Pyroclastic rocks in the Cnapan Breaca felsite, Rhum
- 1 May 1985
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 122 (5) , 447-450
- https://doi.org/10.1017/s0016756800035366
Abstract
The Cnapan Breaca felsite sheet contains strongly devitrified pyroclastic rocks including welded tuffs. These indicate formation in a high level, surficial or sub-volcanic environment. The gross structure and lithological associations of the sheet are similar to those of some ignimbrites. These observations support a resurgent caldera model for the evolution of the Rhum centre and raise some doubts about previous interpretations of the felsite-breccia association on the island.Keywords
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