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Scientific articles
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Mesozoic fossil resin of Northern Eurasia
M. Bogdasarov
DOI: 10.19110/2221-1381-2017-7-3-11
Within the territory of Northern Eurasia (the part of the continent located to the north of 40° of northern latitude) fossil resins in Mesozoic deposits are related mainly to Cretaceous and less to Jurassic and Triassic rocks. The peculiarities of the geological structure of fields and physical and chemical properties of fossil resins of Mesozoic age from various regions — Siberia, Transcaucasia, the Far East are considered in the article. In the study of resins, methods for determining hardness and fragileness, differential thermal analysis, infrared spectrometry, chromatography-mass spectrometry, pyrolytic gas chromatography, and amino acid analysis were used.
Keywords: Fossil resins, romanite, valñhovitå, hedanite, Mesozoic, Northern Eurasia.
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3—11
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The domanik deposits of the Denisovsky downfold
according to the core data of the Komandirshor-12 well
D. A. Bushnev, N. S. Burdelnaya, A. N. Shadrin, A. A. Derevesnikova
DOI: 10.19110/2221-1381-2017-7-12-20
The Domanik deposits of the studied section are represented by thin-layered bituminous limestones accumulated in a calm hydrodynamic situation. Thermal maturity of organic matter is high, in terms of Tmax and elemental composition of kerogen it can be defined as late mature. The bitumen at this stage of thermal maturity mainly contains n-alkanes, the concentrations of isoprenoids are relatively small, and the polycyclic biomarkers are determined at the background level. The value of d13C of kerogen on average is 28.5. Kerogen, as it follows from NMR 13C spectroscopy, elemental analysis and pyrolysis with chromatography-mass spectral analysis of products, is mainly aromatic, but contains insignificant concentrations of n-alkyl chains. The generation potential of the Denisovsky downfold in the area of the Komandirshor-12 well is significantly realized.
Keywords: domanik, Timan-Pechora basin, kerogen, bitumen, maturation.
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12—20
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Sulphide-selenide mineralization in volcanogenic-sedimentary rocks
of the Shatak complex (Bashkirian meganticlinorium)
S. G. Kovalev, S. I.Vysotsky, S. S. Kovalev, V. A. Kotlyarov
DOI: 10.19110/2221-1381-2017-7-21-27
The aim of the work was a detailed study of sulfide-selenide mineralization found in volcanic-sedimentary deposits of the Shatak complex (Bashkir meganticlinorium). A study of minerals was carried out on the REMM-202M with EDA at the Institute of Mineralogy of the Ural Branch of the Russian Academy of Sciences (Miass) and the scanning electron microscope CamScan-4 with the analyzing attachment LINK OXFORD (VNIIHT, Moscow). Determination of Se, Cu, Fe, Pb, As is carried out by mass spectrometry with inductively coupled plasma in the VSEGEI Institute. Based on the content of Se, Cu, Fe, Pb, As in the rocks of the complex, a conclusion is made about metamorphogenic-hydrothermal formation of this type of mineralization. At the same time, it is stated that the question of the mechanisms of crystallization in local volumes of the extreme members of isomorphous series of selenides and sulfides (CuFeS2–CuFe3Se4(?), PbS–PbSe) remains open.
Keywords: Shatak complex, volcanic-sedimentary deposits, conglomerates, basalts, sulphides, selenides.
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21—27
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Lithology and stratigraphy of upper serpukhovian-lower baschkirian
deposits at the Pacha-Shor section (Ilych river, Northern Urals)
Е. S. Ponomarenko, R. M. Ivanova
DOI: 10.19110/2221-1381-2017-7-28-37
The organic buildup Pacha-Shor, which age and architecture have been still discussed, has been studied. According to foraminiferas the buildup is composed of protvinskian-suranskian limestones. It is composed of two zones: organic buildup and flanking layers. The type of the buildup is assigned to a brachiopod-microbial bank. The analysis of even-aged deposits in the Ilych River area showed that the brachiopod-microbial bank developed into lagoon between the development area of limestone breccias on the west and ooid-bioclastic shoals on the east.
Keywords: Northern Urals, Serphukovian, Baschkirian, Foraminifera, Organic buildups.
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28—37
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Microscopic studies of diatomite from Belaya Gorka outcrop
(Sverdlovsk region)
K. A. Faizieva
DOI: 10.19110/2221-1381-2017-7-38-41
The paper presents the results of microscopic studies of diatomite from a large natural outcrop — «Belaya Gorka», which due to its colossal dimensions is considered as a promising object of the mineral base of opal-cristobalite rocks in the Trans-Ural region. The diatomite from the Belaya Gorka has a clearly expressed biomorphic structure and well-preserved siliceous fossils. There are a huge number of undamaged and unchanged shells and porous shell space which do not contain clay minerals and neocrystallization of silica, and it allows classifying the studied diatomite as a high-quality raw material.
Keywords: opal-cristobalite rocks, siliceous rocks, Trans-Ural, diatomite, microstructure.
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38—41
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Chronicle, events, facts
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Paleozoic world by Tatyana Beznosova Сelebrating the 70th anniversary
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42
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Walking on water
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43—45
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Name immortalized in geology (Professor a. A. Chernov’s 140th anniversary)
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46—48
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