Iron isotope fractionation at the core–mantle boundary by thermodiffusion

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...

Iron isotope fractionation by Fe(II)-oxidizing photoautotrophic bacteria

Photoautotrophic bacteria that oxidize ferrous iron (Fe[II]) under anaerobic conditions are thought to be ancient in origin, and the ferric (hydr)oxide mineral products of their metabolism are likely to be preserved in ancient rocks. Here, two enrichment cultures of Fe(II)-oxidizing photoautotrophs and a culture of the genus Thiodictyon were studied with respect to their ability to fractionate ...

Iron and oxygen isotope fractionation during photo-oxidation

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Diffusion-driven magnesium and iron isotope fractionation in Hawaiian olivine

Iron Isotope Fractionation in Zoned Carbonates from Alh84001

Introduction: The chemically and mineralogically zoned carbonates within the oldest martian meteorite, ALH84001 (a coarse grained orthopyroxenite) have been the subject of intense study [1-9] since McKay et al [3] suggested that they may contain evidence for life. Whilst these studies have revealed a convoluted history, there remains no consensus on the mechanism and temperature of carbonate fo...