scholarly journals Authigenic Carbonates in the Water–Biota–Bottom Sediments’ System of Small Lakes (South of Western Siberia)

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 552
Author(s):  
Ekaterina Ovdina ◽  
Vera Strakhovenko ◽  
Emilia Solotchina
Keyword(s):  
Bottom Sediments ◽  
Western Siberia ◽  
Small Lakes ◽  
The South ◽  
Authigenic Carbonates ◽  
X Ray ◽  
Geochemical Barriers ◽  
Water Composition ◽  
Carbonate Formation ◽  
Water Bottom

We studied 46 small, drainless lakes in various landscape types: The sub-taiga (Vasyugan plain), forest–steppe (Baraba lowland), and steppe and subzone of ribbon forests (Kulunda plain). Sampling of lake components (sediments, water, and biota) was performed. The materials were analyzed via a combination of modern analytical methods (atomic absorption spectroscopy, X-ray fluorescence, scanning electron microscopy and X-ray diffractometry). It was found that in the south of Western Siberia, lakes with a bicarbonate-sodium water composition are widespread against the background of general landscape zoning. This composition contributes to the abundant growth of biota in the lakes, which leads to the processes of authigenic carbonate formation from calcite–dolomite series and aragonite on geochemical barriers, i.e., drifting biota–water, submerged biota–water, and water–bottom sediments against a background of terrigenous demolition and organic matter accumulation. The article shows the differences in the composition and structure of low-temperature carbonate minerals formed on various geochemical barriers. It was found that low-magnesium calcite and aragonite are the most common authigenic carbonates in small lakes in the south of Western Siberia and are formed on all three geochemical barriers in lakes. High-magnesium calcites and Ca-excess dolomites are formed only at the water–bottom sediment barrier in lakes with HCO3–Na and Cl–HCO3–Na water composition at pH > 9 and with a total dissolved solids > 3 g·L−1 (in some lakes of HCO3-Na composition with a TDS < 3 g·L−1 and pH > 9).

scholarly journals Mineral Composition of Sapropelles of Lakes of the Right Bank of the Ob River (Middle Ob Region)

2019 ◽  
Vol 9 (1) ◽  
pp. 77
Author(s):  
M. P. Sartakov ◽  
E. M. Osnitsky ◽  
K. Iu. Kudrin ◽  
N. S. Larina
Keyword(s):  
Mineral Composition ◽  
Bottom Sediments ◽  
Western Siberia ◽  
Organic Substances ◽  
Small Lakes ◽  
X Ray ◽  
Ob River ◽  
The Right

The objective of this work is to study the mineral composition of bottom sediments of eight small lakes located on the right bank of the Ob River (Western Siberia) in the Surgut region of the Khanty-Mansiysk Autonomous Okrug - Yugra. The studies were carried out using wave dispersive X-ray fluorescence (WDFR) spectroscopy. The content of organic substances, ash, and oxides in the ash in the samples was determined. Based on these data, the studied bottom sediments were classified. The bottom sediments of Lake S-1 are siltstone sands, lakes Vach Lor and S-189 - weakly sapropelic siltstone sands, lakes S-5, S-6, S-3, S-89, and S-294 - typical sapropels. The article presents the content of the main elements in the ash of the studied samples.

scholarly journals Geo-ecological characteristics of the small lakes bottom sediments in the North of Western Siberia

2021 ◽  
Vol 6 (4) ◽  
pp. 299-307
Author(s):  
Gulnara N. Shigabaeva ◽  
Andrey V. Soromotin ◽  
Еvgeny V. Galunin ◽  
Аnna V. Ruseikina ◽  
Anna А. Kurbash ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Western Siberia ◽  
Statistical Processing ◽  
Point Of View ◽  
Quantitative Chemical Analysis ◽  
Ecological State ◽  
Small Lakes ◽  
The North ◽  
Mobile Forms ◽  
State Of Water

The article analyzes and provides data on the processes of accumulation of heavy metals by bottom sediments from the point of view of environmental assessment. The purpose of this paper is to identify the degree of anthropogenic influence on the lakes of the Tazovskiy and Surgut districts, and assess the ecological state of water bodies and adjacent territories. The main processes occurring in natural reservoirs, which lead to the transfer of toxicants into the environment, are considered. The data of quantitative chemical analysis of bottom sediments of two groups of natural reservoirs with an assessment of their ecological state according to the results of statistical processing of the measured values were obtained. Excess concentrations of metals were recorded: for mobile forms – 2200 times for Fe, 1050 times for Mn, 35 times for Cr, 20 times for Co, up to 15 times for Ni, 5 times for Cu, 3 times for Pb, for acid-soluble forms – 45 000 times for Fe, 550 times for Pb, up to 75 times for Ni, 525 times for Mn, 105 times for Cr, 50 times for Cu, 16 times for Co. The geochemical interpretation of the results of the factor analysis is presented.

scholarly journals Concentration of heavy metals and metalloids in the bottom sediments of the Vilkitsky Island’s lakes (the Kara Sea)

