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首页> 外文期刊>Journal of geodynamics >Late Pleistocene-Holocene tectonic landforms developed along the strike-slip Xianshuihe Fault Zone, Tibetan Plateau, China
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Late Pleistocene-Holocene tectonic landforms developed along the strike-slip Xianshuihe Fault Zone, Tibetan Plateau, China

机译：青藏高原鲜水河断裂带走滑发育的晚更新世-全新世构造地貌

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摘要

Xianshuihe Fault Zone (XFZ), with a maximum sinistral offset of similar to 60 km since 13-5 Ma, is one of the major active fault zones on the eastern Tibetan Plateau. In this study, we investigated the tectonic landforms and slip rate along the central segment of the left-lateral strike-slip XFZ. Field investigations and topographic features show that horizontal offset has been accumulated on the topographical markers of different scales formed since the Late Pleistocene. The central segment of the XFZ is composed of three major faults: Yalahe, Selaha, and Zheduotang faults arranged in a right-stepping echelon pattern, which is mainly characterized by systematical offset of drainages, alluvial fans and terrace risers with typical scissoring structures, indicating a feature of strike-slip fault. We have estimated that the Selaha and Zheduotang Faults participate a slip rate of 5.6 +/- 0.8 mm/yr and 3.4 +/- 0.4 mm/yr respectively of the total similar to 10 mm/yr slip rate across the central XFZ, based on the offset glacial morphology and radiocarbon dates. The present results suggest that the left-lateral slip of the XFZ partitions the deformation of eastward extrusion and northeastward shortening of the central Tibetan Plateau to accommodate the continuing penetration of the Indian plate into the Eurasian plate.
机译：咸水河断裂带（XFZ）自13-5 Ma以来最大左旋偏移约为60 km，是青藏高原东部的主要活动断裂带之一。在这项研究中，我们调查了沿左走向滑动XFZ中心段的构造地貌和滑移率。野外调查和地形特征表明，自晚更新世以来，在不同尺度的地形标志物上已经积累了水平偏移。 XFZ的中段由三个主要断层组成：雅拉河，塞拉哈和折多塘断层以右阶梯形排列，其主要特征是排水系统，冲积扇和具有典型剪式结构的梯级立管的系统偏移，表明走滑断层的特征。我们估计，塞拉哈断裂带和哲多堂断裂带的滑移率分别为5.6 +/- 0.8 mm / yr和3.4 +/- 0.4 mm / yr，与整个XFZ的10 mm / yr滑移率相似，基于偏移的冰川形态和放射性碳年代。目前的结果表明，XFZ的左旋滑动划分了青藏高原中部向东挤压和东北向缩短的变形，以适应印度板块向欧亚板块的持续渗透。

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