gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-3-0635gtcrust-1527Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSМЕТАТЕРРИГЕННЫЕ ПОРОДЫ ОЛЬХОНСКОГО ТЕРРЕЙНА ЦЕНТРАЛЬНО-АЗИАТСКОГО СКЛАДЧАТОГО ПОЯСА: U-Pb ВОЗРАСТ ЦИРКОНОВ, ГЕОХИМИЧЕСКАЯ ХАРАКТЕРИСТИКА И МОДЕЛИ ФОРМИРОВАНИЯ ОСАДОЧНЫХ ПРОТОЛИТОВMETATERRIGENIOUS ROCKS OF THE OLKHON TERRANE OF THE CENTRAL ASIAN OROGENIC BELT: U-Pb ZIRCON AGE, GEOCHEMICAL CHARACTERISTICS, AND FORMATION MODELS OF SEDIMENTARY PROTOLITHSДонскаяТ. В.DonskayaT. V.

664033, Иркутск, ул. Лермонтова, 128, Россия 

128 Lermontov St, Irkutsk 664033, Russia 

tanlen@crust.irk.ruГладкочубД. П.GladkochubD. P.

664033, Иркутск, ул. Лермонтова, 128, Россия 

128 Lermontov St, Irkutsk 664033, Russia 

МазукабзовА. М.MazukabzovA. M.

664033, Иркутск, ул. Лермонтова, 128, Россия 

128 Lermontov St, Irkutsk 664033, Russia 

СкляровЕ. В.SklyarovE. V.

664033, Иркутск, ул. Лермонтова, 128, Россия 

128 Lermontov St, Irkutsk 664033, Russia 

ХубановВ. Б.KhubanovV. B.

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

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

ДемонтероваЕ. И.DemonterovaE. I.

664033, Иркутск, ул. Лермонтова, 128, Россия 

128 Lermontov St, Irkutsk 664033, Russia 

МотоваЗ. Л.MotovaZ. L.

664033, Иркутск, ул. Лермонтова, 128, Россия 

128 Lermontov St, Irkutsk 664033, Russia 

Институт земной коры СО РАНРоссияInstitute of the Earth’s Crust, 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 Federation202219092022133635635Copyright © Донская Т.В., Гладкочуб Д.П., Мазукабзов А.М., Скляров Е.В., Хубанов В.Б., Демонтерова Е.И., Мотова З.Л., 20222022Донская Т.В., Гладкочуб Д.П., Мазукабзов А.М., Скляров Е.В., Хубанов В.Б., Демонтерова Е.И., Мотова З.Л.Donskaya T.V., Gladkochub D.P., Mazukabzov A.M., Sklyarov E.V., Khubanov V.B., Demonterova E.I., Motova Z.L.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/1527

Проведено петрографическое, геохимическое и Sm-Nd изотопно-геохимическое изучение гнейсов из разных тектонических зон Ольхонского террейна Центрально-Азиатского складчатого пояса, а также анализ составов гранатов и возраста цирконов в этих метатерригенных породах. Установлено, что гранат-биотитовые гнейсы зоны Анга-Сахюрты, так же как гранатсодержащие и безгранатовые гнейсы (гранулиты) Чернорудской зоны, в неметаморфизованном состоянии представляли собой незрелые терригенные породы полимиктового или грауваккового состава, близкие по геохимическим характеристикам породам континентальных дуг. В то же время проанализированные гнейсы этих зон обнаруживают как сходства, так и некоторые отличия геохимических и изотопных характеристик, в том числе вариации значений ɛNd(T) от –0.2 до –9.0, что может свидетельствовать о различных пропорциях того или иного источника в их субстрате. Возраст большинства зерен детритовых цирконов в гнейсах Чернорудской зоны и зоны Анга-Сахюрты соответствует временному интервалу 530–1000 млн лет, а самые молодые зерна детритового циркона имеют возраст в диапазоне 522–537 млн лет. Совокупность геохимических и геохронологических данных по гнейсам Чернорудской зоны и зоны Анга-Сахюрты дает основание считать, что протолиты этих гнейсов могли быть образованы в результате разрушения одних и тех же источников преимущественно неопротерозойского возраста. Предполагается, что субстраты гнейсов первоначально могли являться осадками континентального склона композитного неопротерозойского сооружения, присоединенного к Сибирской платформе на рубеже 600‒610 млн лет. Снос обломочного материала с этого композитного супертеррейна, обеспечившего накопление терригенного субстрата изученных гнейсов, осуществлялся в сторону Палеоазиатского океана. Самые молодые цирконы с возрастом около 530 млн лет могли поступать в бассейн седиментации из магматических комплексов, прорывающих неопротерозойское композитное сооружение. Гранат-биотитовые гнейсы Крестовской зоны по химическому составу близки незрелым граувакковым песчаникам. Значение ɛNd(T) в этих гнейсах составляет –3.7. Детритовые цирконы в гнейсах Крестовской зоны образуют возрастные пики на отметках 780‒820 и 498‒515 млн лет. Комбинация геохимических и геохронологических данных позволила сделать вывод, что субстраты этих гнейсов могли быть образованы во внутриконтинентальном бассейне, сформированном на орогенном этапе в ходе аккреционно-коллизионных событий при сочленении блока Орсо и Бирхинской островодужной системы в единую Крестовскую зону.

