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首页> 外文期刊>Estuarine Coastal and Shelf Science >Environmental changes at the inner sector of Ria de Muros (NW Spain) during Middle to Late Holocene
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Environmental changes at the inner sector of Ria de Muros (NW Spain) during Middle to Late Holocene

机译：全新世中期至晚期Ria de Muros（西班牙西北部）内部地区的环境变化

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摘要

A multiproxy approach has been performed on sediments collected by gravity and box coring at the inner part of the Ria de Muros to reconstruct its environmental evolution since the Middle Holocene. This reconstruction is based on the chronological framework provided by radiocarbon dating of foraminifera samples. Three distinct facies were identified in the sedimentary record. The oldest, characterised by coarsegrained sediments and a strong terrestrial signature, is likely linked to the progradation of the delta-fan of the Maior River during a period of standstill subsequent to the Holocene sea-level maximum (ca. 6900 cal yr BP). The second facies started to deposit approximately 2865 ± 335 cal yr BP and is characterized by the deposition of finer-grained, marine-influenced sediments linked to a period of reduced local hydrodynamic energy, most likely due to a progression of sea-level rise. The third facies started to deposit approximately 1720 ± 180 cal yr BP and shows a progressively stronger marine influence. The characteristics of the last facies are explained as the result of the added effects of progressive sea-level rise and an intensified upwelling reaching the inner ria. This facies shows clear anthropogenic features since 555 ± 65 cal yr BP, associated with the important mediaeval development of the area. The obtained results suggest that high-resolution studies are key to resolve possible sea-level oscillations during the late Holocene and allow distinguishing local/regional changes superimposed to the global signals.
机译：自中新世以来，已对重力和里奥德莫罗斯内部的箱形取芯收集到的沉积物采取了多种替代方法，以重建其环境演变。该重建基于有孔虫样品的放射性碳定年提供的时间顺序框架。在沉积记录中发现了三个不同的相。最老的特征是沉积物呈粗粒状且具有强烈的陆地特征，可能与全新世海平面最高（约6900 cal BP）后的停滞期期间的Maior河三角扇的扩张有关。第二相开始沉积约2865±335 cal yr BP，其特征是沉积的细粒，受海洋影响的沉积物与一段时期的局部水动力能量减少有关，最有可能是由于海平面上升的过程。第三相开始沉积约1720±180 cal BP，并显示出逐渐增强的海洋影响力。解释了最后一个相的特征，这是由于海平面逐渐上升和到达内部区域的上升流加剧的结果。自555±65 cal yr BP以来，该相显示出明显的人为特征，与该地区重要的中世纪发展有关。获得的结果表明，高分辨率研究是解决全新世晚期海平面振荡的关键，并且可以区分叠加在全球信号上的局部/区域变化。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2014年第1期|91-101|共11页
  • 作者

    Alba Andrade; Belen Rubio; Daniel Rey; Paula Alvarez-Iglesias; Ana Maria Bernabeu; Mariaelena Fedi;

  • 作者单位

    Grupo GEOMA, Departamento de Geociencias Marinasy Ordenacion del Territorio, Facultad de Ciencias del Mar, Campus Lagoas-Marcosende, Universidad de Vigo, 36310 Vigo, Spain;

    Grupo GEOMA, Departamento de Geociencias Marinasy Ordenacion del Territorio, Facultad de Ciencias del Mar, Campus Lagoas-Marcosende, Universidad de Vigo, 36310 Vigo, Spain;

    Grupo GEOMA, Departamento de Geociencias Marinasy Ordenacion del Territorio, Facultad de Ciencias del Mar, Campus Lagoas-Marcosende, Universidad de Vigo, 36310 Vigo, Spain;

    Grupo GEOMA, Departamento de Geociencias Marinasy Ordenacion del Territorio, Facultad de Ciencias del Mar, Campus Lagoas-Marcosende, Universidad de Vigo, 36310 Vigo, Spain;

    Grupo GEOMA, Departamento de Geociencias Marinasy Ordenacion del Territorio, Facultad de Ciencias del Mar, Campus Lagoas-Marcosende, Universidad de Vigo, 36310 Vigo, Spain;

    LABEC, INFN-Sezione di Firenze, 50019 Sesto Fiorentino, Italy;

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  • 正文语种 eng
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  • 关键词

    Ria de Muros sediments; Holocene palaeoenvironment; organic matter origin; diagenesis; sea-level rise; upwelling;

    机译：Ria de Muros沉积物;全新世古环境;有机物来源;成岩作用海平面上升;上升;

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