Distribution of elements in the vertical cut of bottom sediments of the Black sea

2020 ◽  
pp. 60-68
Author(s):  
E. I. Nemchenko ◽  
O. A. Lipatnikova ◽  
L. L. Demina ◽  
M. D. Kravchishina ◽  
T. N. Lubkova
Keyword(s):  
Black Sea ◽  
Bottom Sediments ◽  
Vertical Section ◽  
Water Layer ◽  
Enrichment Factors ◽  
Trace Element Composition ◽  
The Black Sea ◽  
Bottom Water Layer ◽  
Sea Bottom ◽  
Significant Enrichment

The trace element composition of the vertical section of the Black Sea bottom sediments was studied. Based on the calculated enrichment factors relative to the average composition of the earth’s crust, it was shown that a lithogenic source is predominant for most trace elements. Significant enrichment was obtained for Ca and Sr (due to bioaccumulation) and for S, As and Mo (as a result of hydrogen sulfide contamination processes and the influence of mud volcanoes). A specific conditions of sedimentation were estimated based on the elements’ ratios which indicate: a presence of exhalation components in the deposits (Fe+Mn/Ti), a range of transport of terrigenous material (Ti/Zr) were estimated; paleoreconstruction of salinity (Corg/S), as well as redox conditions in the bottom water layer (Mn/Fe, Mo/Mn, V/(V+Ni), V/Mn).

scholarly journals On the possible presence of oxygen in the upper sediment layer of the hydrogen sulfide zone in the Black Sea

2019 ◽  
Vol 59 (1) ◽  
pp. 166-169
Author(s):  
P. A. Stunzhas ◽  
M. B. Gulin ◽  
A. G. Zatsepin ◽  
E. A. Ivanova
Keyword(s):  
Black Sea ◽  
Benthic Fauna ◽  
Water Layer ◽  
Bottom Layer ◽  
The Black Sea ◽  
Depth Range ◽  
Sediment Layer ◽  
Bottom Water Layer ◽  
Long Time ◽  
Eukaryotic Organisms

In the northeastern Black Sea the search was performed for living eukaryotic organisms (micro- and meiobenthos) in hypoxic and anoxic conditions as well as measurement of O2 in the bottom water layer and in the upper layer of sediments. The results have shown the presence of a deep maximum abundance of zoobenthos in a depth range of 215–244 m. This aggregation of benthic fauna occupies a layer of 30 m along the vertical. In general, the proportion of active meiobenthos was no greater than 1.5% of the total number of organisms recorded from the sample.The presence of aerobic benthos near the upper boundary of the H2S zone can be explained by: sliding down of sediments from a higher depth; quasi-periodic O2 supply due to fluctuations in the position of the isopycna and/or sinking of waters downslope in the bottom Ekman layer. Also, in the case of physical entry of oxygen into the bottom layer, it can remain for a relatively long time in the upper part of the H2S zone due to the lack of deep Mn+2 flux and reaction with it.

scholarly journals Organic substances of sea bottom sediments in conditions of the coast urbanization (for example Kazachiya Bay, The Black Sea)

2019 ◽  
Vol 59 (2) ◽  
pp. 234-242
Author(s):  
O. V. Soloveva ◽  
E. A. Tikhonova ◽  
T. L. Klimenko ◽  
G. V. Skrupnik ◽  
T. V. Votinova
Keyword(s):  
Black Sea ◽  
Bottom Sediments ◽  
Polyaromatic Hydrocarbons ◽  
Petroleum Products ◽  
Water Area ◽  
The Black Sea ◽  
Sea Bottom ◽  
Adverse Environmental Conditions ◽  
Coastal Urbanization ◽  
The Impact

The data on the hydrocarbons compound in the sea bottom sediments of adjacent water area to the zone of mass cottage building (Kazachiya Bay, the coast of Sevastopol, the Black Sea) are given. As a result of the survey conducted in the summer of 2015, pH, Eh, natural moisture, chloroform extractable substances, oil hydrocarbons, petroleum products, polyaromatic hydrocarbons and n-paraffins in the sea bottom sediments of the water area were determined. Areas with unfavorable and moderately adverse environmental conditions are identified. The impact of coastal urbanization on the deterioration condition of the sea bottom sediment is shown.

