| Инд. авторы: | Shatskiy A.F., Rashchenko S.V., Ohtani E., Litasov K.D., Khlestov M.V., Borzdov Y.M., Kupriyanov I.N., Sharygin I.S., Palyanov Y.N. |
| Заглавие: | The system Na2CO3-FeCO3 at 6 GPa and its relation to the system Na2CO3-FeCO3-MgCO3 |
| Библ. ссылка: | Shatskiy A.F., Rashchenko S.V., Ohtani E., Litasov K.D., Khlestov M.V., Borzdov Y.M., Kupriyanov I.N., Sharygin I.S., Palyanov Y.N. The system Na2CO3-FeCO3 at 6 GPa and its relation to the system Na2CO3-FeCO3-MgCO3 // American Mineralogist. - 2015. - Vol.100. - Iss. 1. - P.130-137. - ISSN 0003-004X. - EISSN 1945-3027. |
| Внешние системы: | DOI: 10.2138/am-2015-4777; SCOPUS: 2-s2.0-84921325854; WoS: 000347436600015; |
| Реферат: | eng: 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 degrees 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 R (3) over bar eitelite structure with cell parameters a=4.9712(16), c=16.569(4) angstrom, V=354.61(22). The Na2CO3-Na2Fe(CO3)(2) eutectic is established at 1000 degrees C and 66 mol% Na2CO3. Na2Fe(CO3)(2) disappears between 1000 and 1100 degrees C via incongruent melting to siderite and a liquid containing about 55 mol% Na2CO3. Siderite remains a subliquidus phase at 1400 degrees 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 Na-2(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.
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| Ключевые слова: | CARBON-DIOXIDE; FIBROUS DIAMONDS; MINERAL INCLUSIONS; UDACHNAYA KIMBERLITE; DEGREES-C; UPPER-MANTLE; KIMBERLITE PIPE; HIGH-PRESSURE; DEEP MANTLE; melting; mantle; phase relations; carbonatite; high-pressure experiment; eitelite; siderite; Natrite; SUBSOLIDUS PHASE-RELATIONS; |
| Издано: | 2015 |
| Физ. характеристика: | с.130-137 |