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首页> 外文期刊>Journal of Asian earth sciences >A new shortening rate across the Dushanzi anticline in the northern Tian Shan Mountains, china from lidar data and a seismic reflection profile
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A new shortening rate across the Dushanzi anticline in the northern Tian Shan Mountains, china from lidar data and a seismic reflection profile

机译：根据激光雷达数据和地震反射剖面，中国天山北部独山子背斜的新缩短率

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摘要

In the northern foreland basin of the Tian Shan Mountains, strata have been intensively deformed as a result of the ongoing Cenozoic Indian-Eurasian collision. The Dushanzi anticline lies in the northernmost deformation belt of the Tian Shan Mountains. Understanding the shortening rate and paleoseismicity of the Dushanzi anticline is important for both understanding the propagation of the thrust front of the Tian Shan Mountains and for assessing seismic hazards in this highly populated area. Here we integrate lidar-derived topographic data, a high-quality seismic reflection profile, and field observations across the Dushanzi anticline to resolve the Holocene deformation history of the anticline. A reconstructed longitudinal profile along the Kuitun River that flows across the Dushanzi anticline demonstrates a Holocene history of both folding and faulting. The total shortening from faulting is 4.4 +/- 0.1 m, while the shortening accommodated by folding is 12.6 +/- 1.1 m since 7.5-10 ka B.P. A total of 17.0 +/- 1.1 m of shortening has occurred across the Dushanzi anticline in the Holocene at a rate of 2.0 +/- 0.2 mm/a. This shortening represents up to 18% of the 11 mm/a total shortening rate across the entire eastern Tian Shan Mountains at this longitude. The Holocene shortening rate of the Dushanzi anticline is similar to 6 times greater than its long-term average shortening rate (0.3 +/- 0.1 mm/a) since 4.8 Ma. Furthermore, we analyzed a displaced terrace sequence at a site along the Dushanzi frontal fault and found that the average coseismic dip-slip displacement is 2.5 +/- 0.1 m, with an average recurrence interval of 2.8 +/- 0.3 ka.
机译：在天山山脉的前陆盆地北部，由于新生代持续进行的印度-欧亚碰撞，地层发生了严重的变形。独山子背斜位于天山山脉最北端的变形带。了解独山子背斜的缩短速度和古震性，对于了解天山山脉逆冲锋面的传播以及评估这一人口稠密地区的地震危害都具有重要意义。在这里，我们整合了来自激光雷达的地形数据，高质量的地震反射剖面以及整个独山子背斜的野外观测资料，以解析背斜的全新世变形历史。流经独山子背斜的奎屯河沿岸重建的纵剖面显示出全新世的褶皱和断层历史。断层造成的总缩短为4.4 +/- 0.1 m，而折叠所造成的缩短为7.5-10 ka B.P.为12.6 +/- 1.1 m。全新世的独山子背斜总共发生了17.0 +/- 1.1 m的缩短，速率为2.0 +/- 0.2 mm / a。在此经度下，整个东天山山脉的缩短量占总缩短量的11％/总比例的18％。自4.8 Ma起，独山子背斜的全新世缩短率约为其长期平均缩短率（0.3 +/- 0.1 mm / a）的6倍。此外，我们分析了沿独山子额断裂的一个位置的位移阶地序列，发现同震倾滑平均位移为2.5 +/- 0.1m，平均复发间隔为2.8 +/- 0.3ka。

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  • 来源
    《Journal of Asian earth sciences》 |2018年第1期|131-141|共11页
  • 作者

    Su Peng; He Honglin; Wei Zhanyu; Lu Renqi; Shi Feng; Sun Haoyue; Tan Xibin; Hao Haijian;

  • 作者单位

    China Earthquake Adm, Key Lab Act Tecton & Volcano, Inst Geol, Beijing 100029, Peoples R China;

    China Earthquake Adm, Key Lab Act Tecton & Volcano, Inst Geol, Beijing 100029, Peoples R China;

    China Earthquake Adm, Key Lab Act Tecton & Volcano, Inst Geol, Beijing 100029, Peoples R China;

    China Earthquake Adm, Key Lab Act Tecton & Volcano, Inst Geol, Beijing 100029, Peoples R China;

    China Earthquake Adm, Key Lab Act Tecton & Volcano, Inst Geol, Beijing 100029, Peoples R China;

    China Earthquake Adm, Key Lab Act Tecton & Volcano, Inst Geol, Beijing 100029, Peoples R China;

    China Earthquake Adm, Key Lab Act Tecton & Volcano, Inst Geol, Beijing 100029, Peoples R China;

    China Earthquake Adm, Key Lab Act Tecton & Volcano, Inst Geol, Beijing 100029, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Fluvial terrace; Dushanzi anticline; Tian Shan Mountains; Lidar; Seismic reflection profile;

    机译：河流阶地独山子背斜天山山脉激光雷达地震反射剖面;

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