pdf № 317, July

DOI: 10.19110/geov.2021.7.1

The lithological and geochemical features of the metasandstones of the Svetlinskaya and Vizingskaya formations of the Middle Late Riphean Chetlas series in the Middle Timan, which are a substrate of rare-metal-rare-earth mineralization in several ore occurrences of the Kosyus ore cluster, have been investigated. The interpretation of the results of traditional weight chemical and mass spectrometric inductively coupled plasma (ICP MS) analyses allowed us to identify differences in the material composition of metapesanics, mainly due to changes in the degree of sedimentation maturity of terrigenous material coming from the demolition areas. The composition of metasandstones in various ratios includes both weakly weathered products of destruction of volcanic rocks of intermediate/basic composition, and altered, including under conditions of the weathering crust, metaterrigenous formations. The accumulation of sediments took place in a shallow coastal-marine environment with changing hydrodynamics, which affected the rate of destruction of rocks in paleo-catchments.

Keywords: metasandstones, detrital material, sources of demolition, sedimentation conditions, geochemical characteristics, Middle Timan, Svetlinskaya and Vizingskaya formations.

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DOI: 10.19110/geov.2021.7.2

After 7 symmetry groups of borders, 17 symmetry groups of grid ornaments are the next step on the way to 230 space symmetry groups in the university course of crystallography. A simple derivation of grid ornaments is proposed, combining the search for 10 flat clusters and their translations in 5 parallelogram grids. Analysis of grid ornaments in the urban landscape (artistic mosaics, wall claddings, floorings, etc.) draws students to the actual problem of the prevalence of 230 space symmetry groups in minerals.

Keywords: grid ornament, cluster, parallelogram grid, symmetry group.

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DOI: 10.19110/geov.2021.7.3

The article is devoted to the history of the study of fossil algae and plants in the Paleozoic sedimentary deposits developed in the north-east of the European part of Russia. The main locations of the fossilized flora in this area are indicated. The history of the study shows that the remains of ancient plants and algae have been studied unevenly, which is due to the nature of the distribution of the remains and their preservation, as well as the lack of specialists. The generalization of the available information made it possible to present a collection of fossil algae and plant remains of the Paleozoic in the A. A. Chernov Geological Museum, which are of scientific and educational interest.

Keywords: fossil algae, collections of plant remains, Paleozoic, north-east of the European part of Russia, A. A. Chernov Geological Museum.

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DOI: 10.19110/geov.2021.7.4

The article analyzed organizational and scientific activities of the first head of the Department of Geology of Fuels of the Institute of Geology of the Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences V. A. Dedeev, a well-known scientist in geotectonics and geology of mineral resources. He greatly contributed to the study of the formation conditions and distribution of oil and gas fields, solved problems of their geological, economic and forecasting assessment. His important practical result was the analysis of potential energy resources of the European North of Russia and the north of the Urals and their effective development.

We showed V. A. Dedeev’s role in the postgraduate education of young scientists working on studying and expanding the resource base of the oil and gas industry of the Komi Republic and the Nenets Autonomous Okrug. The article summarized V. A. Dedeev’s published and collection materials in various areas.

Keywords: geotectonic, platform cover structures, sedimentary basin, reserves and resources, hydrocarbons, oil and gas complex.

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