Article
Article name THERMAL AND HUDRODYNAMIC STRUCTURE AND VOLCANISM IN SUBDUCTION ZONE
Authors Gladkov I.. ,
Kirdyashkin A.A. doctor of geology and mineralogy sciences, aak@igm.nsc.ru;
Kirdyashkin A.G. doctor of technical sciences,
Distanov V.. senior researcher, dist@igm.nsc.ru
Bibliographic description
Category Earth science
DOI 551.2+551/14+536/25
DOI 10.21209/2227-9245-2019-25-9-13-24
Article type scientific
Annotation The process of subduction of oceanic plate is studied as the motion of high-viscosity Newtonian fluid. The subducting plate spreads over 670 km boundary because of oppositely directed horizontal forces. These forces arise as the result of oppositely directed horizontal temperature gradients. The possibility of melting of the crustal layer of submerging plate and formation of thermochemical plume at 670 km boundary has been shown. The model of the thermochemical plume in the subduction zone is proposed. In this connection the authors consider the formation of plume conduit in the crustal layer of submerging plate. The formation conditions of the primary magmatic chamber are presented. The formation of plume conduit melting through the continent is considered. The conditions for plume eruption on the surface have been established. The flow structure of the melt in an inclined plume conduit is studied on the basis of experimental modeling. In the described experiments the plume conduit is formed as a result of an inclined paraffin layer melting above a local heat source. The distinction between mechanisms of melt eruption on the surface is revealed, with and without a gas blanket at the plume roof
Key words Key words: subduction zone; lithospheric plate; thermochemical plume; laboratory modeling; free-convection flows; plume conduit; thermal power; crustal layer; melt; volcanism
Article information Kirdyashkin A., Kirdyashkin A., Gladkov I., Distanov Vol. Thermal and hudrodynamic structure and volcanism in subduction zone // Transbaikal State University Journal, 2019, vol. 25, no. 9, pp. 13-24
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Full articleTHERMAL AND HUDRODYNAMIC STRUCTURE AND VOLCANISM IN SUBDUCTION ZONE