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Strontium Isotope Composition of Rocks and Ores of the Porozhinsk Deposit (Yenisei Ridge, Krasnoyarsk Region)

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Abstract

Wide variations of 87Sr/86Sr (0.70825‒0.70924) have been established at the Porozhinsk deposit in manganese ores and carbonates ascribed to the Pod’’emsk Formation. These data, together with variations in the carbon (δ13C = –14.6…2.0‰, PDB) and oxygen (δ18О = 19.4…28.3‰, SMOW) isotope composition indicate different conditions of the formation of the studied rocks. The 87Sr/86Sr values in the studied dolomites of the Porozhinsk deposit are much higher than those of carbonate rocks (dolomites, limestones) of the Pod’’emsk Formation from the Chapa River section. The position of the 87Sr/86Sr values of dolomites from the Porozhinsk deposit on the secular 87Sr/86Sr variation curve for Late Proterozoic ocean (Kuznetsov et al., 2014) suggests that the carbonate rocks attributed to the Pod’’emsk Formation at the Porozhinsk deposit have younger age than carbonates of the Pod’’emsk Formation from the Chapa River section. The Mn/Sr values usually taken as a criterion for the degree of secondary alteration of carbonates (in interpreting 87Sr/86Sr variations and discussing the suitability of the material for chemostratigraphic constructions) are not suitable for rocks formed in manganese ore sedimentation basins.

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ACKNOWLEDGMENTS

We are grateful to G.V. Gorshkov and E.G. Pilipchuk for consultation on the geology of the Porozhinsk deposit and invaluable help in the sampling.

Funding

This work was supported by the Presidium of the Russian Academy of Sciences (program no. 1.48) and carried out under the government-financed research project of the Geological Institute of the Russian Academy of Sciences. Field works in the northern Yenisei Ridge were financially supported by the Russian Foundation for Basic Research (project no. 19-05-00794). Accumulation and systematization of the chemostratigraphic data on the Siberian Platform and surrounding old orogenic structures were financially supported by the Ministry of Education and Science of the Russian Federation (Megaproject no. 075-15-2019-1883 “Orogenesis: Formation and Growth of Continents and Supercontinents”).

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  1. Geological Institute, Russian Academy of Sciences, 119017, Moscow, Russia

    V. N. Kuleshov, M. I. Bujakaite & N. B. Kuznetsov

  2. Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, 664033, Irkutsk, Russia

    N. B. Kuznetsov

  3. Siberian Federal University (Institute of Oil and Gas), 660041, Krasnoyarsk, Russia

    L. I. Sviridov

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  1. V. N. Kuleshov
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Kuleshov, V.N., Bujakaite, M.I., Kuznetsov, N.B. et al. Strontium Isotope Composition of Rocks and Ores of the Porozhinsk Deposit (Yenisei Ridge, Krasnoyarsk Region). Lithol Miner Resour 57, 431–448 (2022). https://doi.org/10.1134/S0024490222050029

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