Problems of mineralogy, petrography and metallogeny. Scientific readings in memory of P.N. Chirvinsky

To the mineralogy of some ore occurrences of Bolshevik Island

V. E. Bayandin — 2025-03-31

The article presents the characteristics of some occurrences of Bolshevik Island. Quartz-pyrite veinlets with galena inclusions are noted in the black shales of the Golyshevskaya area. An admixture of Co and As is noted in the pyrite, and the manifestation of calcite graphitization and potassium metasomatism is noted in the shales. The content of Pb, As, Au in the veinlets corresponds to the ore level. Mineralization on Cape Mordovina is represented by cassiterite-sulfide-quartz veins in hornfelses. Sulfides of As, Cu, Zn, Pb, bismuth sulfotellurides, muscovite and pyrophyllite are diagnosed here. The presence of cassiterite, arsenopyrite, and bismuth minerals indicate a connection between hydrothermal formations and crustal granites. The contents of Cu, Zn, As, Cd, In, Sn, Ta, Ag, Pb, Bi, Au are related to the ore level. Galena, sphalerite, pyrite, and acanthite have been diagnosed in the sulfide-carbonate-quartz vein of the Norinsky site. The content of Zn, Ag, Cd, and Pb in it corresponds to the ore level, which allows it to be attributed to the silver-polymetallic association.

Geodynamic conditions of the formation of the Badiayu and Yarot massifs (the Subpolar Urals)

Yu. V. Denisova — 2025-03-31

The study of high-potassium medium-grained leukogranites of the Badiayu and Yarots massifs (the Subpolar Urals), which break through the deposits of the Moroinsky formation, allowed not only to confirm L. V. Makhlaev's assumption of early belonging to a single pluto, but also on the basis of a comprehensive study of petrogenic and rare elements using qualification diagrams to establish that the formation of the studied rocks is associated with the post-collisional stage of development Protouralid is a Timanid.

Lithologic-mineralogical investigations during diamond-prospecting work

N. N. Zinchuk — 2025-03-31

On the example of Paleozoik and Mesozoic deposits of one of the main diamondiferous regions of the Siberian platform basic suppliers of terrigenous material to ancient diamondiferous placers under formation and their occurrences are characterized. Special attention is paid to characteristics of local sources of allothigenous material removal to sedimentation basins of the said period, the main of which were of Upper Devonian-Carboniferous crusts of Middle-Late Triassic crusts of weathering on terrigenous-carbonate rocks, formations of trappean origin (dolerites, tuffs, tufogene thick layers) and kimberlites.That is why redeposited in ancient sedimentary thick layers products of various types of crusts of weathering preserve structural and chrystallochemical features in relation to the minerals of eluvial thicknesses, which allow tracing the ways of terrigenous material arrival into sedimentation basins (including diamondiferous material).

Material aspects of kimberlite rocks productivity

N. N. Zinchuk — 2025-03-31

Most of investigated kimberlite diatremes of the represent multiphase pipes. Each magmatic phase of intrusion, formed inside diatremes, is composed by kimberlites with specific petrographic and petrochemical type possessing a number of stable, weakly changing with depth typomorphic features. Carried out investigations indicated sufficient distinctions in diamondiferousness of different intrusion phases of kimberlites, which is stipulated by different level of emplacement and duration of functioning of forming them magmatic hotbeds, physical-chemical properties of initial components, as well as by velocity of ascent and character of kimberlite magma advance in the process of different kimberlite-formation stages. Kimberlite breccias of completion stages of pipes formation are most productive in comparison with porphyritic kimberlites of early intrusive penetration phases. When assessing productivity of kimberlite pipes it is necessary to consider real correlations of intrusive and explosive processes of kimberlite-formation in diatremes, which usually change in time.

Copper-colored sandstones of the Kama region

R. G. Iblaminov — 2025-03-31

The geochemical aspect, stratigraphic, formation position and composition of the copper sandstones in the Perm region are considered. Their exogenous formation and genetic similarity with the deposits of the world are substantiated. Their local history and ecological significance.

Causes of turbidity of spring waters in the Irensky karst region

Yu. A. Kilin — 2025-03-31

Turbidity of spring waters confined to sulfate-carbonate deposits of the Kungurian stage - P₁kg represented by gypsum, anhydrite, limestone, dolomites is associated with the processes of physical and chemical weathering. As a result of the impact of the underground water flow on the weathering products, a supersaturated aqueous solution of gypsum with a high content of finely dispersed mineral fraction is formed, which manifests itself in the places of the outlet of turbidity of springs. Springs with turbidity are confined to areas of oil field development, where oil pollution is observed. A direct reaction occurs between sulfates and hydrocarbons dissolved in water with the participation of sulfate-reducing bacteria.

