ABSTRACT Karst springs in the Main Range of the Crimean Mountains and the Crimean Piedmont show a restricted range of values (δ18O = –10.5 to –8.0 ‰, δ2H = –72 to –58 ‰), somewhat more negative than the weighted mean of meteoric precipitation. This suggests preferential recharge at higher elevations during winter months. Groundwater tapped by boreholes splits in three groups. A first group has isotopic properties similar to those of the springs. The second group shows significantly lower values (δ18O = –13.3 to –12.0 ‰, δ2H = –95 to –82 ‰), suggesting recharge during colder Pleistocene times. The third group has high isotope values (δ18O = –2.5 to +1.0 ‰, δ2H = –24 to –22 ‰); the data points are shifted to the right of the Local Meteoric Water Line, suggesting water–rock exchange processes in the aquifer. These boreholes are located in the Crimean Plains and discharge mineralized (ca. 25 g L−1) thermal (65°C) water from a depth of 1600–1800 m. Groundwater associated with mud volcanoes on the Kerch peninsula have distinct isotope characteristics (δ18O = –1.6 to +9.4 ‰, δ2H = –30 to –18 ‰). Restricted δ2H variability along with variable and high δ18O values suggest water–rock interactions at temperatures exceeding 95 °C.

中文翻译：

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克里米亚半岛地下水：首次使用稳定同位素进行系统研究

摘要克里米亚山脉主要山脉和克里米亚山麓的喀斯特泉显示出有限的值范围（δ18O = –10.5 至 –8.0 ‰，δ2H = –72 至 –58 ‰），比流星雨的加权平均值更负沉淀。这表明冬季月份在较高海拔地区优先补给。钻孔抽取的地下水分为三组。第一组具有与弹簧相似的同位素特性。第二组显示显着较低的值（δ18O = –13.3 至 –12.0 ‰，δ2H = –95 至 –82 ‰），表明在较冷的更新世时期补给。第三组具有高同位素值（δ18O = –2.5 至 +1.0 ‰，δ2H = –24 至 –22 ‰）；数据点移动到当地大气水线的右侧，表明含水层中的水-岩交换过程。这些钻孔位于克里米亚平原，从 1600-1800 m 的深度排放矿化（约 25 g L-1）热（65°C）水。刻赤半岛泥火山伴生的地下水具有明显的同位素特征（δ18O = –1.6 至 +9.4 ‰，δ2H = –30 至 –18 ‰）。受限的 δ2H 变异性以及可变的高 δ18O 值表明温度超过 95 °C 时水-岩相互作用。