Abstract
RECENT work on the strontium isotopes, stimulated by a paper of Gast1, has shown variations in the initial 87Sr/86Sr ratio of rocks. The interpretation of this observation has not been clear but it has been implied that ratios similar to those in basalts define an origin more or less directly from mantle material2–4. Higher ratios have been interpreted as indicating crustal derivation of magmatic rocks. Recently, Hamilton6 stated that he did not necessarily assume that low 87Sr/86Sr ratios observed in carbonatites implied a derivation of the material from the mantle. He postulated that deep crustal material might have Kb/Sr ratios similar to that of the mantle. This was also suggested by Hedge and Walthall6.
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References
Gast, P. W., J. Geophys. Res., 65, 1287 (1960).
Hurley, P. M., et al., NYO-3943, Tenth Ann. Prog. Rep. for 1962 (Mass. Inst. Tech.).
Hurley, P. M., et al., NYO-10,517, Eleventh Ann. Prog. Rep. for 1963 (Mass. Inst. Tech.).
Faure, G., and Hurley, P. M., J. Petrology, 4, 31 (1963).
Hamilton, E. I., Nature, 201, 599 (1964).
Hedge, C. E., and Walthall, F. G., Science, 140, 1214 (1963).
Barth, T. F. W., Geochim. Cosmochim. Acta, 23, 1 (1961).
Heier, K. S., Norg. Geol. Unders., 207, 246 (1960).
Heier, K. S., and Adams, J. A. S., Phys. and Chem. Earth, 5, 253 (in the press).
Hamilton, E. I., J. Petrology, 4, 383 (1963).
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HEIER, K. Rubidium/Strontium and Strontium-87/Strontium-86 Ratios in Deep Crustal Material. Nature 202, 477–478 (1964). https://doi.org/10.1038/202477a0
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DOI: https://doi.org/10.1038/202477a0
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