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An Appinitic Intrusion-Breccia at Kilkenny, Maas, Co. Donegal

Published online by Cambridge University Press:  01 May 2009

W. S. Pitcher  and
H. H. Read
W. S. Pitcher
Affiliation:
Department of Geology, Imperial College, London, S.W. 7.
H. H. Read
Affiliation:
Department of Geology, Imperial College, London, S.W. 7.
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Abstract

An intrusion-breccia filling a pipe is made of two parts, one of facetted quartzite fragments in a granophyric matrix, the other of calc-silicate-rock fragments in an appinitic matrix. The quartzite fragments are derived from a horizon at least 1,000 ft. below the breccia level, the calc-silicate-rock fragments are local. The mechanism of emplacement of the breccia is considered to be similar to that proposed by H. Cloos for the Swabian tuff-pipes. Neither the granophyre nor the appinite of the Kilkenny pipe is regarded as of magmatic origin.

Type
Articles
Information
Geological Magazine , Volume 89 , Issue 5 , October 1952 , pp. 328 - 336
Copyright
Copyright © Cambridge University Press 1952

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References

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