The Lough Guitane volcanic complex, County Kerry; a preliminary survey

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Authors:Avison, M.
Volume Title:Irish Journal of Earth Sciences
Source:Irish Journal of Earth Sciences, 6(2), p.127-136. Publisher: Royal Irish Academy, Dublin, Ireland. ISSN: 0790-1763
Publication Date:1984
Note:In English
Summary:Rhyolite lavas, up to 300 m thick, and volcaniclastics are interbedded with Upper Devonian clastic sediments of the Irish Munster basin. The complex comprises three volcanic centres: Horses Glen, Bennaunmore and Killeen. Laterally discontinuous agglomerates ("boulder tuffs') occur in Bennaunmore centre. Two phases of volcanic activity comprised an earlier (Horses Glen) and a later (Bennaunmore and Killeen) centre. The rhyolites (50-300 m thick) show relict spherulites, perlites and flow-laminae (recrystallized to quartz, feldspar, chlorite, sericite intergrowths), representing a primary glass matrix. The lavas are classified as quartz keratophyres, and modal phenocrysts (<5%) are quartz, plagioclase and altered mafics. Accessories include zircon, anatase, allanite, sphene, chalcopyrite and fluorite. The similarities between the rocks of the three centres suggest a granite intrusion at depth. [R.K.H.]
Subjects:Clastic rocks; Devonian; Glasses; Granites; Igneous rocks; Intrusions; Keratophyre; Matrix; Paleozoic; Perlite; Petrography; Phenocrysts; Plutonic rocks; Quartz keratophyre; Relict materials; Rhyolites; Sedimentary rocks; Spherulites; Upper Devonian; Volcanic centers; Volcanic features; Volcanic rocks; Volcaniclastics; Europe; Ireland; Kerry Ireland; Western Europe; Bennaunmore; Horses Glen volcanic center; Killeen volcanic center; Lough Guitane Complex; Munster Basin
Coordinates:N514400 N523600 W0090700 W0103900
Abstract Numbers:86M/2369
Record ID:2014074404
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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