Abstract
POWELL et al.1 have recently shown that the isotopic composition of strontium in carbonatites is significantly different from that found in limestones. The mean calculated 87Sr/86Sr for carbonatites is given as 0.7065 ± 0.0003, while limestones have in general a 87Sr/86Sr ratio greater than 0.7090 (range 0.709–0.714). Pursuing a similar line of investigation we have examined the strontium isotopes of samples from a number of African carbonatite complexes, African limestones, and of strontium minerals from several localities, with results which are in good agreement with Powell's. The results are given in Table 1, and the distribution of the relative values in Fig. 1.
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References
Powell, J. L., Hurley, P. M., and Fairbairn, H. W., Nature, 196, 1085 (1962).
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HAMILTON, E., DEANS, T. Isotopic Composition of Strontium in some African Carbonatites and Limestones and in Strontium Minerals. Nature 198, 776–777 (1963). https://doi.org/10.1038/198776a0
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DOI: https://doi.org/10.1038/198776a0
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