Southern Timan Research Articles

Icriodus multidentatus sp. nov. and I. quartadecimensis sp. nov.—New Conodont Species from the Frasnian Stage of the Southern Timan

Icriodus multidentatus sp. nov. and I. quartadecimensis sp. nov.—New Conodont Species from the Frasnian Stage of the Southern Timan

К вопросу о возрасте джежимской свиты Южного Тимана

We have described jasper pebbles from gravelites of the Dzhezhim formation on the Zhezhimparma uplift in the Southern Timan. The chip has a zonal structure. The central part is composed of devitrified volcanic glass and is surrounded by the rocks with an oolitic and crustified structure, composed of hematite-pigmented microgranular hexagonal quartz aggregates. We made a conclusion that one of the sources of the detrital material was rocks of timanide (preuralide) orogen, which final collision stage was Late Vendian by the age.

Geochemical Characteristics of Upper Proterozoic and Paleozoic Terrigenous Deposits in Their Contact Zone (Southern Timan)

Geochemical Characteristics of Upper Proterozoic and Paleozoic Terrigenous Deposits in Their Contact Zone (Southern Timan)

Geochemistry of High-Phosphorus Zircon from the Upper Riphean Sandstones of the Southern Timan

Geochemistry of High-Phosphorus Zircon from the Upper Riphean Sandstones of the Southern Timan

Ostracod zonation of the Givetian-Frasnian boundary interval in the Timan-North Urals Region

Research subject.Ostracods and Givetian-Frasnian boundary deposits of the Timan-North Urals Region.Materials and methods.The work was based on the results of studying ostracods from the stratotype sections of the Southern Timan, which are considered referential for regional and global correlations. The analysis of the distribution intervals of the most significant taxa was based on the results of previous studies, both published and archival materials on the Timan-Urals Region. Ostracods were considered in association with conodonts, which is an important criterion for applying a reasonable biostratigraphic subdivision. The use of different-scale regional cyclicity of sedimentation and individual “marking” levels of manifestation of global events were shown.Results.The ostracod distribution in the Givetian-Frasnian boundary interval of the Timan-Northern Urals region was analyzed. The following most significant taxa were identified: Cavellina devoniana, Cavellina uchtensis, Cavellina batalinae, Cavellina chvorostanensis, Nodella faceta, Nodella ex gr. hamata. The correlation of established assemblages with ostracods from the Franco-Belgian basin was shown. The difference consists in the absence of a polyzygid assemblage with Polyzygia beckmanni beckmanni, which was established at the base of the Nismes Formation of Belgium near the historical boundary between the Givetian and Frasnian stages. The determined relationship of biostratigraphic data in combination with the transgressive-regressive sequence of sedimentation shows a more reasonable solution to the problem of the position of the lower boundary of the Frasnian stage of the Upper Devonian in the Timan-Northern Urals Region.Conclusions.An updated version of the scheme of zonal subdivision of the Givetian-Franian boundary interval in the Timan- Northern Urals region has been developed, taking into account the ostracod distribution of the Cavellinidae and Nodellidae families, as well as the discrepancies in the levels of the first appearance of index species and the boundaries of zones in the regional stratigraphic scheme. The correlation of ostracod zones relative to the conodont scale is shown.

Циркон как источник генетической информации в верхнерифейских терригенных отложениях Южного Тимана

Zircon is an important source of genetic information. The purpose of the research is a detailed study, identification of diagnostic features, and determination of the evolution of the composition of zircon, which will make it possible to establish the sources of clastic material and the conditions for the formation of the paleontologically mute terrigenous Dzhezhim Formation on the Dzhzhimparma Rise (Southern Timan). The article presents the results of the study of zircon from the Upper Proterozoic metasedimentary deposits of the South Timan by Raman spectroscopy. According to morphological features, chemical composition, internal structure and degree of crystallinity, four types of zircon have been distinguished. The Raman spectra of all morphological types of the studied mineral was surveyed. A comparative analysis of the Raman characteristics showed that the first type is characterized by the highest degree of crystallinity, the third type is characterized by the minimum, and the second type occupies an intermediate position. The fourth type is a unique highphosphorus zircon, the nature of its spectra reflects the presence of Y, P, REE, and other impurity elements, and also indicates its metamictization as a result of radiation damage to the structure. Morphological features, differences in the chemical composition and characteristics of the Raman spectra of the distinguished types of zircon indicate the difference in the sources from which they entered the sedimentary rock. The source of type I zircon could be felsic igneous rocks. Type II and III zircons are probably of metamorphogenic origin. The formation of the modern composition and appearance of zircons of the fourth type, the formation of which is associated with a high-temperature magmatic source, is due to multiphase transformations in hydrothermal-metamorphic and epigenetic processes. We believe that type IV zircons have the longest history of existence. This is evidenced by their high metamict, i.e., the destruction of the crystal lattice under the action of U and Th radiation, which depends on their number and the age of zircon grains. It is known that the age of zircon of the Dzhezhim Formation is pre-Upper Riphean; during its existence, the mineral was repeatedly subjected to various external influences that changed the parameters of its crystal structure.

