gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2025-16-1-0806kqxxbegtcrust-1982Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSВОЗРАСТ И ГЕОДИНАМИЧЕСКИЙ РЕЖИМ ФОРМИРОВАНИЯ МЕЛОВЫХ МАГМАТИЧЕСКИХ ПОРОД ЗАПАДНОЙ ГРАНИЦЫ БАДЖАЛЬСКОГО ТЕРРЕЙНА (СИХОТЭ-АЛИНСКИЙ ОРОГЕННЫЙ ПОЯС)AGE AND GEODYNAMIC SETTINGS OF THE FORMATION OF CRETACEOUS IGNEOUS ROCKS ALONG THE WESTERN BOUNDARY OF THE BADZHAL TERRANE (SIKHOTE-ALIN OROGENIC BELT)АлександровИ. А.AlexandrovI. A.

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ЛебедевА. Ю.LevedevA. Yu.

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ИвинВ. B.IvinV. V.

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СеменякБ. И.SemenyakB. I.

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РаткинВ. В.RatkinV. V.

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БудницкийС. Ю.BudnitskiyS. Yu.

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159 100-letya Ave, Vladivostok 690022

Дальневосточный геологический институт ДВО РАНРоссияFar East Geological Institute, Far East Branch of the Russian Academy of SciencesRussian Federation202519022025161806806Copyright © Александров И.А., Лебедев А.Ю., Ивин В.B., Семеняк Б.И., Раткин В.В., Будницкий С.Ю., 20252025Александров И.А., Лебедев А.Ю., Ивин В.B., Семеняк Б.И., Раткин В.В., Будницкий С.Ю.Alexandrov I.A., Levedev A.Y., Ivin V.V., Semenyak B.I., Ratkin V.V., Budnitskiy S.Y.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/1982

Представлены результаты исследований геохимии и U-Pb датирования по циркону меловых магматических пород самой западной части Баджальского террейна в пределах Баджальской и Дуссе-Алинской вулканических зон Хингано-Охотского магматического ареала. Для гранитов Верхнеурмийского массива и Правоурмийской дайки в Баджальской зоне получен возраст 100±1 и 93±1 млн лет соответственно. Возраст диоритов междуречья Сулук – Эгоно Дуссе-Алинской зоны определен равным 88±1 млн лет, а для трех популяций циркона из литокластического туфа – 88±2, 97±1 и 105.5±1.3 млн лет. Результаты датирования свидетельствуют о том, что образование синорогенных восстановленных гранитов Верхнеурмийского рудного узла происходило в режиме трансформной континентальной окраины, сформировавшем крупную альб-сеноманскую магматическую провинцию Тихоокеанской Азии. Диориты магнетитовой серии Дуссе-Алинской зоны были образованы в течение последующего турон-маастрихского этапа, связываемого с субдукцией, однако их геохимические характеристики не типичны для надсубдукционных магм. Это может свидетельствовать о более позднем переходе к субдукции на данном участке континентальной окраины или о существовании локальных условий растяжения и/или сдвиговых смещений в обстановке субдукции. Изученные магматические породы обоих этапов и вулканических зон сформировались при значимом участии материала зрелой континентальной коры и характеризуются близким диапазоном значений εNd(t) от –0.9 до –2.6 и двустадийного Nd модельного возраста от 1.22 до 1.05 млрд лет.

The paper presents the results of the study of geochemistry and U-Pb zircon dating of Cretaceous igneous rocks of the westernmost part of the Badzhal terrane within the Badzhal and Dusse-Alin volcanic zones of the Khingan-Okhotsk magmatic belt. The granites of the Verkhneurmysky pluton and Pravourmyskaya dyke in the Badzhal zone were dated at 100±1 and 93±1 Ma, respectively. The age of diorite in the Suluk-Egono interfluve of the Dusse-Alin zone was estimated at 88±1 Ma, and the ages of three tuff zircon populations were estimated at 88±2, 97±1 and 105.5±1.3 Ma. The dating results indicate that the synorogenic reduced granites of the Verkhneurmysky ore cluster were formed under the transform continental margin regime, which gave rise to the occurrence of a large Albian-Cenomanian magmatic province of Pacific Asia. The magnetite series diorites of the Dusse-Alin zone were formed during the subsequent subduction-related Turonian-Maastrichian stage, but their geochemical characteristics are not typical of suprasubduction magmas. This may indicate a later transition to subduction at this section of the continental margin, or the existence of local extension and/or transcurrent faulting in the subduction settings. The studied igneous rocks of both stages and volcanic zones were formed with significant involvement of material from the mature continental crust, and are characterized by a similar range of εNd(t) values from –0.9 to –2.6 and two-stage Nd model ages from 1.22 to 1.05 Ga.

Баджальский террейнтрансформная континентальная окраинагранитоидыильменитовая сериямагнетитовая серияХингано-Охотский ареалСихотэ-Алинский орогенный поясBadzhal terranetransform continental margingranitoidsilmenite seriesmagnetite seriesKhingan-Okhotsk areaSikhote-Alin orogenic beltИсследования выполнены за счет средств Российского научного фонда в рамках гранта 22-17-00198, https://rscf.ru/project/22-17-00198/.The study was supported by grant 22-17-00198 from the Russian Science Foundation, https://rscf.ru/project/22-17-00198/.ReferencesAlekseev V.I., Marin Y.B., Kapitonov I.N., Sergeev S.A., 2013. Age and Material Sources of Lithium-Fluorine Granites of the Far East (U-Pb and Lu-Hf Isotope Data). Doklady Earth Sciences 449 (2), 444–446. https://doi.org/10.1134/S1028334X1304017X.Alekseev V.I., Marin Y.B., Kapitonov I.N., Sergeev S.A., 2013. Age and Material Sources of Lithium-Fluorine Granites of the Far East (U-Pb and Lu-Hf Isotope Data). 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The authors declare that there are no conflicts of interest present.