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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：老街盆地（越南红河断裂带）的新构造（中新世至最近）垂直运动：地震危险性评估的一种方法

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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：在此贡献中，我们提出了位于红河断层带越南段的老街盆地的新构造（中新世中期至近期）发展模型。该模型是在中新世中层混合层伊利石-蒙脱石组成分析和镜质体反射率分析的基础上构建的。该模型得到有关切割这些地层的小规模脆性构造结构的新数据的支持，并补充了第四纪河阶的C14年代。此外，我们提供了老蔡盆地近100年以前的古地震证据。我们的研究结果表明：（1）老街盆地是在红河断裂带左移期间形成的grab陷，这是由于grab陷边界和grab陷的走滑断层上的倾斜滑移以及抢断正常故障； （2）沿红河断层带右移时，可能发生了中新世中期充填岩grab的掘进过程，共达2.4 km，可能是由于岩grab边界和grab岩滑移的逆转所致。断层，（3）老街盆地受M5 +地震影响，而此类地震的重现期超过370年，但少于大约5年。 2300年。此外，我们初步估计了老蔡盆地晚约全新世地表隆升速率。 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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