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A COMPARATIVE ANALYSIS OF PYRITE-BEARING VOLCANOGENIC FORMATIONS OF THE BLAKSKY ZONE AND THE EAST URAL UPLIFT
Currently, in Orenburg Oblast, as well as in the Urals as a whole, there is a great need for the reproduction of copper ore reserves as a result of the intensive and prolonged development of large pyrite deposits. In light of this fact, there was a need to re-evaluate the promising areas for pyrite mineralization; however, there are many insufficiently studied areas, which include the Blaksky zone. The aim of this study is to identify the features of copper-crusted mineralization of the Blaksk structural-formation block of the East Ural trough. The provided data on the localization levels and evolution of pyrite mineralization of the East Ural trough on the example of the Blaksky deposit show an increase in the content of lead and zinc in relation to copper from the lower tier to the upper, as well as laterally in the eastern direction. The data confirm this pattern in comparison with the deposits of the East Ural uplift. The same pattern is typical for the East Ural deflection. This allows the authors to consider this territory as promising for pyrite polymetallic mineralization.
Read MoreON THE CHEMICAL PROPERTIES OF CLINOPYROXENE IN THE DIKE COMPLEXES OF THE KATSDAG-KEKHNAMEDAN ZONE IN THE EASTERN SEGMENT OF THE GREATER CAUCASUS
The article examines the typomorphic features of pyroxenes in rocks of the Katsdag-Kehnamedan zone dyke complexes of different ages in the Eastern segment of the Greater Caucasus based on the results of microprobe and microscopic studies. It is established that in all varieties of rocks of dyke complexes of different ages, pyroxenes are represented by augite and less often by magnesian augite, they are characterized by low titanicity and alumina content. However, it should be noted that clinopyroxenes in rocks of different age are characterized by specific features due to the thermodynamic regimes of their formation. They also reveal the complex nature of the formation of dyke complexes, which differ in the physicochemical conditions of the evolution of a mafic melt with a characteristic ore specialization.
Read MoreLIQUIDATION OF POLLUTION OF GROUNDWATER AND SOILS WITH OIL AND OIL PRODUCTS (EXAMPLE OF THE REPUBLIC OF BELARUS)
The article investigates the elimination of pollution of groundwater and soil petroleum products, by the example of Ishimbai in the Republic of Bashkortostan.
Read MoreTHE EFFECT OF INSOLATION ON THE BIOACCESSIBILITY OF DISSOLVED ORGANIC MATTER AND RELATED METALS IN THE WATER OF THE SENGA RIVER
Dissolved organic matter (DOM) plays an important role in the chemical composition of natural waters of boreal ecosystems. The main factors of DOM transformation are sunlight and the microbial complex.
Conducting a full-scale experiment with the water of the Senga River allowed for identifying the effect of insolation on the biodegradation of the initial dissolved organic matter and related metals. The study demonstrates that mainly low-molecular compounds undergo biodegradation. During insolation, about a third of the DOM passed into a higher molecular weight form (>0.22 microns) or was mineralized to CO>2 and HCO3-. As a result of photo-and biodegradation, large (>0.22 microns) organo-mineral compounds are formed as iron hydroxides, stabilized humic substances, with which Al, V, Mn, Co, Cu, Zn, Cd, Pb can also be co-deposited. At the same time, the content of low-molecular (<1 kDa) and therefore more bioaccessible compounds Co and Ni are observed to be on the increase.
Read MoreGEOLOGICAL AND FIELD JUSTIFICATION OF TECHNOLOGICAL, TECHNICAL AND ECONOMIC CRITERIA FOR THE DEVELOPMENT OF CENOMANIAN GAS DEPOSITS IN CONDITIONS OF REDUCED RESERVOIR PRESSURE IN THE URENGOY GAS FIELD)
Due to the increasing depletion of oil fields over the past two decades, the primary task of fuel and energy companies is to assess the criteria for determining the effectiveness of the development of Cenomanian gas deposits in reduced reservoir pressure. There are technological, technical and economic criteria for development.
This article discusses the geological and field justification of technological and technical and economic criteria for the development of Cenomanian gas deposits in conditions of reduced reservoir pressure using the Urengoy gas field as a primary example.
The purpose of this article is to analyze the technological, technical and economic criteria for the development of Cenomanian gas deposits under conditions of reduced reservoir pressure.
