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Nature 408, 657-659 (7 December 2000) | doi:10.1038/35047205
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Geochemistry: Mantle recycled in Sardinia
Barry B. Hanan
Abstract
The origin of the 'EM-1 signature' evident in certain basalt rocks is a long-standing puzzle. Comparison of data from Pitcairn Island and Sardinia may shed some light on the enigma.
Oceanic 'large igneous provinces' (LIPs) are areas of the sea floor where the ocean crust is especially thick —30 km or more. During the plate tectonic process of subduction along island arcs, when sea floor sinks back down into the mantle, LIPs are thought to remain at the surface because of their comparative buoyancy and to accrete to the continental crust.
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