Density differentiation on the core-mantle interface and gravity convection

Details Density differentiation on the core-mantle interface and gravity convection Density differentiation on the core-mantle interface and gravity convection

Dec 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969pepi....2..318a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 2, Issue 5, p. 318-325.

Physics

7

Scientific paper

Differentiation of the primitive matter of the Earth by segregation of substances of different densities is considered. In association with radioactive heating, density differentiation of the lower mantle matter may occur on the core-mantle interface. This results in a separation of the core substance and an accumulation of lighter substances at the base of the mantle. This light material passes through the lower mantle and enters the upper layers of the Earth. Uplift of the light material in the gravity field gives rise to a convective motion which is called gravity convection in the mantle. Due to the density differentiation of the lower mantle matter and gravity convection, the core and the upper mantle grow at the expense of the lower mantle. A possible distribution of convective motions and the consequences of gravity convection are discussed for the cases of a silicate core and of a core consisting mainly of iron.

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