Features of the composition and mineralogy of the cupriferous sandstones of the southeastern Perm krai

A. Y. Kisin — 2025-03-31

Studies of cupriferous grey-colored sandstones in the southeast of the Perm Krai (villages of Aspa, Ashap, Yug) have been conducted. Sandstone is composed of apovolcanogenic flints and chalcedonies (up to 95%); quartz up to 5%. The composition corresponds to greywacke. The heavy-mineral fraction is dominated by chloritized biotite, magnetite, and zircon; titanite and spessartine crystals are common. Zircon, titanite, and spessartine are of the same type, with no signs of mechanical wear. We assume that the sources of the material were local, possibly related to the Early Permian tectonic magmatic activation.

Analysis of geochemical fields in the west of the Siberian Platform and forecasting oil and gas accumulation zones

I. S. Kopylov — 2025-03-31

Regional and forecast-re-reference geochemical studies were carried out in the west of the Siberian platform. Based on the results of the research, a comprehensive interpretation of geochemical indicators with the zoning and assessment of geochemical fields was performed. 30 large complex geochemical anomalies and 6 main groups of anomalies were installed, in which it is possible to predict the accumulation zones of oil and gas.

Preliminary data on autigenic mineral formation in natural chlo-ride water discharge sites in the Solonikha river basin (Perm region)

O. V. Korotchenkova — 2025-03-31

The Verkhnekamskoe Salt Deposit is reflected in the appearance of natural chloride waters on the earth's surface, migrating from the depths as a result of natural factors. To identify the features of mineral formation in such areas, we studied the soil of two springs in the Solonikha river basin (Aleksandrovsky Municipal District of Perm Krai; above the eastern boundary of the salt deposit) with a sodium chloride composition and a total mineralization of 15,13–23,67 g/l. During the mineralogical analysis of the soil, pseudomorphs (on plant detritus) of pyrite, less often barite and calcite were revealed. Visually, a direct correlation is noted between the intensity of pyritization and baritization processes and the total mineralization of water.

Sandstones of the Salikhovo formation, Vendian in the section of well 4 Aslykul, Volga-Uralian area (electron microscopy data of rock-forming and accessory minerals)

M. M. Mikhnenko — 2025-03-31

The Salikhovo Formation of the Upper Vendian of the Volga-Uralian area is an important lithostratigraphic horizon for interregional correlations; the presence of oil and gas manifestations allows us to consider the suite as an object for hydrocarbon exploration. Sandstones of the Salikhovo Formation (well 4 Aslykul) were studied using a scanning electron microscope. The composition of rock-forming and accessory minerals was clarified, previously undiagnosed minerals of rare earth elements were identified, which will allow us to further identify additional correlation criteria and clarify possible sources of clastics for the sandstones of the Salikhovo Formation.

The nature, composition and properties of permafrost rocks of the arctic cryolithozone development area (on the example of the Gydan peninsula)

S. K. Mustafin — 2025-03-31

The results of studying the nature, composition and properties of Quaternary sediments of the Gydan cryolithozone, which will serve as a reliable basis for the construction and subsequent reliable safe operation of critical engineering structures in the complex and heterogeneous geological environment of the Arctic cryolithozone, are discussed. The materials of a comprehensive engineering and geological study of soils will form the basis of a database for regional monitoring of the natural state and dynamics of man-made transformation of the geological environment of the cryolithozone for forecasting, assessing and reducing risks for the sustainable development of the territory.

The role of mineralogical investigations as the part of prognosis-research complex on diamond placers in the Urals

B. M. Osovetsky — 2025-03-31

The role of mineralogical investigations as a part of prognosis-research complex on placer diamonds in the Urals is concluded in the use of their results for decision of the next problems: 1) the use of mineralogical control of placer diamondiferous; 2) appreciation of the negative influence of local rocks; 3) making the decision on the question concerning the choice of objects for prospecting works.

