Sobolev D.B.

dbsobolev@rambler.ru




Graduated from Moscow State University (1986), specialization «geological survey, prospecting and exploration of mineral deposits».
PhD in geology and mineralogy, Associate Professor.
Senior Researcher of Federal State Budgetary Institute of Science; acad. N.P. Yushkin Komi Research Center of the Ural Branch of the Russian Academy of Sciences (FGBUN IG Komi Scientific Center UB RAS).
Key fields of scientific research: paleontology (ostracods of the Lower Carboniferous), stratigraphy, facies analysis.
Author of more than 40 publications.
Stratigraphy and lithology
Section editor – PhD in geology and mineralogy Kirichkova A.I.
Article # 43_2018 submitted on 08/27/2018 displayed on website on 11/30/2018
30 p.
pdf Lithology and biostratigraphy of the Frasnian and border section on the Kosyu River (Subpolar Urals)
The Kedzydshor and Vorota Formations are divided by a clear lithological boundary inside the Early falsiovalis standard conodont subzone. The study of conodonts allowed for the first time in this area more reasonable to carry out a biostratigraphic subdivision of the studied section. The lower terrigenous part of the section (lower part of the Kedzydshor Formation) cannot be characterized by conodonts. In the upper part of the Kedzydshor and Vorota Formations nine associations of conodonts were determined. On the basis of selected layers with Polygnathus polloсki–Polygnathus ljaschenkoi, which probably occupy the transition zone between the Givetian and Frasnian stages and standard conodont zones and subzone: Early falsiovalis, Late falsiovalis, transitans, punctata, Early-Late rhenana of the Frasnian stage and Early-Middle-Late triangularis of the Lower Fammenian substage. A significant part of the described associations well correlates with the established conodont sequences in the Kozhym River section. The results of lithological and biostratigraphic studies of the Frasnian and border section on the Kosyu river (western slope of the Subpolar Urals) are presented. Sections are divided into Kedzydshor and Vorota Formations on the basis of lithological composition. The Kedzydshor formation is divided into upper and lower subformations. The lower part is composed of siltstones, quartz sandstones and limestones, and the upper part of gray, greenish-gray limestones and mudstones. Vorota Formation presented domanic type facies composed of dark gray and black limestones, mudstones and cherts.

