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Contact metamorphism and fluid movement around the Easky adamellite, Ox Mountains, Ireland

Published online by Cambridge University Press:  05 July 2018

Bruce W. D. Yardley  and
C. Barry Long
Bruce W. D. Yardley
Affiliation:
School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ
C. Barry Long
Affiliation:
Geological Survey of Ireland, 14 Hume Street, Dublin 2, Ireland
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Abstract

Contact metamorphism in the aureole of the Easky adamellite produced andalusite at the expense of regional staurolite, kyanite, and garnet. In the inner aureole sillimanite and K-feldspar also grew. Cordierite is only rarely present. Conditions of metamorphism in the inner aureole have been deduced from five independent criteria as 595 ± 30 °C and 2.5 ± 0.5kb. The nearby Lough Talt adamellite was emplaced at slightly higher pressures. Some aureole rocks have undergone oxidation with conversion of regional garnet to magnetite and andalusite. The reacting assemblage buffered ƒO2 near 10−17 bars. It is inferred that oxidation was caused by movement of H2O from the country rocks into the intrusion.

Type
Research Article
Information
Mineralogical Magazine , Volume 44 , Issue 334 , June 1981 , pp. 125 - 131
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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