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American Mineralogist; January 2006; v. 91; no. 1; p. 211-215; DOI: 10.2138/am.2006.2053
© 2006 Mineralogical Society of America
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Complete solid-solution between Na3Al2(PO4)3 and Mg3Al2(SiO4)3 garnets at high pressure

Fabrice Brunet1,*, Vincent Bonneau1 and Tetsuo Irifune2

1 Laboratoire de Géologie, CNRS-UMR8538, Ecole Normale Supérieure, Paris, France
2 Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan

Correspondence: * E-mail: brunet{at}geologie.ens.fr

Syntheses along the Mg3Al2(SiO4)3-Na3Al2(PO4)3 join were carried out in the 15–17 GPa range at temperatures between 1200 and 1600°C. An Na3Al2(PO4)3 compound of garnet-like structure, with a cubic-cell parameter of 11.579(2) Å, was synthesized and characterized. Intermediate compositions are also found to crystallize in the garnet structure. Between pyrope and Na3Al2(PO4)3, the cubic unit-cell volume increases by 3.1%. In addition, nominal compositions, Mg2.5Na0.5Al2Si2.5P0.5O12 and Mg2Na1Al2Si2P1O12, were run at 3 GPa and 875 °C. They yielded garnet, among other phases, but with no significant phosphorus incorporation as indicated by a pyrope-like unit-cell volume. Phosphorus content in pyrope from the UHP Dora-Maira quartzites appears as a potential pressure indicator where UHP garnet coexists with phosphate minerals. The P-content in upper mantle garnets can be used as a probe of phosphorus activity in the host rock.

Key Words: Crystal synthesis • phosphate garnet • high-pressure studies • garnet • petrography • phosphorus in garnet • XRD data • P-Si garnet solid-solution series




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