gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2023-14-1-0686gtcrust-1630Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSСОСТАВ, ВОЗРАСТ И ГЕОДИНАМИЧЕСКАЯ ПОЗИЦИЯ ЩЕЛОЧНЫХ ПОРОД БОРГОЙСКОГО И БОЦИНСКОГО МАССИВОВ (ДЖИДИНСКАЯ ЩЕЛОЧНАЯ ПРОВИНЦИЯ)COMPOSITION, AGE AND GEODYNAMIC POSITION OF ALKALINE ROCKS IN THE BORGOY AND BOTSY MASSIFS (DZHIDA ALKALINE PROVINCE)ИзбродинИ. А.IzbrodinI. A.

630090, Новосибирск, пр-т Академика Коптюга, 3,

630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090,

1 Pirogov St, Novosibirsk 630090

izbrodin@igm.nsc.ruДорошкевичА. Г.DoroshkevichA. G.

630090, Новосибирск, пр-т Академика Коптюга, 3,

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

 

3 Academician Koptyug Ave, Novosibirsk 630090,

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

ХубановВ. Б.KhubanovV. B.

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

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

ХромоваЕ. А.KhromovaE. A.

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

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

Институт геологии и минералогии им. В.С. Соболева СО РАН; Новосибирский государственный университетРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State UniversityRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАН; Геологический институт им. Н.Л. Добрецова СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Dobretsov Geological Institute, 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 Federation202318022023141686686Copyright © Избродин И.А., Дорошкевич А.Г., Хубанов В.Б., Хромова Е.А., 20232023Избродин И.А., Дорошкевич А.Г., Хубанов В.Б., Хромова Е.А.Izbrodin I.A., Doroshkevich A.G., Khubanov V.B., Khromova E.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/1630

Боргойский и Боцинский массивы входят в состав Джидинской щелочной провинции Западного Забайкалья. Установлено, что породы Боргойского массива были сформированы в интервале 246–243 млн лет и совпадают с пермско-триасовым этапом формирования щелочных магматических пород, распространенных в Витимской провинции. Полученный возраст по цирконам Боцинского массива (121±1.0 млн лет) характеризует заключительный этап преобразования пород, связанный с рифтогенезом и излиянием щелочных базальтов. Наличие отрицательной Nb-Ta-аномалии и относительное обогащение Rb, Ba, Sr и U свидетельствуют о вероятном взаимодействии вещества плюма с ранее сформированными аккреционными комплексами зон субдукции.

The Borgoy and Botsy massifs are a part of the Dzhida alkaline province of the Western Transbaikalia. It has been stated that the rocks of the Borgoy massif were formed during the period from 246 to 243 Ma, which coincides with the formation period of the Permian-Triassic alkaline magmatic rocks common in the Vitim province. The age obtained from the zircons in the Botsy massif (121±1.0 Ma) is typical of the final stage of the transformation of the rocks related to rifting and alkali basalt lava flow. The presence of negative Nb-Ta anomaly and a relative enrichment in Rb, Ba, Sr and U imply interaction between the material of the plume and the earlier accretionary complexes of the subduction zones.

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