Biogeochemical cycling of iron is crucial to many environmental processes, such as ocean
productivity, carbon storage, greenhouse gas emissions and the fate of nutrients, toxic …

Iron is the most abundant redox‐active metal in the Earth's crust. The one electron transfer
between the two most common redox states, Fe (II) and Fe (III), plays a role in a huge range …

Iron formations (IF) represent an iron-rich rock type that typifies many Archaean and
Proterozoic supracrustal successions and are chemical archives of Precambrian seawater …

Pyrite, or iron disulfide, is the most common sulfide mineral on the Earth's surface and is
widespread through the geological record. Because sulfides are mainly produced by sulfate …

Light energy is a driver for many biogeochemical element cycles in aquatic systems. The
sunlight-induced photochemical reduction of ferric iron (Fe (III) photoreduction) to ferrous …

Most manganese (Mn) enrichments in the sedimentary rock record are hosted in carbonate
minerals, which are assumed to have formed by diagenetic reduction of precursor Mn …

Anoxic and iron-rich (ferruginous) conditions prevailed in the ocean under the low-oxygen
atmosphere that occurred through most of the Archean Eon. While euxinic conditions (ie …

Because of recent advances in omics methodologies, knowledge of chlorophototrophy (ie,
chlorophyll-based phototrophy) in bacteria has rapidly increased. Chlorophototrophs …

The emergence of oxygenic photosynthesis created a new niche with dramatic potential to
transform energy flow through Earth's biosphere. However, more primitive forms of …

Microbial denitrification converts fixed nitrogen species into gases in extant oceans.
However, it is unclear how such transformations occurred within the early nitrogen cycle of …