scholarly journals Geochemical characteristics of bottom sediments of Lake Onega

2021 ◽  
Vol 266 ◽  
pp. 07010
Author(s):  
E.I. Valieva ◽  
E.N. Poludetkina ◽  
O.N. Vidishcheva ◽  
A.K. Mirinets ◽  
A.E. Rybalko
Keyword(s):  
Bottom Sediments ◽  
Geochemical Characteristics ◽  
Open Part ◽  
Biogenic Origin ◽  
Gas Saturation ◽  
Lake Onega ◽  
Chemical Studies ◽  
The Subject

The subject of this article represents results of scientific studies in 2018–2019. The studies indicate that the phenomena of gas saturation of bottom sediments are often observed within the Lake Onega. Basically, this occurs in the mouths, while in the open part of the lake the degree of gas saturation of the sediments is incomparably less. According to the geo-chemical studies, numerous signs confirmed the predominantly biogenic origin of gases.

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.

The Study of Sub-Bottom Sediments in Petrozavodsk Bay of Lake Onega Using Complex Geological-Geophysical Methods of Data Analysis

2019 ◽  
Vol 74 (5) ◽  
pp. 525-531 ◽  
Author(s):  
M. I. Aleshin ◽  
V. G. Gaynanov ◽  
M. J. Tokarev ◽  
A. E. Rybalko ◽  
D. A. Subetto
Keyword(s):  
Data Analysis ◽  
Bottom Sediments ◽  
Geophysical Methods ◽  
Lake Onega

The Crosslinks in TMTD-Zinc Oxide-Natural Rubber Vulcanizates

1960 ◽  
Vol 33 (2) ◽  
pp. 394-397 ◽  
Author(s):  
C. G. Moore
Keyword(s):  
Zinc Oxide ◽  
Natural Rubber ◽  
Appreciable Amount ◽  
Dicumyl Peroxide ◽  
Swelling Properties ◽  
Tetramethylthiuram Disulfide ◽  
Chemical Studies ◽  
The Subject ◽  
Natural Rubber Vulcanizates ◽  
Recent Experimental Work

Abstract The mechanism of vulcanization of natural rubber (NR) by means of tetramethylthiuram disulfide (TMTD) and zinc oxide has been the subject of much recent experimental work and speculation. While such studies have clarified the kinetics and stoichiometry of TMTD decomposition and zinc dimethyldithiocarbamate formation, they have not directly aided our knowledge of the nature of the crosslinks in the resultant vulcanizate. It was earlier suggested that the vulcanizate contained only C—C crosslinks, comparable with those formed by means of di-tert-alkyl (and aralkyl) peroxides, while more recently, disulfide crosslinks have been proposed. However, neither of these views has been confirmed by direct chemical studies of the vulcanizate. Evidence is now presented which shows that there can be no appreciable amount of C—C crosslinking by the TMTD-ZnO combination, and this is consistent with the view that sulfur crosslinks predominate. This conclusion is based on the respective swelling properties in n-decane of dicumyl peroxide vulcanizates (containing only C—C crosslinks) and TMTD-ZnO vulcanizates, which have been treated with methyl iodide in vacuo at 80° C. This reagent is known to cause the fission of C—S and S—S bonds in variously constituted organic mono- and polysulfides and should therefore cause the fission of sulfur crosslinks in a vulcanizate with consequent degradation of the network (cf. Ref. 8), whereas there is no evidence that di-allylic C—C crosslinks can be similarly degraded.

Ecological State and Mineral-Geochemical Characteristics of the Bottom Sediments of the East Siberian Sea

Oceanology ◽  
2020 ◽  
Vol 60 (4) ◽  
pp. 518-531
Author(s):  
A. Yu. Miroshnikov ◽  
M. V. Flint ◽  
En. E. Asadulin ◽  
M. D. Kravchishina ◽  
V. L. Luksha ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Geochemical Characteristics ◽  
Ecological State ◽  
East Siberian Sea

Biological factor controlling methane production in surface sediment in the Polish part of the Vistula Lagoon

2017 ◽  
Vol 46 (2) ◽  
Author(s):  
Andrzej R. Reindl ◽  
Jerzy Bolałek
Keyword(s):  
Bottom Sediments ◽  
Water Exchange ◽  
Methanogenic Archaea ◽  
Biological Factor ◽  
Vistula Lagoon ◽  
Anaerobic Conditions ◽  
Chemical Studies ◽  
Ecosystem Transformation ◽  
Limited Water Exchange ◽  
The Vistula Lagoon

AbstractDue to the limited water exchange, lagoons are particularly prone to eutrophication. The consumption of oxygen in this process, coupled with simultaneous enrichment of bottom sediments with organic matter, reinforces the occurrence of anaerobic conditions and methanogenic growth. Methanogenic archaea activities cause depolymerization of organic compounds accumulated in sediments. As a result of such ecosystem transformation, methane might be produced and emitted from this basin. Chemical studies conducted in 2010 were focused on methane content in the surface bottom sediments in the Polish part of the Vistula Lagoon. The results showed that the highest methane concentration occurs in the southwestern part of this basin (6.45 mmol dm

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