Electrical conductivity of mantle peridotite at the uppermost lower mantle condition

T. Yoshino, T. Katsura, D. Yamazaki, E. Ito

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Abstract

Electrical conductivity of mantle peridotite was measured at 25 GPa and temperature up to 1800 K in a Kawai-type multi-anvil apparatus. The starting material was gel with a composition of fertile spinel lherzolite (KLB1). After the conductivity measurement, mineral phases of run products are composed of magnesium silicate perovskite, ferro-periclase and Ca perovskite. The conductivity value of the peridotite is distinctly higher than those of post-spinel and magnesian silicate perovskite with a composition of (Mg 0.9,Fe0.1)SiO3, but lower than that of ferro-periclase. Both absolute values and change in activation enthalpy for the conductivity of the mantle peridotite are similar to those for the silicate perovskite. A presence of aluminous perovskite with substantial amount of ferric iron in crystal structure would enhance bulk conductivity of the lower mantle.

Original languageEnglish
Article number012102
JournalJournal of Physics: Conference Series
Volume215
DOIs
Publication statusPublished - May 12 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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