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1991•JOURNAL OF MINERALOGY PETROLOGY AND ECONOMIC GEOLOGYOpen access

The system diopside-akermanite-gehlenite at 1 atm.

Kosuke Onuma, HIDEYA MORIDAIRA

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Abstract

The pseudobinary system diopside (CaMgSi2O6)-gehlenite (Ca2A12SiO7) has a pseudoeutectic point, where diopside solid solution and melilite solid solution coexist with liquid, at 1295±3°C and Di75Geh25. Below solidus temperatures (1225±10°C) anorthite appears and coexists with melilitess and/or diopsidess. The system diopside-akermanite (Ca2MgSi2O7)-gehlenite dose not have the point at which three crystalline phases and liquid coexist, but a phase boundary along which diopsidess and melilitess coexist with liquid. Temperature minimum seems to exist at the central part of the primary field of melilitess. The phase assemblages below solidus temperatures are diopsidess+ melilitess in the Ca2MgSi2O7-rich region and diopsidess+ melilitess+anorthite in the Ca2Al2SiO7-rich region.

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The pseudobinary system diopside (CaMgSi2O6)-gehlenite (Ca2A12SiO7) has a pseudoeutectic point, where diopside solid solution and melilite solid solution coexist with liquid, at 1295±3°C and Di75Geh25. Below solidus temperatures (1225±10°C) anorthite appears and coexists with melilitess and/or diopsidess. The system diopside-akermanite (Ca2MgSi2O7)-gehlenite dose not have the point at which three crystalline phases and liquid coexist, but a phase boundary along which diopsidess and melilitess coexist with liquid. Temperature minimum seems to exist at the central part of the primary field of melilitess. The phase assemblages below solidus temperatures are diopsidess+ melilitess in the Ca2MgSi2O7-rich region and diopsidess+ melilitess+anorthite in the Ca2Al2SiO7-rich region.

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Available abstract

The pseudobinary system diopside (CaMgSi2O6)-gehlenite (Ca2A12SiO7) has a pseudoeutectic point, where diopside solid solution and melilite solid solution coexist with liquid, at 1295±3°C and Di75Geh25. Below solidus temperatures (1225±10°C) anorthite appears and coexists with melilitess and/or diopsidess. The system diopside-akermanite (Ca2MgSi2O7)-gehlenite dose not have the point at which three crystalline phases and liquid coexist, but a phase boundary along which diopsidess and melilitess coexist with liquid. Temperature minimum seems to exist at the central part of the primary field of melilitess. The phase assemblages below solidus temperatures are diopsidess+ melilitess in the Ca2MgSi2O7-rich region and diopsidess+ melilitess+anorthite in the Ca2Al2SiO7-rich region.

Key concepts: Gehlenite, Solidus, Diopside, Anorthite, Melilite, Thermodynamics, Phase boundary, Solid solution

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