litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/2500-302X-2025-25-3-398-418DJVLTPlitosphere-2303Research ArticleСтатьиArticlesОсобенности распределения изотопного состава углерода в карбонатах разреза сартъюской свиты (нижний карбон, Воркутинское поднятие)Distribution features of carbon isotopes in carbonates on the example of the Sartiu Formation (Lower Carboniferous, Vorkuta Uplift)ЕрофеевскийА. В.ErofeevskyA. V.

167982, г. Сыктывкар, ул. Первомайская, 54

54 Pervomaiskaya st., Syktyvkar, 167982

averofeevsky@geo.komisc.ruПлотицынА. Н.PlotitsynA. N.

167982, г. Сыктывкар, ул. Первомайская, 54

54 Pervomaiskaya st., Syktyvkar, 167982

anplotitzyn@rambler.ruЖуравлевА. В.ZhuravlevA. V.

167982, г. Сыктывкар, ул. Первомайская, 54

54 Pervomaiskaya st., Syktyvkar, 167982

ВевельЯ. А.VevelYa. A.

167982, г. Сыктывкар, ул. Первомайская, 54

54 Pervomaiskaya st., Syktyvkar, 167982

ИвановаР. М.IvanovaR. M.

620110, г. Екатеринбург, ул. Академика Вонсовского, 15

15 Academician Vonsovsky st., Ekaterinburg, 620110

geoivanur@mail.ruИнститут геологии им. академика Н.П. Юшкина ФИЦ Коми НЦ УрО РАНРоссияN.P. Yushkin Institute of Geology, FRC Komi SC UB RASRussian FederationИнститут геологии и геохимии им. академика А.Н. Заварицкого УрО РАНРоссияA.N. Zavaritsky Institute of Geology and Geochemistry, UB RASRussian Federation202515072025253398418Copyright © Ерофеевский А.В., Плотицын А.Н., Журавлев А.В., Вевель Я.А., Иванова Р.М., 20252025Ерофеевский А.В., Плотицын А.Н., Журавлев А.В., Вевель Я.А., Иванова Р.М.Erofeevsky A.V., Plotitsyn A.N., Zhuravlev A.V., Vevel Y.A., Ivanova R.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/2303Объект исследования

Объект исследования. Изотопный состав углерода и кислорода карбонатов породы и раковин брахиопод в разрезе верхней части сартъюской свиты (нижний карбон, Воркутинское поднятие).

Цель

Цель. Сравнительная оценка сохранности материала и вариаций изотопного состава углерода и кислорода в раковинах брахиопод и вмещающей породе на примере в значительной степени вторично преобразованных отложений.

Материал и методы

Материал и методы. Стратиграфическую основу составили данные по фораминиферам, конодонтам и брахиоподам. Изотопный анализ углерода и кислорода карбонатов раковин брахиопод и вмещающей породы проведен для 76 образцов из 35 уровней в пределах верхней части серпуховского яруса. При оценке пригодности карбонатных компонентов для реконструкции исходного изотопного состава древней морской воды использованы данные о перекристаллизации карбонатов, содержание органического углерода, соотношение изотопного состава углерода и кислорода, катодолюминесценция, таксономическая принадлежность брахиопод.

Результаты

Результаты. Изучение изотопного состава углерода показало существенные различия изотопных составов раковин брахиопод и вмещающей породы. Нижняя часть разреза (около 4.3 м) характеризуется утяжелением изотопного состава углерода раковинного материала от 2 до 4.1‰. Выше по разрезу (следующие 2.5 м) происходит резкое увеличение значений δ13С до 7.3‰ (образец с Davidsonina carbonaria), затем снижение до 3.4‰ и, наконец, наблюдается разброс значений δ13С от 1.2 до 6‰ в прикровельной части. При этом изотопный состав углерода известняков довольно однороден по всему разрезу (δ13С от –0.2 до 2.6‰, среднее значение 1.0‰), демонстрируя в то же время незначительный негативный тренд в верхней части. Предполагается, что изотопный состав углерода изученных образцов известняков сильно изменен вторичными процессами. Карбонат раковин брахиопод, предположительно, обладает изотопным составом углерода, близким к равновесному с бикарбонатом морской воды палеобассейна. Однако у представителей рода Davidsonina отмечено значительное (на 4–6‰) утяжеление изотопного состава углерода относительно других таксонов. Средние значения δ18O известняков составляют 21.3‰ SMOW (отвечает –9.3‰ PDB), а раковин брахиопод – 22.2‰ (отвечает –8.4‰ PDB), что исключает первичную природу изотопного состава кислорода.

Выводы

Выводы. Изученный материал показал хорошую сохранность изотопного состава углерода в раковинах брахиопод даже в случае существенной перекристаллизации вмещающих карбонатов. Утяжеление изотопного состава углерода в раковинном материале представителей рода Davidsonina объясняется возможным “жизненным эффектом”, что затрудняет использование изотопных данных, полученных по раковинам этих брахиопод, для изотопной стратиграфии. В целях корректной изотопно-стратиграфической интерпретации вариаций изотопного состава углерода в разрезах необходимо изучение таксономически однородных выборок в рамках как минимум одного рода.

Research subject

Research subject. The carbon and oxygen isotope composition of rock carbonates and brachiopod shells in the section of the upper part of the Sartiu Formation (Mississippian, Vorkuta uplift).

Aim

Aim. Comparative evaluation of isotopic signal preservation in brachiopod shells and host rock on the example of strongly secondary altered sediments.

Methods

Methods. Data on foraminifera, conodonts, and brachiopods formed the stratigraphic framework. Carbon and oxygen isotope analyses of carbonates of brachiopod shells and host rock, accompanied by screening tests, were determined for 76 samples from 35 levels within the upper part of the Serpukhovian Stage. Data on carbonate recrystallisation, organic carbon content, carbon-oxygen isotope ratio, cathodoluminescence, and taxonomic affiliation of brachiopods were used for screening.

Results

Results. The data on carbon isotope composition showed significant differences in isotopic signals in brachiopod shells and in the host rock. The lower part of the section (approximately 4.3 m) is characterized by a heavying of the carbon isotopic composition of the shell material from 2.0 to 4.1‰. Higher up the section (next 2.5 m), a sharp increase in δ13C up to 7.3‰ is observed (sample with Davidsonina carbonaria) followed by a decrease to 3.4‰ and then a scatter of values from 1.2 to 6‰ in the uppermost part. At the same time, the carbon isotope composition of limestones shows rather stable values along the entire section (from –0.2 to 2.6‰, mean value 1.0‰), showing a slight negative trend towards the upper part. According to the screening tests, all limestone samples show a highly altered signal by secondary processes; however, brachiopod shell carbonate is assumed to have a near-primary isotopic composition. At the same time, the isotopic composition of brachiopod shells strongly depends on taxonomic affiliation. In representatives of the Davidsonina genus, a significant (by 4–6‰) heavying of the carbon isotopic composition was noted. The average δ18O values of limestones are 21.3‰ SMOW (corresponding to –9.3‰ PDB) and brachiopod shells 22.2‰ (corresponding to –8.4‰ PDB), which rules out the primary nature of oxygen isotopic composition.

Conclusions

Conclusions. The studied material showed good preservation of the isotopic signal in brachiopod shells even in the case of significant recrystallisation of the host carbonates. The significant vital effect characteristic of representatives of the Davidsonina genus makes it difficult to use isotopic data obtained from these brachiopod shells for the purposes of isotopic stratigraphy. For correct isotopestratigraphic interpretation of variations in carbon isotope composition in sections, taxonomically homogeneous samples within at least one genus should be studied.

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