Discovery of a NaPx-En inclusion in diamond: possible trasition zone origin

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Author(s)

Abstract

A mineral inclusion, which has a composition of 16 mole % NaPx (Na<SUB>2</SUB>MgSi<SUB>5</SUB>O<SUB>12</SUB>) and 84 mole % enstatite (Mg<SUB>4</SUB>Si<SUB>4</SUB>O<SUB>12</SUB>), was found in a diamond specimen from the “No. 50” kimberlite pipe in the Province of Liaoning, China. This inclusion contains a significant amount of Na<SUB>2</SUB>O, and part of the silicon may be six-coordinated by oxygen. It appears to have formed at a pressure of at least 16.5 GPa, on the basis of existing high-pressure experimental results, and suggests a new phase derived from the transition zone (410–670 km). Combined with previous reports on rock samples from the transition zone, our discovery of the NaPx–En inclusion supports the proposal that the transition zone is mineralogically and geochemically heterogeneous.

Journal

  • Mineralogical Journal

    Mineralogical Journal 18(1), 9-16, 1996-01-01

    Japan Association of Mineralogical Sciences

References:  20

Codes

  • NII Article ID (NAID)
    10008772599
  • NII NACSIS-CAT ID (NCID)
    AA00739590
  • Text Lang
    ENG
  • Article Type
    SHO
  • ISSN
    05442540
  • Data Source
    CJP  J-STAGE 
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