gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2026-17-1-0879CWALEKgtcrust-2211Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSТЕРМОМЕХАНИЧЕСКАЯ МОДЕЛЬ ПЛАВЛЕНИЯ ПРИ ДИССИПАЦИИ ТЕПЛА КАК ВОЗМОЖНОГО МЕХАНИЗМА ФОРМИРОВАНИЯ ПОСОЛЬНЕНСКОГО ГРАНИТОИДНОГО МАССИВА ЮЖНО-ЕНИСЕЙСКОГО КРЯЖАTHERMOMECHANICAL MODEL OF MELTING DURING HEAT DISSIPATION AS A POSSIBLE FORMATION MECHANISM FOR THE POSOLNAYA MASSIF OF GRANITOIDS OF THE SOUTH YENISEI RIDGEhttps://orcid.org/0000-0001-9732-5749СеменовА. Н.SemenovA. N.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

semenov@igm.nsc.ruhttps://orcid.org/0000-0003-2760-0754ПолянскийО. П.PolyanskyO. P.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ЗиновьевС. В.ZinovievS. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ПоповН. В.PopovN. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

НожкинА. Д.NozhkinA. D.

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 FederationИнститут нефтегазовой геологии и геофизики им. А.А. Трофимука СО РАНРоссияTrofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of SciencesRussian Federation202617022026171879879Copyright © Семенов А.Н., Полянский О.П., Зиновьев С.В., Попов Н.В., Ножкин А.Д., 20262026Семенов А.Н., Полянский О.П., Зиновьев С.В., Попов Н.В., Ножкин А.Д.Semenov A.N., Polyansky O.P., Zinoviev S.V., Popov N.V., Nozhkin A.D.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/2211

В работе представлены результаты выполненного 3D численного термомеханического моделирования процессов формирования гранитоидного Посольненского массива, расположенного в Посольно-Кузеевской тектонической зоне Южно-Енисейского кряжа. Предложена математическая численная модель образования массива за счет диссипации тепла при сдвиговых деформациях в Посольно-Кузеевской тектонической зоне. Моделирование проводилось в 3D-постановке при решении уравнения Навье-Стокса с использованием программного комплекса ANSYS Fluent. Рассмотрены варианты модели строения Посольно-Кузеевской тектонической зоны в отношении ширины активной области горизонтального сдвига и состава пород коры (метаморфический протолит) тектонической зоны. Модель диссипативного нагрева и плавления в сдвиговой зоне шириной 20 км воспроизводит реально наблюдаемую форму Посольненского массива. Определена зависимость высоты подъема магмы от реологических свойств пород коры. Показано, что при диссипативном тепловыделении при деформировании пород, характеризующихся реологией влажного гранита, реализуется плавление и диапировый подъем кислой магмы от основания гранитогнейсового слоя (45 км) до уровня 9–11 км. В модели коры, описываемой реологическими свойствами кислого гранулита, плавление происходит «на месте» в большем объеме, но без дальнейшего всплывания магматической массы. Показано, что скорость сдвига является одним из ключевых параметров эффективности диссипативного нагрева. Определено пороговое значение скорости сдвига – 4 см/год (и выше) для наиболее эффективного плавления и магматизма при диссипативном режиме.

The paper presents the results of 3D numerical thermomechanical modeling of the formation mechanism for the Posolnaya massif of granitoids in the Posolnaya-Kuzeeva tectonic zone of the South Yenisei Ridge. A mathematical numerical model has been proposed for the massif formation due to heat dissipation during shear deformations in the Posolnaya-Kuzeeva tectonic zone. The modeling was carried out in a 3D formulation by solving the Navier-Stokes equations using the ANSYS Fluent software package. Versions of the structural model of the Posolnaya-Kuzeeva tectonic zone have been considered in relation to the width of an active horizontal shear zone and composition of the crustal rocks (metamorphic protolith) from the tectonic zone. The model of dissipative heating and melting in a 20 km-wide shear zone reproduces the actually observed shape of the Posolnaya massif. The dependence between the height of magma ascent and the rheological properties of crustal rocks has been determined. It has been shown that dissipative heat release during the deformation of rocks, exhibiting the rheological properties of wet granite, results in melting and diapiric ascent of felsic magma from the base of the granite-gneiss layer (45 km) to a depth of 9–11 km. In a crustal model described by the rheological properties of felsic granulite, melting occurs "in situ" in a larger volume, but without further ascent of the magmatic mass. Shear rate is shown to be a key parameter for the efficiency of dissipative heating. A threshold shear rate for the most efficient melting and magmatism under dissipative conditions has been estimated at 4 cm/yr (and higher).

вязкие деформациидиссипация тепламеханизм плавленияПосольненский гранитоидный массивПосольно-Кузеевская тектоническая зонаАнгаро-Канский блокViscous deformationsheat dissipationmelting mechanismPosolnaya massif of granitoidsPosolnaya-Kuzeeva tectonic zoneAngara-Kan blockИсследование проведено при поддержке РНФ (грант № 21-77-20018-П) и частично по госзаданию ИГМ СО РАН (FWZN-2026-0016 и FWZN-2026-0018 – отбор образцов, выделение монофракции цирконов), ИНГГ СО РАН (FWZZ-2026-0042 – интерпретация геологических данных).The study was carried out with the financial support of RSF (grant No. 21-77-20018-P) and as part of the state assignment of IGM SB RAS (FWZN-2026-0016 and FWZN-2026-0018; sample collection, separation of zircon monofraction) and IPGG SB RAS (FWZZ-2026-0042; geological interpretation).ReferencesBurg J.-P., Gerya T.V., 2005. The Role of Viscous Heating in Barrovian Metamorphism: Thermomechanical Models and Application to the Lepontine Dome in the Central Alps. 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The authors declare that there are no conflicts of interest present.