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Plessite formation by discontinuous precipitation reaction from γ-Fe,Ni in Richardton (H5) ordinary chondrite

Nature volume 301, pages 322324 (27 January 1983) | Download Citation

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Abstract

Discontinuous precipitation reactions involve the growth of stable phases behind a grain boundary migrating into a supersaturated solid-solution1, and have been synthesized in Fe,Ni alloys at temperatures 500 °C (ref. 2). Axon and Grokhovsky3 have recently described localized, low temperature (350–400 °C) discontinuous precipitation reactions of the type α→[α + γ] (ref. 2) occurring naturally in initially slowly cooled α-Fe,Ni (kamacite) in the Richardton H-group ordinary chondrite. In this further study of the same meteorite we describe a complementary discontinuous precipitation reaction in zoned γ-Fe,Ni (taenite) which has produced plessite (α+ γ-Fe,Ni). Microscopic discontinuous precipitation reactions in Richardton metal occurred at lower temperatures (350 °C) and, in the case of zoned γ-taenite, at higher Ni contents than those synthesized in the laboratory2. We suggest that discontinuous precipitation may be an important mechanism for the production of plessite in strained then annealed, or shock reheated, meteorites.

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References

  1. 1.

    & Int. Metal. Rev. 26, 153–183 (1981).

  2. 2.

    & Arch. Eisenhütt. 43, 657–663 (1972).

  3. 3.

    & Nature 296, 835–837 (1982).

  4. 4.

    & Geochim. cosmochim. Acta 29, 893–920 (1965).

  5. 5.

    & Naturwissenschaften 60, 313–321 (1973).

  6. 6.

    Icarus 3, 429–459 (1964).

  7. 7.

    Icarus 6, 1–49 (1967).

  8. 8.

    , & Geochim. cosmochim. Acta 30, 649–662 (1966).

  9. 9.

    , & Geochim. cosmochim. Acta 43, 725–737 (1979).

  10. 10.

    Acta Polytechn. Scand. 51, 1–46 (1966).

  11. 11.

    Geochim. cosmochim. Acta 37, 2283–2294 (1973).

  12. 12.

    & Geochim. cosmochim. Acta 45, 1187–1197 (1981).

  13. 13.

    Handbook of Iron Meteorites (University of California Press, Berkeley, 1975).

  14. 14.

    , , & Geochim. cosmochim. Acta (in the press).

  15. 15.

    & Geochim. cosmochim. Acta 34, 677–687 (1970).

  16. 16.

    & J. geophys. Res. 76, 1879–1893 (1971).

  17. 17.

    & Geochim. cosmochim. Acta 40, 177–189 (1976).

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Author information

Affiliations

  1. Physico-Technical Department, Urals Polytechnical Institute, Sverdlovsk 620002, USSR

    • V. J. Grokhovsky
  2. Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BD, UK

    • A. W. R. Bevan

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DOI

https://doi.org/10.1038/301322a0

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