Sokolova L.V.
sokolova@geo.komisc.ru
Graduated from Syktyvkar State University (2005), specialization "biology".PhD in Geological and Mineralogical Sciences.
Researcher, Institute of Geology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences
Area of scientific interests: stratigraphy, Silurian conodonts.
Author of 14 publications.
Stratigraphy and lithology
| Article # 15_2024 | submitted on 04/10/2024 displayed on website on 05/29/2024 |
| 21 p. | Sokolova L.V., Dan'shchikova I.I., Ul'nyrov I.L. |
| The characteristics of boundary strata of the pre-Greben regional unconformity from Upper Silurian of the Chernov Swell (Sizimselebeyshor creek) according to the conodonts chronostatigraphy | |
| Upper Silurian conodonts from the outcrop of the Sizimselebeishor Creek were studied for the first time. A sequence of four associations conodonts of different taxonomic structure has been established throughout the boundary of the pre-Greben regional unconformity in the Sizimselebeyshor Creek. Association 1 with the dominant regional species Ctenognathodus (?) sp. A is dated below the surface of the unconformity. Association 2 with Ozarkodina confluence (Branson et Mehl, 1933), Oz. cornidentata Viira, 1983 and Coryssognathus dubius (Rhodes, 1953) was fixed in section, which directly underlying the unconformity. Association 3 with Panderodus equicostatus (Rhodes, 1953) and Wurmiella excavata (Branson et Mehl, 1933) was established directly overlapping the discordance. Both borderland associations 2 and 3 are represented by species of wide geographical and long-term stratigraphic distribution. Association 4 with species Zieglerodina cf. ivochlupaci Carls, Slavik, Valenzuella-Rios, 2007 and Oz. denticulata Viira, 2000 Pridoly age is dated above the pre-Greben unconformity also. An auxiliary biostratigraphic division - layers with Ctenognathodus (?) sp. A of Gerdyu time (Ludlow) was identified as a result of correlation the studied interval with the boundary strata of Gerdyu regional stage (Ludlow) and Greben regional stage (Pridoli) of the reference section of the Kozhym River of the western slope of the Subpolar Urals. The layers are characterized by the joint presence of conodonts Ctenognathodus (?) sp. A and Ozarkodina confluens (Branson et Mehl, 1933), zonal brachiopod species Didymothiris didyma (Dalman, 1828) and the development of stromatolites interlayers. Keywords: conodonts, Upper Silurian, Gerdyu regional stage, Greben regional stage, pre-Greben regional unconformity, Sizimselebeyshor Creek, Chernov Swell. |
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| article citation | Sokolova L.V., Dan'shchikova I.I., Ul'nyrov I.L. Kharakteristika po konodontam pogranichnykh otlozheniy predgrebenskogo nesoglasiya v verkhnem silure podnyatiya Chernova (ruchey Sizimtselebeyshor) [The characteristics of boundary strata of the pre-Greben regional unconformity from Upper Silurian of the Chernov Swell (Sizimselebeyshor creek) according to the conodonts chronostatigraphy]. Neftegazovaya Geologiya. Teoriya I Praktika, 2024, vol. 19, no. 2, available at: https://www.ngtp.ru/rub/2024/15_2024.html EDN: UJJBXO |
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Antropova E.V., Sokolova L.V. Novye dannye o siluriyskikh stromatoporoideyakh i konodontakh razreza r. Padimeytyvis (podnyatie Chernova) [New data on Silurian stromatoporoidea and conodonts of the Padimeytivis river section (Chernov swell)]. Struktura, veshchestvo, istoriya litosfery Timano-Severoural'skogo segmenta: materialy 25-y nauch. konf. In-ta geologii Komi NTs UrO RAN. Syktyvkar, 2016, pp. 3-7. (In Russ).
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Beznosova T.M. Soobshchestva brakhiopod i biostratigrafiya verkhnego ordovika, silura i nizhnego devona severo-vostochnoy okrainy paleokontinenta Baltiya [Brachiopod communities and biostratigraphy of the Upper Ordovician, Silurian and Lower Devonian of the Northeastern margin of the Baltic paleocontinent]. Ekaterinburg: UrO RAN, 2008, 218 p. (In Russ).
