New experimental data on phase relations for the system Na 2CO3-CaCO3 at 6 GPa and 900-1400 °c

Anton Shatskiy, Igor S. Sharygin, Konstantin D. Litasov, Yuri M. Borzdov, Yuri N. Palyanov, Eiji Ohtani

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26 Citations (Scopus)


Phase relations in the system Na2CO3-CaCO3 have been studied in the compositional range, X(Na2CO3), from 100 to 10 mol%, at 6.0 GPa and 900-1400 °C. Below 1100 °C, the system has three intermediate compounds: Na4Ca(CO3) 3, Na2Ca3(CO3)4, and Na2Ca4(CO3)5. The Na 4Ca(CO3)3 and Na2Ca 3(CO3)4 compounds melt congruently slightly above 1200 and 1300 °C, respectively. The eutectics were established at 70 and 52 mol% near 1200 °C and at 21 mol% near 1300 °C. The Na 2Ca4(CO3)5 compound decomposes to the Na2Ca3(CO3)4 + aragonite assembly at 1100 °C. Maximum solid solution of CaCO3 in Na 2CO3 is 6-8 mol% at 1100-1300 °C. Melting of Na 2CO3 occurs between 1350 and 1400 °C. Na solubility in aragonite does not exceed the detection limit (<0.5 mol%). Aragonite remains a liquidus phase at 1300 and 1400 °C.

Original languageEnglish
Pages (from-to)2164-2171
Number of pages8
JournalAmerican Mineralogist
Issue number11-12
Publication statusPublished - 2013
Externally publishedYes


  • Aragonite
  • Earth's mantle
  • High-pressure
  • Na-Ca carbonate
  • Natrite
  • Natrocarbonatite
  • Nnyerereite
  • Shortite

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology


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