The current research has the following objectives:
– characterize the criteria for the development of Cenomanian gas deposits in conditions of reduced reservoir pressure;
– develop a methodology for assessing the development of Cenomanian gas deposits in conditions of reduced reservoir pressure.
The practical significance of the article lies in the fact that the study can be used to justify the technological, technical and economic criteria for the development of Cenomanian gas deposits in conditions of reduced reservoir pressure.
Read MoreON THE OIL AND GAS POTENTIAL OF THE GULF OF GUINEA SHELF
This article examines such important aspects of the industry as the development of hydrocarbon deposits of the Gulf of Guinea shelf. Hydrocarbons are considered the most important resource for the industrialization of countries, and the search for this resrouce is an integral part of this process. This encourages countries surrounded by seas and oceans to direct their efforts to search for and develop these reserves both in shallow water and at very great depths. The development of hydrocarbon deposits is a set of measures aimed at ensuring the flow of oil and gas from the reservoir to the bottom of the wells, providing a certain order of placement of wells on the area for this purpose as well as the order of drilling of these wells, commissioning, the establishment and maintenance of a certain mode of their operation. Further in the article, the author analyzes various geological characteristics of hydrocarbon deposits of the location under study.
This work may be of importance to those interested in obtaining information about hydrocarbon deposits around the world, in particular, this article focuses on hydrocarbon deposits of the Gulf of Guinea shelf.
Read MoreLITHOFACIES MODELS OF STRUCTURE SHELF SEDIMENTS WITHIN PURTAZOVSKAYA AND NADYM-PURSKAYA PETROLEUM REGIONS
Effective exploration and development of deposits begin with quality built geological models, in base of this models is detailed litho-facies data interpretation, which includes all complex of geological information. Extensive analyze of method data has been learned by the author and allows to create Object-oriented method of constructing litho-facies models. Method consists of 4 stage of research: regional structure, macro-, micro-heterogenenity and litho-facies interpretation.
Read MoreSTRUCTURAL AND MATERIAL COMPOSITION AND PROBABLE RESERVES OF THE DEPOSIT OF FINE GOLD “MUKHOR-GORKHON” (WESTERN TRANSBAIKALIA)
The paleopotamological studies in the valley of the Mukhor-Gorkhon Creek showed that the mountainous relief exists here for rather long, and the hydrological parameters of paleocreek were close to the present-day ones. The significant amounts of fine-grained gold (17-18%) and a bit less of dust-like and finely dispersed one (5-6%) have been revealed in the placer. Materials of researches can be used at stages of search and prospecting works on placer gold.
Read MoreCURRENT TECHNOLOGIES AND METHODS OF DISPOSAL OF DRILLING WASTE
This article presents an overview of existing technologies and methods of drilling waste treatment. Drilling wastes represent a significant environmental hazard due to highly toxic elements within them. Now there is no universal method of disposal of waste drilling that would meet all environmental requirements. Each gas-oil company selects a method based on the utilization of a variety of factors, combining existing and developing new technologies disposal of waste drilling. We have analyzed and selected the method of disposal of drilling waste for the region on the example of the Astrakhan gas condensate field.
Read MoreREGULARITIES OF CREATION OF PRODUCTIVE THICKNESSES OF BUILDING SAND IN DRY BASINS OF THE PRIBAIKALYE
Intermountain basins terrace complex is the main source of the reconnoitered, search and expected resources of building sand in the Pribaikalye. Materials of researches can be used at stages of search and prospecting geological works on building sand.
Read MoreTHE FIRST DATA OF THE APATITE FISSION TRACK DATING OF THE ZAGAN METAMORPHIC CORE IN TRANSBAIKAL
According to structural and geochronological data, the formation of the Zagan metamorphic core occurred in the Jurassic and Early Cretaceous. Later, according to fission track dating of apatite, in the tectonothermal history of the rocks composing the metamorphic core, three stages are clearly distinguished. 1) In the Late Cretaceous-Paleogene, high cooling rates of apatite to temperatures of 60-800 C can be observed. This corresponds to the exhumation of the rocks composing the core to depths of 1.5-2 km, which is associated with the ubiquitous processes of mountain formation in the region. The exhumation rates are estimated at 100 m / myr. 2) In the Neogene (25-5 myr), a period of weak tectonic activity (peneplenization) occurred everywhere. 3) Over the last 5-3 myr, tectonic activity has increased dramatically while the rate of exhumation (erosion) has increased to 400 m / myr, which is the maximum value that has been observed for the entire time period. Just over the last few million years, the foundation rocks of the Zagan complex were rapidly brought to the surface, which is associated with the reactivation of mountain formation processes.
