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首页> 外文期刊>Estuarine Coastal and Shelf Science >Combined analysis of sulfur and carbon contents, and foraminifer as paleoenvironmental indicators in tidal flat sediments on Miura Peninsula, Japan
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Combined analysis of sulfur and carbon contents, and foraminifer as paleoenvironmental indicators in tidal flat sediments on Miura Peninsula, Japan

机译：硫磺和碳含量的综合分析，以及多村半岛潮汐沉积物中的古环境指标

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摘要

Reconstruction of natural hazards from tidal flat sediments is essential for assessment of coastal hazards, and is based on knowledge of recent sediments. This study therefore examined recent sediments deposited on a narrow, muddy tidal flat on Miura Peninsula, metropolitan Tokyo, Japan, by means of sedimentological analysis, C, N, and S elemental analysis, carbonate content, Cs-137 dating, and analysis of benthic foraminifera (species composition and degree of preservation). Cs-137 profiles of four sediment cores of similar to 20 cm in length showed that the sediments were deposited after the release of Cs-137 by the accident at the Fukushima No. 1 Nuclear Power caused by the Tohoku-oki tsunami at March 2011. Results of C/S ratios of mud fractions indicated that the intertidal deposits in the central bay are characterized by low C/S ratios (4.9-11.4) and the bayhead deposits of the upper intertidal and supratidal zones by higher ratios (13.9-24.9). A fluid-mud layer identified in the central bay had the same C/S ratios and carbonate contents as marine sediments, indicating that the fluid-mud deposits probably resulted from resuspension of mud caused by storm-wave action after March 2011. Faunal analysis of benthic foraminifera showed that very low density of foraminifera can be regarded as one of the defining characteristics of fluid-mud deposits.
机译：从潮汐平沉积物的自然灾害的重建对于评估沿海危害至关重要，是基于近期沉积物的知识。因此，本研究通过沉积学分析，C，N和S元素分析，碳酸盐含量，CS-137约会，近期沉积在Miura Peninsula，Miura半岛的狭窄，泥泞平面上沉积在Miura半岛的狭窄，泥泞平面上沉积物沉积在Miura半岛。 foraminifera（物种组成和保存程度）。 CS-137四个沉积物核心的曲线长度为20厘米，显示沉积物在2011年3月的福岛 - oki海啸引起的福岛1号核电站释放CS-137之后沉积。 C / S泥浆比例的结果表明，中央湾的透沉沉积的特征在于低C / S比（4.9-11.4），并通过更高的比率（13.9-24.9）的上透透明区的Bayhead沉积物（13.9-24.9） 。中央海湾中鉴定的流体泥浆层与海洋沉积物具有相同的C / S比和碳酸盐含量，表明流体 - 泥浆沉积物可能是由于2011年3月后的暴风波动作引起的泥浆中的重新悬浮。 Benthic foraminifera表明，对于流体 - 泥浆沉积物的定义特性，可以将非常低的面包虫密度视为一个。

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