Abstract
Three‐dimensional convection for the spinel to perovskite phase change has been simulated numerically. Results for Rayleigh (Ra) numbers of 0(106) 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.
Original language | English (US) |
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Pages (from-to) | 221-224 |
Number of pages | 4 |
Journal | Geophysical Research Letters |
Volume | 20 |
Issue number | 3 |
DOIs | |
State | Published - Feb 5 1993 |