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Moscow University Bulletin. Series 4. Geology

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No 2 (2019)
View or download the full issue PDF (Russian)
https://doi.org/10.33623/0579-9406-2019-2

3-7 184
Abstract

Outlines the history of the formation of layered geological formations at MSU. The features of independently established educational standards and curricula at the geological faculty of Moscow state University are considered. The difficulties encountered in the formation of the structure of educational standards, curriculum development and transition to the system of credits are analyzed. Questions of formation of structure of educational process in a magistracy on the basis of master's programs, instead of on profiles of preparation, as in a bachelor's degree are brought up.

8-16 219
Abstract

The article presents the results of the structural-geomorphological analysis of the Heraklion peninsula of the South-Western Crimea. The Western, Central and South-Eastern segments are distinguished, differing in density and direction of fracture zones, faults, the nature of the ravine-gulch net, and the structure of the coastal zone. It is shown that neotectonic movements in the upper structural floor are most intensively manifested over the Late Jurassic-Early Cretaceous collisional suture formed when the back-arc basin with the oceanic crust was closed.

17-22 193
Abstract

Faults in the quarterly deposits established during field investigations indicate that seismic events with magnitude of no less than 5 occurred in the Northern Ladoga region during neotectonic time. Computer modeling has shown that the modern seismicity of this territory is associated with the neotectonic activation of Precambrian disjunctive structures in conditions of NW compression. Relief analysis allows us to distinguish faults limiting the basin of the Ladoga Lake, which belongs to active neotectonic structures.

23-29 203
Abstract

The structural features of the Katavsko-Yuryuzan faults zone are considered. According to the analysis of mesostructures, paleopole stresses, where horizontal northwest compression prevailed, were determined. Data on earthquakes, that occurred in September 2018 near the town of Katav-Ivanovsk, has been analyzed. Contradictions in determining the coordinates of epicenters and mechanisms of earthquakes foci calculated by different geological services were revealed. It is shown, that the situation of right-sided transpression, in which the structure of the northwestern part of the Bashkir meganticlinorium was formed, continues up to the present moment.

30-38 247
Abstract

On the basis of detailed, combined rock-magnetic, lithological, and micropaleontological study of the Mikhailovtsement section of the Moscow syneclise (Ryazan region), the fluctuations in Central Russian Sea level in Callovian–Early Oxfordian were reconstructed. According to the variations of rock-magnetic parameters over the section, seven rock-magnetic intervals were established which correspond to different stages of basin evolution. These stages are compared with sea level fluctuations established on the basis of changes in the lithology of rocks and the ostracod complexes. In general, the nature of sea level change in Callovian–Oxfordian, revealed by combination of the methods during the study of Mikhailovtsement section coincides with global trend.

39-45 188
Abstract

The paper presents a study of the structure and reservoir properties of rocks of the Bazhenov formation in the sections of three wells located in different structural zones of the Priobskoye field. It is shown that the porosity of the samples varies from 0.02% to 6.95%, the absolute gas permeability of the rocks reaches 1.364 mD. It is established that the collectors in the Bazhenov formation are confined to silicite-radiolarites (possessing porosity associated with the leaching of radiolarian shells) and kerogen-clay-siliceous rock and kerogen-clay silicite (porosity is associated with the release of space between the clay-siliceous matrix and kerogen by ripening organic matter). The following secondary processes influenced the formation of voids in these lithotypes: recrystallization of radiolarians and local warming up.

46-56 285
Abstract

One of the most famous and promising shale formations in Russia is the Bazhenov formation. The ambiguity of ideas about its geological features, caused by the complex, heterogeneous structure of the strata, attracts the attention of many researchers. In this work, the Bazhenov formation is singled out in conjunction with its stratigraphic counterparts in the Bazhenov high-carbon formation (BVCHF). In this were considered the main characteristics of its allotment and distribution over the area, as well as the geological structure. Being an unconventional reservoir of hydrocarbons, BVCHF has properties of a petroleum-bearing rock, one of the main characteristics of which is organic matter, its type and maturity. The paper presents the results of the study of organic matter by various methods at the micro level, as well as their integration with larger-scale studies. The need for detailed consideration of the organic matter of the BVCHF is justified by the fact that it has a mixed composition and, as a consequence, a different degree of transformation and spatial distribution.

57-69 194
Abstract

The analysis of Bazhenov high-carbon formation organic matter catagenesis zonal distribution in connection with its own reservoir’s organic matter porosity made in this work. Realized research helped to articulate regional prospecting criteria for oil deposits in Bazhenov’s formation unconventional reservoir with organic porosity.

70-82 199
Abstract

Testing of modern innovation field methods of engineering-geocryological research, master class workout by leading specialists of engineering-geocryological surveys, checking out of measurement equipment for thermal field ground massif researches which were done at “The day of science and innovation” field conference in Zvenigorod biological station of Lomonosov Moscow state university. Necessity of innovation methods usage has approved.

SHORT MESSAGES

83-87 152
Abstract

The article describes a method of calculation of point source’s parameters from the gravity field, measured on a sphere. Conclusions about the conditions for the practical application of the developed method are drawn on the basis of a comparison of the results of spherical source coordinates and mass estimation by a field given on the plane and on the sphere.

88-93 258
Abstract

A two-dimensional density modeling is performed for profiles crossing the seamounts of the Conrad Rise (Lena, Ob and Marion Dufresne), which are located in the southwestern part of the Indian Ocean and the Afanasy Nikitin Rise, which is located in the central part of the Indian Ocean. According to the assumptions of a number of researchers, the seamount Marion Dufresne and the Afanasy Nikitin Rise were formed as a result of the hotspot 83–73 million years ago. The results of two-dimensional density modeling showed a similar structure of the crust and lithosphere, which confirms the probability of their formation 83–73 million years ago as a result of the action of a single hotspot. Also on the basis of the obtained results, the assumption is confirmed that the seamounts Lena and Ob of the Conrad Rise were formed afterwards due to the continuation of the action of the hotspot under the Antarctic Plate.

94-103 268
Abstract

The paper presents the results of a detailed petrological study of olivine gabbro transformed to different extent by eclogite-facies metamorphism. Textural features of cumulate crystallization in the rock are presented. Plagioclases underwent the greatest alteration and replaced by finegrained aggregate during eclogite-facies metamorphism. Corona textures are developed along the boundaries of the plagioclase (felscic) domains at the contacts with (Fe,Mg)-minerals during eclogite facies event. The mineral thermobarometry and phase equilibrium modeling provide P-T metamorphic conditions in relatively narrow range of temperature 680±60 ᵒC and pressure Р=2,2±0.4 GPa. This is in a good agreement with the previously established conditions for the formation of eclogites and garnet-amphibole peridotite from the same complex.



ISSN 0579-9406 (Print)