Geology

A New Approach to the Derivation of Eikonal for Inhomogeneous Anisotropic Elastic Media

Authors: Aleksandrov P. N.

The proposed new approach to seismic radiation, is based on fixing the amplitude of the displacement vector, reduce them to a system of implicit functions. This allows you to find the functional dependence between the time of arrival of the waves and spatial coordinates. The system of vector equations. The eigenvalues of the matrix in the system are the equations of eikonal. It is shown that for arbitrarily anisotropic and heterogeneous elastic medium, the maximum number of equations eikonal equal to three.

Geological-Tectonic Interpretation of Gravity-Magnetic Information in Development of Regional Geophysical Profiles (for Example: the Profile «Uvarovo‑Svobodniy»)

Authors: Ryskin M. I., Volkova E. N., Sokulina K. B.

The article deals with the results of geological interpretation of geophysical data received during traversing («Uvarovo-Svobodny» line, the length is 376 km). Integrated gravitomagnetic installations alongside were applied during the process of interpretation. The new tectonic elements were found, and previously found tectonic elements were confirmed. More accurate information about location of the border separating the mentioned tectonic elements was obtained. 

Biogenic Migration of Cd, Pb, Ni, and As in the «Soil– Plant» System and Change in Soil Biological Activity

Authors: Pleshakova E. V., Reshetnikov M. V., Lyubun E. V., Belyakov A. Y., Turkovskaya O. V.

The role of agricultural plants in the migration of Cd, Pb, Ni, and As in the soil-plant system and their contribution to decreasing soil metal toxicosis were studied. The influence of heavy metals and arsenic on the enzyme activity of southern chernozem and the restoration of soil biological activity during the elimination of these elements from planted soil were investigated. 

Paleogeographic and Tectonic Environment in the Lower Permian Halogen Formation from the Southeastern Margin of the Russian Plate

Authors: Pisarenko Y. A., Goncharenko O. P., Pisarenko V. Y., Kireyenko O. S., Каrpova T. G.

The Lower Permian halogen formation within the southeastern margin of the Russian Plate is to be considered a large one in terms of its spatial extent, thickness and completeness of halogen sedimentation development. Examination of the halogen formation has made it possible to construct lithology-facies maps of individual salt-accumulation stages and to determine the spatial migration of the salt-generating basin in time.

Earth’s Magnetic Field Evolution During Last 24 mln Years

Authors: Grebenuk L. V.

The history of Earth’s magnetic field during the last 24mln years is considered in terms of our regional magnetostratigraphic Neogene scheme of the southern European Russia and Transcaucasian region. The scheme results from the author’s paleomagnetic studies of base sections in the Caucasian region and bore holes in the northern Cis-Caspian and Lower Volga regions. The revealed inversions of the geomagnetic field are referenced to the stratigraphic scale of the Eastern Para-Tethys. Peculiarities of the magnetic polarity changes in Neogene are analyzed.

Results of the geochemical snow Survey for a local Area of the Territory of the Saratov City

Authors: Reshetnikov M. V., Grebenuk L. V., Smirnova T. D.

Results of the chemical snow survey for a local area of the territory of the Saratov city are presented. It is fixed that composition of water from melted snow is corresponding to water qualitative for fish farming, except of content of nitrogen ammonium. Conclusions on perspectives of snow survey of local areas are proposed. Similar works has an important role in educational process of students, studying ecological disciplines. 

Demonstration of Gemmation among Cretaceous Skeletal Sponges – Hexactinellida

Authors: Pervushov E. M.

The examination of the modular organization in fossil skeletal sponges (Hexactinellida) is mainly related to a study of their vegetative reproduction. The concepts of the reproductive forms for both Recent and Mesozoic hexactinellids can be ambiguous. Examples of the skeletons of fossil sponges from the Late Cretaceous of the Volga River basin, with morphologically detached and naturally distributed sprouts interpreted as buds, are shown. 

Petromagnetic Effect of an unsoluble residue distribution in the sylvinite Layer Section of the Gremyachinskoe Deposit

Authors: Moskovsky G. A., Guzhikov A. Y., Reshetnikov M. V., Sorokin A. S., Svidzinskiy S. A.

The article presents results of the detailed petromagnetic analysis of the core samples of the potassium salts of the Kungurian potassium salt complex in the Gremyachinskoe deposit (Volgograd region), which allowed for obtaining additional information on the stratigraphic rhythmicity and for substantiating the correlation levels.

Lithologic-petrophysic Characteristic of Ardatovsk Horizon’s productive Collectors of the Splavnukha’s oil Field

Authors: Golovin B. A., Golovin K. B., Kalinnikova M. V.

In this article we had proved criteria of definition of productive collector’s effective thicknesses, porosity, shaliness and petrosaturation. We had revealed their features of vertical and lateral distribution. 

Geological Museum – a historical Component of the Saratov State University

Authors: Pervushov E. M., Andrushkevich S. O.

Private collections of rocks and minerals from the vast of the Ural Mountains and Kirghiz plains known in Saratov from the second half of the XIX century, by the beginning of the XX century have been concentrated in the vaults of Radishchev Fine Art Museum. Later on, some of them joined the collections of the geological cabinet at the Saratov State University.

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