Инд. авторы:	Tychkov S.A., Chervov V.V., Chernykh G.G.
Заглавие:	A numerical model of three-dimensional convection in the upper mantle
Библ. ссылка:	Tychkov S.A., Chervov V.V., Chernykh G.G. A numerical model of three-dimensional convection in the upper mantle // Izvestiya. Physics of the Solid Earth. - 2005. - Vol.41. - Iss. 5. - P.383-398. - ISSN 1069-3513. - EISSN 1531-8451.
Внешние системы:	РИНЦ: 13497362; SCOPUS: 2-s2.0-20444461553; WoS: 000229364000005;
Реферат:	eng: Results of 3-D modeling of thermal convection in the upper mantle with viscosity depending on temperature and pressure are presented. The numerical model is realized in the vorticity-vector potential variables. Testing with the use of the model developed by Busse et al. [1993] yielded an error of no more than 1-3%. Model results are obtained for thermal convection beneath a lithosphere of variable thickness. The modeling of convection beneath a plate of variable thickness represented by a long band showed that the structure of convective flows is essentially three-dimensional and, therefore, the application of two-dimensional modeling to the investigation of mantle dynamics even beneath extended structures can hardly be justified. The main result of the three-dimensional modeling of thermal convection beneath a thick craton is the determination of spatial characteristics of a small-scale convection mode immediately under the lithosphere in the "asthenospheric" interval depths (200350 km). The small-scale convection exists in the form of elongated cells of a lateral size of 500 kin between ascending and descending convective flows. This mode develops on the periphery of a thickened region of the lithosphere and can account for the properties of trap magmatism in ancient cratons and their peripheral parts.
Издано:	2005
Физ. характеристика:	с.383-398