pdf № 282, June

DOI: 10.19110/2221-1381-2018-6-3-8

The influence of gas-fluid processes on the formation of both the rocks of the Visean terrigenous oil and gas bearing complex of the Timan-Pechora province and hydrocarbon deposits in them is considered. It was established that siderite concretions of the Lower Carboniferous terrigenous strata are siderite bacteriolites formed in the back-arc basin with normal marine fauna and occurrence of gas-fluid seepage in the bottom sediment. The formation of pyrophyllite in terrigenous rocks of the eastern margin of the sedimentation basin can also be associated with post-volcanic hydrothermal or metasomatic processes.

Keywords: organic matter, gas-fluid processes, oil and gas potential, hydrocarbons, oil and gas basin.

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DOI: 10.19110/2221-1381-2018-6-9-15

The objects of the study are mafic-ultramafic complexes of Kulibinsk potential ore unit, including intrusive bodies of kingashsk complex and metavolcanic rocks of kuliginskaya and kuzinskaya series; the studied objects are located at the north-western edge of Kansk greenstone belt in East Sayan. The relevance of the study is due to the appearance of new data on geological formations of the Kansk Greenstone Belt, which are the object of extensive discussions. Our studies showed a high potential of the territory associated with low-sulfidic type of PGE (platinum-group elements) mineralization, which founded in mafic-ultramafic bodies of kingashsk dunite-verlite-picritic magmatic complex. The highest concentrations of PGE are associated with footwalls of metapicritic bodies, where Pd concentrations reach 1 ppm with Pd/Pt ratio = 5—20. We characterized ore-bearing series, described features of their geochemical zoning, chemical and mineral composition, patterns of distribution of ore components. By the set of signs, PGE-metal deposits of Portimo complex (Finland) were proposed as the object-analogue.

Keywords: ultramafites, picrite, platinum, palladium, PGE, low-sulfidic PGE deposits, greenstone belt.

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DOI: 10.19110/2221-1381-2018-6-16-24

Ilmenogorsky miaskite massif, located in the southern segment of the regional shear zone, has a complicated structure and a long history of formation. This article presented original data about the structural-textural, mineralogical and geochemical features of mafic mylonite from the South-Eastern endocontact of the massif. A set of data shows a wide development of tectonometamorphic processes accompanied by metasomatic changes in the temperature range 500—650 °C and below. The rocks are void of the primary mineral paragenesis. The high concentrations of LREE and LILE are comparable to their concentrations in the rocks syenite-carbonatite association.

Кeywords: mafic mylonite, Ilmenogorsky miaskite massif, mafic-ultramafic rocks, syenite-carbonatite rocks.

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DOI: 10.19110/2221-1381-2018-6-25-29

Liquid-crystal phase transformation, metastable area around saturation point and precrystallization clusters in water-salt KNO₃ solution are investigated by Raman spectroscopy. We presented the existence of a quite wide solution metastable area in case of the temperature change, and also line shifts and broadenings in the Raman spectra are related to the presence of cluster associations during liquid-crystal phase transformation.

Keywords: Raman spectroscopy of solutions, phase transformation, precrystallization clusters.

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DOI: 10.19110/2221-1381-2018-6-30-34

The article presents the results of study of four polycrystals of diamond with a zonal structure from the Botuobinskaya tube. Plates about 0.4 mm in thickness were cut out from the crystals. The registration of the absorption spectra in the IR range was carried out by a Bruker VERTEX-70 Fourier spectrometer with a Hyperion1000 microscope. In addition to the concentration of defects A and B1, the absorption coefficient in the B2 band, the position of its maximum, and the absorption coefficient in the 3107 cm^-1 band were determined. Three types of low-temperature and polycrystalline shells were distinguished in accordance with its structural features. The shell of the first type consisted of oriented microblocks, contained a large number of carbonate and sulfide inclusions. The shell of the second type had a uniform structure with less inclusions. The transparent shell of the third type consisted of lamellas with a tangential growth mechanism, the space between them was filled with a diamond without clear structural features.

Keywords: microcrystals of diamond, tube Botuobinskaya, spectroscopy.

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DOI: 10.19110/2221-1381-2018-6-35-42

Studied rocks from Lop’yu Kyrta rock at the Ilych River (Northern Urals) are represented mainly by biohermal limestones, lime sandstones, gravelite-sandstones and breccias. Among Biohermal limestones stromatolitic ones are predominate, coral, Fistulella-microbial, and stromatoporoid-microbial ones are rarer. The comparison and correlation of transect series allow us to establish the landscape-morphological zonation of Lop’yu Kyrta buildup, an outer slope and a reef-flat are distinguished. The reef-flat was differentiated into the reef-crest, gravel-sand shoals, a reef core and a back-reef. In general, the stromatolite structure of framework and the characteristic reef zonation can attribute Lop’yu Kyrta to a specific type of buildups — a stromatolite reef. It was established that the Lop’yu Kyrta stromatolite reef had much in common with the modern microbial Highburne Cay reef at the Great Baham Bank. Stratigraphically and geographically similar Upper Silurian stromatolite reefs from the Northern Urals and Alaska are considerably different by their frameworks architecture from Lop’yu Kyrta buildup.

Keywords: Lower Devonian, Lochkovian, stromatolite reefs, palaeolandscape-morphological transect, a framework architecture.

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DOI: 10.19110/2221-1381-2018-6-43-49

Forced storage of a huge amount of wastes, their removal to dumps, environmental risks testify to a very unfavorable situation in the complex use of mineral raw. Our paper considers this problem from the point of view of technological mineralogy within the framework of «Strategy for the Development of Russian Industry for Processing, Utilizing and Neutralizing Production and Consumption Wastes up to 2030». An individual complex of mineralogical analysis methods is used for each type of the wastes. We show that mineralogical characteristics (mineral and (or) phase composition, mode of occurrence of a useful component, morphostructural features and character of distribution, real composition and structure) are inherent for the mining wastes, which subsequently determine the strategy and tactics of its secondary use.

Keywords: mining wastes, technological mineralogy, mineralogical characteristics, recycling technologies.

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