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A “Vein” of Trondhjemite aplite: Granitization of Quartzite forming the sole of a Fold-thrust, Malin Head, Co. Donegal

Published online by Cambridge University Press:  01 May 2009

Doris L. Reynolds
Doris L. Reynolds
Affiliation:
Grant Institute of Geology, University of Edinburgh.
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Abstract

A narrow layer of quartzite, emplaced within epidiorite by foldthrusting, is transformed to albite-trondhjemite aplite and contiguous zones of the epidiorite are enriched in biotite. By reference to six chemical analyses it is found that, with but small additions of potash these transformations can be accounted for by the combined processes of (a) mechanical mixing of the initial quartzite and epidiorite, and (b) metamorphic inter-diffusion between this mixture and the adjoining epidiorite.

Type
Articles
Information
Geological Magazine , Volume 98 , Issue 3 , June 1961 , pp. 195 - 209
Copyright
Copyright © Cambridge University Press 1961

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