Nitrogen isotope fractionation during terrestrial core-mantle separation

Equilibrium iron isotope fractionation at core-mantle boundary conditions.

The equilibrium iron isotope fractionation between lower mantle minerals and metallic iron at core-mantle boundary conditions can be evaluated from the high-pressure 57Fe partial vibrational density of states determined by synchrotron inelastic nuclear resonant x-ray scattering spectroscopy using a diamond anvil. Ferropericlase [(Mg,Fe)O] and (Fe,Mg)SiO3- post-perovskite are enriched in heavy i...

Isotope Effects, Isotope Separation and Isotope Fractionation

Nitrogen isotope dynamics and fractionation

Introduction Conclusions References

Silicon Mantle/core Fractionation and the Origin

Experimentally determined metal/olivine partition coefficients and diffusion rates will help answer questions relating to Earth's elevated Mg/Si ratio and will provide better tools for the determination of the origin of pallasites. It is known that the Mg/Si ratio of the Earth's primitive upper mantle (PUM) is elevated relative to all types of chondrites (possibly not CV chondrites), Mars, and ...

Aphids alter host-plant nitrogen isotope fractionation.

Plant sap-feeding insects and blood-feeding parasites are frequently depleted in (15)N relative to their diet. Unfortunately, most fluid-feeder/host nitrogen stable-isotope studies simply report stable-isotope signatures, but few attempt to elucidate the mechanism of isotopic trophic depletion. Here we address this deficit by investigating the nitrogen stable-isotope dynamics of a fluid-feeding...