Trace element partitioning in basaltic systems as a function of oxygen fugacity.

ABSTRACT: Along with temperature, pressure and melt chemistry, magmatic oxygen fugacity (fO₂) has an important influence on liquid and solid differentiation trends and melt structure. To explore the effect of redox conditions on mineral stability and mineral-melt partitioning in basaltic systems we performed equilibrium, one-atmosphere experiments on a picrite at 1200-1110 °C with fO₂ ranging from NNO-4 log units to air. Clinopyroxene crystallizes from 1180 °C to near-solidus, along with plagioclase, olivine and spinel. Olivine Mg# increases with increasing fO₂, eventually reacting to pigeonite. Spinel is absent under strongly reducing conditions. Mineral-melt partition coefficients (D) of redox-sensitive elements (Cr, Eu, V, Fe) vary syst

SUBMITTER: Leuthold J 

PROVIDER: S-EPMC11008077 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature