Abstract Several solute-source models have been proposed to elucidate the origin of the solutes in the Gulf coastal sabkhas. The Ascending Brine hydrogeologic model has been shown to be a viable explanation for the origin of solutes in the Arabian (Persian) Gulf coastal sabkha in the UAE (United Arab Emirates). A coastal sabkha approximately 500 km northwest of the UAE sabkha and 40 km northwest of Dhahran, Kingdom of Saudi Arabia was selected to test the general applicability of this conceptual model. The Cl and Br relationship was used to assess the source of solutes in combination with the activities of 226Ra, and bromine isotopes δ81Br. The possible origin of water in the system was constrained using isotopes of δ18O, δ2H, and activity of 3H. The analyses of Cl−/Br−, 226Ra activity and bromine isotopes δ81Br indicate solutes are consistent with the Ascending Brine model and incompatible with seawater based models. Isotopes of δ18O, δ2H, and activity of 3H suggest most of the water is from local precipitation. Whereas the geology, solute chemistry, and mineral sequence is different in both sites, water and solute isotopes at this site are consistent with the proposed Ascending Brine model.

中文翻译：

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沙特阿拉伯王国东部地区沿海 sabkhas 卤水的地球化学和同位素分析

摘要 已经提出了几种溶质源模型来阐明墨西哥湾沿岸sabkhas 中溶质的起源。上升盐水水文地质模型已被证明是对阿联酋（阿拉伯联合酋长国）阿拉伯（波斯）湾沿海 sabkha 中溶质起源的可行解释。选择了阿联酋 sabkha 西北约 500 公里和沙特阿拉伯王国宰赫兰西北 40 公里的沿海 sabkha 来测试该概念模型的普遍适用性。Cl 和 Br 关系用于结合 226Ra 和溴同位素 δ81Br 的活性来评估溶质的来源。系统中水的可能来源受到 δ18O、δ2H 同位素和 3H 活度的限制。Cl-/Br-的分析，226Ra 活性和溴同位素 δ81Br 表明溶质与升盐水模型一致，但与基于海水的模型不兼容。δ18O、δ2H 的同位素和 3H 的活度表明大部分水来自局部降水。尽管两个地点的地质、溶质化学和矿物序列不同，但该地点的水和溶质同位素与提议的升盐水模型一致。