The system diopside-acmite-nepheline at low oxygen fugacity

K. Onuma, S. Ikeda, E. Ohtani, Takumi Kato

Research output: Contribution to journalArticle

Abstract

Nepheline component (NaAlSiO4, 20 wt.%) was added to the join diopside(CaMgSi2O6)-acmite(NaFeSi2O6) and the phase relations were determined at 10-12 atm fO2 and 1050-1300°C. The liquidus lines for wustite and clinopyroxene cross each other at about 1160°C and the composition of Di24Ac56Ne20. The field of clinopyroxene + wustite + liquid extends from Di15Ac75Ne20 to Di40AC40Ne20 at 1050°C. In the Di-rich region the phase relations are complicated. Olivine appears as second phase, but disappears at lower temperatures (<1100°C). Melilite (<1200°C) and nepheline (<1150°C) are present at lower temperature region and coexist with olivine and/or clinopyroxene. -Authors

Original languageEnglish
Pages (from-to)123-126
Number of pages4
JournalJournal of Mineralogy, Petrology and Economic Geology
Volume87
Issue number4
DOIs
Publication statusPublished - Jan 1 1992

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nepheline
diopside
fugacity
clinopyroxene
oxygen
olivine
melilite
liquid

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

The system diopside-acmite-nepheline at low oxygen fugacity. / Onuma, K.; Ikeda, S.; Ohtani, E.; Kato, Takumi.

In: Journal of Mineralogy, Petrology and Economic Geology, Vol. 87, No. 4, 01.01.1992, p. 123-126.

Research output: Contribution to journalArticle

Onuma, K. ; Ikeda, S. ; Ohtani, E. ; Kato, Takumi. / The system diopside-acmite-nepheline at low oxygen fugacity. In: Journal of Mineralogy, Petrology and Economic Geology. 1992 ; Vol. 87, No. 4. pp. 123-126.
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