Keywords: Upper Givetian, Frasnian, Lower Fammenian, conodonts, Kosyu River, Subpolar Urals.
article citation Soboleva M.A., Sobolev D.B., Matveeva N.A. Litologiya i biostratigrafiya razreza franskogo yarusa i pogranichnykh otlozheniy na r. Kos'yu (Pripolyarnyy Ural) [Lithology and biostratigraphy of the Frasnian and border section on the Kosyu River (Subpolar Urals)]. Neftegazovaya Geologiya. Teoriya I Praktika, 2018, vol. 13, no. 1, available at: http://www.ngtp.ru/rub/2018/43_2018.html
DOI https://doi.org/10.17353/2070-5379/43_2018
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   Soboleva M.A. Bioraznoobrazie konodontov vo franskom veke (opornyy razrez r. Kozhym, Pripolyarnyy Ural) [Biodiversity of conodonts in the Frasnien stage (reference section on the Kozhym River, Subpolar Urals)]. Sovremennaya mikropaleontologiya: trudy XVI Vserossiyskogo mikropaleontologicheskogo soveshchaniya, 2015, p. 77–81.
   Soboleva M.A. Konodonty i biostratigrafiya franskogo yarusa Pripolyarnogo i Polyarnogo Urala [Conodonts and biostratigraphy of the Frasnien stage of the Subpolar and Polar Urals]. Avtoreferat diss. na soisk. uch. step. k. g.-m. n. Syktyvkar: Geoprint, 2016, 23 p.
   Soboleva M.A. Novye vidy roda Palmatolepis (konodonty) iz franskikh otlozheniy Pripolyarnogo i Polyarnogo Urala [New species of the genus Palmatolepis (conodonts) from the Frasnian sediments of Subpolar and Polar Urals]. Syktyvkarskiy Paleontologicheskiy sbornik No 8. Syktyvkar: IG Komi NTs UrO RAN, 2017b, no. 130, p. 40–50.
   Soboleva M.A. Novye vidy roda Palmatolepis (konodonty) iz franskikh otlozheniy Pripolyarnogo i Polyarnogo Urala [New species of the genus Palmatolepis (conodonts) from the Frasnian sediments of Subpolar and Polar Urals]. Syktyvkarskiy Paleontologicheskiy sbornik No 8. Syktyvkar: IG Komi NTs UrO RAN, 2017b, no. 130, p. 40–50.
   Soboleva M.A. Rol' biofatsial'nogo analiza dlya ustanovleniya transgressivno-regressivnykh tsiklov i global'nykh sobytiy (na primere razreza franskogo yarusa r. Kos'yu) [The role of biofacial analysis to establish transgressive-regressive cycles and global events (by the example of the Frasnian strata section of the Kosyu river)]. Struktura, veshchestvo, istoriya litosfery Timano-Severoural'skogo segmenta: materialy 26-y nauchnoy konferentsii. 2017a, p. 210–221.
   Soboleva M.A. Rol' biofatsial'nogo analiza dlya ustanovleniya transgressivno-regressivnykh tsiklov i global'nykh sobytiy (na primere razreza franskogo yarusa r. Kos'yu) [The role of biofacial analysis to establish transgressive-regressive cycles and global events (by the example of the cut of the francian tier of the river Kosyu)]. Struktura, veshchestvo, istoriya litosfery Timano-Severoural'skogo segmenta: materialy 26-y nauchnoy konferentsii. 2017a, p. 210–221.
   Soboleva M.A., Sobolev D.B., Matveeva N.A. Razrez franskogo yarusa na r. Kozhym (zapadnyy sklon Pripolyarnogo Urala) – rezul'taty biostratigraficheskikh, bio-, litofatsial'nykh i izotopno-geokhimicheskikh issledovaniy [Frasnien section on the Kozhym River (the western slope of Polar Urals) - results of biostratigraphic, bio- and lithofacies, isotopic and geochemical studies]. Neftegazovaya Geologiya. Teoriya I Praktika, 2018, vol. 13, no. 1, available at: http://www.ngtp.ru/rub/2/2_2018.pdf. DOI: https://doi.org/10.17353/2070-5379/2_2018
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Stratigraphy and lithology
Section editor – PhD in geology and mineralogy Kirichkova A.I.
Article # 2_2018 submitted on 12/21/2017 displayed on website on 02/01/2018
55 p.
pdf  Frasnien section on the Kozhym River (the western slope of Polar Urals) - results of biostratigraphic, bio- and lithofacies, isotopic and geochemical studies
The results of biostratigraphic, bio-, lithofacial and isotope-geochemical studies of a unique section of the Frasnien stage of the western slope of the Subpolar Urals are presented. The section contains a rich and diverse fauna of conodonts, on the basis of which a continuous sequence of standard conodontic zones is established from Early falsiovalis (Lower Frasnien) to Early triangularis (Lower Famennien). Dedicated associations of conodonts with the predominance of deepwater taxa Ancyrodella, Mesotaxis and Palmatolepis not only allowed detailed biostratigraphic subdivision of the section, but also served as indicators of sea level changes. The basin of sedimentation during the Frasnien time was a deep-water basin on the shelf with a carbonate-clay-siliceous type of sedimentation. Despite the predominantly deep-water conditions of sedimentation, relative sea level changes were reconstructed on the basis of the obtained bio- and lithofacies data, which are compared with regional and global fluctuations. Isotope-geochemical analysis showed a non-uniform distribution of б13C (from -3.1 to + 3.5‰) and б18O (from +19.6 to + 28.1‰) in the section, with numerous positive and negative excursions, which indicates repeated changes in the conditions of sedimentation. High values of б13C with sharp amplitudes of deviations are associated with manifestations of events caused by increased bioproductivity during transgressions. As a result of the carried out researches in the section of the western slope of the Subpolar Urals, traces of six Frasnien global geological events have been revealed: Genundewa, Timan, Middlesex, Semichatovae, Lower Kellwasser and Upper Kellwasser. Established biotic changes, accompanied by an increase in the taxonomic diversity of conodonts or a reduction to the point of complete extinction, sedimentological signs and anomalies of б13C and б18O are a consequence of the large transgressions that are associated with the manifestation of these global geological events

Keywords: isotope composition of carbon and oxygen, conodontic biofacies, global events, Frasnien sedimentation conditions, Kozhym River, Subpolar Urals.
article citation Soboleva M.A., Sobolev D.B., Matveeva N.A. Razrez franskogo yarusa na r. Kozhym (zapadnyy sklon Pripolyarnogo Urala) – rezul'taty biostratigraficheskikh, bio-, litofatsial'nykh i izotopno-geokhimicheskikh issledovaniy [Frasnien section on the Kozhym River (the western slope of Polar Urals) - results of biostratigraphic, bio- and lithofacies, isotopic and geochemical studies]. Neftegazovaya Geologiya. Teoriya I Praktika, 2018, vol. 13, no. 1, available at: http://www.ngtp.ru/rub/2/2_2018.pdf
DOI https://doi.org/10.17353/2070-5379/2_2018
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Stratigraphy and lithology
Section editor – PhD in geology and mineralogy Kirichkova A.I.
Article # 034 displayed on website on 08/28/2007
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pdf  Upper Devonian - Lower CarboniferousKodzydelskaya suite of the Northern Urals(new stratigraphic volume)
The article provides lithological and biostratigraphic characteristics of the Kodzydelskaya suite (Late Famennian Early Tournaisian, Northern Urals) in the model section. The volume of the suite has been clarified. The features of the Kodzydelskaya suite that differ it from the underlying and overlying sediments are: the presence of fragmental limestone layers (up to conglobreccia), the predominance of organo-detritic carbonates with heterogeneous distribution of detritus.
Key words: Upper Devonian, Lower Carboniferous, Kodzydelskaya suite, Northern Urals.
article citation Zhuravlev A.V., Sobolev D.B. Upper Devonian - Lower Carboniferous Kodzydelskaya suite of the Northern Urals (new stratigraphic volume) // Neftegazovaya Geologiya. Teoriya I Praktika. – 2007. - V.2. - http://www.ngtp.ru/rub/2/034.pdf