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The Mode of Occurrence of Sillimanite in the Glen District, Co. Donegal

Published online by Cambridge University Press:  01 May 2009

C. F. Tozer
C. F. Tozer
Affiliation:
Geology Department. Imperial College, London, S.W.7.
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Abstract

Sillimanite produced by the contact action of the Donegal Granite shows varied textural and time relationships with the other minerals of the schists in which it occurs. Early Sillimanite was formed in the main stage of metamorphism by destruction of biotite, K, Fe, and Mg being expelled in the process. A later influx of new K from the granite led to the growth of muscovite metacrysts. This was associated with destruction of part of the early Sillimanite, recrystallization of part, growth of a new crop of Sillimanite needles, and formation of muscovite-sillimanite intergrowths.

Type
Articles
Information
Geological Magazine , Volume 92 , Issue 4 , August 1955 , pp. 310 - 320
Copyright
Copyright © Cambridge University Press 1955

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References

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