Effect of mantle plumes on the growth of the D double-prime region by reaction between the core and mantle

Physics

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Chemical Reactions, Earth Core, Earth Mantle, Geophysical Fluids, Iron, Silicates, Convective Heat Transfer, Finite Element Method, Liquid Metals, Thermal Boundary Layer

Scientific paper

The core-mantle boundary is a fundamental compositional discontinuity in the Earth where heat flow creates a thermal boundary layer and chemical reactions may create a layer of different composition and density from the mantle. A finite element model of convection in a spherical shell was used to investigate the formation of layers at the base of the mantle. Layer development depends on the composition of material forming at the boundary and the rate of diffusion into the mantle. Convective mixing creates a layer intermediate in composition and density between the reaction products and the mantle and the varying thickness and composition of the layer is consistent with geophysical observations of the characteristics of the deep mantle.

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