KEY WORDS: mantle peridotites; mantle melting; supra-subduction zone; magnetite-quartz) -1•1 (log units) and FMQ + 0•4 which ODP Leg 125; Izu-Bonin-Mariana forearc overlap those of mid-ocean ridge basalt (MORB) peridotites.Dunites from Conical Seamount contain small amounts of clinopyroxene, orthopyroxene and amphibole and are light REE (LREE) enriched.Moreover, they are considerably more oxidized than the harzburgites
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Parkinson et al. (1998) studied this question.