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Garnet-biotite-cordierite thermometry and barometry in the Cashel thermal aureole, Connemara, Ireland

Published online by Cambridge University Press:  05 July 2018

Peter J. Treloar
Peter J. Treloar*
Affiliation:
Department of Earth Sciences, Downing Street, Cambridge, CB2 3EQ, UK
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Abstract

A number of geothermometers and geobarometers involving coexisting garnet, biotite, and cordierite have been used to calculate the pressures and temperatures of metamorphism of the Cashel thermal aureole in Connemara. Temperatures from the garnetbiotite thermometer show a wide variation between calibrations, and are markedly different from those obtained from the garnet-ordierite thermometer. These variations, together with the possibility of extensive reequilibration between garnet and cordierite rims and biotite, indicate that the use of exchange reaction thermometry, for these rocks at least, may be invalid. The various calibrations of the garnet-cordierite-sillimanitequartz geobarometer give reasonably consistent pressure estimates which, after allowance for partial pressures of water, indicate pressures of metamorphism of about 5±1 kb.

Type
Research Article
Information
Mineralogical Magazine , Volume 44 , Issue 334 , June 1981 , pp. 183 - 189
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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