Core formation, evolution, and convection - A geophysical model

Details Core formation, evolution, and convection - A geophysical model Core formation, evolution, and convection - A geophysical model

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pepi...21..181r&link_type=abstract

(International Union of Geodesy and Geophysics, Symposium on Mathematical Geophysics, 12th, Caracas, Venezuela, Aug. 12-24, 1978

Physics

Geophysics

12

Dynamo Theory, Earth Core, Geophysics, Planetary Evolution, Abundance, Aluminum 26, Convective Flow, Earth Mantle, Geomagnetism, Heat Sources, Radiant Heating, Refractory Materials

Scientific paper

A model for the formation and evolution of the earth's core, which provides an adequate energy source for maintaining the geodynamo, is proposed. A modified inhomogeneous accretion model is proposed which leads to initial iron and refractory enrichment at the center of the planet. The probable heat source for melting of the core is the decay of Al-26. The refractory material is emplaced irregularly in the lowermost mantle with uranium and thorium serving as a long-lived heat source. Fluid motions in the core are driven by the differential heating from above and the resulting cyclonic motions may be the source of the geodynamo.

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