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Biotite- and Sphene-rich rocks in the Moine Series of Ardnamurchan, Argyllshire

Published online by Cambridge University Press:  01 May 2009

B. C. M. Butler
B. C. M. Butler
Affiliation:
Department of Geology and Mineralogy, University Museum, Oxford.
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Abstract

Schists composed essentially of biotite and sphene have been found in many localities in the psammitic groups of the Moine Series in Ardnamurchan. From petrographic and chemical evidence it is concluded that they were heavy mineral bands, composed of sphene and iron oxides with a matrix which was partly pelitic and partly quartzo-feldspathic. This postulated original composition may have been produced by sedimentary slumping, for which field evidence is available. The unusual chemical composition was probably accentuated at higher grades of metamorphism by metamorphic metamorphic segregation, particularly a loss of soda or of segregation, particularly a loss of soda or of albite into the surrounding arkoses.

Type
Articles
Information
Geological Magazine , Volume 99 , Issue 2 , April 1962 , pp. 173 - 182
Copyright
Copyright © Cambridge University Press 1962

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References

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