New data on lithological sampling of sediments of the basis of the Takata Formation in the Yaivinsky diamond-bearing region (Middle Ural)

Y. G. Paktovsky — 2025-03-31

The article discusses the importance of the lithological sampling method for searching for diamond placers in the Urals. Using the example of new study areas adjacent to the western flank of the Syuzevsky placer diamond deposit, mineral associations of the heavy fraction of lithological samples taken from the base of the Takata formation in the Yaivinsky diamond-bearing region (Middle Urals) are shown. The results obtained are compared with the results of a previously conducted lithological sampling in the Vishera diamondiferous region (Northern Urals). The similarity of the new data obtained with the already known ones is emphasized. It is noted that the mineral association of the heavy fraction of the base rocks of the Takata Formation in both areas is leucoxene, while the mineral aggregate leucoxene is an indicator for weathering crusts. The data obtained make it possible to recommend a lithological sampling technique for prospecting work in new territories in diamond-bearing areas, in particular, to determine the spatial position of potentially diamond-bearing rocks, their mineral dispersion halos, as well as for the stratigraphic division of “silent” geological strata.

To the mineralogy of slag from metallurgical conversion of copper-nickel ores at the Monchegorsk site of JSC KOLА MMC

S. S. Potapov — 2025-03-31

TO THE MINERALOGY OF SLAG FROM METALLURGICAL CONVERSION

OF COPPER-NICKEL ORES AT THE MONCHEGORSK SITE OF JSC KOLА MMC

Potapov S.S., Goryachev A.A., Makarov D.V., Parshina N.V.

s.potapov-60@yandex.ru

The mineral composition of slags from metallurgical processing at the Monchegorsk site of JSC Kola MMC was studied using X-ray phase analysis, scanning electron microscopy and energydispersive spectroscopy. The silicate matrix of the slag is represented by diopside CaMgSi₂O₆, olivine, (Mg,Fe)(SiO₄), as well as end members of the isomorphic series ‒ forsterite Mg₂SiO₄ and fayalite Fe₂SiO₄, which is typical for slags. Quartz SiO₂ and cristobalite SiO₂ are present in the slag in small quantities. The X-ray diffraction method revealed only pyrite FeS₂ among sulfide minerals. The SEM EDS method revealed cubanite CuFe₂S₃, pentlandite (Fe.Ni)₉S₈, pyrrhotite Fe_nS_n+1, and native iron.

U-Pb dating using zircon from rhyolites of the Fedotovskaya formation of the Kvarkush-Kamennogorsky meganticlinorium of the Western Urals

A. Yu. Puzik — 2025-03-31

New data from a U-Pb isotope geochronological study of zircon from rhyolites of the Linevsky complex of the Fedotovskaya formation of the Kamennogorsk anticlinorium of the Middle Urals are presented. Such studies of Upper Riphean deposits have not yet been carried out by anyone and are presented for the first time; before this, the Fedotov formation was “mute”.

Some practical results of thermal (DSC/TG) analysis of carbonate rocks

M. A. Pshevlodsky — 2025-03-31

The results of synchronous thermal (DSC/TG) analysis of limestones are presented. Limestones are represented by organogenic-detrital and pelitomorphic varieties. Thermal analysis on a small sample and low heating rate demonstrates, along with the pronounced endothermic effect of calcium carbonate dissociation, the effect of lime crystallization.

The material composition of the vendian deposits in the area of the Rassolnaya river in the Vishersky diamond-bearing area

E. M. Tomilina — 2025-03-31

The article presents the results of a study of the mineral composition, structural and textural features of vendian rocks in the area of the Rassolnaya кiver in the Vishersky diamond-bearing area. Based on the results of a comprehensive study, the composition of the rocks of the Ilyavozhskaya and Kocheshor formations was clarified. The rocks of the Ilyavozhskaya formation are sandstones with interlacing of clay siltstones. The rocks of the Kocheshor formation are various sandstones, siltstones and mudstones.

Оn the mechanism of differentiation of petrogenic and ore elements in banded-disseminated ores of the Skalistiy mine of the Talnakh ore cluster

I. I. Chaikovskiy — 2025-03-31

The banded-disseminated ores are characterized, for which the manifestation of silicate-oxide (olivine, spinel, plagioclase) fractionation, silicate-sulfide and chalcopyrite- pyrrhotite immiscibility is shown. It has been established that the sulfide melt accumulates not only fluids (Cl, P, H₂O), but also petrogenic components (SiO₂, Al₂O₃, TiO₂, FeO, MgO, CaO, K₂O), which cause iron oxidation, the appearance of hydroxyl-containing minerals and various types of metasomatic reactions, mobilization and spatial redistribution of noble metals and chalcophile elements.

Using the Raman spectroscopy method for the qualitative determination of gas inclusions

D. V. Sheshukov — 2025-03-31

The article presents the results of a qualitative analysis of the gas inclusions of two salt samples of a Verkhnekamskoye deposit, taken from education collection of a mineralogy and petrography department of PSU. Research was performed for mastering the methodology determination of gas inclusions in minerals using Raman spectroscopy method. The results were compared with researches other specialists.