Active faults and magnitudes of left-lateral displacement along the northern margin of the Tibetan Plateau
Active faults and magnitudes of left-lateral displacement along the northern margin of the Tibetan Plateau
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DOI：
10.1016/j.tecto.2003.09.022
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发表时间：
2004-03
期刊：
影响因子：
2.9
通讯作者：
G. Ding;Jie Chen;Qinjian Tian;Xuhui Shen;C. Xing;K. Wei
中科院分区：
文献类型：
--
作者：
G. Ding;Jie Chen;Qinjian Tian;Xuhui Shen;C. Xing;K. Wei
重要的是记录NMTP沿线的累积水平位移，以便定量地了解自印度-欧亚大陆碰撞以来东亚的应变分配。在阿尔金断裂带西段和中段至柴达木盆地北缘，有大量证据表明，40-35 Ma以来的净位移量为~ 400 km， 25-17 Ma以来沿舒勒南山和中祁连山东南部的净偏移量为~ 150 km。阿尔金断裂带东北方向祁连山—河西走廊的最大水平滑动也是晚渐新世至中新世早期以来的~ 150 km。沿海原断裂（晚中新世以来）减小至仅约60 km，沿中卫-同心断裂（上新世以来约5.3-3）减小至25 km。这清楚地表明沿NMTP的总水平位移向东北减小，断层滑动的时间变年轻。然而，在印度与欧亚大陆辐合的不同阶段，NMTP不同板块的隆升、生长和旋转，使得这一趋势在不同的时间和不同的板块表现得非常复杂。
The northern margin of the Tibetan Plateau (NMTP) is a major intracontinental Cenozoic transpressional zone that comprises a series of active strike-slip faults and thrust faults. It is important to document cumulative horizontal displacements along the NMTP in order to understand quantitatively strain partitioning in East Asia since the India–Eurasia collision. Based on an analysis of horizontal slip along major active faults, the total amount of horizontal displacements is estimated up to 700 km between the Tibetan Plateau and the Tarim Basin since the convergence of India and Eurasia. Along the western and middle segment of the Altyn Tagh fault to the northern margin of the Qaidam Basin, there are abundant evidence that show that the net displacement is ∼400 km since 40–35 Ma, and along the Shulenan Shan and southeast of middle Qilian Shan since 25–17 Ma, the amount of offset is ∼150 km. The largest horizontal slip in Qilian Shan–Hexi Corridor to the northeast of the Altyn Tagh fault is also ∼150 km since late Oligocene to early Miocene. It decreases to only ∼60 km along the Haiyuan fault (since late Miocene) and to 25 km along the Zhongwei–Tongxin fault since the Pliocene (about 5.3–3.4 Ma), at the northeast margin of the Tibetan Plateau. This clearly implies northeastward diminishing of the total horizontal displacement and temporal getting younger of the fault slip along the NMTP. However, this tendency is very complicated at different times and different segments as a result of the uplift, growth and rotation of different segments of the NMTP at different stages during the convergence of India and Eurasia.