Source of Pitcairn Island basalts

Using sulfur isotope analyses and isotope modeling, researchers report that the basalts from Pitcairn Island and Seamounts, young volcanic edifices in the South Pacific that are less than a million years old, contain Archean sediments that are more than 2.45 billion years old, suggesting that the relic sediments in Pitcairn basalts remained chemically isolated in the Earth’s mantle for billions of years. - Read at PNAS.org

Article #15-23805: “Sulfur and lead isotopic evidence of relic Archean sediments in the Pitcairn mantle plume,” by Hélène Delavault, Catherine Chauvel, Emilie Thomassot, Colin Devey, and Baptiste Dazas.