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Olivine–Spinel Transition on Nickel Orthosilicate

Naturevolume 187page1019 (1960) | Download Citation



THE pressure-induced transition of olivine to a denser spinel structure is probably of considerable importance in the Earth's mantle1. Olivine–spinel transitions are known in Mg2GeO4 (refs. 2 and 3) and Fe2SiO4 (ref. 1), while a variety of evidence indicates that Mg2SiO4 will undergo a similar transition around 125,000 atmospheres and 600° C. (refs. 1 and 3). These results suggested the desirability of exploring for olivine–spinel transitions in other substances which normally crystallize with an olivine structure.

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  1. 1

    Ringwood, A. E., Geochim. et Cosmochim. Acta, 13, 303 ; 15, 18, 195 (1958).

  2. 2

    Goldschmidt, V. M., Nachr. Ges. Wiss. Göttingen, 1, 184 (1931).

  3. 3

    Dachille, F., and Roy, R., Amer. J. Sci., 258, 225 (1960).

  4. 4

    Wentorf, R. H., Nature, 183, 1617 (1959).

  5. 5

    Bovenkerk, H. P., Bundy, F. P., Hall, H. T., and Wentorf, R. H., Nature, 184, 1094 (1959).

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  1. Department of Geophysics, Australian National University, Canberra

    • A. E. RINGWOOD


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