gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2019-10-2-0416gtcrust-843Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSРОЛЬ МАГМАТИЧЕСКИХ ИСТОЧНИКОВ ТЕПЛА ПРИ ФОРМИРОВАНИИ РЕГИОНАЛЬНОГО И КОНТАКТОВЫХ МЕТАМОРФИЧЕСКИХ АРЕАЛОВ ЗАПАДНОГО САНГИЛЕНА (ТУВА)THE ROLE OF MAGMATIC HEAT SOURCES IN THE FORMATION OF REGIONAL AND CONTACT METAMORPHIC AREAS IN WEST SANGILEN (TUVA, RUSSIA)https://orcid.org/0000-0003-2760-0754ПолянскийО. П.PolyanskyO. P.

Олег Петрович Полянский - доктор геолого-минералогических наук, заведующий лабораторией

630090, Новосибирск, просп. Академика Коптюга, 3

3 Academician Koptyug ave, Novosibirsk 630090

pol@igm.nsc.ruКаргополовС. А.KargopolovS. A.

Сергей Анатольевич Каргополов - кандидат геолого-минералогических наук, научный сотрудник

630090, Новосибирск, просп. Академика Коптюга, 3, 

630090, Новосибирск, ул. Пирогова, 2

3 Academician Koptyug ave, Novosibirsk 630090, 2 Pirogov street, Novosibirsk 630090

kargo@igm.nsc.ruИзохА. Э.IzokhA. E.

Андрей Эмильевич Изох - доктор геолого-минералогических наук, профессор

630090, Новосибирск, просп. Академика Коптюга, 3, 

630090, Новосибирск, ул. Пирогова, 2

Andrei E. Izokh - Doctor of Geology and Mineralogy, Professor

3 Academician Koptyug ave, Novosibirsk 630090, 

2 Pirogov street, Novosibirsk 630090

izokh@igm.nsc.ruhttps://orcid.org/0000-0001-9732-5749СеменовА. Н.SemenovA. N.

Александр Николаевич Семенов - аспирант

630090, Новосибирск, просп. Академика Коптюга, 3

Aleksander N. Semenov - Post Graduate Student

3 Academician Koptyug ave, Novosibirsk 630090

semenov@igm.nsc.ruБабичевА. В.BabichevA. V.

Алексей Владимирович Бабичев - кандидат физико-математических наук, старший научный сотрудник

630090, Новосибирск, просп. Академика Коптюга, 3

3 Academician Koptyug ave, Novosibirsk 630090

babichev@igm.nsc.ruhttps://orcid.org/0000-0002-8732-6198ВасилевскийА. Н.VasilevskyA. N.

Александр Николаевич Василевский – научный сотрудник

630090, Новосибирск, пр. Академика Коптюга, 3, 

630090, Новосибирск, ул. Пирогова, 2

Aleksander N. Vasilevsky - Researcher

3 Academician Koptug ave., Novosibirsk 630090, 

2 Pirogov street, Novosibirsk 630090

VasilevskiyAN@ipgg.sbras.ruИнститут геологии и минералогии им. В.С. Соболева СО РАНРоссияV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RASRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАН; Новосибирский национальный исследовательский государственный университетРоссияV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RAS; Novosibirsk State UniversityRussian FederationИнститут нефтегазовой геологии и геофизики им. А.А. Трофимука СО РАН; Новосибирский национальный исследовательский государственный университетРоссияA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RAS; Novosibirsk State UniversityRussian Federation201923062019102309323Copyright © Полянский О.П., Каргополов С.А., Изох А.Э., Семенов А.Н., Бабичев А.В., Василевский А.Н., 20192019Полянский О.П., Каргополов С.А., Изох А.Э., Семенов А.Н., Бабичев А.В., Василевский А.Н.Polyansky O.P., Kargopolov S.A., Izokh A.E., Semenov A.N., Babichev A.V., Vasilevsky A.N.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/843

Тектономагматическая эволюция Сангиленского массива детально охарактеризована в многочисленных публикациях, в то время как источникам тепла при метаморфизме НТ/LР‐типа уделялось мало внимания. Моделирование процессов транспорта магм на верхнекоровые уровни является актуальным, так как для Западного Сангилена устанавливается связь метаморфизма НТ/LР‐типа с габбро‐монцодиоритовыми интрузиями. Статья посвящена результатам термомеханического моделирования порционного режима плавления и подъема расплавов в коре с наличием плотностных границ. Объект моделирования – Эрзинский гранитоидный массив. Показано, что в отличие от диапирового всплывания механизм подъема магмы при фракционном плавлении оказывается принципиально иным – в форме просачивания по магматическому каналу (системе кана‐ лов). Оценено, что скорости подъема диапиров в земной коре (0.8 см/год) более чем на порядок ниже скорости миграции расплава при фракционном плавлении, которая составляет 25 см/год. Показано, что этапы развития метаморфической термальной «антиклинали» могли быть обусловлены разным режимом плавления материала коры: на первом этапе –порционного типа, на втором –фракционного. Смена режимов плавления от условий плавления в «закрытой» системе к условиям фракционного плавления в «открытых» системах, вероятно, определялась тектоническими факторами. Сделаны оценки степени плавления в гранулитовом (6 об. %), гранитном (15 об. %) и осадочно‐метаморфическом (5 об. %) слое коры Сангиленского массива.

The tectonomagmatic evolution of the Sangilen massif has been described in detail in numerous publications, but little attention was given to heat sources related to the HT/LP metamorphism. Modeling of the magma transport to the upper‐crust levels in West Sangilen shows that the NT/LP metamorphism is related to gabbromonodiorite intrusions. This article is focused on the thermo‐mechanical modeling of melting and lifting of melts in the crust, taking into account the density interfaces. The model of the Erzin granitoid massif shows that in case of fractional melting, the magma ascent mechanism is fundamentally different, as opposed to diapir upwelling – percolation take place along a magmatic channel or a system of channels. An estimated rate of diapiric rise in the crust amounts to 0.8 cm/yr, which is more than an order of magnitude lower than the rate of melt migration in case of fractional melting (25 cm/yr). In our models, a metamorphic thermal ‘anticline’ develops in stages that differ, probably, due to the modes of crust melting: batch melting occurs at the first stage, and fractional melting takes place at the second stage. It is probable that the change of melting modes from melting conditions in a ‘closed’ system to fractional melting conditions in ‘open’ systems is determined by tectonic factors. For the Sangilen massif, we have estimated the degrees of melting in the granulite, granite, and sedimentary‐metamorphic layers of the crust (6, 15, and 5 vol. %, respectively).

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