Abstract
The complex impedance of a polycrystalline sample of San Carlos olivine including 5 vol% of a synthetic silicate glass containing sodium, magnesium, and iron has been measured as a function of temperature under controlled oxygen fugacity at a.c. frequencies of 10², 10³, and 104 Hz. Below ∼800°C, the conductivity of the sample is at least 5 to 10 times higher than that of single crystal and polycrystalline San Carlos olivine, respectively, and has an activation energy half that of the single crystal. The sample conductivity increases dramatically as a function of the measurement frequency. Hysteresis and time‐dependent changes in sample conductivity are observed above the liquidus of the glass (∼900°C). The data suggest that the electrical conductivity of partially molten samples is characterized by parallel conduction of the solid and melt phases and is a sensitive indicator of melt distribution as well as the kinetics of melt re‐equilibration.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2107-2110 |
| Number of pages | 4 |
| Journal | Geophysical Research Letters |
| Volume | 20 |
| Issue number | 19 |
| DOIs | |
| State | Published - Oct 8 1993 |