Latitude-dependent oxygen fugacity in arc magmas.

ABSTRACT: The redox state of arc mantle has been considered to be more oxidized and diverse than that of the mid-ocean ridge, but the cause of the variation is debated. We examine the redox state of the Cenozoic global arc mantle by compiling measured/calculated fO₂ of olivine-hosted melt inclusions from arc magma and modeled fO₂ based on V/Sc and Cu/Zr ratios of arc basaltic rocks. The results indicate that the redox state of Cenozoic arc mantle is latitude dependent, with less oxidized arc mantle in the low latitudes, contrasting with a near constant across-latitude trend in the mid-ocean ridges. We propose that such a latitude-dependent pattern in the arc mantle may be controlled by the variation in the redox state of subducted sediment, possibly related to a latitudinal var

SUBMITTER: Hu F 

PROVIDER: S-EPMC11258285 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature