Инд. авторы:	Shatskiy A., Sharygin I.S., Litasov K.D., Borzdov Y.M., Palyanov Y.N., Ohtani E.
Заглавие:	New experimental data on phase relations for the system Na 2CO3-CaCO3 at 6 GPa and 900-1400 °c
Библ. ссылка:	Shatskiy A., Sharygin I.S., Litasov K.D., Borzdov Y.M., Palyanov Y.N., Ohtani E. New experimental data on phase relations for the system Na 2CO3-CaCO3 at 6 GPa and 900-1400 °c // American Mineralogist. - 2013. - Vol.98. - Iss. 11-12. - P.2164-2171. - ISSN 0003-004X. - EISSN 1945-3027.
Внешние системы:	DOI: 10.2138/am.2013.4436; SCOPUS: 2-s2.0-84888873818; WoS: 000327049100025;
Реферат:	eng: 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.
Ключевые слова:	Earth's mantle; High-pressure; Na-Ca carbonate; Natrocarbonatite; Nnyerereite; Shortite; aragonite; solubility; solid solution; phase equilibrium; mantle structure; high temperature; high pressure; experimental mineralogy; chemical composition; carbonatite; carbonate group; Aragonite; Natrite;
Издано:	2013
Физ. характеристика:	с.2164-2171