gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2023-14-5-0716gtcrust-1741Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSГЕНЕЗИС ГРАНАТ-ПИРОКСЕНОВЫХ СИЕНИТОВ (СВЯТОНОСИТОВ) МАЛОБЫСТРИНСКОГО МАССИВА (СЛЮДЯНСКИЙ КОМПЛЕКС, ЮЖНОЕ ПРИБАЙКАЛЬЕ): РЕЗУЛЬТАТЫ ГЕОХИМИЧЕСКИХ И ИЗОТОПНЫХ ИССЛЕДОВАНИЙTHE GENESIS OF GARNET-PYROXENE SYENITES (SVIATONOSSITES) OF THE MALOBYSTRINSKY MASSIF (SLYUDYANKA COMPLEX, SOUTH BAIKAL REGION): RESULTS OF GEOCHEMICAL AND ISOTOPIC STUDIESДемонтероваЕ. И.DemonterovaE. I.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

dem@crust.irk.ruРезницкийЛ. З.ReznitskyL. Z.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

ИвановА. В.IvanovA. V.

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 Federation202317102023145716716Copyright © Демонтерова Е.И., Резницкий Л.З., Иванов А.В., 20232023Демонтерова Е.И., Резницкий Л.З., Иванов А.В.Demonterova E.I., Reznitsky L.Z., Ivanov A.V.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/1741

Исследованы сиениты и святоноситы (андрадитсодержащие сиениты) Малобыстринского массива слюдянского комплекса (Южное Прибайкалье, Сибирь), а также крупная дайка монцонитов, по возрасту и составу сходная с породами рассматриваемого массива. Исследованные породы относятся к ряду существенно железистых и метаглиноземистых с индексом ASI ниже 1. Породы характеризуются содержанием SiO2 49–65 мас. % и суммой щелочей K2O+Na2O до 12 мас. %, MgO ниже 4 мас. %, высокими содержаниями TiO2 – до 2.5 мас. %, Al2O3 – до 17 мас. %. СаО варьируется в широком интервале значений – от 2.2 до 14.7 мас. %. По микроэлементному спектру породы близки между собой и характеризуются общими трогами Th-U, Nb-Ta и Ti. На спектрах распределения редкоземельных элементов для всего комплекса пород наблюдается очень слабая отрицательная аномалия Eu. Полученный Sm-Nd возраст святоноситов Малобыстринского массива 487.1±6.1 млн лет (СКВО=0.99). Диапазон скорректированных на возраст значений εNd(t) в сиените и монцоните составляет –1.9…–2.8, при εSr(t) 21–30, а в святоноситах εNd(t) –3.8…–4.1 при близких εSr(t) – 26. Модельный возраст для всех рассматриваемых пород TNd(DM) имеет мезопротерозойские значения 1.3–1.4 млрд лет. Основываясь на химическом и Sr-Nd-изотопном составе исследованных магматических пород, можно предположить, что их образование связано с плавлением коровых амфиболитов. Кристаллизация андрадитового граната в сиенитовой магме вызвана контаминацией расплава вмещающими метаморфическими породами слюдянского комплекса.

This paper deals with the study of syenites and sviatonossites (andradite-bearing syenites) of the Malobystrinsky massif of the Slyudyanka complex (South Baikal region, Siberia), and a large monzonite dike similar in age and composition to the rocks of the massif considered. The studied rocks belong to a series of highly ferriferous and metaluminous A-type granitoids (ASI index <1). They are characterized by SiO2 45–65 wt. %, K2O+Na2O up to 12 wt. %, MgO <4 wt. %, TiO2 up to 2.5 wt. %, and Al2O3 up to 17 wt. %. CaO varies in a wide range, from 2.2 to 14.7 wt. %. The rocks are similar to each other in trace element composition and show patterns with troughs for Th-U, Nb-Ta and Ti. Low-amplitude negative Eu anomaly is observed in the distribution spectra of rare earth elements for the entire rock complex. The obtained Sm-Nd age of sviatonossites in the Malobystrinsky massif is 487.1±6.1 Ma (MSWD=0.99). Our results indicate that syenites and monzonites have εNd(t) –1.9…–2.8, at εSr(t) 21–30, and sviatonossites have εNd(t) –3.8…–4.1 at εSr(t) – 26. Model ages TNd(DM) for all rock types are Mesoproterozoic (1.3–1.4 Ga). Based on the chemical and Sr-Nd isotopic composition of the magmatic rocks studied, it can be assumed that they have been generated by partial melting of lower crustal rocks (amphibolites). Crystallization of andradite garnet in syenite magma can occur due to melt contamination with metamorphic host rocks of the Slyudyanka complex.

святоноситысиенитымонцонитыTi-содержащий андрадитовый гранатМалобыстринский массивслюдянский комплексизотопы Sr-NdSm-Nd возрастSviatonossitessyenitesmonzonitesTi-andradite garnetMalobystrinsky massifSlyudyanka complexSr-Nd isotopesSm-Nd ageРаботы выполнены с использованием оборудования и инфраструктуры ЦКП «Геодинамика и геохронология» ИЗК СО РАН по гранту 075­15­2021­682. Полевые работы проведены за счет средств мегагранта № 075­15­2022­1100. Авторы выражают благодарность С.В. Пантеевой за выполнение аналитических исследований и И.Г. Барашу – за помощь при оформлении данной статьи.The work was conducted using 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). Fieldwork was carried out with the support of megagrant 075-15-2022-1100.ReferencesBarbarin B., 1999. A Review of the Relationships between Granitoid Types, Their Origins and Their Geodynamic Environments. 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The authors declare that there are no conflicts of interest present.