Cycling of redox-sensitive elements such as Fe is affected by not only ambient EhpH
conditions, but also by a significant biomass that may derive energy through changes in …

Interpretation of the origins of iron-bearing minerals preserved in modern and ancient rocks
based on measured iron isotope ratios depends on our ability to distinguish between …

The largest Fe isotope fractionations occur during redox changes, as well as differences in
bonding, but these are expressed only in natural environments in which significant …

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 …

The inventories and Fe isotope composition of aqueous Fe (II) and solid‐phase Fe
compounds were quantified in neutral‐pH, chemically precipitated sediments downstream of …

Iron isotope fractionations produced during chemical and biological Fe (II) oxidation are
sensitive to the proportions and nature of dissolved and solid-phase Fe species present, as …

Iron is a remarkable element in its relatively high abundance for its mass and its sensitivity to
(and control of) redox on a planetary scale over geologic time. Numerous volumes have …

Much interest exists in finding mineralogical, organic, morphological, or isotopic
biosignatures for Fe (II)-oxidizing bacteria (FeOB) that are retained in Fe-rich sediments …

Field and laboratory studies reveal that the mineral ferrihydrite, formed as a result of abiotic
oxidation of aqueous ferrous to ferric Fe, contains Fe that is isotopically heavy relative to …

Iron is a redox-sensitive element. It forms poorly soluble iron oxyhydroxides in the presence
of O2, poorly soluble iron sulfides in the presence of dissolved sulfide, but soluble Fe (II) …