### Abstract

Electrical impedance measurements were performed on two types of partial molten samples with basaltic and carbonatitic melts in a Kawai-type multi-anvil apparatus in order to investigate melt fraction-conductivity relationships and melt distribution of the partial molten mantle peridotite under high pressure. The silicate samples were composed of San Carlos olivine with various amounts of mid-ocean ridge basalt (MORB), and the carbonate samples were a mixture of San Carlos olivine with various amounts of carbonatite. High-pressure experiments on the silicate and carbonate systems were performed up to 1600K at 1.5GPa and up to at least 1650K at 3GPa, respectively. The sample conductivity increased with increasing melt fraction. Carbonatite-bearing samples show approximately one order of magnitude higher conductivity than basalt-bearing ones at the similar melt fraction. A linear relationship between log conductivity (σ_{bulk}) and log melt fraction (Φ) can be expressed well by the Archie's law (Archie, 1942) (σ_{bulk}/σ_{melt}=CΦ^{n}) with parameters C=0.68 and 0.97, n=0.87 and 1.13 for silicate and carbonate systems, respectively. Comparison of the electrical conductivity data with theoretical predictions for melt distribution indicates that the model assuming that the grain boundary is completely wetted by melt is the most preferable melt geometry. The gradual change of conductivity with melt fraction suggests no permeability jump due to melt percolation at a certain melt fraction. The melt fraction of the partial molten region in the upper mantle can be estimated to be 1-3% and ~0.3% for basaltic melt and carbonatite melt, respectively.

Original language | English |
---|---|

Pages (from-to) | 593-602 |

Number of pages | 10 |

Journal | Earth and Planetary Science Letters |

Volume | 295 |

Issue number | 3-4 |

DOIs | |

Publication status | Published - Jul 2010 |

### Fingerprint

### Keywords

- Basalt
- Carbonatite
- Electrical conductivity
- Melt fraction
- Permeability

### ASJC Scopus subject areas

- Geochemistry and Petrology
- Geophysics
- Earth and Planetary Sciences (miscellaneous)
- Space and Planetary Science

### Cite this

*Earth and Planetary Science Letters*,

*295*(3-4), 593-602. https://doi.org/10.1016/j.epsl.2010.04.050

**Electrical conductivity of basaltic and carbonatite melt-bearing peridotites at high pressures : Implications for melt distribution and melt fraction in the upper mantle.** / Yoshino, Takashi; Laumonier, Mickael; McIsaac, Elizabeth; Katsura, Tomoo.

Research output: Contribution to journal › Article

*Earth and Planetary Science Letters*, vol. 295, no. 3-4, pp. 593-602. https://doi.org/10.1016/j.epsl.2010.04.050

}

TY - JOUR

T1 - Electrical conductivity of basaltic and carbonatite melt-bearing peridotites at high pressures

T2 - Implications for melt distribution and melt fraction in the upper mantle

AU - Yoshino, Takashi

AU - Laumonier, Mickael

AU - McIsaac, Elizabeth

AU - Katsura, Tomoo

PY - 2010/7

Y1 - 2010/7

N2 - Electrical impedance measurements were performed on two types of partial molten samples with basaltic and carbonatitic melts in a Kawai-type multi-anvil apparatus in order to investigate melt fraction-conductivity relationships and melt distribution of the partial molten mantle peridotite under high pressure. The silicate samples were composed of San Carlos olivine with various amounts of mid-ocean ridge basalt (MORB), and the carbonate samples were a mixture of San Carlos olivine with various amounts of carbonatite. High-pressure experiments on the silicate and carbonate systems were performed up to 1600K at 1.5GPa and up to at least 1650K at 3GPa, respectively. The sample conductivity increased with increasing melt fraction. Carbonatite-bearing samples show approximately one order of magnitude higher conductivity than basalt-bearing ones at the similar melt fraction. A linear relationship between log conductivity (σbulk) and log melt fraction (Φ) can be expressed well by the Archie's law (Archie, 1942) (σbulk/σmelt=CΦn) with parameters C=0.68 and 0.97, n=0.87 and 1.13 for silicate and carbonate systems, respectively. Comparison of the electrical conductivity data with theoretical predictions for melt distribution indicates that the model assuming that the grain boundary is completely wetted by melt is the most preferable melt geometry. The gradual change of conductivity with melt fraction suggests no permeability jump due to melt percolation at a certain melt fraction. The melt fraction of the partial molten region in the upper mantle can be estimated to be 1-3% and ~0.3% for basaltic melt and carbonatite melt, respectively.

AB - Electrical impedance measurements were performed on two types of partial molten samples with basaltic and carbonatitic melts in a Kawai-type multi-anvil apparatus in order to investigate melt fraction-conductivity relationships and melt distribution of the partial molten mantle peridotite under high pressure. The silicate samples were composed of San Carlos olivine with various amounts of mid-ocean ridge basalt (MORB), and the carbonate samples were a mixture of San Carlos olivine with various amounts of carbonatite. High-pressure experiments on the silicate and carbonate systems were performed up to 1600K at 1.5GPa and up to at least 1650K at 3GPa, respectively. The sample conductivity increased with increasing melt fraction. Carbonatite-bearing samples show approximately one order of magnitude higher conductivity than basalt-bearing ones at the similar melt fraction. A linear relationship between log conductivity (σbulk) and log melt fraction (Φ) can be expressed well by the Archie's law (Archie, 1942) (σbulk/σmelt=CΦn) with parameters C=0.68 and 0.97, n=0.87 and 1.13 for silicate and carbonate systems, respectively. Comparison of the electrical conductivity data with theoretical predictions for melt distribution indicates that the model assuming that the grain boundary is completely wetted by melt is the most preferable melt geometry. The gradual change of conductivity with melt fraction suggests no permeability jump due to melt percolation at a certain melt fraction. The melt fraction of the partial molten region in the upper mantle can be estimated to be 1-3% and ~0.3% for basaltic melt and carbonatite melt, respectively.

KW - Basalt

KW - Carbonatite

KW - Electrical conductivity

KW - Melt fraction

KW - Permeability

UR - http://www.scopus.com/inward/record.url?scp=77953706304&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77953706304&partnerID=8YFLogxK

U2 - 10.1016/j.epsl.2010.04.050

DO - 10.1016/j.epsl.2010.04.050

M3 - Article

AN - SCOPUS:77953706304

VL - 295

SP - 593

EP - 602

JO - Earth and Planetary Sciences Letters

JF - Earth and Planetary Sciences Letters

SN - 0012-821X

IS - 3-4

ER -