Physics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14.1075l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, Nov. 1987, p. 1075-1078. NASA-NSF-supported research.
Physics
48
Earth Mantle, Electrical Measurement, Electrical Resistivity, Geoelectricity, Perovskites, Iron Compounds, Magnesium Compounds, Silicates
Scientific paper
Electrical conductivity measurements of Perovskite and a Perovskite-dominated assemblage synthesized from pyroxene and olivine demonstrate that these high-pressure phases are insulating to pressures of 82 GPa and temperatures of 4500 K. Assuming an anhydrous upper mantle composition, the result provides an upper bound of 0.01 S/m for the electrical conductivity of the lower mantle between depths of 700 and 1900 km. This is 2 to 4 orders of magnitude lower than previous estimates of lower-mantle conductivity derived from studies of geomagnetic secular variations.
Jeanloz Raymond
Li Xiao-yuan
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