2020 ◽  
Vol 169 ◽  
pp. 01001
Author(s):  
Elena Agbalyan ◽  
Aleksander Krasnenko ◽  
Elena Shinkaruk
Keyword(s):  
Heavy Metals ◽  
Bottom Sediments ◽  
Ecological Status ◽  
Maximum Level ◽  
Kara Sea ◽  
Small Lakes ◽  
Metals And Metalloids ◽  
X Ray ◽  
Remote Areas ◽  
Heavy Metals And Metalloids

We performed this study in order to obtain relevant data about the actual ecological status of the lakes in remote areas of the Russian Arctic. The objective was to determine the level of technogenic pollution of bottom sediments in the lakes on the Vilkitsky island in the Kara Sea. To this end, we examined 8 of the island’s small lakes. The content of heavy metals and metalloids (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, As, Y, Nb) in the samples of bottom sediments was determined using the method of Energy Dispersive X-ray Fluorescence (EDXRF). The total pollution value in the examined bottom sediments varied from Zc = 9.5 to Zc = 15.3. The maximum level of pollution was found in Lake 4 located in an anthropogenically disturbed area due to the levels of Cr, Co, Ni, As, Y, Nb.

scholarly journals Concentration Levels and Features of the Distribution of Trace Elements in the Sapropel Deposits of Small Lakes (South of Western Siberia)

Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1210
Author(s):  
Vera Strakhovenko ◽  
Ekaterina Ovdina ◽  
Georgy Malov ◽  
Nadezhda Yermolaeva ◽  
Eugeniya Zarubina
Keyword(s):  
Trace Elements ◽  
Western Siberia ◽  
Complex Mixture ◽  
Mineral Matter ◽  
Geochemical Background ◽  
Small Lakes ◽  
The South ◽  
Natural Processes ◽  
Lake Catchment ◽  
Concentration Levels

The processes of the migration and concentration of trace elements during sedimentation in small continental lakes in various landscape zones of the south of Western Siberia have been studied. We provide a quantitative assessment of the concentration levels and changes in the regional geochemical background of Cd, Hg, Sb, Zn, and Pb in sapropel deposits over the past 200 years. It was shown that complex natural processes determined by a combination of azonal factors play a fundamental role in the formation of the geochemical and mineral compositions of the bottom sediments of small lakes in various landscape zones in the south of Western Siberia. These consist of: the formation of sedimentary material in the lake catchment depending on the relief, geology, soil, and vegetation cover, as well as anthropogenic influences; the formation of authigenic organic and mineral matter as a result of biological, biochemical, and physicochemical processes; and the deposition of a complex mixture of allochthonous and autochthonous matter at the bottom of a lake, which flows under conditions of prolonged ice formation (anaerobic conditions).

scholarly journals Authigenic carbonates from holocene sediments of Lake Itkul (south of West Siberia) as indicators of climate changes

2019 ◽  
Vol 487 (1) ◽  
pp. 54-59
Author(s):  
E. P. Solotchina ◽  
M. I. Kuzmin ◽  
P. A. Solotchin ◽  
A. E. Maltsev ◽  
G. A. Leonova ◽  
...  
Keyword(s):  
Climate Changes ◽  
Western Siberia ◽  
West Siberia ◽  
Geochemical Data ◽  
Lake Basin ◽  
Brackish Lake ◽  
Authigenic Carbonates ◽  
X Ray ◽  
Climatic Event ◽  
Lake Itkul

The results of the study of carbonate-containing bottom sediments from the shallow brackish Lake Itkul (Western Siberia) are presented. The research methods include X-ray diffractometry (XRD), IR spectroscopy, laser granulometry, elemental analysis, etc. By the modeling of XRD carbonate profiles with the Pearson VII function, carbonate phases were identified and their quantitative ratios were determined. By the comparing of carbonate record with lithological, geochemical data in a dated sedimentary section, the evolution of the lake basin in the Holocene caused of climatic changes was reconstructed. Mineralogical signals of the global climatic event known as Bond event 4 in the South of West Siberia have been discovered.

Zoya Il'inichna Glezer – life and scientific achievements

2019 ◽  
pp. 318-323
Author(s):  
Zinaida V. Pushina ◽  
Galina V. Stepanova ◽  
Ekaterina L. Grundan
Keyword(s):  
Western Siberia ◽  
Kara Sea ◽  
European Russia ◽  
Great Contribution ◽  
The South ◽  
The Creation ◽  
The 1960S ◽  
Scientific Achievements ◽  
South Of European Russia

Zoya Ilyinichna Glezer is the largest Russian micropaleontologist, a specialist in siliceous microfossils — Cenozoic diatoms and silicoflagellates. Since the 1960s, she systematically studied Paleogene siliceous microfossils from various regions of the country and therefore was an indispensable participant in the development of unified stratigraphic schemes for Paleogene siliceous plankton of various regions of the USSR. She made a great contribution to the creation of the newest Paleogene schemes in the south of European Russia and Western Siberia, to the correlations of the Paleogene deposits of the Kara Sea.

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