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Geochemistry of sediments in the modern Aral Basin

机译：现代咸盆地的沉积物地球化学

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摘要

The study presents the first geochemical data on the bottom sediments from the modern desiccating Aral Sea, which allowed a direct comparison between the compositions of the sediments collected during the pre- and postdesiccation periods. This study revealed the differences and similarities in the major and trace element composition of the sediments collected from the former bottom of the Large Aral Sea, the present-day sea bottom, the desiccated sea bottom, and the Amu Darya suspended sediments with respect to the average shale composition. The euxinic sediments from the western deep-water depression are characterized by high concentrations of U, Mo, and organic matter. The precipitation of evaporite salts occurs at the shallowest depths and in the western depression. The salt deposits exposed by the shrinking sea tend to be desalinated due to intense weathering. The mercury detected at high levels in the river suspended sediments of the former Amu Darya discharge was found to be absent in the modern marine sediments due to reductions in the river flow and the possible migration to the atmosphere. Many other trace elements, besides uranium, may also accumulate in seawater.
机译：该研究提供了有关现代干燥咸海底部沉积物的第一份地球化学数据，从而可以直接比较干燥前后的沉积物组成。这项研究揭示了从大咸海的前海底，现今的海底，干燥的海底和阿姆河谷悬浮沉积物中收集的沉积物的主要和微量元素组成的异同。页岩平均组成。西部深水depression陷的富余化沉积物以高浓度的铀，钼和有机质为特征。蒸发盐的沉淀发生在最浅的深度和西部凹陷处。由于强烈的风化作用，不断收缩的海洋暴露出来的盐分沉积物往往会被淡化。由于河流流量减少以及可能向大气的迁移，在以前的阿穆达里亚河排放的河流悬浮沉积物中高水平检测到的汞被发现在现代海洋沉积物中不存在。除铀外，许多其他微量元素也可能在海水中积累。

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