Skip to main content
Log in

Activity-composition relationships for pyrope-grossular garnet

  • Published:
Contributions to Mineralogy and Petrology Aims and scope Submit manuscript

Abstract

Activity coefficients (γ) for grossular in pyrope-grossular garnet have been determined experimentally using the divariant assemblage garnet-anorthite-sillimanite (kyanite)-quartz. Values of γ for garnets with 10–12 mole % grossular have been obtained at 1000 °, 1100 °, 1200 ° and 1300 ° C at pressures between 15 and 21 Kb. The data are consistent with a symmetrical regular solid model for grossular-pyrope solid solutions. The interaction parameter (W) increases linearly with decreasing temperature and is given by W = 7460-4.3 T cals (T in °K). A solvus in the pyrope-grossular solid solution is predicted with a temperature of critical mixing of 629°C±90 ° C.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  1. Saxena, S. K.: Distribution of elements between coesisting minerals and the nature of solid solution in garnet. Am. Mineralogist 53, 994 (1968)

    Google Scholar 

  2. Ganguly, J., Kennedy, G. C.: The energetics of garnet solid solution. I. Mixing of the alumino silicate end members Contrib. Mineral. Petrol. 48, 137 (1974)

    Google Scholar 

  3. Wood, B. J.: The application of thermodynamics to some subsolidus equilibria involving solid solutions. Fortschr. Mineral. (1975, in press)

  4. Thompson, J. B. Jr.: Thermodynamic properties of simple solid solutions, P. H. Abelson, ed. Research in Geochem. 2, 340 (1967)

  5. Hays, J. F.: Lime-alumina-silica. Carnegie Inst. Wash. Year Book 65, 234 (1966)

    Google Scholar 

  6. Hariya, Y., Kennedy, G. C.: Equilibrium study of anorthite under high pressure and high temperature. Am. J. Sci. 266, 193 (1968)

    Google Scholar 

  7. Newton, R. C.: Some calc-silicate equilibrium relations. Am. J. Sci. 264, 204 (1966)

    Google Scholar 

  8. Boyd, F. R., England, J. L.: Apparatus for phase equilibrium measurements at pressures up to 50 kilo bars and temperatures up to 1750 °C. J. Geophys. Res. 65, 741 (1960)

    Google Scholar 

  9. Hensen, B. J., Barton, M.: Procedure and calibration of the piston cylinder apparatus. NBRC Progress in Exp. Petrol., 3rd report (1975, in press)

  10. Reed, S. J. B., Ware, N. G.: Quantitative electron microprobe analysis using a lithium drifted silicon detector. X-Ray Spectrom. 2, 69 (1973)

    Google Scholar 

  11. Hensen, B. J.: The relative stability of garnet granulite and kyanite eclogite. Carnegie Inst. Wash. Yearbook 71, 426 (1972)

    Google Scholar 

  12. Hensen, B. J.: The stability of pyrope-grossular garnet with excess silica. In preparation

  13. O'Hara, M. J., Richardson, S. W., Wilson, G.: Garnet peridotite stability and occurrence in crust and mantle. Contrib. Mineral. Petrol. 32, 48 (1971)

    Google Scholar 

  14. Richardson, S. W., Bell, P. M., Gilbert, M. C.: Kyanite-sillimanite equilibrium between 700 ° and 1500 ° C. Am. J. Sci. 266, 513 (1968)

    Google Scholar 

  15. Orville, P. M.: Plagioclase cation exchange equilibria with aqueous chloride solution: results at 700- C and 2000 bars in the presence of quartz. Am. J. Sci. 272, 234 (1972)

    Google Scholar 

  16. Schmid, R., Wood, B. J.: Phase relationships in granulite metapelites from the Ivrea zone (Northern Italy). Contrib. Mineral. Petrol, (in press)

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Hensen, B.J., Schmid, R. & Wood, B.J. Activity-composition relationships for pyrope-grossular garnet. Contr. Mineral. and Petrol. 51, 161–166 (1975). https://doi.org/10.1007/BF00372076

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00372076

Keywords

Navigation