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首页> 外文期刊>Journal of Asian earth sciences >Late Quaternary deformation features along the Anninghe Fault on the eastern margin of the Tibetan Plateau
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Late Quaternary deformation features along the Anninghe Fault on the eastern margin of the Tibetan Plateau

机译：青藏高原东缘安宁河断裂带晚第四纪变形特征

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On the eastern margin of the Tibetan Plateau, the Anninghe, Zemuhe and Xiaojiang faults comprise a N-S-trending active left-lateral fault system extending more than 700 km. The northernmost Anninghe Fault extends for ～200 km, consisting of two sub-parallel N-S trending strands. Along the western strand, the fault traces occur almost strictly along the broad and flat Anninghe valley, displacing high terraces, alluvial fans and tributary channels of the Anninghe River. The eastern strand, on the other hand, cuts through the steep mountain slopes, with prominent rectilinear upslope-facing scarps and shutter ridges against pounded fluvial sediments from the east. The displacements along the eastern strand are much larger than that along the western strand, indicating the eastern strand is the major fault absorbing the E-W shortening. This study demonstrates that the Anninghe Fault is now acting as a relief-building boundary fault and absorbing the E-W compression under the eastwards motion of the Tibetan Plateau. Accordingly, the Anninghe region is a topographic transition area from steep relief to low gradient topography. The variation in topographic gradient is consistent with the differing tectonic regime between southern and northern parts of the Tibetan Plateau.
机译：在青藏高原东缘，安宁河，泽木河和小江断层包括一个南北向活动的活跃左侧断层系统，延伸了700多公里。最北端的安宁河断裂带延伸至〜200 km，由两个亚平行的南北向趋势带组成。沿西线，断层痕迹几乎严格沿着宽阔而平坦的安宁河流域发生，取代了安宁河的高阶阶地，冲积扇和支流通道。另一方面，东部河段穿过陡峭的山坡，并具有明显的直线形的上坡向陡峭的陡坡和与来自东部的沉重河流沉积物相对的百叶窗山脊。东部带的位移远大于西部带的位移，表明东部带是吸收E-W缩短的主要断层。这项研究表明，安宁河断层现在起着救济建筑边界断层的作用，并在青藏高原向东运动的情况下吸收了E-W压缩。因此，安宁河地区是从陡坡到低坡度地形的过渡区域。地形梯度的变化与青藏高原南部和北部地区不同的构造机制相一致。

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