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

doi:10.2138/am-2015-4777

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

SCI - Earth Science

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

The phase relations in the Na₂CO₃-(Fe_0.87Mn_0.06Mg_0.07)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 language	English
Pages (from-to)	130-137
Number of pages	8
Journal	American Mineralogist
Volume	100
Issue number	1
DOIs	https://doi.org/10.2138/am-2015-4777
Publication status	Published - 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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The system Na₂CO₃-FeCO₃at 6 GPa and its relation to the system Na₂CO₃-FeCO₃-MgCO₃. / Shatskiy, Anton; Rashchenko, Sergey V.; Ohtani, Eiji; Litasov, Konstantin D.; Khlestov, Mikhail V.; Borzdov, Yuri M.; Kupriyanov, Igor N.; Sharygin, Igor S.; Palyanov, Yuri N.

In: American Mineralogist, Vol. 100, No. 1, 01.01.2015, p. 130-137.

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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.",

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AU - Shatskiy, Anton

AU - Rashchenko, Sergey V.

AU - Ohtani, Eiji

AU - Litasov, Konstantin D.

AU - Khlestov, Mikhail V.

AU - Borzdov, Yuri M.

AU - Kupriyanov, Igor N.

AU - Sharygin, Igor S.

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AB - 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.

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KW - Phase relations

KW - Siderite

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