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
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摘要: 提要：（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。Abstract: 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.
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