Beznosova T.M., Matveev V.A., Puchkov V.N., Silaev V.I. Pereryv v osadkonakoplenii na granitse ludlova i przhidola v razreze silura na Pripolyarnom Urale [A break in sedimentation at the Ludlow - Pridoly boundary in the Silurian section in the Subpolar Urals]. Litosfera, 2020b, no. 6(20), pp. 791-807. (In Russ). DOI: 10.24930/1681-9004-2020-20-6-791-807
Beznosova T.M., Matveev V.A., Shamsutdinova L.L. Novye dannye po stratigrafii i obnovlennaya skhema korrelyatsii verkhnego ordovika i silura Timano-Pechorskoy neftegazonosnoy provintsii i severa Urala [New stratigraphic data and an updated correlation scheme of the Upper Ordovician and Silurian of the Timan-Pechora petroleum province and the north of the Urals]. Izvestiya Komi nauchnogo tsentra UrO RAN. Seriya «Nauki o Zemle». 2020a, no. 6(46), pp. 75-89. (In Russ). DOI: 10.19110/1994-5655-2020-6-75-89
Beznosova T.M., Matveev V.A., Sokolova L.V. Biostratigraficheskiy i sobytiyno-stratigraficheskiy rubezh ludlova i przhidola na zapadnom sklone Pripolyarnogo Urala [Biostratigraphic and event-stratigraphic boundary of Ludlow and Pridoly on the Western slope of the Subpolar Urals]. Vestnik Instituta geologii Komi NTs UrO RAN, 2018, no. 11, pp. 31-37. (In Russ). DOI: 10.19110/2221-1381-2018-11-31-37
Beznosova T.M., Matveev V.A., Sokolova L.V., Kanev B.I. Regional'noe proyavlenie global'nogo ludfordskogo sobytiya (Lau Event) v razreze zapadnogo sklona Urala [Regional manifestation of the global Ludfordian event (Lau Event) in the context of the western slope of the Urals]. Geodinamika, veshchestvo, rudogenez Vostochno-Evropeyskoy platformy i ee skladchatogo obramleniya: materialy Vserossiyskoy nauchnoy konferentsii s mezhdunarodnym uchastiem. Syktyvkar: IG Komi NC UrO RAS, 2017, pp. 19-21. (In Russ).
Carls P., Slavík L., Valenzuela-Ríos J.I. Revisions of conodont biostratigraphy across the Silurian-Devonian boundary. Bulletin of Geosciences, 2007, 82(2), pp. 145-164. DOI: 10.3140/bull.geosci.2007.02.145
Chernov G.A. Paleozoy Bol'shezemel'skoy tundry i perspektivy ego neftegazonosnosti [Paleozoic of the Bolshezemelskaya tundra and prospects of its petroleum potential]. Moscow: Nauka, 1972, 313 p. (In Russ).
Chernov G.A. Siluriyskie otlozheniya podnyatiya Chernova (Bol'shezemel'skaya tundra) [Silurian strata of the Chernov Uplift (Bolshezemelskaya tundra)]. Doklady Akademii nauk SSSR, 1964, vol. 156, no. 4, pp. 843-846. (In Russ).
Dan'shchikova I.I., Ul'nyrov I.L., Maydl' T.V. Litologicheskaya kharakteristika predgrebenskogo nesoglasiya v razreze ruch'ya Sizimtselebeyshor podnyatiya Chernova [Lithological characteristics of the pre-Greben regional unconformity of the Sizimcelebeyshor Creek of the Chernov Uplift]. Vestnik Instituta geologii Komi NTs UrO RAN, 2022, 12 (336), pp. 3-10. (In Russ). DOI: 10.19110/geov.2022.12.1
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Ivanov K.S. Metody poiskov i vydeleniya konodontov. Metodicheskie rekomendatsii [Methods of search and selection of conodonts. Methodological recommendations]. Sverdlovsk, 1987, 117 p. (In Russ).
