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Isotopic composition of pyritic sulfur from the mud volcanic ejecta in Azerbaijan |
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| Authors: | Ad A Aliev V Yu Lavrushin S V Kokh E V Sokol O L Petrov |
| Institution: | 1.Institute of Geology and Geophysics,National Academy of Sciences,Baku,Azerbaijan;2.Geological Institute,Russian Academy of Sciences,Moscow,Russia;3.Institute of Geology and Mineralogy, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia |
| Abstract: | Geochemical studies of pyrite crystals from the mud volcanic ejecta in Azerbaijan were studied. It is shown that all of them have cubic shape. Determination of the sulfur isotope composition revealed a wide variation range of δ34S values from–27.0 to +26.4‰. Signs of spatial zonation were recorded in the distribution of δ34S values—lower values are confined to the present-day coastline of the Caspian Sea. Appearance of pyrite with a high share of 34S is attributed to sulfate reduction that takes place in an environment with excess organic matter. It is supposed that the isotopically heavy sulfides represent the “neck” facies that are formed at the periphery of mud volcanic conduits at the contact of the hydrocarbon-rich mud volcanic fluids with stratal waters of host sediments. |
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