gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2026-17-2-0883ICJHPQgtcrust-2242Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSСЕВЕРО-БИЧУРСКАЯ ГАББРО-ГРАНИТНАЯ АССОЦИАЦИЯ ЗАПАДНОГО ЗАБАЙКАЛЬЯ: СОСТАВ, ВОЗРАСТ, ВОПРОСЫ КОРРЕЛЯЦИИ И ГЕОДИНАМИЧЕСКИЕ АСПЕКТЫNORTH BICHURA GABBRO-GRANITE ASSOCIATION OF WESTERN TRANSBAIKALIA: COMPOSITION, AGE, CORRELATION ISSUES AND GEODYNAMIC ASPECTShttps://orcid.org/0000-0002-6701-2570ЕлбаевА. Л.ElbaevA. L.

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

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

elbaev@ginst.ruhttps://orcid.org/0000-0002-2890-1105ГордиенкоИ. В.GordienkoI. V.

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

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

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

123242, Москва, ул. Большая Грузинская, 10, стр. 1

10-1 Bolshaya Gruzinskaya St, Moscow 123242 

https://orcid.org/0000-0002-4614-0610СкрипниковМ. С.SkripnikovM. S.

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

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

Геологический институт им. Н.Л. Добрецова СО РАНРоссияDobretsov Geological Institute, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут физики Земли им. О.Ю. Шмидта РАНРоссияSchmidt Institute of Physics of the Earth, Russian Academy of SciencesRussian Federation202617042026172883883Copyright © Елбаев А.Л., Гордиенко И.В., Хубанов В.Б., Скрипников М.С., 20262026Елбаев А.Л., Гордиенко И.В., Хубанов В.Б., Скрипников М.С.Elbaev A.L., Gordienko I.V., Khubanov V.B., Skripnikov M.S.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/2242

Приведены новые данные о возрасте и особенностях распределения основных породообразующих компонентов и микроэлементов в породах Северо-Бичурской габбро-гранитной ассоциации, являющейся петротипом бичурского интрузивного комплекса. По химическому составу исследованные породы отвечают семействам габбро, монцогаббро, монцодиоритов, монцонитов, граносиенитов, умеренно щелочных гранитов и лейкогранитов. Геологическое строение и состав пород этой ассоциации дают важное представление о раннемезозойских тектономагматических процессах в южной части Западного Забайкалья в период закрытия Монголо-Охотского палеоокеана. U-Pb геохронология циркона, полученная методом LA-ICP-MS, позволяет выделить два этапа магматической активности: 247–245 и 228–226 млн лет назад, что соответствует средне- и позднетриасовому периодам. На раннем этапе происходило становление пород габбро-монцонитового состава, а на позднем – гранитоидного. Установленный временной разрыв более 20 млн лет между габброидами и гранитоидами Северо-Бичурского плутона противоречит модели формирования пород при дифференциации исходного базитового расплава. Выделено два петрографических типа габброидов – амфибол-пироксеновый и пироксенбиотитовый, они имеют различные геохимические характеристики. Первый тип сопоставим с породами, формирующимися в условиях внутриплитных обстановок, в то время как второй аналогичен магматическим образованиям, возникающим в зонах субдукции. Формирование базитовых расплавов с разными геохимическими параметрами в среднем триасе, скорее всего, указывает на их происхождение из двух различных источников: надсубдукционной литосферной мантии и астеносферной мантии. Анализ геохимических и геохронологических данных свидетельствует о явлениях конвергенции на раннемезозойском тектономагматическом этапе, обусловленных закрытием Монголо-Охотского палеоокеана.

This paper presents new data on the age and distribution features of the main rock-forming components and trace elements in the rocks of the North Bichura gabbro-granite association, which is a petrotype of the Bichura intrusive complex. The chemical composition of the rocks studied corresponds to the gabbro, monzogabbro, monzodiorite, monzonite, granosyenite, moderately alkaline granite and leucogranite families. The geological structure and composition of the North Bichura rocks provide important insights into the Early Mesozoic tectonomagmatic processes in the southern part of Western Transbaikalia during the closure of the Mongol-Okhotsk paleoocean. LA-ICP-MS U-Pb zircon geochronology allows us to distinguish two stages of magmatic activity: 247–245 and 228–226 Ma ago, corresponding to the Middle and Late Triassic periods. The early stage was characterized by the formation of gabbro-monzonite rocks, and the late stage – by the formation of granitoid rocks. More than 20 million-year gap between the gabbroids and granitoids of the North Bichura pluton contradicts the model of rock formation based on differentiation of the initial basic melt. Two petrographic types of gabbroids have been distinguished that show different geochemical characteristics – amphibole-pyroxene and pyroxene-biotite. The first type is comparable to rocks formed in intraplate settings, while the second is similar to subduction zone magmatism. The formation of the Middle Triassic basic melts with different geochemical parameters most likely indicates their origin from two different sources: suprasubduction lithospheric mantle and asthenospheric mantle. Analysis of geochemical and geochronological data indicates the Early Mesozoic tectonomagmatic-related convergence caused by the closure of the Mongol-Okhotsk paleoocean.

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