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Alkali feldspars from part of the Galway granite, Ireland

Published online by Cambridge University Press:  05 July 2018

J. R. Wilson  and
J. S. Coats
J. R. Wilson
Affiliation:
Geologisk Institut, Aarhus Universitet, Ole Worms Alle, 8000 Århus C, Denmark
J. S. Coats
Affiliation:
Institute of Geological Sciences, 64-78 Grays Inn Road, London W.C. I, Great Britain
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Summary

The structural states of alkali feldspars from the eastern end of the Galway Granite show transitions from orthoclase to microcline as a result of late deformation. Analyses of twenty samples for SiO2, Al2O3, TiO2, Fe2O3, CaO, Na2O, K2O, S, Cu, Zn, Ga, Rb, Sr, Ba, and Pb agree with previously determined orders of entry of elements into the ‘alkali site’. A relationship between this order of entry and the melting points of feldspar end-members is discussed.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 299 , September 1972 , pp. 801 - 810
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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