Study reveals low-degree melt metasomatic origin of heavy Fe isotope enrichment in mid-ocean ridge basalt mantle
(a) Histogram of δ56Fe of OH-1 MORB lavas, compared with the available global MORB data from ridges far from hotspots (Weyer and Ionov, 2007; Teng et al., 2013; Nebel et al., 2013; Chen et al., 2019; Sun et al., 2020; Richter et al., 2021) and ridges influenced by mantle plumes (Gleeson et al., 2020); (b) δ56Fe vs. Mg# diagram for OH-1 MORB lavas. (c) Histogram of so-far available global MORB δ56Fe data to show remarkable similarity to those of OIB in…