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首页> 外文期刊>Journal of Asian earth sciences >Late Quaternary deformation of the Longquan anticline in the Longmenshan thrust belt, eastern Tibet, and its tectonic implication
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Late Quaternary deformation of the Longquan anticline in the Longmenshan thrust belt, eastern Tibet, and its tectonic implication

机译：藏东龙门山逆冲带龙泉背斜晚第四纪变形及其构造意义

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摘要

The 2008 Mw 7.9 Wenchuan earthquake and 2013 Mw 6.6 Lushan earthquake are a consequence of ongoing India-Tibet collision and reflect the growth of the Longmenshan thrust belt (LSTB). Assessing seismic hazards associated with the Longquan anticline and its contribution to crustal shortening of the LSTB requires understanding of its fold structure and activity. To address this, the geometry of fluvial terraces across the anticline was surveyed and measured by real-time kinematic (RTK), and these terraces were dated by using radiocarbon with accelerator mass spectrometry (AMS) and optical stimulated luminescence (OSL) methods. Interpretation of seismic reflection profiles suggest that the Longquan anticline grows laterally through kink-band migration and a total cumulative shortening is about 1.13 km in NW-SE direction. Combining with previous studies of depth of decollement, this yields a crustal shortening rate of similar to 1.47 mm/yr in NW-SE direction and constrains the time of initiation of the Longquan anticline deformation to 1-2 Ma in the late Pliocene.
机译：2008年的汶川7.9级地震和2013年的鲁山6.6级地震是印度-西藏持续碰撞的结果，反映了龙门山逆冲带的发展。评估与龙泉背斜有关的地震灾害及其对LSTB地壳缩短的贡献，需要了解其折叠结构和活动。为了解决这个问题，通过实时运动学（RTK）对沿背斜的河流阶地进行了调查和测量，并通过使用放射性碳与加速器质谱（AMS）和光激发发光（OSL）方法对这些阶地进行了测年。地震反射剖面的解释表明，龙泉背斜是通过扭结带迁移而横向生长的，在北西向东南方向总累积缩短约1.13 km。结合以前的深度研究，得出的地壳缩短速率在NW-SE方向上大约为1.47 mm / yr，并且将上新世晚期龙泉背斜变形的起始时间限制在1-2 Ma。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第15期|1-10|共10页
  • 作者

    Li Kang; Xu Xi-Wei; Tan Xi-Bin; Chen Gui-Hua; Xu Chong; Kang Wen-Jun;

  • 作者单位

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

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

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

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

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

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

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  • 正文语种 eng
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  • 关键词

    Wenchuan earthquake; Longmenshan thrust belt; Fluvial terrace; Crustal shortening; Longquan anticline;

    机译：汶川地震;龙门山逆冲带;河床阶地;地壳缩短;龙泉背斜;

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