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Apatite composition and the fugacities of HF and HC1 in metamorphic fluids

Published online by Cambridge University Press:  05 July 2018

Bruce W. D. Yardley
Bruce W. D. Yardley*
Affiliation:
Department of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ
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Abstract

Microprobe analyses of the halogen contents of apatites from two samples of amphibolite-facies schist from Connemara, Ireland, have been used to calculate the fugacity ratios fHCl/fH2O and fHF/fH2O using the experimental data of Korzhinskiy. The results imply fugacities for both acids in the range 0.03 to 0.1 bars, but whereas for the lower grade rock fHF > fHCl, the migmatitic sample gives fHF⋍fHCl. An independent estimate of fHF/fH2O from the biotite composition in one sample is in acceptable agreement with the result obtained from apatite.

Keywords

apatitehalogensmetamorphic fluidschistConnemaraIreland
Type
Research Article
Information
Mineralogical Magazine , Volume 49 , Issue 350 , March 1985 , pp. 77 - 79
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985 

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Footnotes

*

Present address: Department of Earth Sciences, The University, Leeds LS2 9JT.

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