Criteria for the searching for hydrocarbon deposits and polymetal ores using the geofluidic system model

This work is a continuation of a cycle of studies on the generalization of geochemical information on the content of elements in the composition of rocks and oils in the area of the Ukhta anticline of Southern Timan region. Based on the values of yttrium (Y/Ho) and cerium anomalies (Ce sample/Ce*PAAS) established in modern sedimentary basins, the studied rocks of the Upper Devonian are divided according to the conditions of formation and transformation into predominantly hydrothermal and hydrogenous. It is shown that, depending on these conditions; zones of hydrothermal and hydrogenous mineralization with an increased content of Zn, Cu, Co, V, Mn, and Mo are formed. As a result of a comparative analysis of the content of elements in oils and the values of geochemical ratios U/Th, V/Ba, Th/Ba, As/Ba, three types of oils were identified: Yaregsky, Nizhnechutinsky high-temperature, and Nizhnechutinsky low-temperature. The values of these indicators are considered as search criteria for a certain type of oil.

Typomorphic Features of Garnets and Zircons from the Middle Neopleistocene Moraines in the Northern and Southern Timan–Pechora–Vychegda Region

Typomorphic Features of Garnets and Zircons from the Middle Neopleistocene Moraines in the Northern and Southern Timan–Pechora–Vychegda Region

Provenance and U–Pb Ages of Detrital Zircons from the Sandstones of the Middle Devonian Asyvvozh Formation, Dzhezhimparma Highland, Southern Timan

Results of U–Pb dating of detrital zircon grains from diamond-bearing sandstones of the Middle Devonian Asyvvozh Formation in the Southern Timan are presented. It was established that the sandstones do not contain zircon grains younger than the Middle Riphean. The datings of 92 zircon grains fall in the interval of 1144 ± 36 to 3090 ± 19 Ma, and the difference between the depositional age of the Middle Devonian sandstones and the age of the youngest zircons is around 750 m.y. The main sources of terrigenous material during the deposition of the Asyvvozh sandstones were the crystalline complexes of the ancient basement of the East European Craton (the central regions of Volga–Uralia) and the complexes of accretionary orogens on the margins of Baltica. The presumably Cambrian kimberlites located within the Komi–Permyak and Sysola arches of the basement of the East European Craton could have been the sources of diamonds.

Shell Microstructure in Representatives of the Genus Lingulipora Girty from the Frasnian (Upper Devonian) Deposits of Southern Timan

The microstructure of the shell material in the protegulum brephic shells, and adult shells of Lingulipora gradata Batrukova, 1955 from the Upper Devonian deposits (Frasnian Stage) of South Timan is described. The structure of the interior part of the ventral valve was studied. The character of porosity was different in two species of the genus Lingulipora.

Обоснование методики комплексного изучения отложений доманикового типа по материалам новых скважин Ухтинского района (Южный Тиман)

Обоснование методики комплексного изучения отложений доманикового типа по материалам новых скважин Ухтинского района (Южный Тиман)

The chemical composition and age of monazite and kularite from titanium ore of Pizhemskoye and Yarega deposits (Middle and Southern Timan)

A study on the typomorphic characteristics and age of the monazite the two giant titanium deposits of the Timan – Pizhemskoye and Yarega, which revealed differences in morphology in the species composition of the inclusions, the grain size, distribution of chemical types of a mineral associated with conditions of crystallization and different sources of the substance. The isochronous Th-Pb monazite age was calculated using the «CHIME» method. For Yarega monazite built three isochrone with age 1301, 1105 and 778 Ma; for Pizhemsky monazite-kularite one isochrone with age 782 Ma. Source of hith-Th monazite Yarega oil-titanium deposit could be ancient granite batholith and the origin Yarega less-Th monazite and Nd-Ce-monazite-kularite Pizhemskoye deposit with an age of ~ 780 Ma could be related to the hydrothermal conversion of the weathering crusts on lamprophyres close in age with lamprophyre (spessartite and kersantite) of Chetlassky Kamen.

