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带的远端部分。它们是研究不同时间尺度上长期存在、但快速发展且目前发生地震的断层网络的理想场所。卫星大地测量得出的强烈地震活动、高地势和快速运动表明天山板内造山运动完全活跃。暴露的断层和地貌指标揭示了活跃的逆冲、褶皱和走滑运动。天山及其北部大伊犁盆地的新生代同构造盆地的充填记录了早期的隆升历史。伊犁盆地呈现出非典型的弯曲前陆盆地的陡峭断控凹陷。它的南缘目前正在被活跃的逆冲锋分割和挖掘出来，而它的远端部分则保留了天山隆起的长期记录。我们将构造地质学、地貌构造学和盆地分析与遥感和地理信息系统相结合，为选定的断面导出由变形、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、发光和宇宙成因表面测年的限制。包括现有的生物地层数据。估算的剥蚀、隆起和变形速率将与 3D 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.