A Geochronological and Strontium Isotope Study on the Garabal Hill-Glen Fyne Igneous Complex, Scotland

1 February 1966

journal article
research article
Published by Cambridge University Press (CUP) in Geological Magazine

Vol. 103 (2) , 153-165
https://doi.org/10.1017/s0016756800050548

Abstract

The age of the Garabal Hill-Glen Fyne igneous complex has been determined as 392 ± 4 m.y., by the Rb-Sr method. The components of the complex had an average initial (⁸⁷Sr/⁸⁶Sr)₀isotope ratio of 0·705 ± 0·003. Geological contamination of marginal components is reflected in the (⁸⁷Sr/⁸⁶Sr)₀values of these rocks which were found to beca. 0·710, significantly higher than values from uncontaminated samples. The results are in accord with the view that the individual members of the complex had a common source, comparable with regard to the Rb/Sr ratio, to the source of basalts. It is inferred that complete melting of such source material followed by magmatic differentiation is an appropriate mechanism of origin for the complex.

Keywords

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