Proof of formation of organic matter in upper Devonian carbonate and carbonate-siliceous sediments of the South-Tatar uplift in constant photic layer anoxia

Samples of carbonate and siliceous-carbonate deposits of Semiluk—Sargaev horizons of the N‒NE slope of the South Tatar uplift, Volga-Ural petroliferous basin, have been studied. Specific feature of the source rocks—high concentration of compounds—anoxia testifiers in the photic layer has been identi...

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Bibliographic Details
Published in:Geochemistry international 2017-08, Vol.55 (8), p.726-736
Main Authors: Poludetkina, E. N., Smirnov, M. B., Fadeeva, N. P., Kozlova, E. V.
Format: Article
Language:English
Subjects:
Alkanes
Anoxia
Arches
Carbon
Carbonates
Concentration (composition)
Contamination
Deposits
Devonian
Earth and Environmental Science
Earth Sciences
Geochemistry
Hydrocarbons
Hydrogen sulfide
Hydrogen sulphide
Matter & antimatter
Organic chemistry
Organic matter
Saturated hydrocarbons
Sedimentary basins
Sedimentation
Sediments
Siliceous sediments
Sulphides
Uplift
Water column
Water pollution
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Summary:Samples of carbonate and siliceous-carbonate deposits of Semiluk—Sargaev horizons of the N‒NE slope of the South Tatar uplift, Volga-Ural petroliferous basin, have been studied. Specific feature of the source rocks—high concentration of compounds—anoxia testifiers in the photic layer has been identified. That is, organic matter has been deposited under the conditions of the constant presence of anoxia in the photic layer of the sedimentation basin at sufficiently high thickness of the water column contaminated with hydrogen sulfide. Since by the composition of saturated hydrocarbons the studied samples are typical for deposits of the Semiluk horizon of the central part of the Volga-Ural basin, we can assume a fairly wide prevalence of such conditions within the South-Tatar arch. Changes in the concentrations of the components—anoxia markers—show cyclical changes in output layer contaminated with hydrogen sulfide or its bioproduction within the studied time.
ISSN:0016-7029
1556-1968
DOI:10.1134/S0016702917080079