Redox state of mantle wedge inferred from the mantle peridotites in the Oman ophiolite

Abstract

The redox state of mantle wedge was evaluated in the Fizh mantle section of Oman ophiolite. Using olivine and spinel delta log fO₂ (FMQ) was calculated with equations of Ballhaus et al. (1991). The results show more oxidizing on the eastern Moho side whereas more reducing on the western basal side. A negative correlation occurs between whole rock V/Sc ratio and delta log fO₂ (FMQ). The reduced signature in the basal part is explained by a reaction of peridotite with a reduced sediment melt.