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Peridotites dredged from mid-ocean ridges and glassy mid-ocean ridge basalts (MORB) transmit information about the oxygen fugacity  f  o 2  ) of Earth’s convecting upper mantle to the surface. Equilibrium assemblages of olivine+orthopyroxene+spinel in abyssal peridotites and Fe 3+ /ΣFe ratios in MORB glasses measured by X-ray absorption near-edge structure (XANES) provide independent estimates of MORB source region  f  o 2  , with the former recording  f  o 2   approximately 0.8 log units lower than the latter relative to the quartz-fayalite-magnetite (QFM) buffer. To test cross-compatibility of these oxybarometers and examine the compositional effects of changing  f  o 2   on a peridotite plus melt system over a range of Earth-relevant  f  o 2  , we performed a series of experiments at 0.1 MPa and  f  o 2   controlled by CO-CO 2  gas mixes between QFM-1.87 and QFM+2.23 in a system containing basaltic andesite melt saturated in olivine, orthopyroxene, and spinel

american mineralogist

Experimental investigation of basalt and peridotite oxybarometers: Implications for spinel thermodynamic models and Fe 3+  compatibility during generation of upper mantle melts