Klapper G., Murphy M.A. Silurian - Lower Devonian conodont sequence in the Roberts Mountains Formation of the central Nevada. University of California publications in geological sciences. USA: University of California Press Berkeley and Los Angeles California, 1974, vol. 111, 87 p.
Knyazev S.A. Siluriyskie otlozheniya tsentral'noy chasti podnyatiya Chernova [Silurian strata of the central part of the Chernov Uplift]. Materialy po geologii i poleznym iskopaemym Severo-Vostoka Evropeyskoy chasti SSSR. Syktyvkar, 1965, pp. 112-120. (In Russ).
Kotik I.S., Maydl' T.V., Kotik O.S., Pronina N.V. Neftegazomaterinskie otlozheniya silura podnyatiya Chernova (Timano-Pechorskiy basseyn) [Petroleum source rocks of the Silurian strata on the Chernov swell (Timan-Pechora basin)]. Georesursy, 2020, 22(3), pp. 12-20. (In Russ). DOI: 10.18599/grs.2020.3.12-20
Margulis E.A. Neftegazonosnye kompleksy Pechorskogo shel'fa [Oil-gas complexes of the Pechora shelf]. Neftegazovaya Geologiya. Teoriya I Praktika, 2009, vol. 4, no. 3, available at: http://www.ngtp.ru/rub/5/35_2009.pdf (In Russ).
Martynov A.V. Litologo-fatsial'nye kriterii prognoza neftegazonosnosti ordoviksko-nizhnedevonskikh otlozheniy Timano-Pechorskoy provintsii [Lithological and facies criteria for predicting the petroleum potential of the Ordovician-Lower Devonian strata of the Timan-Pechora province]. St. Petersburg, 1998, 27 p. (In Russ).
Mathieson D., Mawson R., Simpson A.J., Talent J.A. Late Silurian (Ludlow) and Early Devonian (Pragian) conodonts from the Cobar Supergroup, western New South Wales, Australia. Bulletin of Geosciences, 2016, 91(3), pp. 583-652. DOI: 10.3140/bull.geosci.1593
Melnikov S.V. Konodonty ordovika i silura Timano-Severoural'skogo regiona. [Ordovician and Silurian conodonts of the Timan-North Ural region]. St. Petersburg: Izd-vo Sankt-Peterburgskoy kartograficheskoy fabriki VSEGEI, 1999a, 136 p. (In Russ).
Mel'nikov S.V. Melkovodnye konodonty silura v opornom razreze Pripolyarnogo Urala (r. Kozhym) [Shallow-water conodonts of the Silurian in the reference section of the Subpolar Urals (Kozhim River)]. Geologiya i mineral'nye resursy evropeyskogo severo-vostoka Rossii: novye rezul'taty i novye perspektivy: materialy XIII Geologicheskogo s"ezda Respubliki Komi. Syktyvkar, 1999b, vol. II, pp. 275-278. (In Russ).
Miller C.G., Aldridge R.J. The taxonomy and apparatus structure of the Silurian distomodontid conodont Coryssognathus Link & Druce, 1972. J. Micropalaeontology, 1993, 12(2), pp. 241-255.
Murphy M.A., Valenzuela-Ríos J.I., Carls P. On classification of Přidoli (Silurian)-Lochkovian (Devonian) Spathognathodontidae (Conodonts). University of California, Riverside Campus Museum Contribution 6, 2004, 25 p.
