A Geochronological and Strontium Isotope Study on the Garabal Hill-Glen Fyne Igneous Complex, Scotland
1966; Cambridge University Press; Volume: 103; Issue: 2 Linguagem: Inglês
10.1017/s0016756800050548
ISSN1469-5081
Autores Tópico(s)Geology and Paleoclimatology Research
ResumoAbstract 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 ( 87 Sr/ 86 Sr) 0 isotope ratio of 0·705 ± 0·003. Geological contamination of marginal components is reflected in the ( 87 Sr/ 86 Sr) 0 values of these rocks which were found to be ca . 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.
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