Melting instabilities in the transition zone

Details Melting instabilities in the transition zone Melting instabilities in the transition zone

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.127...67s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 127, no. 1-4, p. 67-75

Mathematics

13

Earth Mantle, Geochemistry, Geochronology, Hot Surfaces, Melts (Crystal Growth), Thermal Stability, Viscosity, Water Heating, Zone Melting, Feedback, Heat Transfer, Mathematical Models, Nonlinearity, Perovskites, Temperature Dependence, Temperature Gradients

Scientific paper

Melting in the transition zone could result from the rapid passage of hot upwelling through the perovskite-spinel phase transition. A large temperature increase could be produced above the perovskite to spinel transition by both viscous heating and a nonlinear positive feedback between temperature-dependent viscosity and latent heat release. The rise times for these instabilities have been estimated to be about 10 Ma. These instabilities were triggered by the episodic downwelling instabilities, which preceded the flush of cold material in layered mantle convection with phase transitions. These results would suggest that melting in the transition zone would have had a greater tendency to occur in the past and might have caused the generation of komatiites in the Archean.

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