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Phase relations in the system Na 2 CO 3 -CaCO 3  have been studied in the compositional range, X(Na 2 CO 3 ), from 100 to 10 mol%, at 6.0 GPa and 900-1400 °C. Below 1100 °C, the system has three intermediate compounds: Na 4 Ca(CO 3 ) 3 , Na 2 Ca 3 (CO 3 ) 4 , and Na 2 Ca 4 (CO 3 ) 5 . The Na 4 Ca(CO 3 ) 3  and Na 2 Ca 3 (CO 3 ) 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 2 Ca 4 (CO 3 ) 5  compound decomposes to the Na 2 Ca 3 (CO 3 ) 4  + aragonite assembly at 1100 °C. Maximum solid solution of CaCO 3  in Na 2 CO 3  is 6-8 mol% at 1100-1300 °C. Melting of Na 2 CO 3  occurs between 1350 and 1400 °C. Na solubility in aragonite does not exceed the detection limit (&lt;0.5 mol%). Aragonite remains a liquidus phase at 1300 and 1400 °C.

New experimental data on phase relations for the system Na 2 CO 3 -CaCO 3 at 6 GPa and 900–1400 ºC