gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2017-8-2-0247gtcrust-368Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSЧИСЛЕННАЯ МОДЕЛЬ МАГМАТИЧЕСКОГО МИНГЛИНГА (НА ПРИМЕРЕ БАЯНКОЛЬСКОЙ ГАББРО‐ГРАНИТНОЙ СЕРИИ, САНГИЛЕН, ТУВА)NUMERICAL SIMULATION OF MAGMA MINGLING (CASE OF BAYANKOL GABBRO‐GRANITE SERIES, SANGILEN, TUVA)ПолянскийО. П.PolyanskyO. P.

докт. геол.-мин. наук, зав. лабораторией,

630090, Новосибирск, просп. Академика Коптюга, 3;

630090, Новосибирск, ул. Пирогова, 2

Doctor of Geology and Mineralogy, Head of Laboratory,

3 Academician Koptyug ave, Novosibirsk 630090;

2 Pirogov street, Novosibirsk 630090

pol@igm.nsc.ruСеменовА. Н.SemenovA. N.

аспирант,

630090, Новосибирск, просп. Академика Коптюга, 3;

630090, Новосибирск, ул. Пирогова, 2

postgraduate student,

3 Academician Koptyug ave, Novosibirsk 630090;

2 Pirogov street, Novosibirsk 630090

semenov@itam.nsc.ruВладимировВ. Г.VladimirovV. G.

канд. геол.-мин. наук, с.н.с.,

630090, Новосибирск, просп. Академика Коптюга, 3;

630090, Новосибирск, ул. Пирогова, 2

Candidate of Geology and Mineralogy, Senior Researcher,

3 Academician Koptyug ave, Novosibirsk 630090;

2 Pirogov street, Novosibirsk 630090

vvg@igm.nsc.ruКармышеваИ. В.KarmyshevaI. V.

канд. геол.-мин. наук, н.с.,

630090, Новосибирск, просп. Академика Коптюга, 3;

630090, Новосибирск, ул. Пирогова, 2

Candidate of Geology and Mineralogy, Researcher,

3 Academician Koptyug ave, Novosibirsk 630090;

2 Pirogov street, Novosibirsk 630090

iri@igm.nsc.ruВладимировА. Г.VladimirovA. G.

докт. геол.-мин. наук, г.н.с., профессор,

630090, Новосибирск, просп. Академика Коптюга, 3;

630090, Новосибирск, ул. Пирогова, 2;

634050, Томск, просп. Ленина, 50

Doctor of Geology and Mineralogy, Chief Researcher, Professor,

3 Academician Koptyug ave, Novosibirsk 630090;

2 Pirogov street, Novosibirsk 630090;

50 Lenin ave, Tomsk 634050

vladimir@igm.nsc.ruЯковлевВ. А.YakovlevV. A.

магистрант, лаборант,

630090, Новосибирск, просп. Академика Коптюга, 3;

630090, Новосибирск, ул. Пирогова, 2

undergraduate student,

3 Academician Koptyug ave, Novosibirsk 630090;

2 Pirogov street, Novosibirsk 630090

yakovlew.official@gmail.comИнститут геологии и минералогии им. В.С. Соболева СО РАН; Новосибирский государственный университетРоссияV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RAS; Novosibirsk State UniversityRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАН; Новосибирский государственный университет; Томский государственный университетРоссияV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RAS; Novosibirsk State University; Tomsk State UniversityRussian Federation20172306201782385403Copyright © Полянский О.П., Семенов А.Н., Владимиров В.Г., Кармышева И.В., Владимиров А.Г., Яковлев В.А., 20172017Полянский О.П., Семенов А.Н., Владимиров В.Г., Кармышева И.В., Владимиров А.Г., Яковлев В.А.Polyansky O.P., Semenov A.N., Vladimirov V.G., Karmysheva I.V., Vladimirov A.G., Yakovlev V.A.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/368

Впервые разработана численная модель, позволяющая описывать процесс формирования дайки комбинированного состава на основе динамики вязкой сжимаемой жидкости, а также численная термомеханическая модель процессов магматического минглинга, учитывающая многофазное взаимодействие разных по составу и свойствам расплавов. На основе моделирования предложен механизм подъема высокоплотных базитовых включений в камере или дайке, заполненной салической магмой, путем гравитационного всплывания во вмещающей гранитной магме, охлажденной и потерявшей летучие компоненты. Выполненное моделирование показывает, что основным параметром, контролирующим форму и размер поднимающихся тел, является разность плотностей. В свою очередь, контрастность вязкости определяет, происходит ли взаимопроникновение и гибридизация магм. Установлено предельное содержание доли кислого материала в смеси, способного транспортировать вверх более плотные базитовые включения. В зависимости от параметров вязкости оценена длительность подъема расплавов в комбинированных дайках, которая составляет около года при характерной скорости 2–3 км/год.

A new numerical model has been developed that makes it possible to describe the process of formation of a dyke of a combined composition on the basis of the dynamics of a viscous compressible fluid. The numerical thermo‐mechanical model shows the processes of magma mingling and taking into account multiphase interaction of melts which are different in composition and properties. The models suggest a mechanism for uplifting of high‐density mafic enclaves in a chamber/dyke filled with salic magma by gravitational floating in the enclosing gran‐ ite magma that has been cooled and lost volatile components. The performed simulation shows that the main parame‐ ter controlling the shape and size of the ascending bodies is the difference in densities. The viscosity contrast determines whether interpenetration and hybridization of magmas occur. The limiting ratio of felsic material in the mix‐ ture, which is capable of uplifting denser mafic enclaves, is estimated. The duration of melt uplifting in combined dykes is estimated with respect to the viscosity parameters. At a typical rate of 2–3 km per year, it amounts to almost 12 months.

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