Upper mantle control on the W isotope record of shallow level plume and intraplate volcanic settings

• First 182 W data on continental intraplate volcanic rocks. No anomalies in shallow mantle plumes. tungsten isotope the proto-Iceland plume. indicates heterogenous source composition for La Réunion. Several studies have revealed small heterogeneities relative abundance of W, radiogenic nuclide short-lived Hf (t 1/2 = ∼9 Ma), terrestrial Whereas majority Archean rocks display excesses to bulk silicate Earth, many young ocean island basalts show deficits, particular if they are sourced from deep-rooted The origin this anomaly is still ambiguous, proposed models focus core-mantle interaction or presence reservoirs lower that been isolated since Hadean. In order evaluate role upper reservoirs, we report first where a deep plume debated (Ascension Island, Massif Central, Siebengebirge and Eifel) associated with either subduction zone environments (Italian Magmatic Provinces) compare them new (La Réunion Baffin Island). Island uniform modern mantle-like μ around 0 despite extremely high ( 3 He/ 4 He). contrast, both edifices span range values deficits as low −8.8 ppm, indicating heterogeneous reservoir. all other provinces overlap within ppm. absence resolvable these basalts, which partially tap lithospheric mantle, suggests primordial components neither present central southern European lithosphere nor asthenospheric reservoir (EAR). general plume-related can be explained by isotopically anomalous domains beneath northern hemisphere, also suggested geophysical evidence.