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首页> 外文期刊>Geosciences Journal >Hydrochemistry and isotope geochemistry of Song Stream, a headwater tributary of the South Han River, South Korea
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Hydrochemistry and isotope geochemistry of Song Stream, a headwater tributary of the South Han River, South Korea

机译：韩国南汉江的上游支流宋溪的水化学和同位素地球化学

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摘要

To investigate the geochemical and isotopic characteristics of a headwater tributary of the South Han River, we analyzed major elements, stable isotopes of oxygen, hydrogen, carbon, and sulfur, and strontium (Sr) isotopes of stream and groundwater samples collected from the Song Stream watershed in summer 2003. The stream water samples of the study area were divided into three water types, among which dissolved ion concentrations differed considerably. Our results strongly indicate that the chemical composition of Song Stream is controlled by silicate and carbonate weathering, as well as anthropogenic contamination, and variations in major dissolved ions and Sr isotopic ratios are mainly correlated to lithological variations in the watershed. The dissolved loads of the main channel of Song Stream are largely controlled by carbonate dissolution. Thus, the water chemistry of the main channel is probably dominated by the chemical weathering of carbonates, even where carbonates comprise only a minor proportion of the bedrock geology. The Sr isotopes and Mg/Ca molar ratios indicate that a dolomite end-member may exist in the study area, which would be compatible with the cationic characteristics of Song Stream. All groundwater samples from the study area, except for one, had significantly high nitrate concentrations (0.75–2.42 mmol/L) that exceeded the drinking-water standard and possibly resulted from both sewage and agricultural inputs.
机译：为了调查南汉江上游水源支流的地球化学和同位素特征，我们分析了主要元素，从宋溪采集的溪流和地下水样品中的氧，氢，碳和硫的稳定同位素以及锶（Sr）同位素该流域是2003年夏季的分水岭。研究区域的溪流水样分为三种水类型，其中溶解离子浓度差异很大。我们的结果有力地表明，宋流的化学成分受硅酸盐和碳酸盐的风化作用以及人为污染的控制，主要溶解离子和Sr同位素比的变化主要与流域的岩性变化有关。宋河主河道的溶解负荷在很大程度上受碳酸盐的溶解控制。因此，即使碳酸盐仅占基岩地质的一小部分，主渠道的水化学也可能受碳酸盐的化学风化作用所支配。 Sr同位素和Mg / Ca摩尔比表明研究区可能存在白云岩端元，这与Song Stream的阳离子特征兼容。除一个研究区外，所有研究区域的地下水样品中硝酸盐的浓度都很高（0.75–2.42 mmol / L），超过了饮用水标准，可能是污水和农业投入的结果。

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