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首页> 外文期刊>Journal of South American earth sciences >Sea-level rise and sediment budget controlling the evolution of a transgressive barrier in southern Brazil
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Sea-level rise and sediment budget controlling the evolution of a transgressive barrier in southern Brazil

机译：海平面上升和沉积物预算控制着巴西南部海侵屏障的演变

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摘要

This paper presents an evolutionary model for a coastal barrier in the southernmost coastal sector of Brazil during the Holocene. The dataset is based on 15-20 m drill cores and ground-penetrating radar (GPR) records. The model barrier evolution has two main steps. The first step is the transgression of the barrier controlled by sea-level rise during the Postglacial Marine Transgression, which ended at approximately 6-5 cal ka. Radiocarbon dating indicates that the coastal plain began to be flooded by lagoonal waters between ～10 and 6.7 cal ka. The second step comprises a barrier transgression controlled by a negative sediment budget of the beach system during the last 6-5 cal ka in a period of an overall slow sea-level fall of approximately 2 m. During the second step, the transgressive barrier migrated because of coastal erosion (the negative sediment budget) and the landward transference of sand by wind and lagoonal delta washout.
机译：本文提出了全新世期间巴西最南端沿海地区沿海屏障的演化模型。该数据集基于15-20 m的钻芯和探地雷达（GPR）记录。模型障碍的发展有两个主要步骤。第一步是在冰期后海侵期间由海平面上升控制的屏障的越境，其结束时间约为6-5 cal。放射性碳定年表明，沿海平原开始被约10至6.7 cal ka的泻湖水淹没。第二步包括在整个大约2 m的缓慢海平面下降期间，由最后6-5 cal ka期间海滩系统的负沉积物预算控制的屏障越界。在第二步中，由于沿海侵蚀（负沉积物预算）以及风和泻湖三角洲冲刷作用向沙的陆上转移，海侵屏障迁移。

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  • 来源
    《Journal of South American earth sciences》 |2013年第3期|27-38|共12页
  • 作者

    L.G. Lima; S.R. Dillenburg; S. Medeanic; E.G. Barboza; M.L.C.C Rosa; L.J. Tomazelli; B.A. Dehnhardt; F. Caron;

  • 作者单位

    Universidade Federal do Rio Grande do Sul, Institute de Geociencias, Programa de Pos-Graduacao em Geociencias, Av. Bento Goncalves 9500, 91509-900 Porto Alegre, RS, Brazil;

    Universidade Federal do Rio Grande do Sul, Instituto de Geociencias, Centro de Estudos de Geologia Costeira e Oceanica, Av. Bento Goncalves 9500,91509-900 Porto Alegre, RS, Brazil;

    Universidade Federal do Rio Grande, Instituto de Oceanografia, Programa de Pos-Graduacao em Oceanografia Fisica, Quimica e Geologica, Av. Italia, km 8 - Campus Carreiros, 96201-900 Rio Grande, RS, Brazil;

    Universidade Federal do Rio Grande do Sul, Instituto de Geociencias, Centro de Estudos de Geologia Costeira e Oceanica, Av. Bento Goncalves 9500,91509-900 Porto Alegre, RS, Brazil;

    Universidade Federal do Rio Grande do Sul, Institute de Geociencias, Programa de Pos-Graduacao em Geociencias, Av. Bento Goncalves 9500, 91509-900 Porto Alegre, RS, Brazil;

    Universidade Federal do Rio Grande do Sul, Instituto de Geociencias, Centro de Estudos de Geologia Costeira e Oceanica, Av. Bento Goncalves 9500,91509-900 Porto Alegre, RS, Brazil;

    Universidade Federal do Rio Grande do Sul, Instituto de Geociencias, Centro de Estudos de Geologia Costeira e Oceanica, Av. Bento Goncalves 9500,91509-900 Porto Alegre, RS, Brazil;

    Universidade Federal do Pampa, Av. Pedro Anundacao s, 96570-000 Vila Batista Cacapava do Sul, RS, Brazil;

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  • 正文语种 eng
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  • 关键词

    transgressive barrier; Southern Brazil; holocene; coastal evolution;

    机译：越障巴西南部;全新沿海演变;

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