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The C, O, and Sr Isotope Chemostratigraphy of the Vendian (Ediacaran)–Cambrian Transition, Olekma River, Western Slope of the Aldan Shield

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Abstract—

The Upper Neoproterozoic–Lower Cambrian section in the Olekma River basin is divided (from bottom to top) into the Dikimdia, Seralakh, Porokhtakh, and Pestrotsvetnaya formations, which are mainly composed of dolostones with a subordinate amount of sandstone, silty shales, gypsum, anhydrite, and native sulfur. The isotope data available allow one to substantially correct the stratigraphic units of the Olekma section, which is probably the most completed section on the Siberian Platform, including the transitional strata from the Vendian (Ediacaran) to the Cambrian. The Dikimdia Formation dolostones have typical Late Ediacaran values of 87Sr/86Sr = 0.70837–0.70843 and abnormally high δ13С values (up to 5.1‰), which gives reason to correlate this formation with the Ust’-Yudoma Formation (the stratotype area), the Dengying Formation in South China (548–550 Ma), the Uluntuy Formation of the Baikal Group, and the terminal Ediacaran sections in some other areas. The 87Sr/86Sr ratio decreases upward and reaches a minimum (0.70803–0.70818) near the Porokhtakh–Pestrotsvetnaya boundary. The lowermost part of the Porokhtakh Formation contains a negative carbon isotope excursion (δ13С = –4.4‰) marking the base of the Nemakit-Daldynian Stage, whereas ~8 m below the base of the Pestrotsvetnaya Formation the positive “pre-Tommotian” excursion (δ13С = 4.1‰) is located. There is a sharp decrease in Fe and Mn contents from ~3800 and ~300 ppm to ~2000 and ~130 ppm, respectively, in dolostones at the Ediacaran–Cambrian transition boundary which corresponds to the Seralakh–Porokhtakh boundary. High δ18О values (26.0 ± 1.2‰) do not provide reasons to associate the carbon isotope excursions, the 87Sr/86Sr trend, and variations of Fe and Mn contents with diagenetic alterations.

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ACKNOWLEDGMENTS

The authors are grateful to Director of the Olekma Reserve E.M. Gabyshev and Deputy Director for the research activity Yu. А Rozhkov for their help in organization of the fieldwork.

Funding

This work was performed within the framework of the plan of research works of the Geological Institute of the Russian Academy of Sciences and was supported by the Russian Foundation for Basic Research (project no. 19-05-00427).

Reviewers A.B. Kuznetsov, N.B. Kuznetsov, and E.F. Letnikova

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

    B. G. Pokrovsky, M. I. Bujakaite, O. L. Petrov & A. A. Kolesnikova

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  1. B. G. Pokrovsky
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Pokrovsky, B.G., Bujakaite, M.I., Petrov, O.L. et al. The C, O, and Sr Isotope Chemostratigraphy of the Vendian (Ediacaran)–Cambrian Transition, Olekma River, Western Slope of the Aldan Shield. Stratigr. Geol. Correl. 28, 479–492 (2020). https://doi.org/10.1134/S086959382005007X

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