gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2023-14-2-0693gtcrust-1664Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSК ВОПРОСУ О ПАЛЕОТЕКТОНИЧЕСКОЙ ПРИНАДЛЕЖНОСТИ ПРОТОЛИТА СУВАНЯКСКОГО МЕТАМОРФИЧЕСКОГО КОМПЛЕКСА (ЮЖНЫЙ УРАЛ) ПО РЕЗУЛЬТАТАМ U-Th-Pb ДАТИРОВАНИЯ ЗЕРЕН ДЕТРИТОВОГО ЦИРКОНАON PALEOTECTONIC BELONGING OF THE SUVANYAK METAMORPHIC COMPLEX (SOUTHERN URALS) FROM THE U-Th-Pb DATING OF DETRITAL ZIRCON GRAINShttps://orcid.org/0000-0002-2609-6835ГолионкоБ. Г.GolionkoB. G.

119017, Москва, Пыжевский пер., 7, стр. 1

7-1 Pyzhevsky Ln, Moscow 119017

https://orcid.org/0000-0002-7285-6460КузнецовН. Б.KuznetsovN. B.

119017, Москва, Пыжевский пер., 7, стр. 1

664033, Иркутск, ул. Лермонтова, 128

7-1 Pyzhevsky Ln, Moscow 119017

128 Lermontov St, Irkutsk 664033

https://orcid.org/0000-0001-6838-7596СтрашкоА. В.StrashkoA. V.

119017, Москва, Пыжевский пер., 7, стр. 1

7-1 Pyzhevsky Ln, Moscow 119017

https://orcid.org/0000-0002-0495-1466РоманюкТ. В.RomanyukT. V.

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

10-1 Bolshaya Gruzinskaya St, Moscow 123242

https://orcid.org/0000-0002-5943-719XНовиковаА. С.NovikovaA. S.

119017, Москва, Пыжевский пер., 7, стр. 1

7-1 Pyzhevsky Ln, Moscow 119017

 

https://orcid.org/0000-0001-9364-5876ДубенскийА. С.DubenskyA. S.

119017, Москва, Пыжевский пер., 7, стр. 1

119991, Москва, Ленинские горы, 1

7-1 Pyzhevsky Ln, Moscow 119017

1 Leninskie Gory, Moscow 119991

https://orcid.org/0000-0001-9311-8849ШешуковВ. С.SheshukovV. S.

119017, Москва, Пыжевский пер., 7, стр. 1

7-1 Pyzhevsky Ln, Moscow 119017

https://orcid.org/0000-0002-0785-6026ЕрофееваК. Г.ErofeevaK. G.

119017, Москва, Пыжевский пер., 7, стр. 1

7-1 Pyzhevsky Ln, Moscow 119017

Геологический институт РАНРоссияGeological Institute, Russian Academy of SciencesRussian FederationГеологический институт РАН; Институт земной коры СО РАНРоссияGeological Institute, Russian Academy of Sciences; Institute of the Earth’s Crust, 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 FederationГеологический институт РАН; Московский государственный университет им. М. В. ЛомоносоваРоссияGeological Institute, Russian Academy of Sciences; Lomonosov Moscow State UniversityRussian Federation202319042023142693693Copyright © Голионко Б.Г., Кузнецов Н.Б., Страшко А.В., Романюк Т.В., Новикова А.С., Дубенский А.С., Шешуков В.С., Ерофеева К.Г., 20232023Голионко Б.Г., Кузнецов Н.Б., Страшко А.В., Романюк Т.В., Новикова А.С., Дубенский А.С., Шешуков В.С., Ерофеева К.Г.Golionko B.G., Kuznetsov N.B., Strashko A.V., Romanyuk T.V., Novikova A.S., Dubensky A.S., Sheshukov V.S., Erofeeva K.G.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/1664

Проведено изотопное U-Th-Pb датирование зерен детритового циркона кварцитов суванякского метаморфического комплекса, слагающего Суванякскую тектоническую единицу, образующую западную часть поднятия Уралтау – весьма протяженного (более 200 км при ширине до 20 км) близмеридионального структурного элемента, расположенного на востоке Западно-Уральской мегазоны и занимающего осевое положение в строении южного сегмента палеозоид на Южном Урале. Результаты изотопного датирования зерен детритового циркона из кварцитов южной части суванякского метаморфического комплекса (пробы G18-1 и R14-396)показывают, что многочисленные популяции зерен обломочного циркона поздненеопротерозойско-раннекембрийского возраста позволяют предположить пери-Гондванское происхождение первичных источников сноса обломочного материала для протолита изученных пород.

