The system Na2CO3-FeCO3at 6 GPa and its relation to the system Na2CO3-FeCO3-MgCO3

Anton Shatskiy, Sergey V. Rashchenko, Eiji Ohtani, Konstantin D. Litasov, Mikhail V. Khlestov, Yuri M. Borzdov, Igor N. Kupriyanov, Igor S. Sharygin, Yuri N. Palyanov

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11 Citations (Scopus)

Abstract

The phase relations in the Na2CO3-(Fe0.87Mn0.06Mg0.07)CO3 system have been studied in Kawai-type multi-anvil experiments using graphite capsules at 6.0 GPa and 900-1400 °C. Subsolidus assemblages comprise the stability fields of Na2CO3 + Na2Fe(CO3)2 and Na2Fe(CO3)2 + siderite with the transition boundary at X(Na2CO3) = 50 mol%. Intermediate Na2Fe(CO3)2 compound has rhombohedral R3 eitelite structure with cell parameters a = 4.9712(16), c = 16.569(4) A˚, V = 354.61(22). The Na2CO3- Na2Fe(CO3)2 eutectic is established at 1000 °C and 66 mol% Na2CO3· Na2Fe(CO3)2 disappears between 1000 and 1100 °C via incongruent melting to siderite and a liquid containing about 55 mol% Na2CO3. Siderite remains a subliquidus phase at 1400 °C at X(Na2CO3) ≤ 30 mol%. The ternary Na2CO3-FeCO3-MgCO3 system can be built up from the corresponding binary systems: two systems with intermediate Na2(Mg, Fe)(CO3)2 phase, which melts congruently at the Mg-rich side and incongruently at the Fe-rich side, and the (Mg, Fe)CO3 system with complete solid solution. The phase relations suggest that the maximum contribution of FeCO3 component into the lowering solidus temperatures of Na-bearing carbonated mantle domains could not exceed several tens of degrees Celsius.

Original languageEnglish
Pages (from-to)130-137
Number of pages8
JournalAmerican Mineralogist
Volume100
Issue number1
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • Carbonatite
  • Eitelite
  • High-pressure experiment
  • Mantle
  • Melting
  • Natrite
  • Phase relations
  • Siderite

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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    Shatskiy, A., Rashchenko, S. V., Ohtani, E., Litasov, K. D., Khlestov, M. V., Borzdov, Y. M., Kupriyanov, I. N., Sharygin, I. S., & Palyanov, Y. N. (2015). The system Na2CO3-FeCO3at 6 GPa and its relation to the system Na2CO3-FeCO3-MgCO3. American Mineralogist, 100(1), 130-137. https://doi.org/10.2138/am-2015-4777