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

Maltsev, A.E.; Krivonogov, S.K.; Leonova , G.A.; Bobrov, V.A.; Miroshnichenko, L.V.

doi:10.31951/2658-3518-2022-A-4-1488

Authors

Maltsev, A.E. ¹
Krivonogov, S.K. ^{1, 2}
Leonova , G.A. ¹
Bobrov, V.A. ¹
Miroshnichenko, L.V. ¹

¹

²

DOI:

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

Keywords:

bottom sediments, geochemistry, XRD analysis, Holocene, paleoclimate

Abstract

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.