Biogeochemical features of the formation of Holocene sediments in Lake Dukhovoe (Eastern Baikalia)

Authors

  • Leonova G.A. 1
  • Maltsev А.Е. 1
  • Kondratieva L.М. 2
  • Krivonogov S.К. 1
    • 1 V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, av. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
    2 Institute for Water and Environmental Problems, Far Eastern Branch of the Russian Academy of Sciences, st. Dikopoltseva 56, Khabarovsk, 680000, Russia

DOI:

https://doi.org/10.31951/2658-3518-2024-A-4-352

Keywords:

age model, Holocene, sapropel, microorganisms, transformation of organic matter, biogeochemistry

Abstract

A 6-meter core of Holocene sediments from Lake Dukhovoe was studied. As shown by the radiocarbon dating of lacustrine sediments, Lake Dukhovoe was formed in the Early Holocene (10 cal ka BP). The upper 180 cm of sediment is represented by sapropel, and the boundary of lake sediments is at 293 cm. This is an early stage of lake evolution, devoid of biogenic sedimentation. The microbiological studies of the sediment were carried out, which showed a high total number of heterotrophic bacteria in the upper (0–15 cm) and deeper (110–180 cm) sapropel intervals. Mineral bottom sediments (180–293 cm) are characterized by the presence of groups of phosphorus-reducing and ferromanganese bacteria. The contents of Na, Mg, Al, Si, Al, Ca, Fe, Mn, Zr and Cr in sapropel are within the average concentrations for the earth’s crust, and U and Mo exceed them.

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Published

2024-08-26

Issue

2024: №4 (SI:Paleo2024)

Section

Articles

License

Copyright (c) 2024 Limnology and Freshwater Biology

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Creative Commons License
This work is distributed under the Creative Commons Attribution-NonCommercial 4.0 International License.