Three-dimensional instabilities of mantle convection with multiple phase transitions

Details Three-dimensional instabilities of mantle convection with multiple phase transitions Three-dimensional instabilities of mantle convection with multiple phase transitions

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...259.1308h&link_type=abstract

Science (ISSN 0036-8075), vol. 259, no. 5099, p. 1308-1311.

Physics

116

Convection, Earth Mantle, Phase Transformations, Three Dimensional Models, Boussinesq Approximation, Digital Simulation, Geodynamics, Thermal Expansion

Scientific paper

The effects of multiple phase transitions on mantle convection are investigated by numerical simulations that are based on three-dimensional models. These simulations show that cold sheets of mantle material collide at junctions, merge, and form a strong downflow that is stopped temporarily by the transition zone. The accumulated cold material gives rise to a strong gravitational instability that causes the cold mass to sink rapidly into the lower mantle. This process promotes a massive exchange between the lower and upper mantles and triggers a global instability in the adjacent plume system. This mechanism may be cyclic in nature and may be linked to the generation of superplumes.

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