Mud Volcanic Fluids of the Kerch–Taman Region: Geochemical Reconstructions and Regional Trends. Communication 1: Geochemical Features and Genesis of Mud-Volcanic Waters

• Published in: Lithology and Mineral Resources Vol. 56; no. 6; pp. 461 - 486
• Main Authors: Lavrushin, V. Yu, Aydarkozhina, A. S., Sokol, E. V., Chelnokov, G. A., Petrov, O. L.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.11.2021; Springer Nature B.V
• Subjects: Communication; Dehydration; Earth and Environmental Science; Earth Sciences; Fluids; Geochemistry; Illite; Illites; Mineral Resources; Mineralogy; Mud; Mud volcanoes; Sedimentology; Smectites; Trace elements; Volcanic activity; Volcanoes; H in water; Kerch and Taman peninsulas; mud volcanoes; O and δ; δ
• ISSN: 0024-4902; 1608-3229; 1573-8892
• DOI: 10.1134/S0024490221060043

The chemical and isotopic characteristics (δ 18 O and δ 2 H) of water from 42 mud volcanoes of the Kerch–Taman region (Crimean–Caucasus district) were analyzed. The formation temperatures of mud volcanic waters were estimated using the Mg-Li hydrochemical geothermometer (t(Mg-Li) = 40–134°C). It was revealed that dehydration waters released during the smectite–to-illite transformation play significant role in the total fluid balance of the mud volcanic systems (up to 80% of the total fluid volume). These waters are characterized by low Cl ion contents, δ 18 O from +13 to +17‰, and δ 2 H from –25 to –20‰ relative to VPDB, and high concentrations of , B, Li, Ba and other trace elements. Correlations between the concentration of HCO 3 , B, δ 18 O, and t(Mg-Li) values were revealed.