gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2021-12-4-0563gtcrust-1375Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSМОДЕЛИРОВАНИЕ ТЕПЛОГЕНЕРАЦИИ ПРИ ТРЕНИИ И ВЯЗКОПЛАСТИЧЕСКОЙ ДЕФОРМАЦИИ НА ПРИМЕРЕ ПРИЕНИСЕЙСКОЙ СДВИГОВОЙ ЗОНЫ (ВОСТОЧНАЯ СИБИРЬ)MODELLING HEAT GENERATION DURING FRICTION AND VISCOPLASTIC DEFORMATION BASED ON THE EXAMPLE OF THE YENISEI SHEAR ZONE (EASTERN SIBERIA)ПолянскийО. П.PolyanskyO. P.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

БабичевА. В.BabichevA. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

СеменовА. Н.SemenovA. N.

630090, Новосибирск, пр-т Академика Коптюга, 3

Alexander N. Semenov

3 Academician Koptyug Ave, Novosibirsk 630090

semenov@igm.nsc.ruРевердаттоВ. В.ReverdattoV. V.

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 Federation202114122021124909928Copyright © Полянский О.П., Бабичев А.В., Семенов А.Н., Ревердатто В.В., 20212021Полянский О.П., Бабичев А.В., Семенов А.Н., Ревердатто В.В.Polyansky O.P., Babichev A.V., Semenov A.N., Reverdatto V.V.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/1375

В зонах дислокационного неопротерозойского метаморфизма Приенисейской региональной сдвиговой зоны (ПРСЗ) (Восточная Сибирь) геотермобарометрическими методами зафиксированы отклонения РТ-параметров от фоновых значений, соответствующих литостатическому давлению и стандартной палеогеотерме, характерной для соседних блоков коры Енисейского кряжа. Для объяснения причин значительных отклонений условий метаморфизма при сдвиге и коллизии нами разработаны 3D и 2D термомеханические численные модели. В работе представлены результаты двух- и трехмерного моделирования диссипативного нагрева при трении и вязкопластических деформациях. Результаты моделирования сравниваются с геологическими данными о степени метаморфизма и масштабе деформаций ПРСЗ. Детально рассматривается вопрос о соотношении величины тепловыделения при трении на контакте блоков сдвиговых разломов либо при вязких деформациях в реологически расслоенной зоне тектонического течения и бластомилонитизации. Получены оценки величины диссипативного нагрева при типичных параметрах сдвиговых зон, а также с учетом наличия расплава. Модель вязкого деформирования сдвиговой зоны конечной ширины в неоднородной по реологии и составу коре предсказывает диссипативный нагрев на 200–310 °С при скорости деформации 2–4 см/год. Модель обдукции тектонической пластины со скоростью надвигания 5 см/год дает оценки нагрева пород при трении на контакте блоков не более 130–190 °С. Характерное время установления стационарного режима диссипативного нагрева в режиме сдвига составляет 6–8 млн лет. Для метаморфических комплексов ПРСЗ диссипативный нагрев мог являться тепловым источником метаморфизма и мигматизации, однако условия формирования крупных гранитных интрузий не достигались.

Deviations of the РТ parameters from the background values, corresponding to the lithostatic pressure and the standard geotherm characteristic of the neighboring crustal blocks of the Yenisei Ridge, were recorded by geothermobarometry in the zones of dislocation metamorphism of the Yenisei regional shear zone (Eastern Siberia). To explain the reason for large deviations from metamorphic conditions for shear and collision, we worked out 3D and 2D thermomechanical numerical models. The paper presents two- and three-dimensional models of dissipative heating during friction and visco-plastic deformations. The modelling results are compared with geological observations on the metamorphic grade and the scale of deformations of the Yenisei regional shear zone. A detailed consideration is being given to the ratio of heat released during friction at the contact of shear fault blocks, or during viscous deformations of the rheologically layered zone of tectonic flow and blastomylonitization. Estimates of the magnitude of dissipative heating are obtained for typical parameters of shear zones. The model of viscous deformation of a shear zone of finite width, taking into account the rheological layering of the crust, predicts dissipative heating by 200–310 °C at strain rates of 2–4 cm/year. The model of obduction of the tectonic plate with a thrusting velocity of 5 cm/year yields estimates of frictional heating of rocks at the contact of blocks no higher than 130–190 °C. The characteristic time period of the stationary dissipative regime formation is 6–8 million years. Dissipative heating could be a heat source for the metamorphic complexes of the Yenisei regional shear zone, though melting conditions of metapelite were not attained.

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