gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2023-14-2-0695gtcrust-1666Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSПОЛОЖЕНИЕ АНАЙСКОЙ СВИТЫ В РАЗРЕЗЕ ПРОТЕРОЗОЯ БАЙКАЛЬСКОГО ВЫСТУПА ФУНДАМЕНТА СИБИРСКОЙ ПЛАТФОРМЫPOSITION OF THE ANAI FORMATION IN THE PROTEROZOIC SECTION OF THE BAIKAL SALIENT OF THE SIBERIAN PLATFORM BASEMENThttps://orcid.org/0000-0002-9211-9812ЕфремоваУ. С.EfremovaU. S.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

https://orcid.org/0000-0003-1141-0518ДонскаяТ. В.DonskayaT. V.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

https://orcid.org/0000-0003-1621-0865МазукабзовА. М.MazukabzovA. M.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

https://orcid.org/0000-0001-7227-8253ГладкочубД. П.GladkochubD. P.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

https://orcid.org/0000-0001-5237-6614ХубановВ. Б.KhubanovV. B.

670047, Улан-Удэ, ул. Сахьяновой, 6а, Республика Бурятия

6а Sakhyanova St, Ulan-Ude 670047, Republic of Buryatia

Институт земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesRussian FederationГеологический институт им. Н. Л. Добрецова СО РАНРоссияDobretsov Geological Institute, Siberian Branch of the Russian Academy of SciencesRussian Federation202319042023142695695Copyright © Ефремова У.С., Донская Т.В., Мазукабзов А.М., Гладкочуб Д.П., Хубанов В.Б., 20232023Ефремова У.С., Донская Т.В., Мазукабзов А.М., Гладкочуб Д.П., Хубанов В.Б.Efremova U.S., Donskaya T.V., Mazukabzov A.M., Gladkochub D.P., Khubanov V.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/1666

В статье представлены первые результаты U-Pb (LA-ICP-MS) датирования детритовых цирконов из кварц-серицит-хлоритового сланца анайской свиты, располагающейся в пределах Байкальского выступа фундамента Сибирской платформы. Проведенные исследования показали, что основной пик возраста детритовых цирконов фиксируется на отметке 1.86 млрд лет, что свидетельствует о том, что породы анайской свиты накапливались после формирования магматических пород Южно-Сибирского постколлизионного магматического пояса, возраст которых составляет 1.88‒1.84 млрд лет. Данный факт позволяет пересмотреть точку зрения о принадлежности анайской свиты к разрезу палеопротерозойской сарминской серии, породы которой интрудированы гранитоидами Южно-Сибирского магматического пояса. Показано, что породы анайской свиты могут рассматриваться в качестве возрастных и фациальных аналогов протерозойских отложений пурпольской свиты Патомской зоны Саяно-Байкало-Патомского пояса. Принимая во внимание прорывание отложений анайской свиты силлами и дайками неопротерозойских (~720 млн лет) долеритов, можно сделать вывод о том, что накопление пород этой свиты имело место, предположительно, в ранненеопротерозойское время.

The paper presents the first U-Pb (LA-ICP-MS) dating results for detrital zircons from the quartzsericite-chlorite schist of the Anai formation within the Baikal salient of the Siberian platform basement. During the study the detrital zircons showed a major age peak at 1.86 Ga, which indicates that the rocks of the Anai formation were accumulated after the development of magmatic rocks of the South Siberian post-collisional magmatic belt with an age of 1.88‒1.84 Ga. This fact makes it possible to reconsider a point of view on the belonging of the Anai formation to the section of the Paleoproterozoic Sarma group whose rocks were intruded by granitoids of the South Siberian magmatic belt. It is shown that the rocks of the Anai formation can be considered as age and facial equivalents of the Proterozoic sediments of the Purpol formation of the Patom zone. Taking into account the Anai formation sediments intruded by sills and dikes of the Neoproterozoic (~720 Ma) dolerites, it can be concluded that the rocks of this formation were presumably accumulated in the Early Neoproterozoic time.

детритовые цирконыанайская свитасарминская серияпротерозойЗападное Прибайкальеdetrital zirconsAnai formationSarma groupProterozoicWestern TransbaikaliaГеохимические и геохронологические исследования выполнены при поддержке Российского научного фонда (грант No 18-17-00101), геологические исследования – при поддержке гранта Правительства Российской Федерации No 075-15-2022-1100. При выполнении аналитических исследований было использовано оборудование и инфраструктура ЦКП «Геодинамика и геохронология» Института земной коры СО РАН, развитие которого осуществляется в рамках гранта Минобрнауки России No 075-15-2021-682.The geochemical and geochronological studies were supported by the Russian Science Foundation (grant 18-17-00101), the geological studies – by the Russian Government grant 075-15-2022-1100. 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The authors declare that there are no conflicts of interest present.