Slip rate of the Qilian Shan frontal thrust, China, as derived from surface exposure dating

根据地表暴露年代测定得出的中国祁连山锋逆冲断层的滑移率

• 批准号: 5378102
• 负责人: Professor Dr. Manfred Strecker, Ph.D.
• 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: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2003-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5378102?language=en
• 关键词: Slip; rate; Qilian; Shan; frontal

Ongoing crustal shortening and uplift in the Qilian Shan tectonic province (China) leads to lateral growth of the Tibetan Plateau toward the north-northeast. In the western Qilian Shan, the most prominent expression of active shortening is a fault propagation fold associated with the range-bounding Qilian Shan frontal thrust. Two rivers flowing across the active structure have formed three main terrace levels in the uplifting hangingwall. This environment is thus exemplary of tectonic and surficial processes involved in mountain building. We propose that 21Ne and 10Be surface-exposure dating of these river terraces combined with a topographic survey will constrain the rates of uplift and shortening across the Qilian Shan frontal thrust. In addition, a comparison between the "incremental strain" recorded by the terraces and the "finite strain" of the fault propagation fold will allow to estimate the onset of faulting. Our study will provide a better understandig of the spatial and temporal evolution of deformation along the margins of continental plateaus, applicable to both collisional and non-collisional settings.

祁连山构造区（中国）正在进行的地壳缩短和隆升导致青藏高原向东北偏北方向横向生长。在西祁连山，最显著的活动缩短表现是与祁连山前缘逆冲断层有关的断层传播褶皱。流经活动构造的两条河流在上升上盘形成了三个主要阶地。因此，这种环境是造山运动所涉及的构造和表层作用过程的典范。我们建议，21 Ne和10 Be表面暴露测年的这些河流阶地结合地形测量将限制整个祁连山前缘逆冲断层的隆升和缩短率。此外，阶地记录的“增量应变”与断层扩展褶皱的“有限应变”之间的比较将允许估计断层的开始。我们的研究将提供一个更好的理解沿着大陆高原边缘变形的时空演化，适用于碰撞和非碰撞设置。