pdf № 360, December

DOI: 10.19110/geov.2024.12.1

Grothite, a rare fluorine-alumina variety of titanite, was found and studied in the shales of the Irtysh shear zone (Eastern Kazakhstan). The mineral composition was defined Tescan Vega3 scanning electron microscope (SEM). The Al₂O₃ and F contents, which are not typical for titanite, allowed classifing it as Al-F titanite (grothite). In addition to alumina and fluorine, the studied grothite contains FeO and Y₂O₃. The general formula of the mineral is as follows: (Ca_0.94—1.02Y_0.02—0.04Fe_0.01—0.02)_{Ʃ0.99—1.04}(Ti_0.83—0.89Al_0.11—0.16)_{Ʃ0.94—1.02}(Si_0.95—0.99Al_0.01—0.05)_Ʃ1.00O₄(O_0.86—0.91F_0.09—0.14)_Ʃ1.00.

The maximum contents of Al₂O₃ and F are characteristic of the central parts of large grains of grothite from muscovite-biotite schists, and the minimum for small grains of grothite from biotite schists, which, apparently, reflects lower pressure parameters during the formation of the latter. The mineral composition of the shales and the low alumina contents in the grotite may indicate the possibility of its crystallization in the rocks of the greenschist facies.

Keywords: grothite, schists, metamorphism, Eastern Kazakhstan, Irtysh Shear Zone

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DOI: 10.19110/geov.2024.12.2

The paper presents the first results of local studies of the content and distribution of trace elements in minerals of low-sulfide ores of various associations of the Ozernoe (copper-)gold-palladium occurrence, discovered in 2002 in the Polar Urals and localized in clinopyroxenites and wehrlites of the Middle Paleozoic. According to LA-ICP-MS data, the diversity and concentration levels of trace elements in three associations (pyrrhotite-pyrite, pyrrhotite-chalcopyrite-cubanite and bornite-chalcopyrite) are different. Thus, pyrite of the first association, common on the flanks of the ore zone, is characterized by high concentrations of Co, Se, moderate ones of Ni and traces of Bi, Sb, Ag. The minerals of the pyrrhotite-chalcopyrite-cubanite association, common within the ore zones, commonly contain Ag, Pb and Se, as well as groups of elements (Sb, Bi, Au, Te and Pd), occurring in noticeable amounts, but sporadically, which may be conditioned by microinclusions of their minerals. The highest concentrations of Ag, Se, Te, and Pd are recorded in copper sulfides of the bornite-chalcopyrite association, especially in bornite. The main components of ore and non-metallic minerals (sulfides, Fe-oxides, olivine and pyroxene) has been studied by electron probe microanalysis.

Keywords: clinopyroxenites, palladium, gold, trace impurities, LA-ICP-MS method, electron probe microanalysis, Polar Urals

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DOI: 10.19110/geov.2024.12.3

 The paper presents the results of the study of the remains of cyanobacteria and calcareous algae of the Lower Permian organogenic buildups from the “Pisanyi Kamen’” section at the Un’ya River (Northern Urals). The microscopic study allowed extending taxonomic composition of Early Permian cyanobacteria and algae in the buildups: 3 genera of cyanobacteria, 12 genera of green algae, 2 genera of red algae and 4 genera of unclear systematic position were identified. It was revealed that representatives of green algae of the families Dasycladaceae and Cyclocrinaecae mainly participated in the formation of the first organogenic buildup, and algae of the Anchicodiaceae family participated in the second buildup. The established Asselian taxa of calcareous algae are cosmopolitan, therefore they may be important for the correlation of the Lower Permian West Ural sections.

Keywords: Northern Urals, organogenic buildups, Lower Permian, cyanobacteria, ancient algae

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DOI: 10.19110/geov.2024.12.4

As a result of activity of enterprises of the timber industry complex for the production of paper products, significant volumes of secondary mineral raw materials are formed, which need to be utilized. Soil liming is a promising direction of utilization of such raw materials. By methods of X-ray diffraction, X-ray fluorescence and thermal analyses, mass spectrometry with inductively-coupled plasma, radiological studies the material composition of secondary mineral resources of Syktyvkar TP (dust of electric filters of furnaces, slaked lime obtained from substandard calcium oxide, bark and wood ash) has been determined. The determined features of changes in phase and chemical composition of secondary raw materials allowed to develop original compositions of agrochemicals named “Edemit” and “Pushonka plus”, which were tested for soil liming on the experimental field. It was found that liming contributed to the increase of soil pH value from 4.6 to 6.6 on average, the degree of saturation with bases up to 44—92 % and decrease of hydrolytic acidity twice as compared to the control variant.

Keywords: lime agrochemicals, calcite, portlandite, calcium oxide, «Edemit», «Pushonka Plus», acidic soils, ameliorants

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DOI: 10.19110/geov.2024.12.5

The article contains information about the material composition of coal sludge of the Prokopievskugol Processing Plant. The material is 75.54 % represented by polyphase aggregates of coal, clay minerals, quartz and carbonates with different quantitative ratios of components. The ash content of the feedstock is 32.5 %. The productive size range for this raw material has been determined — from 0.04 to 1 mm. We found that the raw materials were of practical interest in obtaining coal concentrate by screw separation. Our technological tests resulted in coal concentrate with an ash content of 10.95 % of dry fuel from coal sludge by screw separation.

Keywords: Kuznetsk coal basin, coal sludge, spiral separation mineralogical and technological assessment of raw materials, coal enrichment waste

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