litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2026-26-4-835-856YVOIZSlitosphere-2547Research ArticleСтатьиArticlesПограничные отложения лландовери и венлока в разрезе силура на поднятии Чернова (Арктический регион Европейского Северо-Востока России)Llandovery and Wenlock boundary deposits in the Silurian section at the Chernov Uplift (Arctic region of European north-east of Russia)МатвеевВ. А.MatveevV. A.

167982, г. Сыктывкар,  ул. Первомайская, 54

54 Pervomaiskaya st., Syktyvkar 167982

vamatveev@geo.komisc.ruБезносоваТ. М.BeznosovaT. M.

167982, г. Сыктывкар,  ул. Первомайская, 54

54 Pervomaiskaya st., Syktyvkar 167982

Институт геологии им. академика Н.П. Юшкина ФИЦ Коми НЦ УрО РАНРоссияN.P. Yushkin Institute of Geology, FRC Komi SC UB RASRussian Federation202629082026264835–856Copyright © Матвеев В.А., Безносова Т.М., 20262026Матвеев В.А., Безносова Т.М.Matveev V.A., Beznosova T.M.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/2547

Объект исследования. В статье приведены новые результаты изучения строения пограничных отложений лландовери и венлока в разрезе безымянной свиты на поднятии Чернова. Материалы и методы. Основой для исследований послужили послойное описание разрезов, представительные коллекции образцов осадочных пород с ископаемой фауной, а также полученные изотопные данные δ13Скарб и δ18Oкарб. Результаты. Выявленные изменения в обстановках осадконакопления и распределении различных групп фаунистических остатков, а также установленные позитивные отклонения изотопов углерода и кислорода в стратиграфическом интервале разреза мощностью 51.5 м свидетельствуют о перерыве в осадконакоплении и экосистемной перестройке на рубеже лландовери и венлока, совпадающей с глобальным биотическим и изотопным событием Иревикен. Выводы. Анализ таксономического состава биоты, распределения значений изотопов углерода и кислорода в пограничных отложениях лландовери и венлока безымянной свиты, а также проведенная их био- и хемостратиграфическая корреляция с одновозрастными отложениями на о-ве Готланд, в Подолии, Эстонии, Китае указывают на проявление раннешейнвудского события Иревикен в разрезе Безымянный на поднятии Чернова.

Research subject. This article presents new research data on the structural features of the Llandovery and Wenlock Series in the Bezymyannyj Formation section at the Chernov Uplift. Materials and methods. The research was based on a layer by-layer section descriptions and representative collections of sedimentary rock samples containing fossil fauna, as well as obtained isotope data (δ13Ccarb and δ18Ocarb ). Results. Changes in sedimentation environments and the distribution of various groups of faunal remains were identified, along with positive deviations in carbon and oxygen isotopes within a 51.5 m thick stratigraphic interval. This indicates a hiatus in sedimentation and an ecosystem reorganization at the Llandovery–Wenlock boundary. These changes coincide with the global biotic and isotopic Ireviken Event. Conclusions. The analysis of the taxonomic composition of the biota, as well as the distribution of carbon and oxygen isotope values in the boundary deposits of the Llandovery–Wenlock Series of the Bezymyannyj Formation, as well as the performed bio-chemostratigraphic correlation with coeval deposits on the island of Gotland, in Podolia, Estonia, and China, indicates an Early Sheinwoodian Ireviken Event in the Bezymyannyj section at the Chernov Uplift.

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The authors declare that there are no conflicts of interest present.