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Stability relations of chromium kyanite at high pressures and temperatures

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Abstract

The pseudobinary section Al2SiO5-“Cr2SiO5” of the system Al2O3-Cr2O3-SiO2 has been investigated at 20 and 30 kb pressure in the temperature range 1,000–1,600° C. The solubility of “Cr2SiO5” in kyanite (Al2SiO5) extends up to 24 mole % “Cr2SiO5” at 20 kb and 31 mole % at 30 kb. The extent of this solid solution is not notably dependent on temperature in the range studied. The stability of kyanite is increased by the substitution Cr ⇌ Al by about 80° C at 20 kb as compared to Cr-free kyanite. Cr-poor sillimanite and Cr-rich kyanite can stably coexist in a temperature interval of up to 80° C at 20 kb and about 150° C at 25 kb.

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References

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Seifert, F., Langer, K. Stability relations of chromium kyanite at high pressures and temperatures. Contr. Mineral. and Petrol. 28, 9–18 (1970). https://doi.org/10.1007/BF00389223

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Keywords

  • Chromium
  • Solid Solution
  • High Pressure
  • Mineral Resource
  • Temperature Interval