Geochemical and Isotope Characteristics of Carbonates from Ejecta of Mud Volcanoes of the Kura Basin, Azerbaijan

Autor: Boris G. Pokrovsky, Ella V. Sokol, Ad. A. Aliev, O. A. Kozmenko, O. E. Kikvadze, V. Yu. Lavrushin
Rok vydání: 2019
Předmět:
Zdroj: Lithology and Mineral Resources. 54:200-220
ISSN: 1608-3229
0024-4902
DOI: 10.1134/s0024490219030064
Popis: This paper is devoted to the vein and dispersed carbonates from ejecta of mud volcanoes of Azerbaijan. The vein calcites are morphologically diverse and related to the healing of fracture systems. Most of them have δ13C (from –4 to +2‰) and δ18O (from +20 to +26‰) typical of marine carbonates. Some volcanoes contain fragments of the vein calcites enriched in light carbon (δ13C from –49.2 to –6‰), which could be formed in methane seep discharge sites during the Caspian Sea highstand period. In the dispersed carbonates from the clay pulp, the values of δ13C and δ18O change from –6.1 to +11.9‰ and from +23.8 to +32.7‰, respectively. It is shown that the studied carbonate matter has no genetic relation with the modern mud volcanic waters, which are characterized by high concentrations of $${\text{HCO}}_{3}^{-}$$ (up to 8 g/L) and values of δ13C(TDIC) (δ13Cav= +20.0‰) and δ18O(H2O) (δ18Oav= +4.0‰). Based on isotope characteristics and REE patterns, the vein calcites can be ascribed to the products of seawater-assisted postsedimentation transformation of sedimentary carbonates. The obtained data revealed a complete hydrodynamic isolation of mud volcanic channels from aquiferous complexes of host rocks.
Databáze: OpenAIRE
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