Instabilities from phase transitions and the timescales of mantle thermal evolution

Details Instabilities from phase transitions and the timescales of mantle thermal evolution Instabilities from phase transitions and the timescales of mantle thermal evolution

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1119s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 12, p. 1119-1122.

Physics

52

Earth Mantle, Phase Stability (Materials), Phase Transformations, Planetary Evolution, Thermal Stability, Mathematical Models, Rayleigh Number, Temperature Dependence

Scientific paper

We have investigated the effects of mantle phase transitions on the Earth's thermal evolution by numerical modelling. Our results show that the tendency of layering grows with increasing vigor of convection. A self-consistent model which couples the convective dynamics of the mantle to the secular cooling of the core is constructed. For a temperature-dependent effective viscosity, we found that the thermal history of the Earth is characterized by two timescales, one is associated with layered convection in the early period, which is followed by a transition period with dramatic overturns. As the Rayleigh number decreases sufficiently low, whole mantle convection prevails and a faster cooling timescale ensues.

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