Add to ORKGInternational audienceHotspot lavas show a large diversity of isotope compositions resulting from the recycling of surface material into the convective mantle. Amongst the mantle end-members, EM-1 (enriched mantle) is widely debated and scenarios involving either old pelagic sediments subducted into the deep mantle or subcontinental lithospheric material incorporated at shallow depths are commonly evoked. The aim of the present study is to combine the measurement of Rare Earth Elements (REE) and of several isotope systems (147Sm-143Nd, 176Lu-176Hf, 138La-138Ce) in order to better understand the origin of the EM1 component. The use of the 138La-138Ce isotope systematics (T1/2 = 292.5 Ga; Tanimizu, Phys. Rev 2000) is particularly well adapted...