Abstract
The paper presents the results of a study of carbonate and sulfate–carbonate–clayey rocks of the Lower Maeotian in the sections of the bays of Cape Kazantip using a complex of analytical methods. It is established that the greatest variation of chemical, bituminological, phase, and carbon-isotope composition is characterized by carbonate–clay and clayey rocks of the section bottom. It is proved that the initial OM was accumulated mainly under reducing conditions, but has some variations in composition; it is characterized by a low degree of its catagenetic transformation, which indicates the preservation of the primary isotopic composition. The diverse phase composition of the clay fraction is revealed: dioctahedral illite, kaolinite, chlorite, glauconite, and weakly ordered mixed-layer formations of illite/smectite type with different ratios of illite and smectite components and varying degrees of ordering. Modeling of their diffraction profiles showed that the illite/smectite structure may indicate significant depths of sediment mobilization by mud volcanoes. The isotopic composition of the 13Сorg ranges widely from –33.72 to –19.27‰ the mode being –22.1…–24.93‰. The isotopic composition of 13Сorg below –25.6‰ may be related to the entry of isotope-light mass of methane-oxidizing bacteria into the OM. It was revealed that variations of isotopic composition curves 13Сcarb and 13Сorg along the section of the studied rocks are rarely characterized by unidirectional (positive or negative) variations and have different trends along the section. Direction of the 13Сcarb isotope composition curve with some variations has a pronounced upward trend toward heavier weighting, whereas the isotopic values of the 13Сorg reveals reverse tendency. The results obtained prove that the revealed variations in the composition of OM and carbon isotope composition in the Lower Maeotian sections of Cape Kazantip reflect variations in the sedimentation conditions of temperature, salinity, freshwater ingression, bioproductivity fluctuations, and the influence of local gas–fluid deposition. It is proposed to use such accessory minerals as zircon, monazite, and ilmenite as an indicator of mud paleovolcanism.
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ACKNOWLEDGMENTS
The authors would like to thank the staff of the Kazantip Nature Reserve for support and assistance in conducting the research and N.A. Litvinyuk, a researcher of the reserve, personally. The authors are also grateful to the reviewers and the scientific editor of the article for useful recommendations during the preparation of the article.
Funding
The work was carried out within the framework of a state order to the Institute of Geology of the Komi Scientific Center, Ural Branch, Russian Academy of Sciences (no. 122040600013-9), and an agreement on scientific cooperation between the Institute of Geology of the Komi Scientific Center, Ural Branch, Russian Academy of Sciences; Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences; and Joint Directorate of Protected Areas “Zapovednyi Krym.”
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Antoshkina, A.I., Leonova, L.V., Valyaeva, O.V. et al. Lithological, Mineralogical, and Geochemical Features of the Lower Maeotian Sediments of the Kazantip Nature Reserve, Crimea. Geochem. Int. 62, 284–299 (2024). https://doi.org/10.1134/S0016702924030029
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DOI: https://doi.org/10.1134/S0016702924030029