Feldspar relations in Icelandic alkalic rhyolites
- 1 December 1971
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 38 (296) , 503-510
- https://doi.org/10.1180/minmag.1971.038.296.13
Abstract
Summary: Alkalic rhyolites with peralkaline affinities, bearing quartz and potassic feldspar phenocrysts, are described from Iceland for the first time. Evidence from electron-probe analyses of feldspar phenocrysts indicates crystallization in or near the thermal valley of the system SiO2-Or-Ab. Icelandic acid volcanic rocks are subdivided into alkalic rhyolites, belonging to transitional and alkalic basalt lineages, and the mildly calc-alkaline rhyolites of tholeiite lineages.Keywords
This publication has 3 references indexed in Scilit:
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- Petrography of the Samoan IslandsGSA Bulletin, 1944
- The Volcanic Rocks of South-Eastern Queensland.The Proceedings of the Royal Society of Queensland, 1916