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U-Pb age and Sr-chemostratigraphy of limestone from the Sorna Formation, Azyr-Tal Range, Kuznetsk Alatau

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Abstract

The U-Pb(Pb-Pb) age was determined for limestone from member III of the Sorna Formation out- cropped on the Azyr-Tal Range, Kuznetsk Alatau. The weighted average value from three calculated values is 523 ± 5 Ma (MSWD = 0.02, 2σ). This age coincides with the Early Cambrian age interval determined with Sr isotopic chemostratigraphy (87Sr/86Sr ratio is 0.70850–0.70852). The low value of μ2 = 238U/204Pb for limestone is due to the evolution of diagenetic fluid containing lead from the mantle reservoir into the Sorna sediments.

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Authors and Affiliations

  1. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia

    G. V. Ovchinnikova, A. B. Kuznetsov, I. M. Gorokhov, E. F. Letnikova & O. K. Kaurova

  2. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia

    B. M. Gorokhovskii

Authors
  1. G. V. Ovchinnikova
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  2. A. B. Kuznetsov
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  3. I. M. Gorokhov
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  4. E. F. Letnikova
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  5. O. K. Kaurova
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  6. B. M. Gorokhovskii
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Additional information

Original Russian Text © G.V. Ovchinnikova, A.B. Kuznetsov, I.M. Gorokhov, E.F. Letnikova, O.K. Kaurova, B.M. Gorokhovskii, 2011, published in Doklady Akademii Nauk, 2011, Vol. 437, No. 2, pp. 220–223.

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Ovchinnikova, G.V., Kuznetsov, A.B., Gorokhov, I.M. et al. U-Pb age and Sr-chemostratigraphy of limestone from the Sorna Formation, Azyr-Tal Range, Kuznetsk Alatau. Dokl. Earth Sc. 437, 331–334 (2011). https://doi.org/10.1134/S1028334X11030184

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  • DOI: https://doi.org/10.1134/S1028334X11030184

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