A Quest for Reference Electrical Conductivity Profile in Continental Upper Mantle through Long Dipole Telluric Observations in Cooperation between Australia and Japan

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We installed the two telluric observation sites, the dipole spans of which are about 1 km, in the central part of Australian Continent in order to elucidate reference electrical conductivity profile in continental upper mantle. The electrical conductivity profile analyzed using the obtained data shows more resistive than the Canadian Shield's result. We also developed a procedure in which electrical conductivity profile could be calculated from arbitral chemical composition among the principal five elements (Ca, Fe, Mg, Al, Si)and from the laboratory experimental data of the mineral conductivity. Standard chemical composition model in continental upper mantle gave more conductive profile than the observed one through the procedure. The result reveals that standard chemical composition and electrical conductivity profile in continental upper mantle is not consistent with each other.