Once subducted into the mantle, material from Earth's continental crust seems to disappear. But its distinctive isotopic signature has been found back at the surface — in volcanic rocks on a Pacific island.
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Hofmann, A. The lost continents. Nature 448, 655–656 (2007). https://doi.org/10.1038/448655a
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DOI: https://doi.org/10.1038/448655a
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