Coupling between grain growth and mantle convection: Implications for thermal and chemical evolution of the Earth

Details Coupling between grain growth and mantle convection: Implications for thermal and chemical evolution of the Earth Coupling between grain growth and mantle convection: Implications for thermal and chemical evolution of the Earth

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.v52b..03s&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #V52B-03

Physics

8121 Dynamics, Convection Currents And Mantle Plumes, 8125 Evolution Of The Earth, 8147 Planetary Interiors (5430, 5724), 8162 Rheology: Mantle, 1010 Chemical Evolution

Scientific paper

The lack of anisotropy in the lower mantle of the Earth suggests that deformation is controlled by diffusion creep or superplasticity. This implies that the viscosity depends on the grain size. Analysis of various kinetic processes in the Earth' mantle suggests that the grain size is mainly controlled by Ostwald ripening of Mg-perovskite, Ca-perovskite and magnesiowustite. Coupling between Ostwald ripening, viscosity and convection strongly affects thermal and chemical evolution of the Earth. Depending on the grain growth parameters, the Earth can either quickly forget the initial conditions with temperature and heat loss following the decaying radiogenic heat production (Tozer-type evolution) or the initial conditions can essentially determine the temperature and heat loss (Christensen-type evolution). Grain size-induced spatial variations in the viscosity can cause stagnation and poor chemical mixing in older regions of the lower mantle. This is a possible physical mechanism of preservation of blobs of undepleted material in the lower mantle.

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