Evolution of a thick-skinned thrust system and associated basins, Northern Tien Shan, Kzakhstan

中亚的天山山脉是地球上最活跃的大陆碰撞区的远端部分。它们是在不同时间尺度上研究长寿命、快速演变和当前发震断层网的理想场所。强烈的地震活动性、高地形和卫星大地测量的快速运动表明，天山的板内造山运动十分活跃。暴露的断层和地貌指标显示活跃的逆冲、褶皱和走滑运动。早期隆升历史以新生代同构造盆地的充填记录，包括天山及其以北的大伊犁盆地。伊犁盆地具有不典型的弯曲前陆盆地的陡边断控坳陷。其南缘目前正被活跃的逆冲锋面分割和挖掘，而其远端则保存着天山隆升的长期记录。我们将把构造地质学、形态构造学和盆地分析与遥感和地理信息系统相结合，为选定的样带导出由变形、隆起和盆地演化记录的断层系统传播的定量重建。时间将受到磷灰石裂变径迹、(U-Th)/He、发光和宇宙表面测年的限制。包括现有的生物地层资料。剥蚀、隆升和变形的估计速率将与三维结构建模相结合，得出断层系统演化的时空模型。

The Tien Shan mountains of Central Asia are a distal part of the Earth´s most active continental collision zone. They are an ideal site to study long-lived, yet rapidly evolving and presently seismogenic fault networks on various time scales. Strong seismicity, high topography and fast motions derived from satellite geodesy demonstrate that intraplate orogeny in the Tien Shan is fully active. Exposed faults and geomorphic indicators reveal active thrusting, folding and strike-slip motion. The earlier uplift history is documented by the infill of Cenozoic syntectonic basins, both within the Tien Shan and in the large Ili Basin north of it. The Ili basin exhibits steep-sided, fault-controlled depressions atypical of flexural foreland basins. Its southern margin is presently being segmented and exhumed by the active thrust front, whereas its distal parts preserve a long record of the Tien Shan´s uplift. We will integrate structural geology, morphotectonics and basin analysis with remote sensing and GIS, to derive for a selected transect a quantitative reconstruction of fault system propagation as recorded by deformation, uplift and basin evolution. The timing will be constrained from apatite fission track, (U-Th)/He, luminescence and cosmogenic surface dating. Existing biostratigraphic data are included. Estimated rates of denudation, uplift and deformation will be combined with 3D structural modelling to derive a time-space model of fault system evolution.