An experimental study of the joins leucite-akermanite-albite and leucite-akermanite-albite_<50>anorthite_<50> at atmospheric pressure and 1GPa (H_2O-saturated conditions) : Its significance in the leucite-sodic plagioclase and melilite-plagioclase incompa

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概要

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• Leucite-sodic plagioclase and melilite-plagioclase do not coexist in natural rocks. However, leucite and calcium-rich plagioclase may remain in equilibrium in alkaline silica-deficient rocks. The join leucite-akermanite-albite studied at atmospheric pressure is characterized by two four-phase points: one point occurs at leucite31akermanite47albite22 and 1275 °C, where leucitess, melilitess and diopsidess coexist in equilibrium with liquid, and the other point occurs at leucite38akermanite22albite40 and 1250 °C, where diopsidess, alkali feldspar, leucitess and liquid are in equilibrium. In the case of the join leucite-akermanite-albite50anorthite50 investigated at atmospheric pressure, there are two four-phase points: one point occurs at leucite14akermanite48(albite50anorthite50)38 and 1260 °C, where melilitess, leucitess, diopsidess and liquid coexist in equilibrium, and the other point occurs at leucite15akermantite35(albite50anorthite50)50 and 1240 °C, where diopsidess, leucitess and calcium-rich plagioclase are in equilibrium with liquid.     When the join leucite-akermanite-albite50anorthite50 was studied at 1 GPa (in H2O-saturated conditions) to determine the effect of pressure, it was noted that the field of melilitess completely disappears, and this join is characterized by a single four-phase point occurring at leucite43akermanite22(albite50anorthite50)35 and 1060 °C, where diopsidess, calcium-rich plagioclase, and leucitess are in equilibrium with liquid. The present study indicates that: 1) leucite and sodic plagioclase do not coexist in equilibrium. When leucite is in equilibrium with feldspar, it is alkali feldspar having the compositional range, An3-4Ab50-53Or45-47. 2) In the presence of leucite, akermanite and albite react to form diopsidess, nepheliness, wollastonitess, and alkali feldspar. 3) In the join leucite-akermanite-albite50anorthite50, plagioclase coexisting with leucite has the compositional range, An60-66Ab17-26Or12-17. 4) In the join leucite-akermanite-albite50anorthite50 studied at 1 GPa (in H2O-saturated conditions), melilite is completely eliminated.

• 日本鉱物科学会の論文
• 2007-10-01

著者

• Gupta Alok

  National Centre Of Experimental Mineralogy And Petrology University Of Allahabad

• ARIMA Makoto

  Geological Institute, Yokohama National University

• Arima Makoto

  Geological Institute Yokohama National University

• DWIVEDI Mrigank

  National Centre of Experimental Mineralogy and Petrology, University of Allahabad

• Dwivedi Mrigank

  National Centre Of Experimental Mineralogy And Petrology University Of Allahabad

• Arima Makoto

  Geological Institute Graduate School Of Environment And Information Sciences Yokohama National Unive

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