A new K—Ar age from uppermost Tremadoc rocks of north Wales
- 1 March 1982
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 119 (2) , 207-211
- https://doi.org/10.1017/s0016756800025899
Abstract
Summary: New conventional K–Ar dating of virtually unaltered pargasite phenocrysts extracted from a metabasalt of the uppermost Tremadocian Rhobell Volcanic Group, cropping out near Dolgellau, Gwynedd, north Wales, yields an age of 508 ± 11 Ma. This result provides a valuable new time-scale calibration point although incompatible with some other versions of the radiometric time-scale for the Lower Palaeozoic which have indicated ages of less than 508 ± 11 Ma for the Tremadoc/Arenig boundary.Keywords
This publication has 24 references indexed in Scilit:
- Low grade and very low grade regional metabasic Ordovician rocks of Llŷn and Snowdonia, Gwynedd, North WalesGeological Magazine, 1981
- Discussion of a paper by McKerrow, Lambert and Chamberlain on the Ordovician, Silurian and Devonian time scalesEarth and Planetary Science Letters, 1980
- A Rb-Sr whole rock isochron for the Stockdale Rhyolite of the English Lake District and a revised mid-Palaeozoic time-scaleJournal of the Geological Society, 1979
- Radiometric age of the Monograptus cyphus graptolite zone in Southeastern Alaska — an estimate of the age of the Ordovician—Silurian boundaryGeological Magazine, 1977
- Subdivision of Ordovician and Silurian time scale using accumulation rates of graptolitic shaleGeology, 1977
- Radiometric age of volcanics of the Cambrian “Krivoklat-Rokycany” complex (Bohemian Massif)International Journal of Earth Sciences, 1975
- Geological time scaleReports on Progress in Physics, 1974
- The Cambro ‐ Ordovician boundaryLethaia, 1973
- The Cambrian and Ordovician rocks of the Migneint area, North WalesJournal of the Geological Society, 1973
- The pre-Pleistocene Phanerozoic time-scale — a reviewGeological Society, London, Special Publications, 1971