An Appinitic Intrusion-Breccia at Kilkenny, Maas, Co. Donegal
- 1 October 1952
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 89 (5), 328-336
- https://doi.org/10.1017/s0016756800067923
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.Keywords
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