The Distribution of Elements in the Vertical Section of Bottom Sediments in the Black Sea

2020 ◽  
Vol 75 (2) ◽  
pp. 168-176
Author(s):  
E. I. Nemchenko ◽  
O. A. Lipatnikova ◽  
L. L. Demina ◽  
M. D. Kravchishina ◽  
T. N. Lubkova
Keyword(s):  
Black Sea ◽  
Bottom Sediments ◽  
Vertical Section ◽  
The Black Sea ◽  
Distribution Of Elements

scholarly journals The chemical-microbiological characteristics of sea water and bottom sediments of the Kerch Strait and adjacent water areas

2017 ◽  
Vol 2 (3) ◽  
pp. 75-85
Author(s):  
E. A. Tikhonova ◽  
N. V. Burdiyan ◽  
O. V. Soloveva
Keyword(s):  
Surface Layer ◽  
Black Sea ◽  
Bottom Sediments ◽  
Heterotrophic Bacteria ◽  
Sea Water ◽  
Water Area ◽  
The Black Sea ◽  
Azov Sea ◽  
Sea Bottom ◽  
Oil Hydrocarbons

This paper presents the results of contamination level of sea bottom sediments and seawater in the water areas by the strait of the Black Sea and the Azov Sea by oil hydrocarbons and chloroform-extractable substances studies (spring, autumn 2016). Comparison of marine environment pollution levels with the results of previous studies (2007–2010) and sanitary norms is given. The quantitative characteristics of  heterotrophic and oil-oxidizing microbiota in the designated areas are presented. It was determined that the concentration of oil hydrocarbons in the water surface layer in the water area by the strait of the Azov Sea did not exceed the current norm (0.05 mg·l-1). The single cases of the maximum permissible concentration exceeding were registered in the water area by the strait of the Black Sea (autumn 2016). In the surface layer of Azov Sea water, the number of heterotrophic bacteria ranged from 104 to 105 cells·ml-1, and the oil-oxidizing bacteria were isolated in single quantities. In the water area of the Black Sea region of the strait the number of heterotrophic bacteria was 106, the number of oil-oxidizing bacteria did not exceed 10 cells·ml-1. In comparison with the previous years’ data, there was an increase in quantitative indicators of chloroform-extractable substances and oil hydrocarbons in the sea bottom sediments. The overall level of pollution did not exceed the average values determined for the region. The number of heterotrophic bacteria in the sea bottom sediments varied in the Strait of Azov water area from 2,5·104 to 4,5·104 cells·g-1, while that of oil-oxidizing bacteria varied from 2,5·10 to 4,5·102 cells·g-1. In the sea bottom sediments of the Black Sea, the number of heterotrophic bacteria was 4,5·103 cells·g-1, the number of oil oxidizing bacteria was 10 cells·g-1.

Significance of Mineralogical and Lithologic-Petrographical Rank in the Ranking of Geological Information

2020 ◽  
Vol 42 (4) ◽  
pp. 33-49
Author(s):  
O.V. CHEPIZHKO ◽  
V.V. YANKO ◽  
V.M. KADURIN ◽  
I.M. NAUMKO ◽  
S.M. SHATALIN
Keyword(s):  
Fluid Flow ◽  
Black Sea ◽  
Bottom Sediments ◽  
Oil And Gas ◽  
Sedimentary Cover ◽  
Geochemical Characteristics ◽  
The Black Sea ◽  
Flow Parameters ◽  
Geochemical Parameters ◽  
Geological Information

For the first time the importance of mineralogical and lithological-petrographical ranks in the line of geological information ranks is substantiated for implementation of long-term forecasts, standard and non-standard approaches to research of physical and geochemical parameters as a basis of creation of complex system of forecast criteria and prospecting indicators of hydrocarbons within the sedimentary cover of Black sea based on the theory of global fluid-flows derivation. These criteria have different sensitivity to the object (hydrocarbon deposits) and are therefore ranked. The ranking determined the following parameters: 1) seismic data within the object, obtained by the method of deep seismic sounding, RWM SDP; 2) parameters of tectono-geodynamic structures; 3) the main characteristics of sedimentary cover and bedrock; 4) geochemical characteristics; 5) parameters of mineral complexes and fluid inclusions in mineral neoformations; 6) the value of the distribution of meiobenthos. Based on modern views of oil and gas geology, structural-tectonic and lithological-facies criteria are among the main ones. The study of the mineralogical component of sediments is made with using mineralogical, thermobarogeochemical and X-ray spectral methods. Fixation of anomalies of fluid flow at the bottom of the Black Sea as to the distribution of abiotic parameters in order to assess the prospects of oil and gas is determined by structural and tectonic features and high permeability of fluid flow; parameters of mineral complexes (minerals, facies) and genetic connections; heterogeneity of geochemical characteristics of bottom sediments; the presence of hydrocarbon inclusions in authigenic minerals of bottom sediments.

Plutonium and americium in the deep Black Sea bottom sediments

2021 ◽  
Vol 229-230 ◽  
pp. 106540
Author(s):  
Vladislav Yu. Proskurnin ◽  
Nataliya N. Tereshchenko ◽  
Artem A. Paraskiv ◽  
Olga D. Chuzhikova-Proskurnina
Keyword(s):  
Black Sea ◽  
Bottom Sediments ◽  
Sea Bottom
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