Abstract The Messinian Salinity Crisis (MSC) successions record extreme fluctuations in the Mediterranean's environmental conditions. However, some of the scenarios that are thought to have caused these extreme environments are contentious. One prominent example of this is the Mediterranean water level during the Lago-Mare stage of the MSC, which is interpreted either as being very low during a largely desiccated Mediterranean punctuated by endorheic lakes (lacustrine scenario) or sufficiently high to enable basin-wide connectivity across the Mediterranean and with the Atlantic and the Eastern Paratethys (lagoonal scenario). In SE Spain, adjoining marginal basins of Sorbas, Nijar and Vera exhibit sedimentary records of the Lago-Mare stage. Here we present 11 new 87Sr/86Sr isotope ratios measured on ostracod (Cyprideis sp.) valves from these successions, which add to the 11 already published data from these basins and whose significance, in terms of water provenance, has not been fully explored. In parallel, we construct a mass balance model that provides quantitative insights into the Sr isotopic composition of the water in which the ostracods dwelt. Overall, measured and published 87Sr/86Sr isotope ratios from Sorbas (0.709066–0.709131), Nijar (0.708814–0.709099) and Vera (0.708764–0.708813) all show lower values than modelled ratios for endorheic lakes (>0.7100). These Spanish basins therefore require an additional source of water with a lower Sr isotope signature which is likely to have been derived from the main Mediterranean waterbody (0.7086–0.7087). This interpretation implies that at least the Western Mediterranean had a relatively high and fluctuating water level during the Lago-Mare stage of the MSC.

中文翻译：

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麦西尼亚盐度危机的拉戈-马雷阶段的高地中海水位：来自西班牙边缘盆地（西班牙东南部）的 Sr 同位素记录的见解

摘要 墨西拿盐度危机 (MSC) 演替记录了地中海环境条件的极端波动。然而，一些被认为导致这些极端环境的情景是有争议的。一个突出的例子是 MSC 的拉戈-马雷阶段的地中海水位，这被解释为在被内陆湖泊（湖泊情景）打断的大部分干燥的地中海期间非常低，或者足够高以实现整个盆地的连通性横跨地中海，与大西洋和东帕特提斯（泻湖情景）交汇。在西班牙东南部，毗邻的 Sorbas、Nijar 和 Vera 边缘盆地展示了 Lago-Mare 阶段的沉积记录。在这里，我们展示了 11 个新的 87Sr/86Sr 同位素比值在介形虫（Cyprideis sp.）上测量。) 来自这些系列的阀门，这些阀门增加了来自这些盆地的 11 个已发表的数据，其在水源方面的重要性尚未得到充分探索。同时，我们构建了一个质量平衡模型，该模型提供了对介形虫所居住水中 Sr 同位素组成的定量见解。总体而言，来自 Sorbas (0.709066–0.709131)、Nijar (0.708814–0.709099) 和 Vera (0.708764–0.708813) 的测量和公布的 87Sr/86Sr 同位素比值都显示低于模拟湖的最终值。因此，这些西班牙盆地需要具有较低 Sr 同位素特征的额外水源，这很可能来自主要的地中海水体 (0.7086–0.7087)。