Low frequency electrical response of polycrystalline olivine compacts: grain boundary transport

James Tyburczy, J. J. Roberts

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The complex electrical impedance of sintered, polycrystalline compacts of San Carlos olivine has been determined over the frequency range 104 to 10-4 Hz, at temperatures between 800 and 1400°C, at the fO2 of the wustite-magnetite buffer. Grain interior transport controls the response above ~102 Hz, whereas grain boundary transport dominates between ~102 and 10-2 Hz. Bulk DC conductivity is lower than either grain interior or grain boundary conductivity alone. Inversion of magnetotelluric profiles that employ lower bulk conductivities of the grain interior-grain boundary system yield upper mantle temperature estimates 30 to 50°C higher than those based on single crystal values. -from Authors

Original languageEnglish (US)
Pages (from-to)1985-1988
Number of pages4
JournalGeophysical Research Letters
Volume17
Issue number11
StatePublished - 1990

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grain boundary
olivine
conductivity
grain boundaries
low frequencies
low conductivity
electrical impedance
magnetite
upper mantle
Earth mantle
buffers
frequency ranges
temperature
direct current
crystal
inversions
single crystals
estimates
profiles

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Low frequency electrical response of polycrystalline olivine compacts : grain boundary transport. / Tyburczy, James; Roberts, J. J.

In: Geophysical Research Letters, Vol. 17, No. 11, 1990, p. 1985-1988.

Research output: Contribution to journalArticle

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AB - The complex electrical impedance of sintered, polycrystalline compacts of San Carlos olivine has been determined over the frequency range 104 to 10-4 Hz, at temperatures between 800 and 1400°C, at the fO2 of the wustite-magnetite buffer. Grain interior transport controls the response above ~102 Hz, whereas grain boundary transport dominates between ~102 and 10-2 Hz. Bulk DC conductivity is lower than either grain interior or grain boundary conductivity alone. Inversion of magnetotelluric profiles that employ lower bulk conductivities of the grain interior-grain boundary system yield upper mantle temperature estimates 30 to 50°C higher than those based on single crystal values. -from Authors

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