В процессе формирования раннепалеозойского Ольхонского террейна все терригенные породы, являющиеся протолитами гнейсов, на временном интервале 460–510 млн лет в условиях гранулитовой или амфиболитовой фации испытали метаморфизм, связанный с аккреционными и коллизионными событиями, которые и привели к возникновению единого композитного Ольхонского террейна.

The paper presents a petrographic, geochemical, and Sm-Nd isotopic data on the gneisses from different tectonic zones of the Olkhon terrane of the Central Asian Orogenic Belt, as well as the composition of garnets and the age of zircons in these metaterrigenous rocks. The garnet-biotite gneisses of the Anga-Sakhurta zone, as well as the garnet-bearing and garnet-free gneisses (granulites) of the Chernorud zone may result from metamorphism of immature terrigenous rocks of polymictic or greywacke compositions similar in geochemical characteristics to rocks of continental arcs. At the same time, the gneisses of these zones show both similarities and some differences in geochemical and isotopic characteristics, including variations in ɛNd(T) values from –0.2 to –9.0, which may indicate different proportions of one or another source in their protoliths. The age of most detrital zircons in the gneisses of the Chernorud and Anga-Sakhurta zones corresponds to 530–1000 Ma, and the youngest detrital zircons have an age of 522–537 Ma. The geochemical and geochronological data on the gneisses of the Chernorud and Anga-Sakhyurta zones suggests that the protoliths of these gneisses could be formed from the same sources of predominantly Neoproterozoic age. We assumed that gneiss protoliths could initially be sediments of the continental slope of Neoproterozoic composite terrane assembled to the Siberian Platform at 600‒610 Ma. The transport of clastic material being gneiss protoliths from this composite terrane, took place towards the Paleo-Asian Ocean. The youngest zircons with an age of about 530 Ma could be generated from igneous complexes intruding the Neoproterozoic composite superterrane. The garnet-biotite gneisses of the Krestovskaya zone are similar in chemical composition to immature graywacke sandstones, The ɛNd(T) value in these gneisses is –3.7. Detrital zircons in the gneisses of the Krestovskaya zone form age peaks at 780–820 and 498–515 Ma. Based on geochemical and geochronological data we assume that these gneisses could be formed in an intracontinental basin formed at the orogenic stage during accretionary-collisional events at the amalgamation the Orso block and the Birkhin island arc into the Krestovskaya zone.All terrigenous rocks being gneiss protoliths were metamorphosed at 460–510 Ma under granulite or amphibolite facies associated with accretionary and collisional events, which led to the formation of the Early Paleozoic Olkhon composite terrane.

гнейсыгеохимиядетритовые цирконыОльхонский террейнЦентрально-Азиатский складчатый поясgneissesgeochemistrydetrital zirconsOlkhon terraneCentral Asian Orogenic BeltИсследования выполнены при поддержке Российского фонда фундаментальных исследований (грант № 20-05-00005) и Правительства Российской Федерации (грант № 075-15-2019-1883). В работе задействовалось оборудование ЦКП «Геодинамика и геохронология» Института земной коры СО РАН в рамках гранта № 075-15-2021-682. U-Pb изотопно-геохронологические исследования выполнены в ЦКП «Геоспектр» ГИН СО РАН, г. Улан-Удэ (базовый проект IX.129.1.2., № АААА-А21-121011390002-2).The study was supported by the Russian Foundation for Basic Research (Grant 20-05-00005) and the Russian Government (Grant 075-15-2019-1883). Equipment of Shared Research Facilities "Geodynamics and Geochronology" of IEC SB RAS was used in the work within the framework of grant 075-15-2021-682. 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The authors declare that there are no conflicts of interest present.