Abstract
In order to investigate the effect of carbonate-content in partial melt on bulk conductivity under high pressure, electrical conductivity measurements were performed on carbonate melt-bearing peridotites using a Kawai-type multi-anvil apparatus. The starting materials were composed of spinel lherzolite (KLB1) with small amounts of dolomite (1 and 3wt.%). To obtain various melt fractions, annealing experiments were performed at different temperatures above 1400K at 3GPa. At low temperatures (≤1500K), the conductivity was distinctly higher than that of carbonate-free peridotite and close to that of the carbonatite melt-bearing olivine aggregates. Although the sample conductivity increased with increasing temperature, the rate at which the conductivity increases was small and the conductivity approached that of silicate melt-bearing peridotite. CO 2 concentration in the partial melt decreased with increasing annealing temperature. Thus, the small increase of the conductivity with annealing temperature is attributed to a decrease of the melt conductivity due to a decrease in carbonate content in the partial melt. As the carbonate concentration in the melt decreases, the estimated melt conductivity approaches that of the basaltic melt. Therefore, conductivity enhancement by the carbonate-bearing melt is very effective at temperature just above that of the carbonate peridotite solidus.
| Original language | English |
|---|---|
| Pages (from-to) | 1-9 |
| Number of pages | 9 |
| Journal | Physics of the Earth and Planetary Interiors |
| Volume | 194-195 |
| DOIs | |
| Publication status | Published - Mar 2012 |
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Keywords
- Carbonatite
- Electrical conductivity
- Melt fraction
- Peridotite
- Upper mantle
ASJC Scopus subject areas
- Geophysics
- Space and Planetary Science
- Physics and Astronomy (miscellaneous)
- Astronomy and Astrophysics
Cite this
Electrical conductivity of partial molten carbonate peridotite. / Yoshino, Takashi; McIsaac, Elizabeth; Laumonier, Mickael; Katsura, Tomoo.
In: Physics of the Earth and Planetary Interiors, Vol. 194-195, 03.2012, p. 1-9.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electrical conductivity of partial molten carbonate peridotite
AU - Yoshino, Takashi
AU - McIsaac, Elizabeth
AU - Laumonier, Mickael
AU - Katsura, Tomoo
PY - 2012/3
Y1 - 2012/3
N2 - In order to investigate the effect of carbonate-content in partial melt on bulk conductivity under high pressure, electrical conductivity measurements were performed on carbonate melt-bearing peridotites using a Kawai-type multi-anvil apparatus. The starting materials were composed of spinel lherzolite (KLB1) with small amounts of dolomite (1 and 3wt.%). To obtain various melt fractions, annealing experiments were performed at different temperatures above 1400K at 3GPa. At low temperatures (≤1500K), the conductivity was distinctly higher than that of carbonate-free peridotite and close to that of the carbonatite melt-bearing olivine aggregates. Although the sample conductivity increased with increasing temperature, the rate at which the conductivity increases was small and the conductivity approached that of silicate melt-bearing peridotite. CO 2 concentration in the partial melt decreased with increasing annealing temperature. Thus, the small increase of the conductivity with annealing temperature is attributed to a decrease of the melt conductivity due to a decrease in carbonate content in the partial melt. As the carbonate concentration in the melt decreases, the estimated melt conductivity approaches that of the basaltic melt. Therefore, conductivity enhancement by the carbonate-bearing melt is very effective at temperature just above that of the carbonate peridotite solidus.
AB - In order to investigate the effect of carbonate-content in partial melt on bulk conductivity under high pressure, electrical conductivity measurements were performed on carbonate melt-bearing peridotites using a Kawai-type multi-anvil apparatus. The starting materials were composed of spinel lherzolite (KLB1) with small amounts of dolomite (1 and 3wt.%). To obtain various melt fractions, annealing experiments were performed at different temperatures above 1400K at 3GPa. At low temperatures (≤1500K), the conductivity was distinctly higher than that of carbonate-free peridotite and close to that of the carbonatite melt-bearing olivine aggregates. Although the sample conductivity increased with increasing temperature, the rate at which the conductivity increases was small and the conductivity approached that of silicate melt-bearing peridotite. CO 2 concentration in the partial melt decreased with increasing annealing temperature. Thus, the small increase of the conductivity with annealing temperature is attributed to a decrease of the melt conductivity due to a decrease in carbonate content in the partial melt. As the carbonate concentration in the melt decreases, the estimated melt conductivity approaches that of the basaltic melt. Therefore, conductivity enhancement by the carbonate-bearing melt is very effective at temperature just above that of the carbonate peridotite solidus.
KW - Carbonatite
KW - Electrical conductivity
KW - Melt fraction
KW - Peridotite
KW - Upper mantle
UR - http://www.scopus.com/inward/record.url?scp=84857024887&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84857024887&partnerID=8YFLogxK
U2 - 10.1016/j.pepi.2012.01.005
DO - 10.1016/j.pepi.2012.01.005
M3 - Article
VL - 194-195
SP - 1
EP - 9
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
SN - 0031-9201
ER -