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Stratigraphy and lithology
| Article # 33_2023 | submitted on 07/20/2023 displayed on website on 09/06/2023 |
| 22 p. | Sokolova L.V., Nechaev M.S., Kotik I.S. |
| New data about the age of the Dershor Formation (Lower Devonian) on the Chernyshev swell (Timan-Pechora petroleum province) | |
| Lithological and biostratigraphical studies of the stratotyp section of the Lower Devonian Dershor Formation, represented in outcrops in the north of the Chernyshev swell, have been carried out. In the section of the Dershor Formation, a sequence of five conodont associations of different taxonomic structure and age has been established: ass. I c Pelekysgnathus of Early Devonian age, ass. II c Lanea of Middle Lochkovian age, ass. III c Pandorinellina cf. optima of Middle Lochkovian age, ass. IV c Pandorinellina exigua cf. philipi of Late Lochkovian age and ass. V with Pandorinellina cf. paridens of the Late Lochkovian – Pragian age. The species Amydrotaxis cf. chattertoni, Oulodus astriatus, Ozarkodina cf. mashkovae, Zieglerodina cf. paucidentata and Pandorinellina cf. paridens were identified for the first time in the conodont fauna of the Dershor Formation. As a result of the conodonts study from this typical section of Dershor Formation, isolated in the volume of the Ovinparm regional stage, the problem of the presumably younger (Sotchemkyrt) age of the strata of the greater upper part of the Dershor Formation is identified. Keywords: conodont, stratotyp section, Lower Devonian, Dershor Formation, Lochkovian Stage, Ovinparm regional stage, Sotchemkyrt regional stage, Chernyshev swell, Timan-Pechora petroleum province. |
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| article citation | Sokolova L.V., Nechaev M.S., Kotik I.S. Novye dannye o vozraste dershorskoy svity (nizhniy devon) gryady Chernysheva (Timano-Pechorskaya neftegazonosnaya provintsiya) [New data about the age of the Dershor Formation (Lower Devonian) on the Chernyshev swell (Timan-Pechora petroleum province)]. Neftegazovaya Geologiya. Teoriya I Praktika, 2023, vol. 18, no. 3, available at: http://www.ngtp.ru/rub/2023/33_2023.html EDN: XZZCRW |
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Geochemical research
Section editor – PhD in geology and mineralogy Bazhenova T.K.
| Article # 41_2017 | submitted on 09/07/2017 displayed on website on 12/11/2018 |
| 15 p. | Kotik I.S., Kotik O.S., Valyaeva O.V., Sokolova L.V. |
| Silurian and Lower Devonian petroleum source rocks of the Chernov Ridge (Timan-Pechora Basin, Russia) | |
| The article presents the results of geochemical research of Silurian and Lower Devonian sequences on the Chernov ridge. The main part of the section is represented by petroleum source rocks with (TOC concentrations of 0,1–0,5%). Petroleum source rocks with increased contents of organic matter (> 0,5%) belong to clay-carbonate intervals in Silurian part of the section and layers of bituminous dolomites in the Lower Devonian. The hydrocarbon composition of the saturated fraction of bitumen in the Silurian-Lower Devonian deposits show a sapropel organic matter, probably of a different genetic types – plankton and marin algae. The isotopic composition of organic carbon (?13С, ‰) of bitumen part (30,1–32,6‰) and kerogen component (30,9–31,1‰) confirms the sapropel genesis of organic matter. The level of catagenetic transformation, estimated by the conodont colour alteration index, indicates that the Silurian-Lower Devonian deposits are in the main zone of oil generation (subdivision of the catagenesis MK1-2). The process of hydrocarbon generation is confirmed by the presence of bitumen throughout the section of the Silurian and Lower Devonian sequences.
Keywords: Silurian and Lower Devonian sequences, source rock, organic matter, bitumen, isotopic composition of organic carbon, Chernov ridge, Timan-Pechora Basin. |
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| article citation | Kotik I.S., Kotik O.S., Valyaeva O.V., Sokolova L.V. Neftegazomaterinskie porody siluriyskikh i nizhnedevonskikh otlozheniy zapadnoy chasti podnyatiya Chernova [Silurian and Lower Devonian petroleum source rocks of the Chernov Ridge (Timan-Pechora Basin, Russia)]. Neftegazovaya Geologiya. Teoriya I Praktika, 2017, vol. 12, no. 4, available at: http://www.ngtp.ru/rub/1/41_2017.pdf |
| DOI | https://doi.org/10.17353/2070-5379/41_2017 |
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