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СHEMOSTRATIGRAPHY OF THE CARBONATE DEPOSITS OF THE KINTEREP FORMATION IN NORTHWESTERN SALAIR: FIRST DATA

N. I. Vetrova 1, E. V. Vetrov 1,2, E. F. Letnikova 1

1 V.S.Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia; 2 Novosibirsk State University, Novosibirsk, Russia

The results of geochemical, isotope-geochemical (Sr, C, O) surveys of the Kinterep Formation carbonate deposits of Northwestern Salair and U-Pb dating (LA-ICP-MS) of zircons were given. Carbonate rocks represented by pure limestones are characterized by normal values of δ18OSMOW from 19.8 to 23.8 ‰ and δ13 CPDB from –0.7 to +0.9, the isotopic composition of Sr (87Sr/86Sr ratio) varies in a narrow range from 0.708486 to 0.708582.Using Sr and C isotope chemostratigraphy and U-Pb dating of zircons, age limits (525-510 Ma) were determined for the formation time of carbonate deposits of the Kinterep Formation. The first data of isotope chemostratigraphy in combination with the results of geochronological studies made it possible to compare the limestones of the Kinterep Formation of Northwestern Salair with carbonate sections of Siberia and Central Asia.

Keywords: chemostratigraphy, isotope (Sr, C, O) geochemistry, U-Pb dating of zircons, Cambrian, carbonate deposits, Salair.

DOI 10.20403/2078-0575-2022-2-10-23

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