gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2023-14-3-0698gtcrust-1693Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSС- И Sr-ИЗОТОПНАЯ ХЕМОСТРАТИГРАФИЯ ПЕРЕХОДНЫХ ОТЛОЖЕНИЙ ВЕРХНЕГО ПРОТЕРОЗОЯ – НИЖНЕГО КЕМБРИЯ ЛЕНО-АНАБАРСКОГО ПРОГИБА (СЕВЕРО-ВОСТОК СИБИРСКОЙ ПЛАТФОРМЫ)C- AND Sr-ISOTOPE CHEMOSTRATIGRAPHY OF THE UPPER PROTEROZOIC – LOWER CAMBRIAN TRANSITIONAL DEPOSITS IN THE LENA-ANABAR TROUGH (NORTHEASTERN SIBERIAN PLATFORM)КочневБ. Б.KochnevB. B.

630090, Новосибирск, пр-т Академика Коптюга, 3; 630090, Новосибирск, ул. Пирогова, 1; 119017, Москва, Пыжевский пер., 7, стр. 1

Boris B. Kochnev.

3 Academician Koptyug Ave, Novosibirsk 630090; 1 Pirogov St, Novosibirsk 630090; 7-1 Pyzhevsky Ln, Moscow 119017

kochnevbb@ipgg.sbras.ruПокровскийБ. Г.PokrovskyB. G.

119017, Москва, Пыжевский пер., 7, стр. 1

7-1 Pyzhevsky Ln, Moscow 119017

КузнецовА. Б.KuznetsovA. B.

199034, Санкт-Петербург, наб. Макарова, 2

2 Makarova Emb, Saint Petersburg, 199034

Институт нефтегазовой геологии и геофизики им. А.А. Трофимука, СО РАН; Новосибирский государственный университет; Геологический институт, РАНРоссияTrofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University; Geological Institute, Russian Academy of SciencesRussian FederationГеологический институт, РАНРоссияGeological Institute, Russian Academy of SciencesRussian FederationИнститут геологии и геохронологии докембрия, РАНРоссияInstitute of Precambrian Geology and Geochronology, Russian Academy of SciencesRussian Federation202318062023143698698Copyright © Кочнев Б.Б., Покровский Б.Г., Кузнецов А.Б., 20232023Кочнев Б.Б., Покровский Б.Г., Кузнецов А.Б.Kochnev B.B., Pokrovsky B.G., Kuznetsov A.B.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/1693

Изучен изотопный состав углерода и стронция в карбонатных осадочных породах хорбусуонской серии и кессюсинской свиты, относимых к верхнему венду, в разрезе глубоких скважин Хастахская-930 и Бурская-341-0 Лено-Анабарского прогиба северо-восточной окраины Сибирской платформы. Максимальные значения δ13С в карбонатных породах туркутской и кессюсинской свит в скважине Хастахская-930 составляют до +7.0...+7.4 %о, а минимальные соотношения 87Sr/86Sr равны 0.7079. Такие изотопно-геохимические характеристики отложений позволяют предполагать более молодой, чем принято ранее (томмотский), либо более древний (ранневендский) возраст этих свит, что допускает альтернативные варианты их региональной корреляции с разрезами Бурской скв. 341-0 и Оленекского поднятия. Более интенсивное осадконакопление для отложений рассматриваемого возраста в сравнении со смежными регионами может указывать на обстановки растяжения, связанные с процессами рифтогенеза.

Studies have been made of the carbon and strontium isotope composition in carbonate sediments of the Khorbusuonka group and Kessyusa formation corresponding to the Upper Vendian in deep Khastakhskaya-930 and Burskaya-341-0 boreholes at the northeastern margin of the Siberian Platform. The maximum δ13С values in carbonates of the Turkut and Kessyusa formations in the Khastakhskaya-930 borehole are +7.0...+7.4 %, while the minimum 87Sr/86Sr ratios are as low as 0.7079. Such isotope-geochemical characteristics suggest that these formations are younger (Tommotian) or older (early Vendian) than it was supposed and allow for the possibility of alternatives to their regional correlation with the Burskaya-341-0 borehole and Olenek uplift sections. The deposition of sediments of the age considered, more intensive than in the adjacent regions, may be indicative of rift-related extension settings.

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