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High-precision Fe isotopic data for 104 samples, including modern and ancient (≥3.7Ga) subduction-related magmas and mantle peridotites, are presented. These data demonstrate that mid-ocean ridge and oceanic-island basalts (MORBs and OIBs) have on average small, but distinctly (~+0.06‰) higher 56 Fe/ 54 Fe ratios than both modern and Eoarchean boninites and many island arc basalts...
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