Advertisement

Bulletin Volcanologique

, Volume 41, Issue 4, pp 328–332 | Cite as

Electrical conductivity of a spinel lherzolite and a garnet peridotite to 1550°C: relevance to the effects of partial melting

  • M. H. Manghnani
  • C. S. Rai
Chapter I: Physico-chemical Aspect Of Magma Generation

Abstract

Electrical conductivity σ of two ultramafic rocks (a spinel lherzolite and a garnet peridotite) has been investigated to melting temperature at 1 bar under known oxygen fugacity environment. The electrical conductivity of the two rocks is found to increase with degree of partial melting and an ∼ 15% melt fraction is necessary for the electrical conductivity to increase by ∼ 1 order of magnitude. For a given melt fraction electrical conductivity of a spinel lherzolite is lower than that of a garnet peridotite and may be attributed to the differences in the composition of the melts formed.

Keywords

Electrical Conductivity Partial Melting Oxygen Fugacity Ultramafic Rock Garnet Peridotite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Chan, T., Nyland, E. andGough, D. I., 1973,Partial Melting and Conductivity Anomalies in the Upper Mantle. Nature London Phys. Sci.,244, p. 89–90.Google Scholar
  2. Filloux, J. H., 1977,Ocean-floor Magnetotelluric Sounding over North Central pacific. Nature London Phys. Sci.,269, p. 297–301.CrossRefGoogle Scholar
  3. Hermance, J. F. andGrillot, G. R., 1974,Constraints on Temperature Beneath Iceland from Magnetotelluric Data. Phys. Earth Planet. Inter.,8, p. 1–12.CrossRefGoogle Scholar
  4. Honkura, Y., 1975,Partial Melting and Electrical Conductivity Anomalies Beneath the Japan and Philippine Seas. Phys. Earth Planet. Inter.,10, p. 128–134.CrossRefGoogle Scholar
  5. Kushiro, I., Yoder, H. S., Jr., Mysen, B. O., 1976,Viscosities of Basalt and Andesite Melts at High Pressures. J. Geophys. Res.,81, p. 6351–6356.Google Scholar
  6. Larsen, J. C., 1975,Deep Mantle Electrical Conductivity Beneath Hawaii. Geophys. J. Roy. Astron. Soc.,43, p. 17–46.Google Scholar
  7. Murase, T. andMcBirney, A. R., 1973,Properties of Some Common Igneous Rocks and Their Melts at High Temperatures. Geol. Soc. Am. Bull.,84, p. 3563–3592.CrossRefGoogle Scholar
  8. ————— andFujii, T., 1977,Electrical Conductivity of Partially Molten Peridotite. Carnegie Inst. Wash. Yearb.,76, p. 416–419.Google Scholar
  9. Mysen, B. O. andKushiro, I., 1976,Compositional Variation of Coexisting Phases with Degree of Melting of Peridotite under Upper Mantle Conditions. Carnegie Inst. Washington Yearb.,75, p. 546–555.Google Scholar
  10. Nitsan, U., 1974,Stability Field of Olivine with Respect to Oxidation and Reduction. J. Geophys. Res.,79, p. 706–711.Google Scholar
  11. Porath, H. andGough, D. I., 1971,Mantle Conductivity Structures in the Western United States from Magnetometer Array Studies. Geophys. J. Roy. Astron. Soc.,22, p. 261–274.Google Scholar
  12. Presnall, D. C., Simmons, C. L. andPorath, H., 1972,Changes in Electrical Conductivity of a Synthetic Basalt During Melting. J. Geophys Res.,77, p. 5665–5672.Google Scholar
  13. Rai, C. S. andManghnani, M. H., 1976,Electrical Conductivity of Basic and Ultrabasic Rocks as a Function of Temperature to 1500°C (abstr.). EOS Trans. AGU,57, p. 1005.Google Scholar
  14. ----- andManghnani, M. H., 1977,Electrical Conductivity of Basalts to 1500°C. In: Dick, H. J. B. (ed.),Magma Genesis, Proc. of Chapman Conference: Partial Melting in Earth’s Upper Mantle, Oreg. Dept. Geol. Miner. Ind. Bull.96, p. 219–232.Google Scholar
  15. ————— andManghnani, M. H., 1978,Electrical Conductivity of Ultramafic Rocks to 1820 Kelvin. Phys. Earth Planet. Inter.,17, p. 6–13.CrossRefGoogle Scholar
  16. Reay, A. andHarris, P. G., 1964,The Partial Fusion of Peridotite. Bull. Volcan.,27, p. 115–127.Google Scholar
  17. Scarfe, C. M., Paul, D. K. andHarris, P. G., 1972,Melting Experiments at One Atmosphere on Two Ultramafic Nodules. Neues Jahrb. Mineral. Monatsh, H-10, p. 469–476.Google Scholar
  18. Shankland, T. J. andWaff, H. S., 1977,Partial Melting and Electrical Conductivity Anomalies in the Upper Mantle. J. Geophys Res.,33, p. 5409–5417.Google Scholar
  19. Waff, H. S., 1974,Theoretical Considerations of Electrical Conductivity in Partially Molten Mantle and Implications for Geothermometry. J. Geophys. Res.,79, p. 4003–4110.CrossRefGoogle Scholar
  20. —————, 1976,Electrical Conductivity Measurements on Silicate Melts Using the Loop Technique. Rev. Sci. Instrum.,74, p. 877–879.CrossRefGoogle Scholar
  21. Waff, H. S., andBulau, J. R., 1977,Fluid Distribution in Partially Molten « Pyrolite ». EOS Trans. AGU,58, p. 535.Google Scholar
  22. ————— andWeill, D. F., 1975,Electrical Conductivity of Magmatic Liquids: Effects of Temperature, Oxygen Fugacity and Composition. Earth Planet. Sci. Lett.,28, p. 254–260.CrossRefGoogle Scholar
  23. Watanabe, H., 1970,Measurement of Electrical Conductivity of Basalt at Temperatures up to 1500°C and Pressures to about 20 Kilobars. Spec. Contrib. Geophys. Inst., Kyoto Univ.,10, p. 159–170.Google Scholar
  24. Yoder, H. S., 1976,Generation of Basaltic Magma. National Academy of Sciences, Washington, D.C., p. 112–115 and 162–165.Google Scholar

Copyright information

© Intern. Association of Volcanology and Chemistry of the Earth’s Interior 1978

Authors and Affiliations

  • M. H. Manghnani
    • 1
  • C. S. Rai
    • 1
  1. 1.Hawaii Institute of GeophysicsUniversity of HawaiiHonolulu

Personalised recommendations