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首页> 外文期刊>The holocene >A multiproxy study distinguishes environmental change from diagenetic alteration in the recent sedimentary record of the inner Cadiz Bay (SW Spain)
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A multiproxy study distinguishes environmental change from diagenetic alteration in the recent sedimentary record of the inner Cadiz Bay (SW Spain)

机译：一项多代理研究将近期内加的斯湾（西班牙西班牙）的沉积记录中的环境变化与成岩作用区别开来。

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In this study, we reconstruct the recent environmental evolution of the inner Cadiz Bay using sedimentary records reaching back as far as AD 1700. We report lithological descriptions of the sediments and extensive mineralogical and geochemical analyses. An extraction technique that identifies different Fe phases provides an assessment of diagenetic alteration, which allows an estimation of the original organic matter inputs to the inner Cadiz Bay. Downcore variations in Corg/N ratios, delta(13)Corg and delta N-15 are related to changes in organic matter sources and the trophic state of the water column. The downcore records of selected trace metals (e.g. Pb, Zn and Cu) are interpreted to reflect changes in heavy metal pollution in the bay, while records of other elements (e.g. Mn and P) are likely overprinted by diagenetic alteration. Major environmental shifts took place during the 20th century, when the population around Cadiz Bay increased exponentially. Increases in sediment accumulation rates, organic matter inputs and heavy metal contents, in parallel with increases in delta(13)Corg and delta N-15 over this period, are interpreted as direct effects of the increasing anthropogenic influence in the area. The results of this study suggest that multiproxy approaches and detailed consideration of diagenetic overprinting are required to reconstruct past environmental conditions from coastal sediments.
机译：在这项研究中，我们使用可追溯至公元1700年的沉积记录来重建加的斯内湾的近期环境演变。我们报告了沉积物的岩性描述以及广泛的矿物学和地球化学分析。识别不同铁相的提取技术可以评估成岩作用，从而可以估算向内加的斯湾输入的原始有机物。 Corg / N比值的下限变化，δ（13）Corg和δN-15与有机物来源的变化和水柱的营养状态有关。选定的痕量金属（例如Pb，Zn和Cu）的下层记录被解释为反映海湾中重金属污染的变化，而其他元素（例如Mn和P）的记录则可能因成岩作用而被套印。在20世纪，Cadiz湾周围的人口呈指数增长，发生了重大的环境变化。在此期间，沉积物沉积速率，有机质输入量和重金属含量的增加与delta（13）Corg和delta N-15的增加并行，被解释为该地区人为影响增加的直接影响。这项研究的结果表明，要从沿海沉积物中重建过去的环境条件，就需要采用多代理方法和对成岩叠印的详细考虑。

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