Rita Cabral – First Author In Nature Paper

in 2013, 2013, August-13, Graduate students, Publications
August 19th, 2013

Anomalous Sulphur Isotopes in Plume Lavas Reveal Deep Mantle Storage of Archaean Crust

Basaltic lavas erupted at some oceanic intraplate hotspot volcanoes are thought to sample ancient subducted crustal materials1, 2. However, the residence time of these subducted materials in the mantle is uncertain and model-dependent3, and compelling evidence for their return to the surface in regions of mantle upwelling beneath hotspots is lacking. Here we report anomalous sulphur isotope signatures indicating mass-independent fractionation (MIF) in olivine-hosted sulphides from 20-million-year-old ocean island basalts from Mangaia, Cook Islands (Polynesia), which have been suggested to sample recycled oceanic crust3, 4. Continue reading at Nature.com…