The role of magmatic heat sources in the formation of regional and contact metamorphic areas in West Sangilen (Tuva, Russia)

O. P. Polyansky; S. A. Kargopolov; A. E. Izokh; A. N. Semenov; A. V. Babichev; A. N. Vasilevsky

doi:10.5800/GT-2019-10-2-0416

The role of magmatic heat sources in the formation of regional and contact metamorphic areas in West Sangilen (Tuva, Russia)

Переведенное название: Роль магматических источников тепла при формировании регионального и контактовых метаморфических ареалов Западного Сангилена (Тува)

O. P. Polyansky, S. A. Kargopolov, A. E. Izokh, A. N. Semenov, A. V. Babichev, A. N. Vasilevsky

Результат исследования: Научные публикации в периодических изданиях › статья › рецензирование

1 Цитирования (Scopus)

Аннотация

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

Переведенное название	Роль магматических источников тепла при формировании регионального и контактовых метаморфических ареалов Западного Сангилена (Тува)
Язык оригинала	английский
Страницы (с-по)	309-323
Число страниц	15
Журнал	Geodynamics and Tectonophysics
Том	10
Номер выпуска	2
DOI	https://doi.org/10.5800/GT-2019-10-2-0416
Состояние	Опубликовано - фев 2019

Доступ к документу

10.5800/GT-2019-10-2-0416

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@article{bb4297eec3d24ff1950355f72abc24fe,

title = "The role of magmatic heat sources in the formation of regional and contact metamorphic areas in West Sangilen (Tuva, Russia)",

abstract = "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 {\textquoteleft}anticline{\textquoteright} 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 {\textquoteleft}closed{\textquoteright} system to fractional melting conditions in {\textquoteleft}open{\textquoteright} 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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author = "Polyansky, {O. P.} and Kargopolov, {S. A.} and Izokh, {A. E.} and Semenov, {A. N.} and Babichev, {A. V.} and Vasilevsky, {A. N.}",

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doi = "10.5800/GT-2019-10-2-0416",

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issn = "2078-502X",

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The role of magmatic heat sources in the formation of regional and contact metamorphic areas in West Sangilen (Tuva, Russia). / Polyansky, O. P.; Kargopolov, S. A.; Izokh, A. E.; Semenov, A. N.; Babichev, A. V.; Vasilevsky, A. N.

В: Geodynamics and Tectonophysics, Том 10, № 2, 02.2019, стр. 309-323.

Результат исследования: Научные публикации в периодических изданиях › статья › рецензирование

TY - JOUR

T1 - The role of magmatic heat sources in the formation of regional and contact metamorphic areas in West Sangilen (Tuva, Russia)

AU - Polyansky, O. P.

AU - Kargopolov, S. A.

AU - Izokh, A. E.

AU - Semenov, A. N.

AU - Babichev, A. V.

AU - Vasilevsky, A. N.

PY - 2019/2

Y1 - 2019/2

N2 - 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).

AB - 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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KW - MANTLE

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KW - zoning

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KW - COMPLEX

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KW - crust

KW - SOUTH-EAST TUVA

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KW - heat transfer

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