中国西天山南缘盆山构造转换解析

ON OROGENIC TO BASINAL TECTONIC TRANSFER ALONG THE SOUTHERN MARGIN OF WEST TIANSHAN MOUNTAINS, CHINA

在西天山南缘，天山造山带向塔里木盆地北缘的盆山过渡，是以前陆褶皱冲断构造形式向库车一拜城前陆盆地渐变，表现为一系列褶皱冲断组合的构造样式。根据独库公路南段构造变形分析，可组合成６个部分：库尔千一铁力买提达坂根带褶皱系、南天山南缘逆冲断裂带、前陆逆冲推覆构造带、前陆双冲褶皱构造带、前陆隐伏逆冲前缘构造带、沙雅一轮台前缘叠加变形构造带。前陆盆地的发展可以划分为晚二叠一早三叠世、中三叠世—株罗纪、白垩—古近纪和新近纪以来４个阶段，其中晚二叠世、晚三叠世和侏罗纪，盆地演化在造山带有较为明显的构造响应。

The Tianshan Orogen was gradually transferred to Kuqa-Baicheng foreland basin along the northern margin of Tarim basin at the sourthern part of West Tianshan mountains. The transfer was completed through folding and thrusting of foreland. A series of fold-and-thrust systems formed, including Kuergan- Tielimeti root fold system, South Tianshan southern margin thrusted fault system, foreland thrusted nappe system, foreland double thrust fold belt, foreland blind thrust front marginal belt, and Shaya-Luntai front marginal overlapping deformation belt. The development of foreland basin covered four stages, that is, late Permianearly Triassic, middle Triassic-Jurassic, Cretaceous-early Tertiary and late Tertiary-post late Tertiary. The dominant stages are late Permian, late Triassic and Jurassic. There was clear tectonic effect during the evolution of foreland basin in the Tianshan Orogen.