Catastrophic overturn of the earth's mantle driven by multiple phase changes and internal heat generation

Details Catastrophic overturn of the earth's mantle driven by multiple phase changes and internal heat generation Catastrophic overturn of the earth's mantle driven by multiple phase changes and internal heat generation

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..101w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 2, p. 101-104.

Other

63

Earth Mantle, Free Convection, Heat Generation, Incompressible Flow, Phase Transformations, Endothermic Reactions, Exothermic Reactions, Olivine, Perovskites, Spinel

Scientific paper

The effects of phase changes and strong internal heat generation may combine to bring about brief, but extremely intense episodes of rapid thermal convection in the earth's mantle. Numerical calculations using realistic thermodynamic properties for the exothermic olivine spinel and endothermic spinel - perovskite + magnesiowustite phase transitions suggest the transition region of the earth's mantle may act as a capacitor for subducting slabs. Slab material accumulates in the transition region until a threshold level of thermal buoyancy is reached, and is then rapidly discharged into the lower mantle. This occurs as a catastrophic burst of convection lasting about 10 Myr, with elevated heat transfer rates lasting about 100 Myr. The topography on the two phase change boundaries is found to be negatively correlated, with the correlation becoming more negative during periods of rapid convection. Furthermore, the results of this study suggest the transition region of the earth's mantle could be about 250 K cooler on average, and consequently more viscous, than the surrounding mantle.

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