Geochemical indicators of climate changes in Southwestern Siberia (Russia) in the Holocene sediments of Lake Itkul

Авторы

  • Maltsev, A.E. 1
  • Krivonogov, S.K. 1, 2
  • Leonova , G.A. 1
  • Bobrov, V.A. 1
  • Miroshnichenko, L.V. 1
  • 1 Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, Ac. Koptyuga ave., 3, Novosibirsk, 630090, Russia
    2 Department of Geology and Geophysics, Novosibirsk State University, Pirogova str., 1, Novosibirsk, 630090, Russia

DOI:

https://doi.org/10.31951/2658-3518-2022-A-4-1488

Ключевые слова:

bottom sediments, geochemistry, XRD analysis, Holocene, paleoclimate

Аннотация

We present the results of study the Holocene sediments of Itkul Lake, a shal low brackish lake with carbonate sedimentation, located in the eastern part of Baraba lowland (Southwestern Siberia, Novosibirsk Region). A 1.8 m thick core of the Holocene (7.9 14C yr) sediments of Itkul Lake has been studied. Based on the geochemical and lithostratigraphic properties of the bottom sediments, we have established the following stages of the lake evolution: (I) the beginning of sedimentation, 7.8–7.0 14С ka; (II) extreme shallowing with a probable complete drying, ~7.0–5.5 14С ka; (III) rise in the water level, ~5.5–4.3 14С ka; (IV) repeated shallowing, 4.3–2.8 14С ka; and (V) subsequent  watering, 2.8–0 14С ka. At present, the lake again tends to shallowing.

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Опубликован

02.09.2022

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