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本文概括性总结了天山东段大型推覆构造的基本特征。根据地质证据和同位素年龄,东天山存在早古生代末,晚古生代晚期和新生代三期推覆构造;根据推覆构造分布规律及构造背景,在平面上划分为五大推覆带、9个大型韧剪带;根据出露岩石的矿物变形相将东天山推覆构造划分为深、中深和浅三个深度层次;通过韧剪变形组构的观察分析,确定了多期韧性变形性质与运动方向。糜棱岩中超微构造、古应力及小构造变形缩短率测量统计,证明东天山推覆变形具有显著的地壳缩短增厚作用。新生代板块碰撞导致本区中新生代盆地基底向造山带A型俯冲,造山带向盆地推覆,其结果就构成了今日看到的镶嵌状盆地-山脉构造地貌景观。
This paper summarizes the basic features of large-scale nappe structures in the eastern Tianshan Mountains. Based on the geological evidence and isotopic age, there are the Early Paleozoic, Late Late Paleozoic and Cenozoic thrust nappe structures in East Tianshan. According to the nappe tectonic distribution and tectonic setting, it is divided into five nappe zones in the plane and nine large According to the mineral deformation of exposed rock, the East Tianshan nappe structure is divided into three depth levels: deep, middle and shallow. Based on the observation and analysis of ductile shear structure, the multi-period ductile deformation properties and the movement direction . Mylonites in the ultra-microstructure, ancient stress and shortening the rate of structural deformation measurement statistics show that the East Tianshan nappe deformation has significant crustal thickening effect. The Cenozoic plate collision led to the A-type subduction of the basement of the Mesozoic-Cenozoic basins to the orogenic belt and the uplift of the orogenic belt to the basin. As a result, the inlaid basin-to-mountain tectonic landscape seen today is formed.