Izvestiya of Saratov University. New Series. Series: Earth Sciences

Journal Information
ISSN / EISSN : 1819-7663 / 2542-1921
Published by: Saratov State University (10.18500)
Total articles ≅ 488
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, Kemerovo State University
Izvestiya of Saratov University. New Series. Series: Earth Sciences, Volume 21; https://doi.org/10.18500/1819-7663-2021-21-3-152-158

Abstract:
This article analyzes the current state of space-cartographic research methods and their application in strategic environmental assessment using the example of processing space-cartographic material and its digitalization in order to form a digital management platform that will further allow developing necessary measures for effective environmental management. The basics are briefly outlined and the possibility of using space-cartographic methods to study the state of geoecosystems for solving highly specialized problems in the context of strategic environmental assessment is considered. On a specific example, the main results of these methods application for assessing the geoecological state of the coal-mining areas of the Kemerovo Oblast in the context of strategic environmental assessment are considered.
Yuri V. Preobrazhenskiy, Saratov State University
Izvestiya of Saratov University. New Series. Series: Earth Sciences, Volume 21; https://doi.org/10.18500/1819-7663-2021-21-3-159-165

Abstract:
Identifying the spatial structures of economic activity within a supra-regional entity is an urgent scientific task. In this study, it is solved using a combination of a framework approach and a model analog of the gravitational interaction for the cities of the Volga-Ural macroregion. According to the cost of industrial production of cities with a population of more than 100 thousand inhabitants (i.e., the first and second cities of their regions) and the distance between them, an industrial-urbanized framework of the macroregion was built, demonstrating the potential of economic ties within it. The analysis of the strength of ties allowed us to identify the peripheral and central cities-industrial centers. Among the first ones there are the cities of Orenburg and Penza regions, among the second ones – Ufa, Samara and Tolyatti. In addition, the functions of the second cities of the regions were analyzed and the degree of industrial orientation of the first and second cities of the macroregion was revealed.
Sofya I. Pryakhina, Saratov State University, Anna A. Kotova
Izvestiya of Saratov University. New Series. Series: Earth Sciences, Volume 21; https://doi.org/10.18500/1819-7663-2021-21-3-166-168

Abstract:
The article presents the results of work on the study of synoptic conditions for the formation of a dangerous weather phenomenon for the territory of Western Siberia – a thundersnow. The material for the study was the archive of aerosynoptic material from the Khanty-Mansiysk Air Meteorological Center.
Viktor A. Ogadzhanov, Saratov State University
Izvestiya of Saratov University. New Series. Series: Earth Sciences, Volume 21; https://doi.org/10.18500/1819-7663-2021-21-3-186-191

Abstract:
A method is proposed for calculating the normal compaction curve of rocks for the deep parts of the lithosphere. It is based on the analysis of petrophysical characteristics and interpretation of gravitational anomalies. The main regularities of density changes in the lithosphere of Northern Eurasia are investigated. It has been shown that the density section of the region’s lithosphere is characterized by alternation of paragenetically connected decompacted-compacted (relative to normal compaction) rock complexes at all levels of the lithosphere from the surface layers of bottom sediments to the mantle. These zones of decompacted-compacted rocks complexes have a global distribution.
, Geological Institute of RAS
Izvestiya of Saratov University. New Series. Series: Earth Sciences, Volume 21; https://doi.org/10.18500/1819-7663-2021-21-3-192-208

Abstract:
A detailed description of the Upper Jurassic formations of the south of the European part of Russia, mainly restricted by the Kimmeridgian and Volgian stages, is given. The characteristic of the reference section is provided for the Vechkusy Formation, and the neostratotype is proposed for the Novikovka Formation. The criteria for drawing the boundaries of local stratigraphic units (formations) and the features of strata distribution are considered in detail. It is proposed to change the stratigraphic volume of the Vechkusy, Novikovka and Trazovo Formations, refusing to align the boundaries of the formations with those of stages and substages, and instead to use most clear and widely traced lithological boundaries for defining formations. The Undory Formation, which ends the Upper Jurassic section in the region, includes intervals which differ significantly in their lithologies, and the Kashpir Formation is used here for the area characterized by siliceous sedimentation during the late Volgian. Oxfordian spongolites of the Ulagan Mt. that are sharply different from the coeval strata of adjacent regions ascribed to as Prieltonskaya Member. Despite the fact that isochronous lithological markers are present within the region under consideration, the boundaries of the formations are more or less diachronous, due to both the presence of sedimentary breaks and the temporal sliding of lithological boundaries.
Alla V. Minikh, Saratov State University, Dmitry I. Yankevich, Stanislav O. Andrushkevich, Oleg Yu. Andrushkevich, Ooo Ingeokom
Izvestiya of Saratov University. New Series. Series: Earth Sciences, Volume 21; https://doi.org/10.18500/1819-7663-2021-21-3-179-185

