A small dike of unknown age was found on the territory of the Kanin-Timan region within the Middle Timan along the Lunvozh river. Our studies revealed that the rocks, composing this intrusive body, corresponded to basaltic andesites according to the content of the main rock-forming elements. They were almost completely recrystallized and composed of chlorite (30—40 %), carbonates (25—40 %), albite (10—15 %), quartz (10—15 %), muscovite (5—8 %) and plagioclase (less than 1 %). Accessory minerals were represented by apatite, monazite and rutile. Ore minerals included pyrite, chalcopyrite, and cobaltine. According to the mineral composition and petrochemical characteristics, the rocks composing the dike body along the Lunvozh river, differed from the basites of the Middle Riphean Middle Timan and Devonian Kanin-Timan complexes identified in the Kanin-Timan region.
{"title":"Metabasites along the Lunvozh river (Middle Timan): petrography, mineralogy, petrochemistry","authors":"A. Shmakova","doi":"10.19110/geov.2023.10.3","DOIUrl":"https://doi.org/10.19110/geov.2023.10.3","url":null,"abstract":"A small dike of unknown age was found on the territory of the Kanin-Timan region within the Middle Timan along the Lunvozh river. Our studies revealed that the rocks, composing this intrusive body, corresponded to basaltic andesites according to the content of the main rock-forming elements. They were almost completely recrystallized and composed of chlorite (30—40 %), carbonates (25—40 %), albite (10—15 %), quartz (10—15 %), muscovite (5—8 %) and plagioclase (less than 1 %). Accessory minerals were represented by apatite, monazite and rutile. Ore minerals included pyrite, chalcopyrite, and cobaltine. According to the mineral composition and petrochemical characteristics, the rocks composing the dike body along the Lunvozh river, differed from the basites of the Middle Riphean Middle Timan and Devonian Kanin-Timan complexes identified in the Kanin-Timan region.","PeriodicalId":23572,"journal":{"name":"Vestnik of geosciences","volume":"72 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138586986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Framboids of pyrite were found in bituminized argillic metasomatites of the Mikheev porphyry copper deposit (Southern Urals). A wide occurrence manifestation of low-temperature metasomatism — argillization — is a feature of the rock complex of this deposit. According to the results of thermoweight analysis, the values of organic matter in bituminized argillic metasomatites correspond to kerite. The organic matter support the habitation of microbial communities, including the presence of element-depositing bacteria. The use of high-resolution scanning electron microscopy allowed identifing preserved mineralized biofilms and accumulations of extracellular biopolymers, including seeds of forming pyrites. Such morphological features suggest on a bacteria formation of the framboidal pyrites of the argillizites of the Mikheev deposit.
{"title":"The peculiarities of the framboidal pyrites of the Mikheev porphyry copper deposit (Southern Ural)","authors":"Lyubov' Leonova, O. Azovskova, E. Soroka","doi":"10.19110/geov.2023.9.2","DOIUrl":"https://doi.org/10.19110/geov.2023.9.2","url":null,"abstract":"Framboids of pyrite were found in bituminized argillic metasomatites of the Mikheev porphyry copper deposit (Southern Urals). A wide occurrence manifestation of low-temperature metasomatism — argillization — is a feature of the rock complex of this deposit. According to the results of thermoweight analysis, the values of organic matter in bituminized argillic metasomatites correspond to kerite. The organic matter support the habitation of microbial communities, including the presence of element-depositing bacteria. The use of high-resolution scanning electron microscopy allowed identifing preserved mineralized biofilms and accumulations of extracellular biopolymers, including seeds of forming pyrites. Such morphological features suggest on a bacteria formation of the framboidal pyrites of the argillizites of the Mikheev deposit.","PeriodicalId":23572,"journal":{"name":"Vestnik of geosciences","volume":"59 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138596823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The results of detailed geochemical studies of natural bitumen in the section of the Kozhva River of the Timan-Pechora province, localized in the dolomites of the Kamensk formation of the Upper Famenian, are presented. It is established that bitumen is allochthonous. This is quite understandable from a geological point of view: the formation of bitumen manifestations is associated with the vertical migration of hydrocarbons (HC) in the zone of the Pripechorsky deep fault, resinous-asphaltene components predominate in the bitumen group composition. Gas chromatography and gas- chromatography-mass spectrometry proved that bitumen underwent intensive bacterial degradation, which led to the loss of n-alkanes and isoprenoids, steranes and partially hopanes. Tricyclanes of composition C19-C25, tetracyclane C24 and «geohopanes» with configuration 17α(H)21β(H) of composition C27 (Ts, Tm) and C29 were identified on mass chromatograms of m/z 191. It was found that tricyclanes predominate. On chromatograms according to m/z 177, 25-norhopane of the composition C28 was identified. Series 25-norhopane series was observed. The isotopic composition of carbon of individual fractions is characteristic of sapropel OM and is similar to the ICC of the previously studied bitumen of the Voya deposit.
