No 5 (2017)
GEOLOGY
5-12 506
Abstract
A new chronostratic scheme of South-East (SE) Fennoscandia has been developed, based on the International Stratigraphie Scale, taking into account some elements of the Common Stratigraphic Scale of Russia and the regional stratigraphic scheme of the North-West (NW) of Russian Federation. A rank of Archean and Proterozoic stratons has been determined (including supersystems for Riphean and Archean geonotems), compatable in dutation to the Phanerozoic systems (Mesozoic and Paleozoic ones). An original coloring for the geological maps of the newly allocated systems and their analogues in the Precambrian, as well as the digital indexing of all stratons of the rank of systems instead of the traditional alphabetic one, have been proposed. Based on the extensive geological materials of the Institute of Geology of Karelian Research Centre of the Russian Academy of Sciences, in view of the new approaches and reliable geochronological data, an areal geological map of SE Fennoscandia in scale 1: 750 000 has been created, which includes the territory of Karelia and adjacent areas of the Russian Federation and eastern Finland. The proposed chronostratic scheme can serve as a basis for developing legends of small-scale state geological maps of the new generation, especially in the regions of the Precambrian development.
13-19 560
Abstract
The morphostructure of an crest part of the Voronezh anteclise is closely related to the neotectonics of the territory. A feature of the newest structure, in contrast to the Paleozoic, Mesozoic and Paleogene structures, is predominantly the submeridional orientation of the interchanging raised and downdip blocks. The following regularities of the degree of the reflection of the deep inhomogeneities in neotectonic and geomorphological characteristics have been revealed. The zones of the reduced density at the top of the mantle have been noted to be corresponded in general by neotectonic blocks with the elevated relief. Areas of the high density values in a number of cases are corresponded by the Neogene-Quaternary blocks of the second rank with the reduced values of relief depth marks. Both of the relationships of the thickness of the earth’s crust and the height of the relief, negative and straight, have been observed. A complete spatial correlation between these parameters has been not observed, but on the whole, the structural plan of the Neogene-Quaternary structural-material complex is consistent with the spatial location of large heterogeneities in the litho sphere.
MINERALOGY, PETROGRAPHY, LITHOLOGY
20-26 391
Abstract
The first results of the mineral-petrographic studies of microclastes of kimberlites from the basal horizon of the Upper Paleozoic deposits of the Alakit-Markhinsky kimberlite field (Western Yakutia) have been presented. The main features of the indicator minerals of kimberlites (IMK) have been revealed. These minerals are picroilmenite, pyrope, chromspinels, phlogopite, chromdiopside and olivine. The ways of their further studying in connection with the search for kimberlite bodies have been outiined. The opening of the Yanvarskaja pipe has confirmed the correctness of the methodology for testing the basal horizons of the Upper Paleozoic deposits on the core of the wells. Minerals containing rare-earth elements (REE) have been found in the kimberlites of the new tube, which requires further research. The results of the study of the IMK of Yanvarskaja pipe serve as a supplement to the database on the Alakit-Markhinsky field and allow more reliable prediction and identification of new objects, including high-diamond ones.
PROVENANCE AREA OF PRECAMBRIAN QUARTZITE-SCHIST SEQUENCES OF THE KOKCHETAV MASSIF (NORTH KAZAKHSTAN)
27-39 416
Abstract
The results of a study of quartzite-schist sequences of the Prevendian basement of the Central and Western parts of the Kokchetav massif in the Northern Kazakhstan and ore placer deposits, confined to them, are provided. An accumulation of the both formations took place in the shelf part of the passive margin of the large continental block. Petrological and geochemical characteristics as well as the compositions of the rutile and tourmaline from palaeoplacers indicate that the clastic material came from a one distributive province. The rocks metamorphosed under the moderate and high temperatures, metasedimentary and metabasic complexes had an important role in the structure of the distributive prov-nce with the less significant role of the felsic magmatic rocks.
USEFUL MINERALS, METHODS OF THEIR PROSPECTING AND EXPLORATION
40-51 498
Abstract
The gold ore chimneys of 2 types have been shown to be developed at the near-surface deposits of gold and silver ores. These types are: 1 - bulk ones, of the vein-nested-veinlet ore bodies of stockwork shapes and 2 - small pay streaks of the ore bodies, appeared either in single veins or in the veins, being a part of the wide ore bundles. The example of the first type is the Central ore column of Balei deposit and the column of the Glavnaya (Main) vein of the Karamkenskoe deposit. A deiailed analyses of the graphic material, made by N.V. Petranovskaya for Balei deposit, confirms, that under the bottom of the ore controling vein №2 in the vertical interval from 100 to 250-350 m the rich ores can be prevailed in the zones, which are likely to join with ore bodies of Taseevsky site. The discovery of the new bulk gold ore chimnies is likely to be there. With this, an additional exploration of the south-east flanks of the Balei deposit is needed, that can lead to the discovery of the new bulk gold ore chimnies.
