K–Ar and Rb–Sr isotopic age studies on the Wolf Rock nosean phonolite, Cornwall
- 1 January 1975
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 112 (1) , 55-61
- https://doi.org/10.1017/s0016756800045581
Abstract
Summary: Potassium–argon and rubidium–strontium isotopic age studies of the Wolf Rock phonolite of SW England confirm its age as 131 Ma, with an initial87Sr/88Sr ratio of 0.703. The existence of a Mesozoic volcanic province of this age on the margin of the Labrador–Biscay rift is discussed with special reference to its implications for the early evolution of the N.Atlantic Ocean, and the general relationship of alkaline igneous activity to major periods of plate reorientation.Keywords
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