gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2023-14-6-0725gtcrust-1755Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSМОДЕЛИ ФОРМИРОВАНИЯ ПОЛИФАЗНЫХ ГАББРО-МОНЦОДИОРИТОВЫХ МАССИВОВ ЗАПАДНОГО САНГИЛЕНА В КОЛЛИЗИОННОЙ И ТРАСФОРМНО-СДВИГОВОЙ ОБСТАНОВКЕMODELS FOR THE FORMATION OF POLYPHASE GABBRO-MONZODIORITE MASSIFS OF THE WESTERN SANGILEN IN THE COLLISIONAL AND TRANSTENSIONAL-SHEAR SETTINGSСеменовА. Н.SemenovA. N.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ПолянскийО. П.PolyanskyO. P.

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 Federation202314122023146725725Copyright © Семенов А.Н., Полянский О.П., 20232023Семенов А.Н., Полянский О.П.Semenov A.N., Polyansky O.P.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/1755

Разработана модель формирования интрузий коллизионного этапа 525–490 млн лет и модель магматизма трансформно-сдвигового этапа 465–440 млн лет в пределах Мугур-Чинчилигского и Эрзин-Нарынского блоков Западного Сангилена (Тува) для описания процесса коромантийного взаимодействия. Модельные эксперименты подтверждают петрологические данные о наличии многоуровневых камер при образовании Правотарлашкинского и Башкымугурского массивов. Предложенная модель описывает миграцию мантийных магм над головой мантийного плюма на коллизионном этапе и предполагает подъем магм по проницаемой тектонической зоне в мантийной литосфере и коре на трансформно-сдвиговом этапе. Результаты моделирования позволяют установить, что материал из магматического очага может достигать глубины вплоть до уровня верхней коры в соотношении объемной доли габброидов к диоритам от 1 : 2 до 3 : 4 и дополнительно привнести около 5 % объемной доли нижнекорового вещества.

Рассчитаны физические параметры исходных магм (вязкость, температура солидуса и ликвидуса, степень плавления в зависимости от температуры и состава, изменение плотности) с учетом реальных геохимических характеристик магматических пород из полифазных массивов Западного Сангилена.

A model for the formation of intrusions of the collision stage of 525–490 Ma and a model of magmatism of the transtensional shear stage of 465–440 Ma within the Mugur-Chinchilig and Erzin-Naryn blocks of Western Sangilen (Tuva) have been developed to describe the process of crust-mantle interaction. Model experiments confirm petrological data on the presence of multi-level chambers during the formation of the Pravotarlashkinsky and Bashkymugur massifs. The proposed model describes the migration of mantle magmas above the head of the mantle plume at the collision stage and assumes the rise of magmas along a permeable tectonic zone in the mantle lithosphere and crust at the transtensional-shear stage. The modeling results allow us to establish that material from the magma chamber can reach depths of the upper crust in the volume ratio of gabbroids to diorites from 1 : 2 to 3 : 4 and additionally introduce about 5 % of the volume fraction of lower crustal material.

The physical parameters of the primary magmas (viscosity, solidus and liquidus temperatures, degree of melting depending on temperature and composition, change in density) were calculated taking into account the real geochemical characteristics of igneous rocks from the polyphase massifs of Western Sangilen.

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