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Geodynamics

The ups and downs of sediments

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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Figure 1: Oceanic crust (black line) collects sediment as it travels from the mid-oceanic ridge (A).

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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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