Read MoreNEW DATA ON THE U-PB DATING OF ZIRCONS OF IGNEOUS AND METAMORPHIC ROCKS OF THE KURAY MOUNTAINS IN THE ALTAI REPUBLIC
In the axial region of the Kuray mountain range, metamorphic rocks of the Kuray assemblage are widely common. They rest in the form of tectonic plates separated by zones of metamorphic shale rocks and mylonites. The granitoids found in the field of distribution of rocks of the Kuray assemblage were traditionally interpreted as products of ultrametamorphism, an anatectic melting confined to the central parts of granite-gneiss domes. The authors of the study have dated zircons from the samples of granosyenite, quartz diorite, and from two samples of granite-gneisses of the Kuray assemblage using the U-Pb LA-ICP-MS method. The results demonstrate that granosyenites and diorites are of the same age (440.3 ± 7.3 and 449.1 ± 1.4 Ma) and are presumably different phases of the Late Ordovician igneous complex. The zircons from the granite-gneisses of the Kuray assemblage have similar ages of 445.0 ± 13.0 and 444.6 ± 9.9 Ma based on the cores, as well as the metamorphic rims of 367.8 ± 2.3 Ma. Presumably, the Late Ordovician intrusions have turned into granite-gneisses as a result of the Late Devonian metamorphism.
Read More“FOREIGN” MINERAL ASSOCIATIONS AND MULTI-STAGE NATURE OF THE JAMGYR GOLD DEPOSIT (WESTERN TIEN-SHAN)
The article discusses the results of studying gold mineralization of various objects called “foreign” that are part of mineral associations and are combined within the same deposit. The presence of atypical mineral parageneses of the deposit indicates its complex geological history. The study conducts an analysis of unusual associations of such minerals as gold, beryllium, bismuth, tungsten, carbon, copper, and molybdenum, some gold deposits of Russia, such as Karalveemskoye, Sovinoe (Chukotka), Ikanskoe, Vostochnoye Dvoynoe (Primorsky Krai), Kyzyk-Chadrskoe (Tuva). The study provides data on the thermobarogeochemical, mineralogical-petrographic, and geochemical studies of the Jamgyr deposit (Western Tien-Shan). The Jamgyr deposit contains such “foreign” mineral associations as gold, molybdenum and carbon. The study examines data on the stages of mineral formation of the Jamgyr deposit on the basis of data from the study of thermobarogeochemical parameters and mineral composition of vein and gold mineralization-containing rocks as well as the data on the study of primary geochemical halos of gold and molybdenum that reflect the features of the genesis of the Jamgyr deposit. The research substantiates the relationship between the halos of steam curing of gold and molybdenum mineralization discovered through thermobarogeochemical methods. Based on the analysis of data on these deposits and the studies of the genesis of the established mineral associations of the studied area, the article concludes that there are three stages of mineralization at the Jamgyr deposit: stockwork, carbonate-carbon-gold; molybdenum-porphyry, gold bearing; quartz-vein, gold-ore.
Read MoreCHAUSTINSKY METAMORPHIC COMPLEX OF THE NORTHERN PART OF THE ALTAI REPUBLIC: STRUCTURAL POSITION, AGE AND GEODYNAMIC CHARACTERISTICS
The Chaustinsky metamorphic complex was formed when basalts of the ocean floor and sedimentary rocks (perhaps, the deep-sea trough and the ocean floor) were submerged in the subduction zone. The Ar-Ar age of the amphibole is 522 Ma (Early Cambrian Period) corresponds to the subduction stage, while the mica ages 489±5.7, 498±3.8 and 499±5.4 Ma (Upper Cambrian) reflect the exhumation of rocks as a result of return currents in the subduction zone. According to the results of geochemical studies, the protoliths for the metabasite rocks of the Chaustinky complex (amphibolites, garnet amphibolites) were mainly basalts of the N-Morb type, less often E-Morb. The obtained data are in good agreement with the ideas about the formation of the Anuisko-Chuiskaya zone of the Altai Mountains as a structure of the accretion wedge of the Kuznetsk-Altai island arc in the Vendian-Cambrian time.