New Spiriferids (Brachiopoda) from the Upper Devonian of the Central Devonian Field and Southern Timan

New spiriferid taxa Judinica gen. nov. with Judinica siratchoica sp. nov. and J. pseudodeflexa sp. nov. and Ukhtomica gen. nov. with Ukhtomica lata sp. nov. are established in the result of revision of Adolfia and Adolfispirifer from the Middle Frasnian of the Central Devonian Field (punctata–jamieae Zones) and Upper Frasnian of southern Timan (Lower rhenana Zone).

Особенности строения микробных образований в системе «риф — лагуна» (на примере верхнедевонского рифового комплекса Седъю, Южный Тиман)

Особенности строения микробных образований в системе «риф — лагуна» (на примере верхнедевонского рифового комплекса Седъю, Южный Тиман)

Конодонты и остракоды из мелководных живетско-франских отложений Южного Тимана

Конодонты и остракоды из мелководных живетско-франских отложений Южного Тимана

Палинологическая характеристика живетско-франского стратиграфического интервала на Южном и Среднем Тимане

Палинологическая характеристика живетско-франского стратиграфического интервала на Южном и Среднем Тимане

Composition and formation conditions of the Upper Riphean terrigenous rocks (Dzhezhimparma Uplift, Southern Timan)

The results of the study of the composition of the Upper Riphean terrigenous rocks of Dzhezhimparma Uplift at Southern Timan have been presented. On the basis of the lithological, geochemical and mineralogical data, the sedimentary material has been determined to be accumulated in the shore-marine extremely shallow-water conditions of a passive continental margin. The formation of the composition of the rocks involved the eroding products of the metamorphites of the ancient continent and slightly altered in a cold climate acid magmatic rocks. The postsedimentation transformations of the Upper Riphean rocks correspond to the stage of the late diagenesis-initial catagenesis.

Polar lipid pool modification in leaves of hoary plantain (Plantago media L.) plants during their light adaptation under natural conditions

Polar glycerolipids and photosynthetic pigments of Plantago media L. plants, growing on limestone outcrops of the Southern Timan, have been studied. Leaves of plants growing on well insolated and heated slopes are characterized by an intensive lipoperoxidation; the accumulation of chlorophylls and carotenoids in these plants is 1.5-2 times less and the content of polar lipids is 15-20% less than in plants growing in dense grass at the bottom of slopes. The accumulation of some classes of glycerolipids in leaves in the daytime provides for stabilization of photosystem complexes and the formation of the pool of zeaxanthin, a protective xanthophyll. Changes in the content and ratio of lipids represent an important part of the adaptive reorganizations of the photosynthetic apparatus caused by excess radiation under natural conditions.

Spiriferid genus Warrenella from the Upper Devonian of Southern and Middle Timan

Nordella orbiculata (Ljaschenko, 1959) and N. subquadrata Ljaschenko, 1973 are revised based on the topotypical material from the collection of A.I. Ljaschenko. Based on data on the morphology, microornamentation, and shell structure Nordella is shown to have characters closely similar to Warrenella Crickmay, 1953 and, therefore, should be considered as its junior synonym. A new species, W. timanimedia sp. nov., is described from the Upper Devonian of Middle Timan.

Tentaculitids in palynological preparations: New evidence from the Famennian (Late Devonian) of Southern Timan

This is the first report of organic tentaculitid remains (zoomorphs) in palynological preparations of Famennian Age (Southern Timan, borehole Sosnovka-1). Earlier two similar finds have been described from the Frasnian of Poland as similar to embryonic and juvenile forms of dacryoconarids belonging to the orders Nowakiida and Stylionida.