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

哈萨克斯坦北天山厚皮逆冲系统及相关盆地的演化

基本信息

批准号：
88470911
负责人：
Professor Dr. Jonas Kley
金额：
--
依托单位：
Institut für Geowissenschaften
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2011-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/88470911?language=en
关键词：
Evolution thick skinned thrust system

项目摘要

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.

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。它们是研究各种时间尺度上长期存在但快速演变的目前孕震断层网络的理想场所。卫星大地测量的强震活动、高地形和快速运动表明，天山板内造山运动十分活跃。暴露的断层和地貌标志揭示了活跃的逆冲、褶皱和走滑运动。天山及其以北的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，伊犁盆地具有不典型的弯曲前陆盆地的陡倾、断层控制的凹陷。它的南部边缘目前正在被活动的逆冲前缘分割和挖掘，而它的远端部分保留了天山隆升的长期记录。我们将把构造地质学、地貌构造学和盆地分析与遥感和地理信息系统结合起来，为选定的断面导出断层系统传播的定量重建，如变形、隆起和盆地演化所记录的。时间将受到磷灰石裂变径迹，（U-Th）/He，发光和宇宙成因表面定年的限制。包括现有的生物地层学数据。剥蚀、隆起和变形的估计速率将与三维结构建模相结合，以得出断层系统演变的时空模型。