Abstract
Sr and Nd isotope ratios are reported for 17 mid-ocean ridge basalts and for 11 oceanic islands and island groups. Data from the Azores, Samoa and the Society Islands diverge significantly from the mantle array. These results are not explained by binary mixing of depleted and undepleted mantle reservoirs or by variable magmatic depletion of a planetary reservoir, but support mantle evolution models involving re-injection of crust material into the mantle.
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White, W., Hofmann, A. Sr and Nd isotope geochemistry of oceanic basalts and mantle evolution. Nature 296, 821–825 (1982). https://doi.org/10.1038/296821a0
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DOI: https://doi.org/10.1038/296821a0
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