Redox control on nitrogen isotope fractionation during planetary core formation.

ABSTRACT: The present-day nitrogen isotopic compositions of Earth's surficial (¹⁵N-enriched) and deep reservoirs (¹⁵N-depleted) differ significantly. This distribution can neither be explained by modern mantle degassing nor recycling via subduction zones. As the effect of planetary differentiation on the behavior of N isotopes is poorly understood, we experimentally determined N-isotopic fractionations during metal-silicate partitioning (analogous to planetary core formation) over a large range of oxygen fugacities (ΔIW -3.1 < logfO₂ < ΔIW -0.5, where ΔIW is the logarithmic difference between experimental oxygen fugacity [fO₂] conditions and that imposed by the coexistence of iron and wüstite) at 1 GPa and 1,400 °C. We developed an in situ an

SUBMITTER: Dalou C 

PROVIDER: S-EPMC6642344 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature