gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2023-14-3-0700gtcrust-1695Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSВОЗРАСТНЫЕ ОГРАНИЧЕНИЯ И ИСТОЧНИКИ СНОСА ДЛЯ ПОГРАНИЧНЫХ ОТЛОЖЕНИЙ ДОКЕМБРИЯ – КЕМБРИЯ ЮГА ЕНИСЕЙСКОГО КРЯЖА (РЕДКОЛЕСНАЯ И ОСТРОВНАЯ СВИТЫ)AGE CONSTRAINTS AND SOURCE AREAS FOR THE PRECAMBRIAN TO CAMBRIAN STRATA OF THE SOUTHERN YENISEI RIDGE (REDKOLESNAYA AND OSTROVNOY FORMATIONS)МарусинВ. В.MarusinV. V.

630090, Новосибирск, пр-т Академика Коптюга, 3; 630090, Новосибирск, ул. Пирогова, 2

Vasiliy V. Marusin.

3 Academician Koptyug Ave, Novosibirsk 630090; 2 Pirogov St, Novosibirsk 630090

marusinvv@ipgg.sbras.ruКочневБ. Б.KochnevB. B.

630090, Новосибирск, пр-т Академика Коптюга, 3; 630090, Новосибирск, ул. Пирогова, 2

3 Academician Koptyug Ave, Novosibirsk 630090; 2 Pirogov St, Novosibirsk 630090

КарловаГ. А.KarlovaG. A.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ПрошенкинА. И.ProshenkinA. I.

630090, Новосибирск, ул. Пирогова, 2; 630090, Новосибирск, пр-т Академика Коптюга, 3

2 Pirogov St, Novosibirsk 630090; 3 Academician Koptyug Ave, Novosibirsk 630090

Институт нефтегазовой геологии и геофизики им. А.А. Трофимука, СО РАН; Новосибирский государственный университетРоссияTrofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State UniversityRussian FederationИнститут нефтегазовой геологии и геофизики им. А.А. Трофимука, СО РАНРоссияTrofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of SciencesRussian FederationНовосибирский государственный университет; Институт геологии и минералогии им. В.С. Соболева, СО РАНРоссияNovosibirsk State University; Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian Federation202318062023143700700Copyright © Марусин В.В., Кочнев Б.Б., Карлова Г.А., Прошенкин А.И., 20232023Марусин В.В., Кочнев Б.Б., Карлова Г.А., Прошенкин А.И.Marusin V.V., Kochnev B.B., Karlova G.A., Proshenkin A.I.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/1695

Переходные отложения докембрия - кембрия на юго-западной окраине Сибирской платформы повсеместно характеризуются постепенной сменой красноцветных аллювиальных и дельтовых отложений на мелководно-морские карбонаты, что отражает заполнение аккомодационного пространства форландового бассейна в ходе трансгрессии. Однако предполагаемая синхронность морской трансгрессии в раннем кембрии требует верификации геохронологическими, био- и хемостратиграфическими данными. Результаты изучения мелких скелетных остатков, ископаемых следов жизнедеятельности и вариаций изотопного состава углерода в карбонатах в терригенно-карбонатной осадочной последовательности (редколесная и островная свиты) на юге Енисейского кряжа указывают на то, что основание фортунского яруса кембрия находится внутри редколесной свиты. Анализ возраста обломочных цирконов указывает на снос обломочного материала в форландовый бассейн при формировании редколесной свиты главным образом со стороны Сибирского кратона. Увеличение же роли внекратонных источников, расположенных по юго-западной периферии палеоконтинента в это время, в синхронных осадочных последовательностях в северных районах юга Енисейского кряжа говорит о сложной морфологии палеобассейна и существенной дифференциации источников сноса в его пределах.

The Precambrian to Cambrian strata at the southwestern margin of the Siberian Platform are ubiquitously characterized by a gradual transition from red-colored alluvial and deltaic deposits to shallow-marine carbonates, reflecting a transgressive infill of the accommodation space of the foreland basin. However, a supposed synchronicity of the Early Precambrian marine transgressive events calls for verification by geochronological and bio- and chemostratigraphic dating. The herein-presented data on small skeletal fossils, trace fossils and variations in the carbon isotope composition of carbonates from the mixed carbonate-terrigenous succession (Redkolesnaya and Ostrovnoy formations) in the southern Yenisei ridge show that the base of the Cambrian Fortunian stage is placed within the Redkolesnaya formation. Age distribution of detrital zircons in the studied succession suggests the Siberian craton to be a major source of the clastic material in the foreland basin during the development of the Redkolesnaya formation. An increase in the amount of zircons derived from "non-Siberian" sources, located at the southwestern periphery of the paleocontinent at that time, in the coeval strata of the northern part of the southern Yenisei ridge, indicates a complex morphology of the paleobasin and considerable differentiation among the sources of clastic material therein.

хемостратиграфиямелкие скелетные остаткиископаемые следы жизнедеятельностиU-Pb геохронологияобломочный цирконСибирская платформадокембрийкембрийЕнисейский кряжchemostratigraphysmall skeletal fossilstrace fossilsU-Pb geochronologydetrital zirconSiberian PlatformPrecambrianCambrianYenisei ridgeИсследование проведено при финансовой поддержке Российского научного фонда (проект 21-17-00052 - аналитические исследования, 22-77-00026 - изучение ископаемых следов жизнедеятельности). Тематика исследования скоординирована с Программой фундаментальных научных исследований РАН FWZZ-2022-0002. Авторы выражают благодарность Ж.А. Сарсембаеву (ИНГГ СО РАН, г. Новосибирск) за помощь в фотографировании мелких скелетных остатков на сканирующем электронном микроскопе. Авторский коллектив искренне признателен рецензентам Б.Г. Покровскому и С.В. Рудько (ГИН РАН, г. 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The authors declare that there are no conflicts of interest present.