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Earth science

Another energy source for the geodynamo

Magnesium is not usually considered to be a constituent of Earth's core, but its presence there has now been proposed to explain an ongoing enigma — the identity of the energy sources that drive our planet's magnetic field. See Letter p.387

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Figure 1: Possible processes at the boundary between Earth's liquid core and rocky mantle.


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  1. Nimmo, F. in Treatise on Geophysics 2nd edn (ed. Schubert, G.) 31–55 (Elsevier, 2015).

    Google Scholar 

  2. Pozzo, M., Davies, C., Gubbins, D. & Alfè, D. Nature 485, 355–358 (2012).

    ADS  CAS  Article  Google Scholar 

  3. Gomi, H. & Hirose, K. Phys. Earth Planet. Inter. 247, 2–10 (2015).

    ADS  CAS  Article  Google Scholar 

  4. O'Rourke, J. G. & Stevenson, D. J. Nature 529, 387–389 (2016).

    ADS  CAS  Article  Google Scholar 

  5. Tarduno, J. A. et al. Science 327, 1238–1240 (2010).

    ADS  CAS  Article  Google Scholar 

  6. Badro, J., Côté, A. S. & Brodholt, J. P. Proc. Natl Acad. Sci. USA 111, 7542–7545 (2014).

    ADS  CAS  Article  Google Scholar 

  7. Wahl, S. M. & Militzer, B. Earth Planet. Sci. Lett. 410, 25–33 (2015).

    ADS  CAS  Article  Google Scholar 

  8. Takafuji, N., Hirose, K., Mitome, M. & Bando, Y. Geophys. Res. Lett. 32, L06313 (2005).

    ADS  Article  Google Scholar 

  9. Fischer, R. A. et al. Geochim. Cosmochim. Acta 167, 177–194 (2015).

    ADS  CAS  Article  Google Scholar 

  10. Buffett, B. A., Garnero, E. J. & Jeanloz, R. Science 290, 1338–1342 (2000).

    ADS  CAS  Article  Google Scholar 

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Correspondence to Bruce Buffett.

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Buffett, B. Another energy source for the geodynamo. Nature 529, 288–289 (2016).

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