Read MoreAN ANALYTICAL REVIEW OF STRATIGRAPHY SCHEMES OF PRE-PALEOZOIC METAMORPHIC COMPLEXES OF THE GREATER CAUCASUS
The article analyzes the development of research on the stratigraphy of metamorphic complexes of the Greater Caucasus for the period from 1908 to 2013. The development of the Interagency Stratigraphic Committee in the areas of classification and nomenclature of stratigraphic units contributed to the detailing of geological maps and stratigraphic schemes. The study estimates the influence of geosynclinal and mobilist theoretical concepts on the selection and interpretation of stratified geological bodies. By 1968, the identification of two pre-alpine geosyncline cycles in the Caucasus, the Baikal and the Hercynian, was substantiated. After 1975, a number of series and suites were classified as thrust sheets. Published in 1995, the petrographic code turned the term “complex” (kompleks) into a homonym, the use of which led to a terminological confusion and the distortion of stratigraphic schemes of metamorphic formations.
Read MoreON THE POTENTIAL OIL-AND-GAS-BEARING TERRITORIES OF THE NORTH-EAST OF YAKUTIA
The shelves of the Laptev Sea, the East Siberian Sea and the Chukchi Sea are promising raw hydrocarbon exploration areas of the North-Eastern part of Russia. This article describes the potential oil-and-gas-bearing areas of the North-East of Yakutia, which include the Primorskaya basin adjacent to the coast of the East Siberian Sea between the rivers Kolyma and Chukochya, Tastakhsky trough, located to the Northwest of this basin, Olginskiy submontane trough at the foothills of The Moma Range, and a series of small-size intermontane basins: Omoloyskaya, Selennyakhskaya, Uyandinskaya, Momskaya. The study illustrates the prospectivity assessment of these territories, which will provide an opportunity for prospecting and discovering the projected hydrocarbon deposits in the Arctic regions of the Republic of Sakha (Yakutia).
Read MoreEXTRACTION OF HYDROCARBONS IN THE RUSSIAN AND ARCTIC CONTINENTAL SHELF AND RELATED RISKS
This article discusses the basic problems of hydrocarbon production in the Russian and arctic shelves, as well as their solutions.
Read MoreDISTRIBUTION OF THE PLATINUM GROUP ELEMENTS IN THE AUTONOMOUS ANORTHOSITES OF THE SOUTH-EASTERN RIM OF THE NORTH-ASIAN CRATON
PGE distribution in anorthosites of the Archean massifs is caused by the “laws” of crystallization of the high temperature mss which lead to the concentration of Ni, Fe, S, Ru and Rh in the solid phase and Cu and Pd concentration in melts. The character of the PGE distribution spectra in the Paleoproterozoic anorthosites is associated with the lower temperatures of mss crystallization and is close to the rocks from the ophiolite complexes. At the same time the absolute PGE contents are typical to those in basalts of island arcs.
Read MoreCOMPARATIVE ANALYSIS OF METHODS FOR CALCULATING SLOPE STABILITY UNDER 3D PROBLEM STATEMENT
3D modelling has ingrained into engineering analysis practice [1, p. 125-129], [2], [3, p. 320]. Thus far there is a large number of methods for 3D estimation of slope stability developed, based on both the numerical simulation and the principle of limit equilibrium [4, p. 94-101], [5, p. 75-81]. The article suggests a comparative analysis of calculation data on slope stability acquired through the limit equilibrium and finite-elements methods under 3D problem statement. As the target of research, we selected a section of the Sakhalin Railway on the section Pugachyovo-Makarov, exposed to the danger of landslide processes activating. Quantitative evaluation of slope stability is conducted through the limit equilibrium and finite-element methods under 3D problem statement. The key findings are as follows: the highest uncertainty of the calculations is linked with determining the configuration of the landslide body on the plan.
Read MoreTHE MONITORING OF GEODYNAMIC PROCESSES IN THE EASTERN PART OF THE ORENBURG REGION
In this article, a brief overview of the structural and tectonic zoning and geological structure of the Orenburg region is given. The problems related to geodynamic processes occurring on the territory of the Eastern Orenburg Region are identified.
Based on the analysis of the geodynamic state of the subsurface of the Eastern part of the Orenburg region, the authors suggest and justify an effective method for observing geodynamic processes using a seismological network.
They have developed a method of organizing a geodynamic testing area at the developed deposits of solid minerals using a network of seismic stations.
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