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 language | English (US) |
|---|---|
| Pages (from-to) | 1985-1988 |
| Number of pages | 4 |
| Journal | Geophysical Research Letters |
| Volume | 17 |
| Issue number | 11 |
| State | Published - 1990 |
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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 journal › Article
}
TY - JOUR
T1 - Low frequency electrical response of polycrystalline olivine compacts
T2 - grain boundary transport
AU - Tyburczy, James
AU - Roberts, J. J.
PY - 1990
Y1 - 1990
N2 - 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
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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M3 - Article
AN - SCOPUS:0025683929
VL - 17
SP - 1985
EP - 1988
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 11
ER -