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本研究对乌江流域河水U浓度进行了测定,系统讨论了乌江流域干支流河水中U的元素地球化学特征,并对其主要来源进行了辨析。研究结果显示,乌江河水中溶解态U的平均浓度约为0.504μg/L,比世界河流平均水平0.186μg/L及长江平均含量0.45μg/L高,但是低于黄河U含量4.86μg/L,同时也低于世界平均海水U浓度3.3μg/L。来源分析显示,乌江河水中的U主要来源于碳酸盐岩风化,尤其是白云岩的风化,对U行为有决定性的控制作用,说明了在海洋沉积成岩过程中生物作用过程对U行为的重要性。蒸发岩和硅酸盐等的风化过程对乌江河水U的贡献不大。和十年前相比,人类活动对流域河水U的影响明显增加。
In this study, the U concentration of river water in the Wujiang River Basin was measured, and the elemental geochemical characteristics of U in the tributaries of the Wujiang River Basin were systematically discussed. The main sources were also analyzed. The results showed that the average concentration of dissolved U in the Wujiang River water was about 0.504μg / L, which was higher than the average of the world rivers of 0.186μg / L and the average of 0.45μg / L of the Yangtze River, but lower than the U of the Yellow River of 4.86μg / L, At the same time, the average concentration of seawater U in the world is 3.3μg / L. Source analysis shows that the U in the Wujiang River is mainly derived from the weathering of carbonate rocks, especially the dolomite, which has a decisive controlling effect on U behavior, indicating the importance of biological processes on U behavior in ocean sedimentary diagenesis Sex. The weathering process of evaporites and silicates did little to U of Wujiang River. Compared with a decade ago, human activities have significantly increased the impact on watershed U.