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Complete solid-solution between Na₃Al₂(PO₄)₃ and Mg₃Al₂(SiO₄)₃ garnets at high pressure

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, Mg_2.5Na_0.5Al₂Si_2.5P_0.5O₁₂ 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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