation striking EW between Tuha and zhongtianshan Landmass.It is comprised of a set of upright penetrative foliations striking EW.Eyeball shaped texture,parallel banding texture and rhombus net-shaped texture are configurations of subzones of the ductile compressed zone in various regions,which are symmetric relative to the main boundary plane of the deformational zone.Many kinds of ductile structural elements such as schistosity,stretching lineation,contemporary folds,boudinges,pressure shadows,deformed pebbles,mortar structures,intragranular foliations,dislocation structures and beltroporic fabrics of optic axis are well developed.All fabrics of these ductile structural elements in different orders and scales are symmetric while schistosity is considered as a symmetry plane.The ductile compressed zone can be transversely divided into three subzones,in which the distribution of deformation metamorphism and stress-strain patterns of rocks is in transversal symmetry.“Cream cake” texture is the characteristic strain texture of the ductile compressed zone.It was formed by NS trending horizontal syntaxial compression caused by the interaction of Tuha Landmass in northern side and middle Tianshan Landmass in southern side between 255Ma and 280Ma in early Permian.As a conclusion,the fabric of the ductile compressed zone in Jiaoluotage area is symmetric,and the flattening is due to deformation mechanism of the ductile deformational zone. The mechanical properties of the ductile compressed zone in Jiaoluotage area indicate that the ductile deformation zone should not be a subduction ductile shear zone between Tarim plate and Junggar plate,its origin may be related to the symmetrily pulling apart and closure of back-arc basin.
Xu Xingwang,Ma Tianlin,Sun Liqian et al. CHARACTERISTICS AND DYNAMIC SIGNIFICANCE OF THE DUCTILE COMPRESSED ZONE IN EASTERN TIANSHAN Mt.IN JIAOLUOTAGE AREA IN XINJIANG PROVINCE[J]. Chinese Journal of Geology, 1998, (2): 147-157.