The first uranium-thorium dating of the Middle Neopleistocene peat in West Siberia |
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Authors: | F E Maksimov S A Laukhin Kh A Arslanov V Yu Kuznetsov G N Shilova S B Chernov I E Zherebtsov S B Levchenko |
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Institution: | 1.St. Petersburg State University,St. Petersburg,Russia;2.Institute of Problems of Development of the Russian North, Siberian Branch,Russian Academy of Sciences,Tyumen,Russia;3.PGO Aerogeologiya,Moscow,Russia |
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Abstract: | For a sample from the roof of peat (0–2 cm) located in a reference section for the Middle Neopleistocene in West Siberia near
the village of Krivosheino, we obtained an exorbitant value of 14C date ≥53.9 ka B.P. (LU-6024). In the peat proper, the 230Th/U dates obtained by the isochronous method are 195.2 ± 10.8/9.1 ka B.P. for the L/L model and 204.1 ± 17/13 ka B.P. for
the TSD model. The palynospectra of the peat characterize, from the bottom up, birch forests with fir and spruce participation;
then spruce forests with fir; next spruce-cedar forests, similar to the middle taiga subzone. In the clay, the following palynospectra
have been examined: forb-gramineous grasslands and light forests with spruce and Betula fruticosa. In the upper part of clays, the palynospectra reflect the evolution of swampy, birch, light forests with spruce participation.
The conclusion is made that the studied part of the section formed at the end of the Samarovo Ice Age and in the last third
of the Taz Ice Age. The break in sedimentation related to the erosion contact covers a part of the Samarovo Ice Age and the
first two-thirds of the Taz Ice Age. |
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