litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2023-23-2-165-178litosphere-1842Research ArticleСтатьиArticlesФаменский отрицательный экскурс изотопного состава углерода в разрезе на р. Изъяю (поднятие Чернышева, Предуральский краевой прогиб)Famennian negative carbon isotope excursion in the Izyayu River section (Tchernyshev Uplift, Cis-Uralian Foredeep)ГруздевД. А.GruzdevD. A.

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ул. Первомайская, 54

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Denis A. Gruzdev

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54 Pervomaiskaya st.

Syktyvkar

dag79@yandex.ruЖуравлевА. В.ZhuravlevA. V.

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ул. Первомайская, 54

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Andrey V. Zhuravlev

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54 Pervomaiskaya st.

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ВевельЯ. А.VevelYa. A.

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ул. Первомайская, 54

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Yadviga A. Vevel

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54 Pervomaiskaya st.

Syktyvkar

ЕрофеевскийА. В.ErofeevskyA. V.

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ул. Первомайская, 54

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Andrey V. Erofeevsky

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54 Pervomaiskaya st.

Syktyvkar

СмолеваИ. В.SmolevaI. V.

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ул. Первомайская, 54

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Irina V. Smoleva

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54 Pervomaiskaya st.

Syktyvkar

Институт геологии ФИЦ Коми НЦ УрО РАНРоссияInstitute of Geology FRC Komi SC UB RASRussian Federation202327042023232165178Copyright © Груздев Д.А., Журавлев А.В., Вевель Я.А., Ерофеевский А.В., Смолева И.В., 20232023Груздев Д.А., Журавлев А.В., Вевель Я.А., Ерофеевский А.В., Смолева И.В.Gruzdev D.A., Zhuravlev A.V., Vevel Y.A., Erofeevsky A.V., Smoleva I.V.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/1842   Объект исследования

   Объект исследования. В статье рассматриваются проявления раннесреднефаменского отрицательного экскурса в изотопном соотношении углерода в разрезе на р. Изъяю (юг поднятия Чернышева). 

   Цель исследования состоит в реконструкции возможных причин этого экскурса.

   Материалы и методы

   Материалы и методы. Материалом для работы послужили результаты изучения разреза глубоководно-шельфового нижнего-среднего фамена на р. Изъяю. Из разреза получены данные по изотопному составу углерода карбонатов и конодонтовых элементов (32 и 9 образцов соответственно).   Результаты. В интервале конодонтовых зон Pal. gracilis gracilis–Pal. marginifera marginifera установлено облегчение изотопного состава углерода карбонатов на 2.5 %, а изотопного состава углерода конодонтовых элементов – на 4 %. Разница изотопного состава углерода карбонатов и конодонтовых элементов повышается в этом интервалеболее чем на 2.5 %.

   Выводы

   Выводы. Стратиграфический объем отрицательной изотопной аномалии в разрезах на р. Изъяю охватывает интервал от конодонтовой зоны Pal. gracilis gracilis до зоны Pal. marginifera marginifera. Аномалия сопоставляется с глобальным понижением значений δ13Ccarb в конце раннего–начале среднего фамена. Возможными причинами наблюдаемых вариаций могли быть интенсификация вулканической и гидротермальной деятельности в различных регионах восточной Лавруссии, усиление терригенного стока из-за регрессии, относительно высокое содержание углекислоты в атмосфере и, возможно, локальное снижение первичной биопродуктивности.

   Research subject

   Research subject. The article is focused on manifestations of the Early-Middle Famennian negative excursion in carbon isotope composition in the Izyayu River section (south of the Tchernyshev Uplift).

   Aim

   Aim. The study is aimed to reconstructing of the probable causes of this isotope excursion.

   Materials and methods

   Materials and methods. The article is based on the results of study of the deep-shelf lower-middle Famennian sequence of the Izyayu River section. The carbon isotopic composition was studied for the carbonate samples and conodont elements (32 and 9 samples respectively).

   Results

   Results. The lightening of the carbon isotopic composition of carbonates by 2.5 %, and of the carbon isotopic composition of conodont elements by 4 % were found in the Pal. gracilis gracilis–Pal. marginifera marginifera zonal interval. The difference between the carbon isotopic compositions of carbonates and conodont elements increases in this interval by more than 2.5 %. Possible reasons for the observed variations could be the intensification of terrigenous runoff due to regression, a relatively high content of carbon dioxide in the atmosphere, and, possibly, a local decline in primary bioproductivity.

   Conclusions

   Conclusions. The negative carbon isotope shift spans Pal. gracilis gracilis–Pal. marginifera marginifera zonal interval in the Izyayu River section. The shift corresponds to the global decreasing in the δ13Ccarb values in the early/middle Famennian boundary interval. The increase in supply of the isotopically light carbon with terrigenous runoff and decrease in the primary bioproductivity are considered as probable causes of the carbon isotope excursion.

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