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Chemical petrology and K–Ar ages of the Lewisian gneisses of Rona, near Skye, Scotland

Published online by Cambridge University Press:  01 May 2009

J. G. Holland  and
R. ST J. Lambert
J. G. Holland
Affiliation:
Department of GeologyScience LaboratoriesSouth RoadDurham
R. ST J. Lambert
Affiliation:
Department of GeologyUniversity of AlbertaEdmonton, Alberta, Canada
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Summary

The average chemical composition of the biotite–gneisses of Rona is very close to that of similar gneisses in the Laxford area, and nearly as close to those of the Torridon area. The biotite–gneisses of Rona are slightly richer in Li, Ba and Zr, slightly lower in Mg and Sr and have a higher Fe2O3/MgO ratio than their mainland counterparts. Biotite mineral ages of 1400 m.y. and hornblende mineral ages of up to 1750 m.y. indicate a similar late-metamorphic history to that of the mainland Laxford assemblage.

Type
Articles
Information
Geological Magazine , Volume 109 , Issue 4 , July 1972 , pp. 339 - 347
Copyright
Copyright © Cambridge University Press 1972

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