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The petrochemistry of some Lewisian granitic rocks

Published online by Cambridge University Press:  14 March 2018

D. R. Bowes
D. R. Bowes*
Affiliation:
Department of Geology, The University, Glasgow, W.2
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Summary

The chemical compositions of eighty granitic rocks from the Lewisian of the North-West Highlands of Scotland, particularly from the Gairloch district, are set out in relation to geological occurrence and their normative proportions of albite, orthoclase, quartz, and anorthite compared with experimental data relating to the systems NaAlSi3O8-KAlSi3O8-SiO2-H2O and KAlSi3O8-NaAlSi2O8-CaAl2Si2O8-SiO2. The field of composition for these Lewisian rocks moves from Ab-Q-rich for autochthonous granites to Ab = Or = Q (approximately) for parautochthonous granites to Or-rich for intrusive granites. This trend is related to the varying roles of mineral solubility under stress, selective melting, and potassium metasomatism.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 279 , September 1967 , pp. 342 - 363
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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