The Age of the Hoy Lavas, Orkney
- 1 March 1977
- journal article
- Published by Geological Society of London in Scottish Journal of Geology
- Vol. 13 (1) , 43-52
- https://doi.org/10.1144/sjg13010043
Abstract
Synopsis: The Hoy Lavas are alkaline olivine basalts, occurring at the base of presumed Upper Old Red Sandstone, and resting unconformably on Middle Old Red Sandstone strata. Mean conventional K-Ar ages of the lavas are discordant and range from 300 to 333 Ma. A cross-cutting monchiquite dyke yields a conventional K-Ar age of 235 Ma. 40 Ar– 39 Ar stepwise degassing analyses of two samples indicate an age of approximately 370 Ma for the lavas. A revision of the age of the Givetian/Frasnian boundary is suggested.Keywords
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