西天山造山带的构造变形特征研究

西天山造山带由伊犁中天山北缘－北天山推覆走滑系统、伊犁中天山南缘－南天山推覆走滑系统和两者之间的伊犁地块组成。伊犁中天山北缘－北天山推覆走滑系统包括北天山推覆构造带、伊犁中天山北缘逆冲带和中天山北缘断裂带。伊犁中天山南缘－南天山推覆系统包括中天山南缘逆冲带、南天山北坡增生楔推覆席、南天山北坡早古生代被动陆缘推覆席、南天山南坡晚古生代洋壳－火山弧－复理石复合推覆席、中天山南缘断裂带和南天山南坡断裂带。区域构造和变形构造的研究表明西天山推覆构造主要奠定于早二叠世早期，走滑运动发生于晚二叠世－早三叠世。中新生代，沿古生代构造有进一步的推覆和走滑运动发生

Studies on the Features of the Structural Deformationsin the Western Tianshan Orogenic Belt

The western Tianshan orogenic belt consists of the napping strike slipping system in the north margin of the Yili central Tianshan and the north Tianshan (MCNT), in the south margin of the Yili central Tianshan and the south Tianshan (MCST) and the Yili block between them. The MCNT includes the north Tianshan napping belt, the overthrusting zone in the north margin of the Yili central Tianshan and the North Central Tianshan fault zone. The MCST includes the overthrusting zone in the south margin of the Yili central Tianshan, the accretionary napping sheet in the north slope of the south Tianshan, the Early Paleozoic passive continental margin napping sheet in the north slope of the south Tianshan, the Late Paleozoic oceanic volcanic flysch composite napping sheet in the south slope of the south Tianshan, the South Central Tianshan fault zone and the South Tianshan fault zone. Based on the regional tectonics and deformational structures, it could be confirmed that the napping tectonics of the western Tianshan orogenic belt might be predominantly established in the early time of Early Permian and the strike slip movement might occur during Late Permian through Early Triassic. Successive napping and strike slip movement may happen along the Paleozoic tectonics during Meso Cenozoic times.