Доклады Академии наукДоклады Академии наук0869-5652The Russian Academy of Sciences1549310.31857/S0869-56524872208-211Research ArticleThe high-resolution oxygen isotope diagram of late Pleistocene ice wedges of Seyaha yedoma, Eastern Yamal PeninsulaVasil’chukYu. K.vasilch_geo@mail.ruBudantsevaN. A.vasilch_geo@mail.ruVasil’chukA. C.vasilch_geo@mail.ruLomonosov Moscow State University3107201948722082112807201928072019Copyright © 2019, Russian academy of sciences2019<p>The main objective of this work is to study the oxygen isotope composition of late Pleistocene syngenetic ice wedges and to obtain a high-resolution isotope diagram from a carefully sampled outcrop of Seyaha yedoma within of the third lagoon-marine terrace near the Seyaha (Zelyonaya - Green) river mouth, on the bank of the Ob Bay. According to 3 new radiocarbon ages: from 25.2 to 23.3 kyr BP from +2 to +5 m a.s.l., as well as dates: 17.3 kyr from +18.8 m a.s.l. and 11.6 kyr BP from +21.2 m a.s.l., the age of the ice wedge is from 23 to 15 to 18 kyr BP approximately. Values of <sup>18</sup>O in the upper fragment of the ice wedge vary from -25.75 to -3.15. Horizontal variations of <sup>18</sup>O values at a height of +15.2 m amounted to 1.49, from -23.41 to -24.9. The ice of the lower fragment of the ice wedge, at +6 m a.s.l., is characterized by a wider range of <sup>18</sup>O values than in the upper fragment. The horizontal values of <sup>18</sup>O range from -23.41 to -26.63. The obtained oxygen isotope diagram in the upper fragment of the ice wedge has resolution of 80-100 years. According to palaeoreconstruction the average January temperature 23-15 (18) kyr BP ranged from -35 to -39 C.</p>ice-wedge icepalaeotemperature reconstructionsLate Pleistoceneradiocarbonoxygen isotope compositionповторно-жильные льдыпалеотемпературные реконструкциипоздний плейстоценрадиоуглеродизотопно-кислородный состав[Walker D. A., Leibman M. O., Epstein H. E., Forbes B. C., Bhatt U. S., Raynolds M. K., Comiso J. C., Gubarkov A. A., Khomutov A. V., Jia G. J., Kaarlejarvi E., Kaplan J. O., Kumpula T., Kuss P., Matyshak G., Moskalenko N. G., Orekhov P., Romanovsky V. E., Ukraientseva N. G., Yu Q. // Environ. Res. Lett. 2009. V. 4. 16 p.][Vasil’chuk Yu.K., van der Plicht J., Jungner H., Sonninen E., Vasil’chuk A.C. // Earth and Planet. Sci. Lett. 2000. V. 179. № 2. P. 237-242.][Vasil’chuk Yu.K. // Water Resources. 1991. V. 17. № 6. P. 640-647.]