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Proceedings of higher educational establishments. Geology and Exploration

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No 6 (2017)
https://doi.org/10.32454/0016-7762-2017-6

MAIN EDITOR’S COLUMN

GEOLOGY

7-17 914
Abstract
Five adjacent eco-stratigraphic units have been considered (listed here, from the bottom to the top): eco-zones Cordaites clercii ... Abiella subovata (7 dominants of the plain sedtmentation level), Quadrocladus pachyphyllus ... Bipemphigus gennisi (29 dominants of the mountain, plain, lowland sedimentation levels), Quadrocladus pachyphyllus ... Echinolimnadia mattoxi (15 dominants of the plain sedimentation level), Elatocladus linearis ... Cornia vosini (13 dominants of the mountain, plain, lowland sedimentation levels), eco-series Ferganiella ... Cornia vosini (11 dominants of the plain and lowland sedimentation levels). The lower eco-zone belongs to Vishkilian (Severodvinian) stage (Upper Permian), the upper one - to the Triassic. The age of the deposits included in the other eco-zones, has been discussed. A complete set includes dominants of the arborescent layer, slope herbaceous cover, lowland herbaceous cover, standing basins, semi-flowing water basins, flowing water basins, coastal basins of mountain, plain, and lowland levels. In the names of the eco-zones the dominant of the arborescent layer of mountain (or plain) level is written to the left, flowing water (or coastal) basin of the lowland level is to the right (through the dot). Eco-zones clearly differ from each other in the composition of the dominants. The clearest boundary is the boundary of the two upper eco-zones. The boundary of the two lower eco-zones is less clear. The least clear boundaries are the boundaries of the eco-zones Quadrocladus pachyphyllus ... Bipemphigus gennisi, Quadrocladus pachyphyllus ... Echinolimnadia mattoxi, Elatocladus linearis . Cornia vosini. It may be prompted to include these three eco-zones in the Taimyrian region-stage, returning its originally suggested volume. It corresponds to the zones from the Clarkina bachmanni to the Stepanocites mostleri.

USEFUL MINERALS, METHODS OF THEIR PROSPECTING AND EXPLORATION

18-29 464
Abstract
Basing on the structural-formational complexes study of the one of the largest in the world South Tien Schan gold ore province, the new conclusions of the spatial-temporal interrelation of the ore mineralization types, presented in it, have been done. The author’s perennial field works data and results of the cameral processing of the rock and thin sections collected by him have been used. Due to the intensive processing of the main deposits, described in the paper, a state of the excavations has been altered a lot, the observations, made earlier, have more significant meaning and deserve the acquaintance of the specialists.

HYDROGEOLOGY AND ENGINEERING GEOLOGY

30-34 764
Abstract
The hydrogeological features of the central part of the Moscow artesian basin (MAB) under the natural conditions provided the existence of the downward vertical flows of the groundwater, the formation of the fresh underground waters of the Carboniferous complex, desalination of the Upper Devonian subterranean waters. The long exploitation of the Aleksin-Protvino horizon in the central part of the MAB led to the formation of a depression of the piezometric level with a depth of 80 m, as well as a change in the ratio of the absolute marks of the piezometric surfaces of the groundwater of the Lower Carboniferous and the Upper Devonian, and the creation of prerequisites for the changing of the orienfafion of the vertical wafer exchange between them. A map of the difference in pressures between the Aleksin-Protvino and the Upper Devonian horizons, compiled by the author, shows this situation. In a vast zone of the central part of the MAB, the pressure surface of the Alexin-Protvino horizon is 30-50 m below the upper Devonian horizon. Under these conditions, it seems important to study the Upper Devonian aquiferous complex as a possible source of the «contamination» of the groundwater of the Lower Carboniferous, especially in the zones of active lineaments of the Moscow syneclise.
35-41 419
Abstract
A method of the estimating the variability of the physical and mechanical characteristics of soils has been considered. The applying of this method in practice can be used to find out the weakened zones and tectonic structures at the territory of the atomic power stations, and also - traditionally - to estimate the influence on the behavior of the elementary natural technical system «construction - soils». The tasks of the revealing the character of the occurrence of the various possible structural non-homogeneities, which may influence on the atomic power station territory estimation, as well as a general plan allocation, have been estimated in geological parameters fields’ assessment at the one of the constructed atomic power stations territory and environs. The characteristics of the physical properties (humidity, density, zero-air dry unit weight, index fluidity) have been compared on the base of the analyses of the laboratory tests. The analysis has been done for a layer-marker which corresponds to the chalk deposits of the Turonian stage. A selective analysis of the dimensional variability of the soils’ properties has been done for the engineering-geological researches results on the territory of the atomic power-station and, in particular, reactor divisions. It has been concluded, that to make a right forecast, the additional engineering and geological investigations of the atomic power station are needed. Such researches will allow the sustainable definition, or confirmation, of the existing deformation and strength properties of the soils which are in the basement of the buildfngs for the depth, which is deeper than compressible thickness depth.

