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Water content in the transition zone from electrical conductivity of wadsleyite and ringwoodite

Abstract

The distribution of water in the Earth's interior reflects the way in which the Earth has evolved, and has an important influence on its material properties. Minerals in the transition zone of the Earth's mantle (from 410 to 660 km depth) have large water solubility1,2,3, and hence it is thought that the transition zone might act as a water reservoir. When the water content of the transition zone exceeds a critical value, upwelling flow might result in partial melting at 410 km, which would affect the distribution of certain elements in the Earth4. However, the amount of water in the transition zone has remained unknown. Here we determined the effects of water and temperature on the electrical conductivity of the minerals wadsleyite and ringwoodite to infer the water content of the transition zone. We find that the electrical conductivity of these minerals depends strongly on water content but only weakly on temperature. By comparing these results with geophysically inferred conductivity5,6,7, we infer that the water content in the mantle transition zone varies regionally, but that its value in the Pacific is estimated to be 0.1–0.2 wt%. These values significantly exceed the estimated critical water content in the upper mantle3,8,9, suggesting that partial melting may indeed occur at 410 km depth, at least in this region.

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Figure 1: Measured electrical conductivity.
Figure 2: The influence of temperature and water content on electrical conductivity.
Figure 3: A comparison of laboratory data on electrical conductivity as a function of water content with the geophysically inferred electrical conductivity in the mantle transition zone in the Pacific5.

References

  1. 1

    Smyth, J. R. β-Mg2SiO4: A potential host for water in the mantle? Am. Mineral. 72, 1051–1055 (1987)

    CAS  Google Scholar 

  2. 2

    Kawamoto, T., Hervig, R. L. & Holloway, J. R. Experimental evidence for a hydrous transition zone in the early Earth's mantle. Earth Planet. Sci. Lett. 142, 587–592 (1996)

    ADS  CAS  Article  Google Scholar 

  3. 3

    Kohlstedt, D. L., Keppler, H. & Rubie, D. C. The solubility of water in α, β and γ phases of (Mg,Fe)2SiO4 . Contrib. Mineral. Petrol. 123, 345–357 (1996)

    ADS  CAS  Article  Google Scholar 

  4. 4

    Bercovici, D. & Karato, S. Whole-mantle convection and the transition-zone water filter. Nature 425, 39–44 (2003)

    ADS  CAS  Article  Google Scholar 

  5. 5

    Utada, H., Koyama, T., Shimizu, H. & Chave, A. D. A semi-global reference model for electrical conductivity in the mid-mantle beneath the north Pacific region. Geophys. Res. Lett. 30, 1194–1198 (2003)

    ADS  Article  Google Scholar 

  6. 6

    Ichiki, M. et al. Upper mantle conductivity structure of the back-arc region beneath northeastern China. Geophys. Res. Lett. 28, 3773–3776 (2001)

    ADS  Article  Google Scholar 

  7. 7

    Tarits, P., Hautot, S. & Perrier, F. Water in the mantle: Results from electrical conductivity beneath the French Alps. Geophys. Res. Lett. 31, L06612, doi:10.1029/2003GL019277 (2004)

    ADS  Article  Google Scholar 

  8. 8

    Bell, D. R. & Rossman, G. R. Water in Earth's mantle—the role of nominally anhydrous minerals. Science 255, 1391–1397 (1992)

    ADS  CAS  Article  Google Scholar 

  9. 9

    Hirth, G. & Kohlstedt, D. L. Water in oceanic upper mantle—implications for rheology, melt extraction and the evolution of lithosphere. Earth Planet. Sci. Lett. 144, 93–108 (1996)

    ADS  CAS  Article  Google Scholar 

  10. 10

    Kushiro, I. et al. Melting of a peridotite nodule at high pressures and high water pressures. J. Geophys. Res. 73, 6023–6029 (1968)

    ADS  CAS  Article  Google Scholar 

  11. 11

    Hirose, K. & Kushiro, I. Partial melting of dry peridotites at high pressures: Determination of compositions of melts segregated from peridotite using aggregates of diamond. Earth Planet. Sci. Lett. 114, 477–489 (1993)

    ADS  CAS  Article  Google Scholar 

  12. 12

    Grove, T. L. et al. Fractional crystallization and mantle melting controls on calc-alkaline differentiation trends. Contrib. Mineral. Petrol. 145, 515–533 (2003)

    ADS  CAS  Article  Google Scholar 

  13. 13

    Karato, S.,, Paterson, M. S. & Fitz Gerald, J. D. Rheology of synthetic olivine aggregates—influence of grain-size and water. J. Geophys. Res. 91, 8151–8176 (1986)

    ADS  CAS  Article  Google Scholar 

  14. 14

    Mei, S. & Kohlstedt, D. L. Influence of water on plastic deformation of olivine aggregates: 1. Diffusion creep regime. J. Geophys. Res. 105, 21457–21469 (2000)

    ADS  CAS  Article  Google Scholar 

  15. 15

    Karato, S. & Jung, H. Effects of pressure on high-temperature dislocation creep in olivine. Phil. Mag. 83, 401–414 (2003)

    ADS  CAS  Article  Google Scholar 

  16. 16

    Karato, S. The role of hydrogen in the electrical conductivity of the upper mantle. Nature 347, 272–273 (1990)

    ADS  CAS  Article  Google Scholar 

  17. 17

    Farver, J. R. & Yund, R. A. Oxygen fugacity in quartz: dependence on temperature and water fugacity. Chem. Geol. 90, 55–70 (1991)

    ADS  CAS  Article  Google Scholar 

  18. 18

    Karato, S. in Inside the Subduction Factory (ed. Eiler, J.) 138–152 (Am. Geophys. Union, Washington DC, 2003)

    Google Scholar 

  19. 19

    Paterson, M. S. The determination of hydroxyl by infrared absorption in quartz, silicate glasses and similar materials. Bull. Mineral. 105, 20–29 (1982)

    CAS  Google Scholar 

  20. 20

    Xu, Y., Poe, B. T., Shankland, T. J. & Rubie, D. C. Electrical conductivity of olivine, wadsleyite, and ringwoodite under upper-mantle conditions. Science 280, 1415–1418 (1998)

    ADS  CAS  Article  Google Scholar 

  21. 21

    Wood, B. J., Bryndzia, L. T. & Johnson, K. E. Mantle oxidation state and its relationship to tectonic environment and fluid speciation. Science 248, 337–345 (1990)

    ADS  CAS  Article  Google Scholar 

  22. 22

    Xu, Y., Shankland, T. J. & Duba, A. G. Pressure effect on electrical conductivity of mantle olivine. Phys. Earth Planet. Inter. 118, 149–161 (2000)

    ADS  CAS  Article  Google Scholar 

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Acknowledgements

Z. Jiang and Y. Nishihara provided the technical assistance that made this research possible. This work was supported by the NSF of China and the NSF of the United States.Authors' contributions S.-I.K. supervised the whole project. The experimental measurements of electrical conductivity were made by X.H. in collaboration with Y.X., and the theoretical interpretation of the results and the geophysical applications were made by S.-I.K. together with Y.X.

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Correspondence to Shun-ichiro Karato.

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Huang, X., Xu, Y. & Karato, Si. Water content in the transition zone from electrical conductivity of wadsleyite and ringwoodite. Nature 434, 746–749 (2005). https://doi.org/10.1038/nature03426

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