Инд. авторы:	Semenov A.N., Polyansky O.P.
Заглавие:	Numerical modeling of the mechanisms of magma mingling and mixing: A case study of the formation of complex intrusions
Библ. ссылка:	Semenov A.N., Polyansky O.P. Numerical modeling of the mechanisms of magma mingling and mixing: A case study of the formation of complex intrusions // Russian Geology and Geophysics. - 2017. - Vol.58. - Iss. 11. - P.1317-1332. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2017.11.001; РИНЦ: 32874019; РИНЦ: 32874019; WoS: 000417043100004;
Реферат:	eng: This paper describes a thermomechanical mathematical model of magma mingling and mixing during the formation of complex intrusions and presents the first results of numerical modeling. The model considers one-pulse intrusion of mafic or intermediate melts into a granitoid magma chamber. The model is based on literature data on the composition and structure of two polychronous intrusions: the Burgas quartz syenite massif and the Magadan granitoid batholith. The modeling shows that the main parameter controlling the convection regime is the density difference. The density and viscosity contrasts of interacting magmas during mingling and mixing are estimated. Depending on the density difference, one of the possible processes dominates: In the case of a small difference (less than 30-40 kg/m(3)), magma mixing and hybridization in a small contact zone takes place; in the case of a large difference (100 kg/m(3) or more), magma mingling predominates. The viscosity contrast, in turn, determines whether interpenetration of melts or fragmentation of melts in the form of drops, spheres, etc. occurs. There is a limiting viscosity of salic magma (108 Pa.s) at which the flows freeze in the chamber and further cooling occurs with a slowly moving fluid. The time of formation of mingling structures is estimated to be several days to several hundred years, depending on the initial melt viscosity. (C) 2017, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.
Ключевые слова:	CHAMBERS; EVOLUTION; CONSTRAINTS; TUVA; DYNAMICS; SANGILEN; GRANITIC MAGMAS; CONTINENTAL-CRUST; THERMODYNAMIC MODEL; dike; intrusion; numerical modeling; crystallization; viscosity; melt; convection; mixing; magma mingling; SYSTEM;
Издано:	2017
Физ. характеристика:	с.1317-1332