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Thermodynamics of the Garnet—Plagioclase—Al2SiO5—Quartz Geobarometer

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Thermodynamics of Minerals and Melts

Part of the book series: Advances in Physical Geochemistry ((PHYSICAL GEOCHE,volume 1))

Abstract

Until recently, the development of mineralogic geobarometry of crustal metamorphic assemblages has lagged far behind minéralogic geothermometry. Temperatures of crystallization of metamorphic rocks can be deduced from a number of relatively reliable thermometers. Pressures of metamorphism, on the other hand, have been estimated mainly semiquantitatively with reference to a few simple univariant equilibria such as the Al2SiO5 polymorphic relations. Various geobarometers based on continuous variation of mineral compositions have been proposed, but most of these are still in the conceptual stage, either lacking an underpinning of experimental or thermodynamic calibration or beset with as yet unresolved experimental difficulties, such as the H2O content of cordierite and its debated effects on the cordierite-garnet (Fe, Mg) partitioning geobarometer (Newton and Wood, 1979).

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Newton, R.C., Haselton, H.T. (1981). Thermodynamics of the Garnet—Plagioclase—Al2SiO5—Quartz Geobarometer. In: Newton, R.C., Navrotsky, A., Wood, B.J. (eds) Thermodynamics of Minerals and Melts. Advances in Physical Geochemistry, vol 1. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-5871-1_7

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  • DOI: https://doi.org/10.1007/978-1-4612-5871-1_7

  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4612-5873-5

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