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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

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1945-3027
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Volume 100, Issue 1

Issues

The system Na2CO3-FeCO3 at 6 GPa and its relation to the system Na2CO3-FeCO3-MgCO3

Anton Shatskiy
  • Corresponding author
  • V.S. Sobolev Institute of Geology and Mineralogy, Russian Academy of Science, Siberian Branch, Koptyuga pr. 3, Novosibirsk 630090, Russia
  • Novosibirsk State University, Novosibirsk 630090, Russia
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/ Sergey V. Rashchenko
  • V.S. Sobolev Institute of Geology and Mineralogy, Russian Academy of Science, Siberian Branch, Koptyuga pr. 3, Novosibirsk 630090, Russia
  • Novosibirsk State University, Novosibirsk 630090, Russia
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/ Eiji Ohtani
  • V.S. Sobolev Institute of Geology and Mineralogy, Russian Academy of Science, Siberian Branch, Koptyuga pr. 3, Novosibirsk 630090, Russia
  • Department of Earth and Planetary Material Science, Tohoku University, Sendai 980-8578, Japan
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/ Konstantin D. Litasov
  • V.S. Sobolev Institute of Geology and Mineralogy, Russian Academy of Science, Siberian Branch, Koptyuga pr. 3, Novosibirsk 630090, Russia
  • Novosibirsk State University, Novosibirsk 630090, Russia 3Department of Earth and Planetary Material Science, Tohoku University, Sendai 980-8578, Japan
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/ Mikhail V. Khlestov
  • V.S. Sobolev Institute of Geology and Mineralogy, Russian Academy of Science, Siberian Branch, Koptyuga pr. 3, Novosibirsk 630090, Russia
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/ Yuri M. Borzdov
  • V.S. Sobolev Institute of Geology and Mineralogy, Russian Academy of Science, Siberian Branch, Koptyuga pr. 3, Novosibirsk 630090, Russia
  • Novosibirsk State University, Novosibirsk 630090, Russia 3Department of Earth and Planetary Material Science, Tohoku University, Sendai 980-8578, Japan
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/ Igor N. Kupriyanov
  • V.S. Sobolev Institute of Geology and Mineralogy, Russian Academy of Science, Siberian Branch, Koptyuga pr. 3, Novosibirsk 630090, Russia
  • Novosibirsk State University, Novosibirsk 630090, Russia 3Department of Earth and Planetary Material Science, Tohoku University, Sendai 980-8578, Japan
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/ Igor S. Sharygin
  • V.S. Sobolev Institute of Geology and Mineralogy, Russian Academy of Science, Siberian Branch, Koptyuga pr. 3, Novosibirsk 630090, Russia
  • Novosibirsk State University, Novosibirsk 630090, Russia
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/ Yuri N. Palyanov
  • V.S. Sobolev Institute of Geology and Mineralogy, Russian Academy of Science, Siberian Branch, Koptyuga pr. 3, Novosibirsk 630090, Russia
  • Novosibirsk State University, Novosibirsk 630090, Russia
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Published Online: 2015-01-10 | DOI: https://doi.org/10.2138/am-2015-4777

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 R3̅ eitelite structure with cell parameters a = 4.9712(16), c = 16.569(4) Å, 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.

Keywords: Natrite; siderite; eitelite; high-pressure experiment; carbonatite; phase relations; mantle; melting

About the article

Received: 2013-10-16

Accepted: 2014-07-19

Published Online: 2015-01-10

Published in Print: 2015-01-01


Citation Information: American Mineralogist, Volume 100, Issue 1, Pages 130–137, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2015-4777.

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© 2015 by Walter de Gruyter Berlin/Boston.

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