Europium in plagioclase-hosted melt inclusions reveals mantle melting modulates oxygen fugacity.

ABSTRACT: To gain insights into the composition and heterogeneity of Earth's interior, the partial pressure of oxygen (oxygen fugacity, or fO₂) in igneous rocks is characterized. A surprising observation is that relative to reference buffers, fO₂s of mantle melts (mid-ocean ridge basalts, or MORBs) and their presumed mantle sources (abyssal peridotites) differ. Globally, MORBs have near-uniform fO₂s, whereas abyssal peridotites vary by about three orders of magnitude, suggesting these intimately related geologic reservoirs are out of equilibrium. Here, we characterize fO₂s of mantle melting increments represented by plagioclase-hosted melt inclusions, which were entrapped as basaltic melts migrated from their sources toward the seafloor. At temperatures an

SUBMITTER: Dygert N 

PROVIDER: S-EPMC11001916 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature