gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2024-15-6-0795SEMPDYgtcrust-1942Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSU-Pb ВОЗРАСТ И ГЕОХИМИЧЕСКАЯ ТИПИЗАЦИЯ ПОРОД САРАМСКОГО МАССИВА (ЗАПАДНОЕ ЗАБАЙКАЛЬЕ): К ПРОБЛЕМЕ РАННЕЮРСКОГО ГРАНИТОИДНОГО МАГМАТИЗМАU-Pb AGE AND GEOCHEMICAL TYPIFICATION OF THE SARAM MASSIF ROCKS (WESTERN TRANSBAIKALIA): EARLY JURASSIC GRANITOID MAGMATISMЕлбаевА. Л.ElbaevA. L.

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

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

ГордиенкоИ. В.GordienkoI. V.

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

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

КармановН. С.KarmanovN. S.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ЖалсараевБ. Ж.ZhalsaraevB. Zh.

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 геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian Federation202413122024156795795Copyright © Елбаев А.Л., Гордиенко И.В., Хубанов В.Б., Карманов Н.С., Жалсараев Б.Ж., 20242024Елбаев А.Л., Гордиенко И.В., Хубанов В.Б., Карманов Н.С., Жалсараев Б.Ж.Elbaev A.L., Gordienko I.V., Khubanov V.B., Karmanov N.S., Zhalsaraev B.Z.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/1942

Приведены данные о геологической позиции, возрасте, особенностях вещественного состава гранитоидов Сарамского массива, расположенного в северо-западной части Малханского хребта Западного Забайкалья. В строении массива участвуют породы двух фаз, отвечающие семействам сиенитов, умеренно щелочных гранитов (ранняя фаза) и лейкогранитов (поздняя фаза). Содержание кремнезема (мас. %) в гранитоидах ранней фазы варьируется от 63.8 до 71.2, поздней фазы – от 73.2 до 77.1. Породы ранней и поздней фазы массива имеют повышенную железистость (Fe*=0.77–0.88 и 0.80–0.93). Высокий индекс MALI (8.75–9.97) и содержания SiO2 позволяют отнести породы ранней фазы к щелочному типу, а поздней – к щелочно-известковистому. По значению индекса насыщения алюминием породы ранней фазы (0.93–1.07) соответствуют умеренно и высокоглиноземистым породам, а поздней (1.09–1.13) – отвечают высокоглиноземистым образованиям. Гранитоиды по геохимическим и минералогическим характеристикам отличаются от типичных агпаитовых A-гранитов и соответствуют особой группе глиноземистых пород A-типа. Датирование магматических цирконов двух фаз позволило определить раннеюрский U-Pb возраст (175–177 млн лет). Формирование гранитоидов Сарамского массива по времени практически синхронно с интенсивным орогенезом в Забайкалье, вероятной причиной которого является закрытие Монголо-Охотского океана.

The paper presents data on the geological position, age and features of the material composition of the Saram massif granitoids, located in the northwestern part of the Malkhan ridge of Western Transbaikalia. The structure of the massif involves two-phase rocks corresponding to syenite, early-phase moderate-alkali granite and late-phase leucogranite families. The silica content (wt. %) varies from 63.8 to 71.2 in the early-phase granitoids and from 73.2 to 77.1 in the late phases. The early-to-late-phase rocks of the massif are mostly ferruginous (Fe*=0.77–0.88 and 0.80–0.93, respectively). Based on a high modified alkaline lime index (MALI) (8.75–9.97) and relatively low SiO2 contents, the early-phase rocks can be referred to as alkaline rocks, and the late-phase rocks – as calc-alkaline rocks. According to the aluminum saturation index, the early-phase rocks (0.93–1.07) correspond to moderate-to-high-alumina rocks, and the late-phase rocks (1.09–1.13) – to high-alumina formations. Granitoids are geochemically and mineralogically different from typical agpaitic A-type granites and correspond to a special group of aluminous A-type rocks. The two phase magmatic zircon U-Pb dating yielded the 175–177 Ma age (Early Jurassic). The formation of granitoids in the Saram massif is temporally synchronous with intensive orogenesis in Transbaikalia, probably caused by the closure of the Mongol-Okhotsk Ocean.

 

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