gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2026-17-1-0873YTQJKUgtcrust-2203Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSПЕТРОГЕНЕЗИС ГРАНИТОИДНОГО МАГМАТИЗМА S-ТИПА НА ОКРАИНЕ ТУВИНО-МОНГОЛЬСКОГО МАССИВА (ЗАПАДНЫЙ САНГИЛЕН, ЮГО-ВОСТОЧНАЯ ТУВА): ОБСТАНОВКИ, ВОЗРАСТ И СТАДИИ СТАНОВЛЕНИЯPETROGENESIS OF S-TYPE GRANITOID MAGMATISM ON THE MARGIN OF THE TUVA-MONGOLIAN MASSIF (WESTERN SANGILEN, SOUTHEASTERN TUVA): SETTINGS, AGE, AND FORMATION STAGEShttps://orcid.org/0000-0002-9603-4234КармышеваИ. В.KarmyshevaI. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

iri@igm.nsc.ruhttps://orcid.org/0000-0002-2996-3789ВладимировВ. Г.VladimirovV. G.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ШемелинаО. В.ShemelinaO. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0002-8798-377XСеменоваД. В.SemenovaD. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0001-9810-9108ЯковлевВ. А.YakovlevV. A.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ПронякинЕ. А.PronyakinE. A.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

СмоляковаА. Е.SmolyakovaA. E.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian Federation202617022026171873873Copyright © Кармышева И.В., Владимиров В.Г., Шемелина О.В., Семенова Д.В., Яковлев В.А., Пронякин Е.А., Смолякова А.Е., 20262026Кармышева И.В., Владимиров В.Г., Шемелина О.В., Семенова Д.В., Яковлев В.А., Пронякин Е.А., Смолякова А.Е.Karmysheva I.V., Vladimirov V.G., Shemelina O.V., Semenova D.V., Yakovlev V.A., Pronyakin E.A., Smolyakova A.E.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/2203

В настоящей работе на основе изотопно-геохронологических (циркон, U-Pb метод), петрогеохимических, структурно-петрологических данных, а также исследований составов граната и распределения флюидных включений в кварце из лейкогранитов приводится характеристика гранитоидного магматизма S-типа на конвергентной окраине Тувино-Монгольского массива (Западный Сангилен, Юго-Восточная Тува). Граниты S-типа слагают небольшие тела гранатовых, гранат-кордиеритовых гранитов и жильные тела лейкогранитов. Их образование происходило на двух этапах тектономагматической активности. Первый этап (517±3 млн лет) связан с заложением тектонической зоны и характеризуется мигматизацией и образованием гранат-кордиеритовых гранитов при Т=730–790 °С и Р=5.3 кбар. На втором этапе (490–483 млн лет) в обстановках локального растяжения произошел повторный прогрев до ~680 °С, что привело к реоморфизму раннекембрийских мигматитгранитов. Жилы лейкогранитов (480±6 млн лет) представляют собой неосомы мигматитов, образовавшиеся при Т=760–830 °C на низкой степени плавления (<20 %) кордиерит-гранат-биотитовых мигматитов.

This study integrates the isotope-geochronological (zircon U-Pb dating), petrogeochemical and structural-petrological data, as well as the data on garnet composition and fluid inclusions in leucogranite quartz, to characterize S-type granitoid magmatism on the margin of the Tuva-Mongolian massif (Western Sangilen, Southeastern Tuva). The S-type granites form small garnet-, garnet-cordierite-bearing granite and leucogranite vein bodies. Their formation occurred during two stages of tectono-magmatic activity. The first stage (517±3 Ma) relates to the initiation of a tectonic zone and is characterized by migmatization and garnet-cordierite granite formation at T=730–790 °C and P=5.3 kbar. The second stage (490–483 Ma) of local extension involved repeated heating to ~680 °C, which led to rheomorphism of the Early Cambrian migmatite-granites. The leucogranite veins (480±6 Ma) represent neosomes of migmatites, formed at T=760–830 °C via low-degree melting (<20 %) of cordierite-garnet-biotite migmatites.

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