Neither recycled oceanic crust nor sediments alone can explain the composition of ocean-island basalts, but how about a mixture of the two? Recent modelling using the isotopes of hafnium and neodymium appears to support this contention.
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Plank, T., van Keken, P. The ups and downs of sediments. Nature Geosci 1, 17–18 (2008). https://doi.org/10.1038/ngeo.2007.68
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DOI: https://doi.org/10.1038/ngeo.2007.68