Three-dimensional mantle dynamics with an endothermic phase transition

Details Three-dimensional mantle dynamics with an endothermic phase transition Three-dimensional mantle dynamics with an endothermic phase transition

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..221h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 3, p. 221-224.

Physics

24

Digital Simulation, Earth Mantle, Perovskites, Phase Transformations, Plumes, Spinel, Crank-Nicholson Method, Rayleigh Number, Runge-Kutta Method

Scientific paper

3D convection for the spinel to perovskite phase change has been simulated numerically. Results for Rayleigh (Ra) numbers of 0(10 exp 6) show intermittent layering with a strong robust plume rising through the phase boundary. Many descending instabilities are deflected but merging cold sheets come together at a junction. A pool of cold material accumulates underneath in the phase-transition zone. A strong gravitational instability results, which precipitates a rapid and massive discharge of upper-mantle material.

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