{"title":"Geochemistry of organic matter of natural bitumen in the section of the Kozhva river (Timan-Pechora province)","authors":"O. Valyaeva, N. Ryabinkina","doi":"10.19110/geov.2023.9.5","DOIUrl":"https://doi.org/10.19110/geov.2023.9.5","url":null,"abstract":"The results of detailed geochemical studies of natural bitumen in the section of the Kozhva River of the Timan-Pechora province, localized in the dolomites of the Kamensk formation of the Upper Famenian, are presented. It is established that bitumen is allochthonous. This is quite understandable from a geological point of view: the formation of bitumen manifestations is associated with the vertical migration of hydrocarbons (HC) in the zone of the Pripechorsky deep fault, resinous-asphaltene components predominate in the bitumen group composition. Gas chromatography and gas- chromatography-mass spectrometry proved that bitumen underwent intensive bacterial degradation, which led to the loss of n-alkanes and isoprenoids, steranes and partially hopanes. Tricyclanes of composition C19-C25, tetracyclane C24 and «geohopanes» with configuration 17α(H)21β(H) of composition C27 (Ts, Tm) and C29 were identified on mass chromatograms of m/z 191. It was found that tricyclanes predominate. On chromatograms according to m/z 177, 25-norhopane of the composition C28 was identified. Series 25-norhopane series was observed. The isotopic composition of carbon of individual fractions is characteristic of sapropel OM and is similar to the ICC of the previously studied bitumen of the Voya deposit.","PeriodicalId":23572,"journal":{"name":"Vestnik of geosciences","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138595564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Silaev, V. Titov, A. Tesakov, V. Filippov, E. Vasil'ev, I. Smoleva, S. Shanina, Dar'ya Kiseleva, A. Khazov, B. Makeev, N. Soloshenko, T. Okuneva
Using a wide complex of mineralogical-geochemical and isotope-geochemical methods we studied, a unique series of samples of fossil camels’ bone remains taken from Eurasian localities from the northwestern Black Sea region to western Transbaikalia and Mongolia, dated in the chronological range from the Late Miocene (6 Ma) until the 14th century AD. The obtained results indicated the mineralogical and geochemical properties of fossil bones as very effective way of ecological and climatic reconstructions and interpretation of the evolutionary history of mammals.
{"title":"Fossil bones of the Miocene-Holocene camels of Eurasia (Russia): mineralogical and geochemical properties and ecological reconstructions","authors":"V. Silaev, V. Titov, A. Tesakov, V. Filippov, E. Vasil'ev, I. Smoleva, S. Shanina, Dar'ya Kiseleva, A. Khazov, B. Makeev, N. Soloshenko, T. Okuneva","doi":"10.19110/geov.2023.9.1","DOIUrl":"https://doi.org/10.19110/geov.2023.9.1","url":null,"abstract":"Using a wide complex of mineralogical-geochemical and isotope-geochemical methods we studied, a unique series of samples of fossil camels’ bone remains taken from Eurasian localities from the northwestern Black Sea region to western Transbaikalia and Mongolia, dated in the chronological range from the Late Miocene (6 Ma) until the 14th century AD. The obtained results indicated the mineralogical and geochemical properties of fossil bones as very effective way of ecological and climatic reconstructions and interpretation of the evolutionary history of mammals.","PeriodicalId":23572,"journal":{"name":"Vestnik of geosciences","volume":"64 29","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138594908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The objects of study are diaplectic and melt silicate glasses from vein melt impactites of the Kara astrobleme. Microscopic and spectroscopic characteristics of two glasses with fundamentally different formation mechanisms were obtained, which allowed comparing their structural features. We found that silicate diaplectic and melt impact glasses from high-pressure/high-temperature vein bodies of the Kara astrobleme were characterized by similar structural features — a high degree of polymerization, the presence of four-membered and polymembered SiO4 rings, which was characteristic of all glasses were the SiO2 composition. Diaplectic glasses are characterized by the constant presence of three-membered SiO4 rings; melt glasses were characterized by the absence of this feature, which was determined by more extreme conditions for the glass from melt.
