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Isotopic compositions of C, O, Sr, and S and problem of ages of the Katera and Uakit Groups, western Transbaikal region

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Abstract

The age of the Katera Group, which occupies a large area in the western North Muya Range and occurs 100–150 km east of the Uakit Group, is a debatable issue. Based on geological correlations with reference sections of the Baikal Group and Patom Complex, the Katera and Uakit groups were previously considered nearly coeval units and assigned to Late Precambrian (Khomentovskii and Postnikov, 2002; Salop, 1964). This was supported partly by the Sm–Nd model datings (Rytsk et al., 2007, 2009, 2011). Finds of the Paleozoic flora substantiated the revision of age of the Uakit Group and its assignment to the Late Devonian–Early Carboniferous (Gordienko et al., 2010; Minina, 2003, 2012, 2014). We have established that Sr and C isotopic compositions in carbonates of these groups differ drastically, as suggested by their different ages. Sediments of the Nyandoni Formation (Katera Group), which contains carbonates characterized by minimum values of 87Sr/86Sr = 0.7056 and maximum values of δ13C = 4.9‰, were accumulated in the first half of Late Riphean (800–850 Ma ago), whereas the overlying Barguzin Formation (87Sr/86Srmin = 0.70715, δ13Cmax= 10.5‰) was deposited at the end of Late Riphean (700–750 Ma). Judging from the isotope data, the Nerunda Formation (Uakit Group), which contains carbonates with characteristics matching the most rigorous criteria of fitness for the chemostratigraphic correlation (Sr content up to 4390 μg/g, Mn/Sr < 0.1, δ18O = 23.0 ± 1.8‰), was deposited at the end of Vendian ~550–540 Ma ago). The sequence includes thick typical carbonate horizons with very contrast carbon isotopic compositions: the lower unit has anomalous high δ13C values (5.8 ± 1.0‰); the upper unit, by anomalous low δ13C values (–5.2 ± 0.5‰]). Their Sr isotopic composition is relatively homogeneous (87Sr/86Sr = 0.7084 ± 0.0001) that is typical of the Late Vendian ocean. The S isotopic composition of pyrites from the Nyandoni Formation (Katera Group) (δ34S = 14.1 ± 6.8‰) and pyrites from the Mukhtunny Formation (Uakit Group) (δ34S = 0.7 ± 1.4‰) does not contradict the C and Sr isotopic stratigraphic data.

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  1. Geological Institute, Russian Academy of Institute, Pyzhevskii per. 7, Moscow, 119017, Russia

    B. G. Pokrovsky & M. I. Bujakaite

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  1. B. G. Pokrovsky
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  2. M. I. Bujakaite
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Correspondence to B. G. Pokrovsky.

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Original Russian Text © B.G. Pokrovsky, M.I. Bujakaite, 2016, published in Litologiya i Poleznye Iskopaemye, 2016, No. 4, pp. 307–328.

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Pokrovsky, B.G., Bujakaite, M.I. Isotopic compositions of C, O, Sr, and S and problem of ages of the Katera and Uakit Groups, western Transbaikal region. Lithol Miner Resour 51, 262–282 (2016). https://doi.org/10.1134/S0024490216040076

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