ABSTRACT Elemental and isotopic pattern of n(87Sr)/n(86Sr) and δ88Sr/86SrSRM987 were used to characterise groundwater and recharge of saline ponds in a clastic aquifer in East Austria. Therefore, shallow, artesian and thermal groundwaters of the investigated aquifer along with rainfall and rivers were analysed using (MC) ICP-MS. The n(87Sr)/n(86Sr) ratio and elemental pattern changed with aquifer depth as a result of progressing bedrock leaching and dissolution with increasing groundwater residence time. The n(87Sr)/n(86Sr) ratio of shallow groundwater below saline ponds of 0.71019 ± 0.00044 was significantly different from thermal groundwater of 0.71205 ± 0.00035 (U, k = 2). In contrast to previous theories, this result suggested no recharge of saline ponds by upwelling paleo-seawater. Isotope pattern deconvolution revealed that rainfall accounted to about 60% of the n(87Sr)/n(86Sr) ratio of shallow groundwater below saline ponds. The δ88Sr/86SrSRM987 values of groundwater decreased from about 0.25 ‰ in most shallow, to predominantly negative values of about –0.24 ‰ in artesian groundwater. This result indicated leaching and dissolution of weathered minerals. In turn, the δ88Sr/86SrSRM987 of deep thermal groundwater showed positive values of about 0.12 ‰, which suggested removal of 86Sr from solution by carbonate precipitation. These results highlight the potential of δ88Sr/86SrSRM987 signature as an additional geochemical tracer.

中文翻译：

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分析 n(87Sr)/n(86Sr)、δ88Sr/86SrSRM987 和元素模式，以表征奥地利东部碎屑含水层中地下水和咸水池的补给

摘要 n(87Sr)/n(86Sr) 和 δ88Sr/86SrSRM987 的元素和同位素模式用于表征奥地利东部碎屑含水层中地下水和盐水池的补给。因此，使用 (MC) ICP-MS 分析了所研究含水层的浅层、自流和热地下水以及降雨和河流。n(87Sr)/n(86Sr) 比值和元素模式随含水层深度而变化，这是由于随着地下水停留时间增加而进行的基岩淋溶和溶解。咸水池下方浅层地下水的 n(87Sr)/n(86Sr) 比值为 0.71019 ± 0.00044，与热地下水的 0.71205 ± 0.00035 (U, k = 2) 存在显着差异。与之前的理论相反，这一结果表明古海水不会通过上涌的古海水补给咸水池塘。同位素模式解卷积显示，降雨量约占咸水池下方浅层地下水 n(87Sr)/n(86Sr) 比率的 60%。地下水的 δ88Sr/86SrSRM987 值从最浅层的约 0.25 ‰ 下降到自流地下水中约 –0.24 ‰ 的负值。该结果表明风化矿物的浸出和溶解。反过来，深部热力地下水的δ88Sr/86SrSRM987显示出约0.12‰的正值，这表明碳酸盐沉淀从溶液中去除了86Sr。这些结果突出了 δ88Sr/86SrSRM987 特征作为附加地球化学示踪剂的潜力。在自流地下水中主要为约 –0.24 ‰ 的负值。该结果表明风化矿物的浸出和溶解。反过来，深部热力地下水的δ88Sr/86SrSRM987显示出约0.12‰的正值，这表明碳酸盐沉淀从溶液中去除了86Sr。这些结果突出了 δ88Sr/86SrSRM987 特征作为附加地球化学示踪剂的潜力。在自流地下水中主要为约 –0.24 ‰ 的负值。该结果表明风化矿物的浸出和溶解。反过来，深部热力地下水的δ88Sr/86SrSRM987显示出约0.12‰的正值，这表明碳酸盐沉淀从溶液中去除了86Sr。这些结果突出了 δ88Sr/86SrSRM987 特征作为附加地球化学示踪剂的潜力。