Abstract
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.
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Notes
For comparison, we also studied some volcanoes of the Gobustan and Absheron Peninsula.
This observation can be slightly subjective, because the platelets of carbonate veins separated from the host rocks firstly attract attention during the study of the volcanoes.
Cean = Cean = (Ce/CePAAS)/(2Pr/PrPAAS – Nd/NdPAAS) Euan = (Eu/EuPAAS)/(0.5 × Sm/SmPAAS + 0.5 × Gd/GdPAAS) (Bulhar et al., 2004).
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ACKNOWLEDGMENTS
The laboratory geochemical studies of carbonate material were supported by the Russian Science Foundation (project no. 17-17-01056). Carbonate samples were taken during expedition works supported by the Russian Foundation for Basic Research (project nos. 09-05-00225 and 11-05-00590).
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Lavrushin, V.Y., Aliev, A.A., Pokrovsky, B.G. et al. Geochemical and Isotope Characteristics of Carbonates from Ejecta of Mud Volcanoes of the Kura Basin, Azerbaijan. Lithol Miner Resour 54, 200–220 (2019). https://doi.org/10.1134/S0024490219030064
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DOI: https://doi.org/10.1134/S0024490219030064