Geology

The Content of Mobile Forms of Heavy Metals in a Soil Cover of the City Park of Volsk Town

Authors: Sheshnev A. S., Eremin V. N., Prokofieva E. V., Reshetnikov M. V.

The soil cover in the territory of the recreational zone «City Park» located in the central part of the Volsk town of the Saratov region is investigated. The assessment of a current sanitary and hygienic and ecological and geochemical state of soils is executed by results of the analysis of concentration of mobile forms of heavy metals. Excess of threshold limit values on nickel, copper and zinc is established.

Lithogeochemical Properties оf Terrigenous Rocks of Sortymsky Suite of Pyakyakhinskoye Field (North of Western Siberia)

Authors: Titov Y. V., Astarkin S. V., Goncharenko O. P., Kolpakov V. V., Guduchkina O. V.

The article represents lithogeochemical characteristics of rocks of sortymsky suite. It is revealed that the rocks belong to sellitem and the hydrolysates, the values of Sodium Module and Potassium Module indicates on sediments of greywacke containing hydromica, chlorite, plagioclase. Degree the maturity received by a thin pool alumosilicates was moderate (CIA < 70). Sortymsky the basin was characterized by shallow depth with an increase in salinity of the East to the West.

Auutygenic Dolomite High-сarbon Radials Bajenovskaya Switches – Indicator of the Regime Active Singenic Naptidogenesis

Authors: Korobov A. D., Akhlestina E. F., Korobova L. A., Loginova M. P., Kolotukhin A. T., Mukhin V. M.

The article is devoted to the role of algal material of the Bazhenov suite in the the formation of authigenic dolomite. Authigenic dolomite could form in the environment of convergence of two processes: hydrothermal («wedging out» in the rear zones) and catagenetic (background) generated by conductive heat transfer. The development of the algal dolomite in situ shows that the source rocks experienced the stage of intensive (final) hydrocarbons generation.

First Magnetostratigraphic Data on the Maastrihtian of Mountain Crimea (Bakhchysarai Region)

Authors: Gujikova A. A.

The representative data about magnetic susceptibility, its anisotropy before and after heating up to 500°C and other petromagnetic characteristics were received on two sections of carbonate sediments of Maastrihtian – Chahmahly and Takma, located in Bakhchysarai region of the Republic of Crimea. In the studied sections there were established the magnetozones of normal and anomalous polarity, the comparison of determined zones with Geomagnetic Polarity Time Scale was conducted.

On the Stratigraphic Significance of Elasmobranchs (Chondrichtyes, Elasmobranchii)) in the Cenomanian of the Volga River Basin (Right Bank)

Authors: Biryukov A. В.

The paper analyzes the stratigraphic distribution of elasmobranchs in the deposits of the Melovatka Formation (Cenomanian) from the right bank of the Volga (part of the Penza, Saratov and Volgograd regions).

Secondary Terrigenous Screens of the Tyumen Switch – Reliable Factor of Preservation of Productivity Bazheno-аbalak Complex

Authors: Korobov A. D., Akhlestina E. F., Korobova L. A., Gordina R. I., Loginova M. P., Kolotukhin A. T., Mukhin V. M.

Reliable isolation of the Bazhenov-Abalak complex of the Krasnoleninskoye field, ensuring its productivity, was provided by the appearance of secondary (hydrothermal) screens in underlying rocks of the Tyumen Suite. This was reflected in the sealing of the intergranular space of sandstones, silty sandstones and other rocks of the Tyumen suite with regenerative quartz, minerals of silica, and rarely sulphates and carbonates.

The Anomalous Lithosphere and the Oil and Gas Potential of the Precaspian Depression

Authors: Richter Y. A.

The lithosphere of the Precaspian depression is characterized by abnormal ratios of the super-thick sedimentary cover and the thinlayered suboceanic crust, as well as anomalous structure of the decompacted upper mantle. The classic models of isostatic equilibrium for the Precaspian depression are insufficient and applicable only to a first approximation.

New Data on Magnetic Properties of Upper Paleozoic Deposits in the South of Precaspian Depression

Authors: Pronin A. P., Guzhikov A. Y., Surinskiy A. M.

The magnetic properties of igneous and sedimentary rocks of Lower Carboniferous and Upper Permian, were studied in the core samples from the boreholes, situated in the south of Precaspian depression. The volcanic rocks of Lower Carboniferous are characterized by low (first decades 10-5 SI units), and Upper Permian – by high (hundreds and first thousands 10-5 SI units) values of volume magnetic susceptibility.

The Petrophysical Survey of Radioactive Logging for Interpritation (in South-West Part of Pribortovaya Zone Prikaspiy)

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

In this article was studied clayiness of key bed of Aleksinskie depositsof Severo-Limanskaya region. It was executed 14 analyses of big collection of mineral aggregateusing X-ray analysis. It was received quantity relations clayiness and silty parts in key clayiness beds. It was calculated qualified significances of hydrogen index for examined key bed, using known valuesof hydrogen content of basic clayiness minerals.

What is the «Anthropocene»?

Authors: Sheshnev A. S.

The unofficial term ≪Anthropocene≫ is used actively to refer of the era of the global role of mankind in changing of the environment. Its beginning was announced at the International Geological Congress in 2016. Earlier geologists abstained from this discussion, and representatives of other Earth and Life sciences prevailed among supporters of anthropocene’s idea. In the near future, the introduction of the anthropocene in the geochronological scale will be of current interest.

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