{"title":"Comparative characteristics of diaplectic and melt silicate glasses of the Kara astrobleme","authors":"A. Zubov, T. Shumilova, S. Isaenko","doi":"10.19110/geov.2023.9.4","DOIUrl":"https://doi.org/10.19110/geov.2023.9.4","url":null,"abstract":"The objects of study are diaplectic and melt silicate glasses from vein melt impactites of the Kara astrobleme. Microscopic and spectroscopic characteristics of two glasses with fundamentally different formation mechanisms were obtained, which allowed comparing their structural features. We found that silicate diaplectic and melt impact glasses from high-pressure/high-temperature vein bodies of the Kara astrobleme were characterized by similar structural features — a high degree of polymerization, the presence of four-membered and polymembered SiO4 rings, which was characteristic of all glasses were the SiO2 composition. Diaplectic glasses are characterized by the constant presence of three-membered SiO4 rings; melt glasses were characterized by the absence of this feature, which was determined by more extreme conditions for the glass from melt.","PeriodicalId":23572,"journal":{"name":"Vestnik of geosciences","volume":"45 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138596296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Sokerin, Yu. Glukhov, Renat Shaybekov, B. Makeev, S. Zorina
A comprehensive mineralogical study of 13 samples of spheroidal gold from schlich concentrates of the Middle Kyvvozh gold placer, which is part of the Kyvvozh gold placer field located in the central part of the Volsk-Vym ridge of the Middle Timan, was carried out. The presence of both natural and technogenic gold in concentrates was established. Natural placer spheroidal gold is characterized by a worn surface with oxide films and the development of a high-grade corrosion rim. Technogenic gold spheroids have a polygonal-mosaic tuberculate-pitted or smooth surface, the presence of aluminosilicate glasses and slags in the form of crusts or inclusions in the matrix, the presence of mineral inclusions and impurities of platinum group metals, tin and lead, which are not characteristic of native gold. Natural spheroids were formed by natural smoothing in the water flow during the formation of the placer. The formation of technogenic spheroids is associated with the impact of high-temperature plasma on the concentrate enriched in placer gold and platinoids, which occurs during electric welding undertaken during the repair work of the flushing devices. The results of the study should help to avoid errors in the interpretation of the genesis of such gold and, as a result, in determining the nature of the primary sources of placers.
{"title":"The nature of spheroidal gold of the Middle Kyvvozh placer in the Middle Timan","authors":"M. Sokerin, Yu. Glukhov, Renat Shaybekov, B. Makeev, S. Zorina","doi":"10.19110/geov.2023.9.3","DOIUrl":"https://doi.org/10.19110/geov.2023.9.3","url":null,"abstract":"A comprehensive mineralogical study of 13 samples of spheroidal gold from schlich concentrates of the Middle Kyvvozh gold placer, which is part of the Kyvvozh gold placer field located in the central part of the Volsk-Vym ridge of the Middle Timan, was carried out. The presence of both natural and technogenic gold in concentrates was established. Natural placer spheroidal gold is characterized by a worn surface with oxide films and the development of a high-grade corrosion rim. Technogenic gold spheroids have a polygonal-mosaic tuberculate-pitted or smooth surface, the presence of aluminosilicate glasses and slags in the form of crusts or inclusions in the matrix, the presence of mineral inclusions and impurities of platinum group metals, tin and lead, which are not characteristic of native gold. Natural spheroids were formed by natural smoothing in the water flow during the formation of the placer. The formation of technogenic spheroids is associated with the impact of high-temperature plasma on the concentrate enriched in placer gold and platinoids, which occurs during electric welding undertaken during the repair work of the flushing devices. The results of the study should help to avoid errors in the interpretation of the genesis of such gold and, as a result, in determining the nature of the primary sources of placers.","PeriodicalId":23572,"journal":{"name":"Vestnik of geosciences","volume":"31 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138595035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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