52-57 490
Abstract
A wide range of the temperatures of hydrothermal fluid regime (430-103 °C) has been revealed in the result of microthermometric study of the fluid inclusions in the minerals of pre-ore and post-ore stages developed at the Elkon deposit. Average temperatures, as well as the temperature variation are similar for both pre-ore and post-ore stages. It allows sure determination of temperatures of uranium ore formation as 400-120 °C. Fluids possessed Na-chloride, rarely Na-chloride-carbonate composition and moderate salinity (6-16 wt. % · NaCl equiv.). The wide range of tem-peratures confirms an assumption made before that various temperatures were the reason of formation of uranium mineralization both in the form of predominantly amorphous phase (U-Ti-metagel), as well as the rarely crystalline form (brannerite). Abrupt temperature decrease was apparently the main factor of the ore precipitation.
GEOECOLOGY
58-64 484
Abstract
The lithotechnical, natural-technical, and geoecological, rarely - natural-technical geoecological systems (NTGES), which refer to the material type, are the most popular in the geoecological research, according to the their purpose. Under the conditions of cryolithic zone of Western Siberia, one of the most dangerous NTGES is a system «objects of the gas transportation - environment», as it includes all the components of the environment and complex transportation infrastructure, which provides the main transportation of the gas and ties together the individual components of the gas complex, including the surface and underground pipelines, compressive and pumping stations, assosiated power lines and communication, storage, warehouses and domestic premises and others. A complexity of the NTGES’s behavior definition is in ability to see all thesystem in a whole, not breaking it in the components, for this it is reasonable to find the measure of its emergence.
64-72 606
Abstract
The equivalent dose rate of gamma radiation of the resort cities of the Caucasian Mineral Waters (CMW) region has been estimated. During the radiation-ecological monitoring in Zheleznovodsk, anomalies have been found in which the measured values were very different from the rest. For most of the area studied, the dose rates of the gamma radiation have been established to meet the requirements of the sanitary rules and hygienic standards. As a part of the assessment of the ecological state of the urban area, the radio-geochemical studies of the soils of the resorts of the CMW have been carried out, according to which the concentrations of the long-lived technogenic radionuclides137Cs and90Sr have been established. The results of the monitoring indicate that the maximum radionuclide concentrations have been recorded in the soils of Zheleznovodsk, where their average values exceed the corresponding values for Russia by 4 times for137Cs and 13 times for90Sr. The minimum concentrations of137Cs and90Sr are characteristics of the soils of Kislovodsk. According to the content of137Cs and90Sr soils, a dangerous level of the soil contamination is prevailing in Yessentuki, an extremely dangerous one - in Zheleznovodsk, a moderately dangerous one - in Kislovodsk. The obtained results testify that with the environmental assessment of the territory of the CMW region, the application of the evaluation criteria without taking into account the radiation situation can lead to a false conclusion about the magnitude of the anthropotechnogenic load. Based on the information received, a conclusion has been made on the need for further radioecological observations in this region.
GEOLOGIC AND PROSPECTING EDUCATION ISSUES
73-77 1015
Abstract
The problems of the contents and methods of the teaching of the training course «Geotectonics and geodynamics» in the geological high schools of Russia have been discussed. The meaning of the classical works of the Russian scientists and their role in teaching has been considered. The recommended classification of the current multirange tectonic structures of the continents and oceans has been shown. The «Tectonic codex of Russia», edited recently, has been critically considered. An inability to use it in the learning process has been prooved.
BRIEF REPORTS
78-81 425
Abstract
A structure of the natural-technical system (PTS) «Tailings dam» of the iron-ore deposits - decomposition on the categories with different character of the connection processes has been considered. Elementary PTS «Tailings dam» may be allocated into five zones: aerodynamical influence, differentiation of effluent (colmatage), filtration of industrial water (dispersion of dome), zone of chemical components migration, a zone of consolidation, suffusion and gravitation processes. A long standing exploitation of the deposits change boundaries, regimes and set of the processes. It requires permanent correction of the dislocation of the information systems points,as well as of regime and monitoring parameters. Optimal functioning of PTS is provided by control methods, based on the information about theseprocesses.
CHRONICS
ISSN 0016-7762 (Print)
ISSN 2618-8708 (Online)
ISSN 2618-8708 (Online)