Abstract
Analysis of the geomagnetic variations shows that in the Earth’s mantle at a depth of 700 km there is a rapid rise of electrical conductivity. Other considerations show that this rise flattens off in the lower mantle. The phenomenon is well explained by the semi-conduction of the silicate minerals. Experimental results on the electrical conductivity of olivine with temperature and pressures up to those of the Moon’s centre will be described. Different models of the temperature distribution yield widely varying conductivity distributions.
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