Abstract

Waters at seventeen mud volcanoes of the Kerch–Taman province in the Northwestern Cis-Caucasus region have been analyzed for Sr isotope composition. The ⁸⁷Sr/⁸⁶Sr ratios vary from 0.70734 to 0.71076 and show positive correlation with δ¹⁸О, as well as with fluid generation temperatures estimated using the Mg–Li geothermometer. The results revealed that the mud volcano system of the province was separated from the fluid systems of deeper Mesozoic sedimentary strata that fill the West Kuban Basin. The mud volcano water budget includes a major contribution from dehydration waters that release during illitisation of smectite, which occurs within the Maykop Shale sedimentary sequence. At the same time, ⁸⁷Sr/⁸⁶Sr ratios reflect lithological and geochemical heterogeneity of shallow sedimentary strata of the West Kuban Basin.

中文翻译：

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刻赤-塔曼省泥火山水的锶同位素组成

摘要

已经分析了西北独联体-高加索地区刻赤-塔曼省 17 座泥火山的水的 Sr 同位素组成。在⁸⁷ SR / ⁸⁶ Sr比值变化从0.70734到0.71076，并显示与δ正相关¹⁸ О，以及与使用该镁锂地温估计流体产生温度。结果表明，该省的泥火山系统与充满西库班盆地的较深的中生代沉积地层的流体系统分离。泥火山水收支包括来自蒙脱石伊利化过程中释放的脱水水的主要贡献，这发生在 Maykop 页岩沉积层序中。同时，⁸⁷ Sr/ ⁸⁶Sr 比值反映了西库班盆地浅层沉积地层的岩性和地球化学非均质性。