GEOPHYSICAL METHODS OF PROSPECTING AND EXPLORATION

42-48 386
Abstract
A 2D geoelectric model of a heterogeneous geological medium has been developed taking into account the processes occurred in the geological subj ect of flexure type which transforms into an uplift-thrust structure as a result of deformations. The model is based on a hypothesis of the variation of electrical conductivity of geomaterials in the local area of the fault under subcritical stress-state conditions due to the geodynamical processes. In the shear stress maximum area, in the plane of fracture of the uplift-thrust type, a zone of increased fracturing is developed contributing to the essential decrease of electric resistance due to filling the fractures by fluid - so named «conductive split». A numerical simulation has demonstrated that when transiting from the quasi-stratllied model to a 2D model with the high-resistive shield a redistribution of the total current density in the medium is increased essentially due to the effect of the «conductive split», taking into account the assumed formation of the zone of fracturing. In this case, amplitude of the electromagnetic (EM) field for the longitudinal polarization increases far apart from the area of the «conductive split». The result obtained may be applied as a background for the development of the monitoring technique of the electromagnetic fields measured on a surface of the Earth far apart from the earthquake epicenter and directly over the fault for the controll ing of a level of the fault maturity for the occurrence of the seismic event.
48-54 456
Abstract
On the 16th of April, 2016, a strong earthquake with M 7,3 occurred in the Kumamoto prefecture (Kyushu, Japan). This earthquake is the strongest in the last 30 years in this area. For a day before the main shock, two foreshocks with M 6,4 were registered. For seven days after the main shock, aftershocks activity spread to the north-east and south-west, most of the hypocentres of the aftershocks with M 6,4 were localized within the seismogenic layer in the depth interval from 5 to 10 km. The authors have modeled a stress-strain state (SSS) of the epicentral area be fore the earthquake and after it (after the formation of the main fault). For this purpose, a software package is used, that allows 2-D formulation (plane strain condition), for modeling SSS block heterogeneous geological environment, disrupted by a system of tectonic faults. The faults are modeled in the form of extended zones of the dispersed geomaterial, which elastic modulus are significantly lower than the elastic modulus of the environmental media. A structural-tectonic scheme of the Kumamoto earthquake area is used. An analysis of the results of SSS modeling has been done for the area 30x40 km before and after the earthquake. It is shown that the area and magnitude of the stress intensity in anomalous zones are the predictive signs of the location and intensity of a possible strong crustal earthquake, and the vector of the rapid decrease in the potential energy of deformation could be a guide for the most probable direction of tectonic rupture during a crustal earthquake. The results received can be useful in a deterministic approach to seismic hazard assessment and carrying out the geophysical observations focused on the forecast of the strong crustal earthquakes in the continental areas.

GEOECOLOGY

55-61 379
Abstract
The results of testing the author’s methods for assessing the comfort of the life activity in the mining areas, located in the zone of permafrost rocks, have been given by the example of the mining complex of the territory Aikhal as a typical exploration and mining activities model obj ect in the area of the dissemination of the permafrost. It has been revealed that the maximum discomfort is created by the mining and processing works, as well as exploration. An area with the very uncomfortable conditions of the life is connected to the location of the diamond pipes Aikhal, Sytykan and Jubileinaya. In the area of the exploration zones, the very uncomfortable and uncomfortable living conditions are formed. A minimal impact on the all components of the environment is observed in the area of the exploratory work where the arbitrarily comfortable living conditions are fixed. The areas, in which there are no any kinds of the anthropogenic impact on the natural geo-ecological components of the environment, have been evaluated as comfortable.

BRIEF REPORTS

62-67 352
Abstract
Rhyncholites of the Arcuatobeccus subgenus represent a big group, counting about 25 species and known from the Western Europe, Mountain Crimea and also San-Salvador Island. A stratigraphic distribution of the Arcuatobeccus covers an interval from the Middle Jurassic up to the Middle Cenomanian, inclusively. In the Mesozoic deposits of the Mountain Crimea, Arcuatobeccus are not popular and distributed in the section unevenly. To the last moment four Cenomanian species of Arcuatobeccus were known there. A Lower Cenomanian complex included H. (A.) alekseevi Komarov, H. (A.) ratus Shimansky и H. (A.) selbuchrensis Komarov. In the Middle Cenomanian complex, a one species of Arcuatobeccus was found - tiny H. (A.) prima Komarov. It is important to note, that the Middle Cenomanian Arcuatobeccus have not been known anywhere else in the world yet. The paper illustrates a new Lower Cenomanian species of Arcuatobeccus, found in 2017 during the Crimean training geological practice of MGRI-RSGPU. It differs from the closest species Hadrocheilus (Arcuatobeccus) selbuchrensis by a bigger size, shorter and narrower handle (in relation to the hood) and sharper, knee-like transition of the hood to the handle. The results of the detailed study of the bearlng-rock have been shown.
68-73 388
Abstract
A dual model of the Paleozoic basins development, disposing on the Late Proterozoic (Pan-African) and the Early Proterozoic (Eburnean) crust, has been proposed. The formation of the first group basins is connected with the subsiding of the sections of the cooling gneissic-domes of«rejuvenated» (Early Precambrian but tectonically reworked at the end of the Proterozoic) Pan-African crust. Accordingly, the development of the second group basins is a result of the Precambrian deep sited (mantle) magmatic chambers cooling and subsiding together with the sites of the old lithosphere, covering them. The manifestation of the Vendian volcanic units on Anti-Atlas, Ugarta, Regibat-Eglab uplifts is the most possible evidence of the mantle magmatic activity, which could create those chambers.
73-78 407
Abstract
A brief review has been made to the memory of the untimely and suddenly gone from us, leading expert of the Russian gold ore deposits, M.M. Konstantinov. Using of his materials during the further exploration of the three large domestic deposits (Bamskoe, Mnogovershinnoe and Olcha) has been shown to be able to help to increase gold resources.


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ISSN 0016-7762 (Print)
ISSN 2618-8708 (Online)