gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2025-16-5-0845ervtopgtcrust-2104Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSКАЙНОЗОЙСКИЙ ГРАБЕН В ЗОНЕ КРАЕВОГО ШВА СИБИРСКОГО КРАТОНА: СПЕЦИФИКА ВНУТРЕННЕЙ СТРУКТУРЫ И РЕКОНСТРУКЦИИ ТЕКТОНИЧЕСКИХ НАПРЯЖЕНИЙTHE CENOZOIC GRABEN IN THE MARGINAL SUTURE ZONE OF THE SIBERIAN CRATON: INTERIOR STRUCTURAL FEATURES AND TECTONIC STRESS RECONSTRUCTIONSЧеремныхА. В.CheremnykhA. V.

664033, Иркутск, ул. Лермонтова, 128

Alexander V. Cheremnykh

128 Lermontov St, Irkutsk 664033

cherem@crust.irk.ruБобровА. А.BobrovA. A.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

ДекабрёвИ. К.DekabryovI. K.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

ЧеремныхА. С.CheremnykhA. S.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

ГридинГ. А.GridinG. A.

119334, Москва, Ленинский пр-т, 38/1

38-1 Leninsky Ave, Moscow 119334

ПавловД. В.PavlovD. V.

119334, Москва, Ленинский пр-т, 38/1

38-1 Leninsky Ave, Moscow 119334

ЮрьевА. А.YurievA. A.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

Институт земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут динамики геосфер РАНРоссияInstitute of Geospheres Dynamics, Russian Academy of SciencesRussian Federation202517102025165845845Copyright © Черемных А.В., Бобров А.А., Декабрёв И.К., Черемных А.С., Гридин Г.А., Павлов Д.В., Юрьев А.А., 20252025Черемных А.В., Бобров А.А., Декабрёв И.К., Черемных А.С., Гридин Г.А., Павлов Д.В., Юрьев А.А.Cheremnykh A.V., Bobrov A.A., Dekabryov I.K., Cheremnykh A.S., Gridin G.A., Pavlov D.V., Yuriev A.A.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/2104

Краевые швы древних платформ – зоны глубинных разломов, отделяющие кратон от подвижного пояса. Особый интерес представляет краевой шов прибайкальской окраины Сибирского кратона, который активизирован при кайнозойском рифтогенезе. Здесь наблюдается одна из наиболее молодых структур Байкальской рифтовой зоны – Бугульдейско-Чернорудский грабен. Грабен образован Приморским и Тырганским сбросами, продольными по отношению к краевому шву. В статье приводятся материалы исследования внутренней структуры грабена электротомографией и результаты реконструкции тектонических напряжений различными методами. Проведенное исследование показало, что разломно-блоковая структура грабена и его ближайших окрестностей сформировалась преимущественно в условиях северо-западного – юго-восточного регионального растяжения, характерного для позднекайнозойского времени развития Байкальского рифта. Локальные разрывы, удовлетворяющие другим региональным динамическим обстановкам, составляют не более 26 % от общего числа.

Marginal suture zones of ancient platforms are deep-seated fault zones separating the craton from the mobile belt. Of particular interest is the Pribaikalian marginal suture of the Siberian craton, activated during the Cenozoic rifting. There is one of the youngest structures of the Baikal rift zone – the Buguldeika-Chernorud graben. The graben is formed by the Primorsky and the Tyrgan normal faults, longitudinal relative to the marginal suture. The paper deals with the study of the graben interior structure by the electrical resistivity tomography method and presents the results of tectonic stress reconstruction by different methods. The study has shown that the fault-block structure of the graben and its immediate vicinities formed largely under the northwest to southeast regional extension conditions typical for the Late Cenozoic development of the Baikal rift. Local faults corresponding to other regional dynamic settings make up no more than 26 % of the total amount.

Байкальская рифтовая зонакраевой шовразломылинеаментыграбенэлектротомографиятектонические напряженияBaikal rift zonemarginal suturefaultslineamentsgrabenelectrical resistivity tomographytectonic stressesИсследование проведено при поддержке Минобрнауки РФ в рамках госзадания (темы: FWEF-2021-0009 и 125012700824-4) с использованием оборудования и инфраструктуры ЦКП «Геодинамика и геохронология» ИЗК СО РАН (грант № 075-15-2021-682).The study was supported by the Ministry of Science and Higher Education of the Russian Federation on state assignment (No. FWEF-2021-0009 and 125012700824-4) using the equipment and infrastructure of the Centre for Geodynamics and Geochronology at the Institute of the Earth’s Crust SB RAS (grant No. 075-15-2021-682).ReferencesAngelier J., 1990. Inversion of the Field Data in Fault Tectonics to Obtain the Regional Stress–III. A New Rapid Direct Inversion Method by Analytical Means. 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The authors declare that there are no conflicts of interest present.