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首页> 外文期刊>Journal of South American earth sciences >Morphotectonic analysis of two axial tributary basins of the San Juan river controlled by the Precordillera fold and thrust belt, Central Andes of Argentina
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Morphotectonic analysis of two axial tributary basins of the San Juan river controlled by the Precordillera fold and thrust belt, Central Andes of Argentina

机译：受阿根廷前安第斯山脉褶record和逆冲带控制的圣胡安河两个轴向支流盆地的形态构造分析

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摘要

Analysis of several morphotectonic tools (longitudinal river profiles, knickpoints, swath profiles, and geomorphic indices) together with geomorphological, lithological, and structural data provided objective and quantifiable elements to improve the knowledge of the Quaternary tectonic activity in a region. In this study, we analyzed and compared two large intermountain basins located in the Precordillera of the Central Andes of Argentina. Local distortions in longitudinal river profiles and river patterns may reflect resistant lithology, an increase in shear stress, or differential surface uplift. Both basins have similar shapes, although one mirrors the other producing a large-scale broom-shaped drainage pattern. The values of the Asymmetry Factor and Transverse Topographic Symmetry Factor show opposite signs and almost identical values, suggesting that both basins have mirror symmetry independently of order and scale. The asymmetry in both basins would be a result of the progressive migration of the Andean orogenic front towards the east. Knickpoints were mainly associated with resistant rocks, faults with the scarp facing upstream, or both. In the reaches where the rivers flow across areas with presumed higher rates of uplift, we observed a reduction in the width of the active channel belt by lateral confinement and river pattern changes. The results presented in this paper constitute one of the first attempts to apply geomorphic indices to large drainage basins in the Precordillera fold-and-thrust belt.
机译：对几种构造构造工具（纵向河流剖面，拐点，条幅剖面和地貌指数）的分析以及地貌，岩性和构造数据的结合，提供了客观而可量化的要素，以提高对该地区第四纪构造活动的认识。在这项研究中，我们分析并比较了位于阿根廷中部安第斯山脉的Precordillera的两个大型山间盆地。纵向河流剖面和河流形态的局部变形可能反映了抗岩性，剪切应力增加或表面隆起差异。两个盆都具有相似的形状，尽管其中一个镜面彼此镜像，形成了大规模的扫帚状排水模式。不对称因子和横向地形对称因子的值显示相反的符号，并且值几乎相同，这表明两个盆地的镜像对称性与顺序和比例无关。两个盆地的不对称性是安第斯造山带锋线向东逐渐迁移的结果。拐点主要与坚硬的岩石，断层面向上游的断层或两者有关。在河流跨度较高的地区（假设上升速度较高）流域，我们观察到由于横向约束和河流形态变化，活动河道带的宽度减小了。本文介绍的结果构成了将地貌指标应用于Precordillera褶皱冲断带大型流域的首次尝试之一。

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  • 来源
    《Journal of South American earth sciences》 |2020年第3期|102441.1-102441.21|共21页
  • 作者

    Blanc Pablo A.; Tejada Flavia; Perucca Laura P.; Espejo Karen; Lara Gabriela; Vargas Nicolas;

  • 作者单位

    Univ Nacl San Juan INGEO FCEFN Gabinete Neotecton & Geomorfol Av Ignacio de la Roza 590 RA-5400 San Juan Argentina|CIGEOBIO CONICET Grp Geol Cuaternario Av Ignacio de la Roza 590 RA-5400 San Juan Argentina;

    Univ Nacl San Juan Dept Geol FCEFN Av Ignacio de la Roza 590 RA-5400 San Juan Argentina;

    Univ Nacl San Juan INGEO FCEFN Gabinete Neotecton & Geomorfol Av Ignacio de la Roza 590 RA-5400 San Juan Argentina;

    Univ Nacl San Juan INGEO FCEFN Gabinete Neotecton & Geomorfol Av Ignacio de la Roza 590 RA-5400 San Juan Argentina|Univ Nacl San Juan Dept Geol FCEFN Av Ignacio de la Roza 590 RA-5400 San Juan Argentina;

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  • 正文语种 eng
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  • 关键词

    Morphotectonics; Geomorphic index; Fluvial basin; Precordillera;

    机译：形态构造学地貌指数河流盆前record;

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