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A geochemical study of Lewisian metasedimentary granulites and gneisses in the Scourie-Laxford area of the north-west Scotland

Published online by Cambridge University Press:  05 July 2018

P. O. Okeke ,
G. D. Borley  and
J. Watson
P. O. Okeke
Affiliation:
Department of Geology, University of Benin, Private Bag 1154, Benin CityNigeria
G. D. Borley
Affiliation:
Department of Geology, Imperial College, Prince Consort Road, London SW7
J. Watson
Affiliation:
Department of Geology, Imperial College, Prince Consort Road, London SW7
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Abstract

Major element, trace element, and REE data for metasedimentary granulites and their retrogressed derivatives formed from Archaean parent-rocks at two localities in the Lewisian complex of north-west Scotland are presented.

The metasedimentary rocks are enclosed in and intruded by metatonalites and related calc-alkaline rocks and have been highly deformed and metamorphosed along with these rocks. They are geochemically distinct from this meta-igneous suite and range from highly aluminous to highly siliceous types. Comparisons of major and trace element data with those for unmetamorphosed Archaean and post-Archaean sediments suggest that they are derived from a detrital shale-greywacke assemblage, which may have included a volcaniclastic component. High ΣREE and ΣLREE suggest that the source-rocks included fractionated felsic igneous rocks.

Evidence that depletion in the large ion lithophile elements K, Rb, Th accompanied high-pressure granulite metamorphism supports the view, based on data derived from the associated meta-igneous rocks, that depletion was effected by active fluids rather than by abstraction of a partial melt and suggests that removal of K and Th began only when a considerable reduction of Rb had taken place.

Type
Research Article
Information
Mineralogical Magazine , Volume 47 , Issue 342 , March 1983 , pp. 1 - 9
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1983

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