litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/2500-302X-2026-26-1-122-143JGCJVQlitosphere-2455Research ArticleСтатьиArticlesОтражение глобального среднелудфордского события Лау в разрезе силура на западном склоне Приполярного УралаTraces of the global Ludford Lau event in a section of the Silurian Sizim horizon on the western slope of the Subpolar UralsБезносоваТ. М.BeznosovaT. M.

167982, г. Сыктывкар, ул. Первомайская, 54

Tat’yana M. Beznosova

54 Pervomaiskaya st., Syktyvkar 167982

beznosova@geo.komisc.ruМатвеевВ. А.MatveevV. A.

167982, г. Сыктывкар, ул. Первомайская, 54

Vladimir A. Matveev

54 Pervomaiskaya st., Syktyvkar 167982

beznosova@geo.komisc.ruИнститут геологии им. академика Н.П. Юшкина ФИЦ Коми НЦ УрО РАНРоссияN.P. Yushkin Institute of Geology, FRC Komi SC UB RASRussian Federation202621022026261122143Copyright © Безносова Т.М., Матвеев В.А., 20262026Безносова Т.М., Матвеев В.А.Beznosova T.M., Matveev V.A.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/2455

Объект исследования. Изложены новые результаты изучения глинисто-карбонатных отложений сизимского горизонта среднего и верхнего лудлова (лудфордия) в опорном разрезе силура на западном склоне Приполярного Урала. Материалы и методы. Основой для исследований послужили детальные описания разрезов, представительные коллекции образцов осадочных пород с ископаемой фауной, собранные авторами из отложений верхнего силура в разные годы во время полевых работ на западном склоне Приполярного Урала, поднятиях Чернова и Чернышева, а также полученные новые С-изотопные данные. Результаты. Впервые установлен биостратиграфически датированный интервал с положительными значениями δ13С, маркирующий среднелудфордское изотопное событие Лау в разрезе лудлова на Приполярном Урале. Изотопная кривая имеет отчетливый положительный тренд в этом интервале. Ранее установленный положительный изотопный экскурс раннепржидольского события Клев в основании белушьинского горизонта пржидола фиксирует рубеж лудлова и пржидола в этом же разрезе на Приполярном Урале. Выводы. Проведенное комплексное изучение последовательного изменения фаций, состава биоты и поведения стабильных изотопов углерода в разрезе сизимского горизонта способствовало обоснованной идентификации стратиграфического интервала проявления глобального биотического и изотопного среднелудфордского события Лау на западном склоне Приполярного Урала.

Research subject

Research subject. To present new results obtained when studying clayey-carbonate deposits of the Sizim Regional Stage of the Upper Ludlow in the Silurian reference section on the western slope of the Subpolar Urals.

Materials and methods

Materials and methods. Representative collections of sedimentary rock samples with fossil fauna collected by the authors from Upper Silurian deposits in different years during fieldwork on the western slope of the Subpolar Urals, the Chernov and Chernyshev Uplifts, as well as new C-isotope data, were used.

Results

Results. For the first time, a biostratigraphically dated interval with positive δ13C values marking the Middle Ludford Lau isotope event in the Upper Ludlow section of the Subpolar Urals has been distinguished. The isotope curve has a stepped structure and records a distinct positive trend. The previously determined positive isotope excursion of the Early Pridolian Klev Event at the base of the Belush’ya Regional Stage of the Pridoli marks the boundary of the Ludlow and Pridoli in the same section of the Subpolar Urals.

Conclusions

Conclusions. The conducted integral study of successive changes in facies, biota composition, and behavior of stable carbon isotopes in the Sizim Regional Stage section on the western slope of the Subpolar Urals made it possible to identify the manifestations of the global biotic and isotopic Middle Ludford Lau Event.

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