Isotopic composition of pyritic sulfur from the mud volcanic ejecta in Azerbaijan

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 δ 34 S values from–27.0 to +26.4‰. Signs of spatial zonation were recorded...

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Bibliographic Details
Published in:Lithology and Mineral Resources 2017-09, Vol.52 (5), p.358-368
Main Authors: Aliev, Ad. A., Lavrushin, V. Yu, Kokh, S. V., Sokol, E. V., Petrov, O. L.
Format: Article
Language:English
Subjects:
Chemical composition
Coastal environments
Crystals
Earth and Environmental Science
Earth Sciences
Ejecta
Ejection
Fluids
Geochemistry
Isotope composition
Isotopes
Mineral Resources
Mineralogy
Mud
Organic matter
Pyrite
Sedimentary facies
Sedimentology
Sediments
Sulfate reduction
Sulfur
Sulfur isotopes
Sulphur
Zonation
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Summary: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 δ 34 S values from–27.0 to +26.4‰. Signs of spatial zonation were recorded in the distribution of δ 34 S values—lower values are confined to the present-day coastline of the Caspian Sea. Appearance of pyrite with a high share of 34 S 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.
ISSN:0024-4902
1608-3229
1573-8892
DOI:10.1134/S0024490217050029