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首页> 外文期刊>Journal of Asian earth sciences >Neotectonic (Miocene to recent) vertical movements in the Lao Cai Basin (Red River Fault Zone, Vietnam): An approach to seismic hazard assessment
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Neotectonic (Miocene to recent) vertical movements in the Lao Cai Basin (Red River Fault Zone, Vietnam): An approach to seismic hazard assessment

机译：Lao Cai盆地（越南红河断裂带）的新推销（中海世 - 近期）垂直运动：地震危险评估方法

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摘要

In this contribution, we present a model of the neotectonic (middle Miocene to recent) development of the Lao Cai Basin located in the Vietnamese segment of the Red River Fault Zone. The model is constructed on the basis of the analysis of mixed-layered illite-smectite composition and vitrinite reflectance analysis of middle Miocene strata. The model is supported by new data on small-scale brittle tectonic structures cutting these strata and is supplemented with C14 dates of Quaternary river terraces. Furthermore, we present the first evidence for paleoseismicity predating the last hundred years in the Lao Cai Basin. Our results show that: (1) the Lao Cai Basin is a graben formed during the left-lateral shift along the Red River Fault Zone due to oblique slip on graben-bounding and graben-cutting strike-slip faults as well as dip slip on graben-cutting normal faults; (2) the exhumation of the middle Miocene strata filling the graben might have amounted up to 2.4 km and took place during the right-lateral shift along the Red River Fault Zone, possibly being affected by the reversal of slip on graben-bounding and graben-cutting faults and, (3) the Lao Cai Basin was affected by M5 + earthquakes, whereas the return period of such earthquakes is more than 370 years but less than ca. 2300 years. Moreover, we tentatively estimate the late Holocene surface uplift rate in the Lao Cai Basin at ca. 7 mm/year.
机译：在这一贡献中，我们展示了一个位于红河断路区越南区段的老蔡盆地的新推销型（中部内科）的型号。该模型是基于分析混合层硅灰石 - 蒙脱石组合物和中间细胞层中的vitri inte反射率分析的构建。该模型得到了切割这些地层的小型脆性构造结构的新数据，并补充了第四纪河露台的C14日期。此外，我们展示了古奇地造成的第一个证据，以预测老蔡盆地的最后一百年。我们的研究结果表明：（1）Lao Cai盆地是在沿着红河断层区左侧移位期间形成的Graben，因为斜滑动在Graben界限和Graben-Chink滑动故障以及Dip滑动上Graben-Contical常见故障; （2）填充Graben的中间内肾上腺地层的挖掘可能达到2.4公里，并在红河断裂区右侧横向换档期间发生，可能受到Graben边界和Graben的逆转的影响 - 切换故障，（3）老本盆地受M5 +地震的影响，而这种地震的返回期超过370岁但低于CA。 2300年。此外，我们暂时估计在CA的老挝Cai盆地中晚全新世地表隆起速率。 7毫米/年。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第1期|103885.1-103885.13|共13页
  • 作者

    Phan D. P.; Tokarski A. K.; Swierczewska A.; Strzelecki P. J.; Waliczek M.; Krapiec M.; Cuong N. Q.;

  • 作者单位

    Vietnam Acad Sci & Technol Inst Marine Geol & Geophys 18 Hoang Quoc Viet Hanoi Vietnam;

    Polish Acad Sci Res Ctr Krakow Inst Geol Sci Senacka 1 PL-31002 Krakow Poland;

    AGH Univ Sci & Technol Fac Geol Geophys & Environm Protect Al Mickiewicza 30 PL-30059 Krakow Poland;

    AGH Univ Sci & Technol Fac Geol Geophys & Environm Protect Al Mickiewicza 30 PL-30059 Krakow Poland;

    AGH Univ Sci & Technol Fac Geol Geophys & Environm Protect Al Mickiewicza 30 PL-30059 Krakow Poland;

    AGH Univ Sci & Technol Fac Geol Geophys & Environm Protect Al Mickiewicza 30 PL-30059 Krakow Poland;

    Vietnam Acad Sci & Technol Inst Geol Sci 84 Pho Chua Lang Hanoi Vietnam;

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  • 正文语种 eng
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  • 关键词

    Red River Fault Zone; Exhumation; Fractured clasts; Seismic hazard; Late Quatemary tectonics;

    机译：红河断裂区;挖掘;裂缝;地震危害;犹太人的构造;

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