Article
Article name Temperature distribution in the upper mantle beneath a continent
Authors Kirdyashkin A..
Kirdyashkin A..
Distanov V..
Bibliographic description
Category
DOI 551.2+551.14+536.25
DOI 10.21209/2227-9245-2020-26-1-14-22
Article type
Annotation The upper mantle beneath the continent is represented by three layers: 1) a highly viscous continental lithosphere in which conductive heat transfer is carried out; 2) an asthenospheric layer in which heat transfer occurs under conditions of free convection; 3) layer C (transition zone of the mantle), in which free convective heat transfer also takes place. Based on the available laboratory and theoretical modeling data, the structure of free convective flows in the asthenospheric layer and layer C under the continent is presented. At Rayleigh numbers Ra> 105 in the asthenosphere and layer C, an unsteady large-scale cellular free-convection flow takes place. At heat transfer surfaces (layer boundaries), under conditions of unstable stratification, longitudinal rolls are organized, the axes of which coincide with the direction of flow of large-scale cells. The temperature distribution in the continental lithosphere was found taking into account radiogenic heat release under conditions of conductive heat transfer. Estimates of the kinematic viscosity of the asthenospheric layer and layer C are given. The relationships for determining the adiabatic temperature drops, temperature drops in the thermal boundary layers and conductive sublayers in the asthenosphere and layer C are presented. In addition, relations for the thickness of the roll conduction sublayers at the boundaries of the asthenosphere and layer C are obtained. The values of temperature at the boundaries of the layers, the thickness of the thermal boundary layers, and temperature differences in them are determined. The temperature distribution in the upper mantle in the continental region is presented. Temperature profiles over the thickness of the asthenospheric layer and layer C are constructed on the basis of experimentally determined laws of free-convective heat transfer in a horizontal layer of a viscous fluid, heated from below and cooled from above
Key words upper mantle; asthenosphere; layer C; free-convection flows; convection rolls; phase transition boundary; continental lithosphere; kinematic viscosity; thermal boundary layer; conduction sublayer; temperature profiles
Article information Kirdyashkin A., Kirdyashkin A., Distanov V. Temperature distribution in the upper mantle beneath a continent // Transbaikal State University Journal, 2020, vol. 26, no. 1, pp. 14–22. DOI: 10.21209/2227-9245-2020-26-1-14-22.
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Full articleTemperature distribution in the upper mantle beneath a continent