В структуре Суванякской тектонической единицы участвуют разновозрастные метаморфические образования – раннепалеозойские на юге и позднедокембрийские на севере – с различающимися изотопно-геохронологическими характеристиками протолита, в настоящее время формально объединенные в единый суванякский метаморфический комплекс. Их разграничение в структуре Суванякской тектонической единицы требует про-ведения дополнительных исследований.

Для позднепалеозойской юго-восточной окраины палеоконтинента Балтика (в тот момент уже вовлеченной в строение композитного континента Аркт-Лавруссия) по результатам изотопно-геохронологического изучения детритового циркона из осадочных и метаосадочных толщ Южного Урала намечен ряд следующих тектонических структур. Около юго-восточного края окраины располагался поздненеопротерозойско-раннекембрийский океанический бассейн, внутри которого в период 650–520 млн лет была активна вулканическая дуга или дуги. В строение юго-восточного края окраины были вовлечены пери-Гондванский террейн или террейны (? кадомского типа), а также мощные рифей-раннепалеозойские осадочные толщи, автохтонные Балтике.

U-Th-Pb isotope dating of grains of detrital zircon from quartzites of the Suvanyak metamorphic complex, which forms the Suvanyak tectonic unit that forms the western part of the Uraltau uplift, located in the east of the West Ural megazone in the Southern Urals. The results of isotope dating of grains of detrital zircon from quartzites of the southern part of the Suvanyak metamorphic complex (samples G18-1 and R14-396) show that numerous populations of Late Neoproterozoic–Early Cambrian detrital zircon grains suggest a Peri-Gondwanan origin of the primary sources of detrital material for the protolith of the studied rocks.

The structure of the Suvanyak tectonic unit involves metamorphic formations of different ages – Early Paleozoic in the south and Late Precambrian in the north, which are now formally united into a single Suvanyak metamorphic complex. Their differentiation requires additional research.

For the Late Paleozoic southeastern margin of the Baltica (at that time already involved in the structure of the composite continent Arct-Laurussia), according to the results of isotope-geochronological study of detrital zircon from the sedimentary and metasedimentary sequences of the Southern Urals, a number of the following tectonic structures were identified. Near the southeastern edge of the margin, there was a Late Neoproterozoic–Early Cambrian oceanic basin, within which a volcanic arc or arcs were active during 650–520 Ma. The structure of the southeastern edge of the margin included the Peri-Gondwanan terrane or terranes (? Cadomian type), as well as thick Riphean-Early Paleozoic sedimentary sequences, autochthonous to the Baltica.

зона Уралтаусуванякский метаморфический комплексзерна детритового цирконаU-Th-Pb датированиепервичные источники сносаUraltau zoneSuvanyak metamorphic complexdetrital zircon grainsU-Th-Pb datingprimary sourcesИсследования выполнены в соответствии с планами по темам госзаданий ГИН РАН и ИФЗ РАН, аналитические результаты и их обработка – при финансовой поддержке МОН РФ (мегагрант МОН РФ 075-15-2019-1883 «Орогенез: образование и рост континентов и суперконтинентов»). Авторы благодарны М.М. Буслову и Т.С. Зайцевой за высококвалифицированное рецензирование статьи; высказанные замечания способствовали ее значительному улучшению.This research was performed in the framework of the state assignment of the GIN RAS and IPhE RAS, and the analytical results obtained were processed with the financial support of the MSHE RF (megagrant MSHE RF 075-15-2019-1883 "Orogenesis: formation and growth of continents and supercontinents").ReferencesAbbo A., Avigad D., Gerdes A., 2020. 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The authors declare that there are no conflicts of interest present.