gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-5-0668gtcrust-1579Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSНЕОПРОТЕРОЗОЙСКАЯ АКТИВНАЯ КОНТИНЕНТАЛЬНАЯ ОКРАИНА ДЗАБХАНСКОГО ПАЛЕОМИКРОКОНТИНЕНТА (МОНГОЛИЯ): РЕЗУЛЬТАТЫ ИЗОТОПНО-ГЕОХРОНОЛОГИЧЕСКИХ ИССЛЕДОВАНИЙAN ACTIVE NEOPROTEROZOIC CONTINENTAL MARGIN OF THE ZAVKHAN MICROCONTINENT (MONGOLIA): ISOTOPIC-GEOCHRONOLOGICAL EVIDENCEШкольникС. И.ShkolnikS. I.

664033, Иркутск, ул. Лермонтова, 128

630090, Новосибирск, пр-т Академика Коптюга, 3

128 Lermontov St, Irkutsk 664033

3 Academician  Koptyug Ave, Novosibirsk 630090 

ЛетниковаЕ. Ф.LetnikovaE. F.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

РезницкийЛ. З.ReznitskyL. Z.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

Институт земной коры СО РАН; Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences; Sobolev Institute of Geology and Mineralogy, 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 FederationИнститут земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesRussian Federation202210122022135668668Copyright © Школьник С.И., Летникова Е.Ф., Резницкий Л.З., 20222022Школьник С.И., Летникова Е.Ф., Резницкий Л.З.Shkolnik S.I., Letnikova E.F., Reznitsky L.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/1579

Приведены результаты исследования разреза мощной (не менее 2–3 км), протяженной (более 200 км) вулканогенной цосулинской (яргайт) свиты на юге Дзабханского террейна Центрально-Азиатского складчатого пояса. Свита сложена эффузивами субщелочной базальт-андезит-дацит-риолитовой серии, их туфами, туффитами, игнимбритами и терригенными породами, находящимися в частом переслаивании. Преобладают кислые породы над основными и туффогенные над эффузивами. По ряду признаков накопление толщи происходило в субаэральной обстановке с эксплозивными наземными извержениями, а петрогеохимические особенности эффузивов типичны для условий субдукции. Эффузивы кислого и среднего состава характеризуются большими отрицательными значениями εNd – от −11.5 до −12.8 и раннедокембрийским модельным возрастом TNd(DM)=2.4–2.5 млрд лет, что указывает на присутствие на глубине древней коры и на ее вовлечение в магму. Полученные факты свидетельствуют в пользу образования вулканитов в условиях активной континентальной окраины. Крайние временные границы, в пределах которых формировалась окраинно-континентальная система по результатам U-Pb определений по цирконам методом LA-ICP-MS, оцениваются в ~860–780 млн лет.

Цосулинская (яргайт) свита по строению и составу вулканитов близка дзабханской свите одноименного террейна и сархойской серии Тувино-Монгольского массива и частично перекрывается с ними по времени образования. Таким образом, все три вулканогенные толщи сформировались в однотипной геодинамической обстановке, в одном временном интервале и являются фрагментами континентальной вулканической дуги, общей для Дзабханского и Тувино-Монгольского палеомикроконтинентов.

There have been presented the results of the study of a thick (no less than 2–3 km), extended (for more than 200 km) volcanogenic formation (Tsetsen-Uul or Yargait) in the south of the Zavkhan terrane of the Central Asian fold belt. The formation is an assemblage of frequently intercalating effusive rocks of the subalkaline basalt-andesite-dacite-rhyolite series, their tuffs, tuffites, ignimbrites, and terrigenous rocks. Felsic rocks dominate over basites, and tuffogenic rocks dominate over effusives. There is some evidence that the formation emerged in a subaerial setting, with explosive eruptions, and the petrogeochemical features of the effusive rocks are typical for subduction environment. The felsic effusive rocks have high negative εNd from –11.5 to –12.8 and Early Precambrian model age TNd(DM)=2.4–2.5 Ga, which indicates the presence of an ancient crust at the depth and its involvement in magma. The evidence supports the formation of volcanic rocks within an active continental margin. The continental-margin formation stage ranges from ~860 Ma to ~780 Ma based on the LA-ICP-MS U-Pb dating of zircons.

The Tsetsen-Uul (Yargait) formation is similar in structure and composition to the Zavkhan formation of the Zavkhan terrane and the Sarkhoi group of the Tuva-Mongolian massif, and partially overlaps them in formation time. It is concluded that all three volcanogenic formations emerged in the same geodynamic setting and in the same time interval, and are the fragments of a continental volcanic arc belonging to both Zavkhan and Tuva-Mongolian paleomicrocontinents.

Центрально-Азиатский складчатый пояснеопротерозойДзабханский террейнвулканитымагматогенные цирконыU-Pb геохронологияNd-изотопияпетрогеохимияактивная континентальная окраинаCentral Asian fold beltNeoproterozoicZavkhan terranevolcanic rocksmagmatic zirconsU-Pb-geochronologyNd-isotopypetrogeochemistryactive continental marginИсследования выполнены за счет средств Российского научного фонда (проекты № 19-17-00099, № 21-17-00052). В работе задействовалось оборудование и инфраструктура Центра коллективного пользования «Геодинамика и геохронология» Института земной коры СО РАН (грант № 075-15-2021-682).The studies were financed by the Russian Science Foundation (projects 19-17-00099, 21-17-00052). The work was conducted using equipment and infrastructure of the Centre for Geodynamics and Geochronology at the Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences (grant 075-15-2021-682).ReferencesBelichenko V.G., Boos R.G., 1988. 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The authors declare that there are no conflicts of interest present.