中天山东部南北两缘韧性剪切带变形特征

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

(1)中天山北缘韧性剪切带除右旋韧剪变形之外,还发育相对较弱的左旋韧剪变形,局部残留加里东晚期的逆冲推覆韧剪变形;右旋韧剪变形的变形温度环境为中-低温,左旋韧剪变形的变形温度环境为高温、中温、中低温及低温。(2)中天山南缘韧性剪切带以右旋韧剪变形为主,兼具左旋韧剪变形;右旋韧剪变形的变形温度环境为中温、中低温、低温,左旋韧剪变形的变形温度环境为高温、中温、中低温及低温。(3)东天山存在一系列右旋韧性剪切带,中天山南北两缘韧性剪切带的构造变形与辛格尔断裂、兴地断裂等右旋韧性剪切带的变形以及塔里木北缘东部晚震旦—早古生代地层的同劈理褶皱变形、南天山泥盆纪地层的变形可能具成因联系。

（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.