Relationship between the redox state in the early stage of arc mantle and flux melting observed in the Oman mantle peridotite

Abstract

The V/Sc and Zn/Fe ratios of the harzburgite in the mantle section of the Oman ophiolite show a good negative and positive correlation with delta logfO2 (FMQ) of each peridotite. The amount of REE in these peridotite rocks tends to be higher as the amount of La is higher and the amount of Yb is lower in the more oxidative sample. This relationship may reflect the result of flux melting in the mantle wedge. H2O-rich fluid originally flowed into the reductive mantle wedge from the subducted slab, causing flux melting and recording the oxidative state in the residual harzburgite.