Study reveals heterogeneous mantle source compositions for boninite from Bonin and Troodos

Tuesday, June 6, 2023 - 11:53 in Earth & Climate

Subduction-zone magmas are characterized by high fluid contents and Fe3+/ΣFe ratios, which are closely associated with slab-derived fluids during subduction. However, instead of a heavier iron isotope composition preferred under an oxidized state, arc magmas have lighter iron isotope compositions than seafloor basalts, including mid-ocean ridge basalts (MORB) and oceanic island basalts (OIB).

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