Abstract:
A detailed study of the section of the severodvinsky and vyatsky stages of the Upper Permian with layer-by-layer sampling of ichthyofauna in the western part of the Orenburg region (basin of the lower reaches of the Samara River) was carried out. Based on the fish complexes, a paleontological justification of the stratigraphic boundary between the severodvinsky and vyatsky stages was obtained in the region for the first time.
, Kazan Federal University, Oleg Yu. Andrushkevich,
Izvestiya of Saratov University. New Series. Series: Earth Sciences, Volume 21; https://doi.org/10.18500/1819-7663-2021-21-3-209-217

Abstract:
The article presents the methodology of the representative elementary volume definition for 1 m long whole core segments. Scientific articles focused on factors controlling elastic properties are analysed. Terms of additivity and nonadditivity for physical properties of rocks are discussed. The algorithm of core sampling including drilling out of three perpendicular core samples for estimation of elastic anisotropy was used. Porosity values of 1 m long whole core fragment evaluated in two ways using original core samples in the first approach and core samples having volume 133 cm3 in the second way have been compared. Peculiarities of scale effect of porosity in core samples of limestones are analysed.
Izvestiya of Saratov University. New Series. Series: Earth Sciences, Volume 21; https://doi.org/10.18500/1819-7663-2021-21-3-169-178

Abstract:
The development of the geosystems of the Russian Far East proceeds under the enormous but contradictory in nature double influence of the continent and the ocean and is carried out through the atmosphere. The goal is to characterize hazardous natural phenomena depending on the differentiated natural tension of the Far East (from maximum in the south to moderate in the north), often causing disasters and creating tense levels of the geoecological situation in general. The article presents comparative-geographical, geophysical, informational methods, as well as author’s development, etc. Further strengthening of the natural continentality of the entire region climate predetermines a directed increase in the geosystems development of the role of hazardous natural processes. If a sharp anthropogenic climate warming occurs, an accelerated rise in the level of the World Ocean is possible, which will cause increased abrasion, avalanches and landslides in the coastal zone. In case of a persisting general cooling, a general extremalization of the entire natural environment will occur. Crisis situations are, to a certain extent, predictable, which can help in optimizing rational nature management.
, Saratov State University
Izvestiya of Saratov University. New Series. Series: Earth Sciences, Volume 21; https://doi.org/10.18500/1819-7663-2021-21-2-103-117

Abstract:
Tremabolites sponges known among the Middle-Late Cretaceous beds in Europe are reliably identifiable due to the numerous openings against the background of the skeleton smooth upper surface. The ideas of the level of organization in these sponges and of the species characteristics are far from being univocal. The paper deals with the species diversity of Tremabolites common in the Coniacian – Santonian rocks from the Volga Region. Examples of regeneration and budding in the representatives of the group are presented.
, Jsc “Geologorazvedka”, , Saratov State University
Izvestiya of Saratov University. New Series. Series: Earth Sciences, Volume 21; https://doi.org/10.18500/1819-7663-2021-21-2-118-136

Abstract:
The analysis of the distribution of the Kimmeridgian–Volgian ostracods in the section near the village Valy made it possible to establish a sequence of eight communities, the change of which reflects changes in the ecological conditions in the basin. Changes in sea level fluctuations, the main physical and chemical parameters of the ostracod habitat – temperature, salinity of water, oxygen content in it, eutrophy and concentration of organic matter in sediment – are reconstructed. Information on the magnetic susceptibility and its increase after heating was obtained. Statistically significant relationships between the petromagnetic characteristics and some conditions of sedimentation were established. The conclusion about the relevance of continuing such studies at objects of different ages and genesis was made.
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