Oxygenic photosynthesis is arguably the most important biological innovation in Earth's
history, facilitating the transition to a habitable planet for complex life. Dating the emergence …

Although biomineralization of CaCO 3 is widespread in Bacteria and Archaea, the molecular
mechanisms involved in this process remain less known than those used by Eukaryotes. A …

Precipitation of methane-derived authigenic carbonates (MDAC) is an integral part of marine
methane production and consumption, but MDAC's relative significance to the global marine …

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 …

It is generally accepted that photosynthetic marine planktonic bacteria were responsible for
the oxidation of dissolved ferrous iron (Fe (II)) and the subsequent deposition of iron …

It is not well understood how, in the immediate aftermath of the Sturtian Snowball Earth,
marine sulfur cycling resulted in a global distribution of sedimentary pyrite with δ 34 S values …

The strongly 13 C-depleted calcite in the Doushantuo cap dolostones (∼ 635 Ma) of South
China is considered to form via thermochemical or biological oxidation of methane by sulfate …

Many manganese (Mn) carbonate deposits over geologic history are often closely
associated with black shales. However, the mechanism (s) by which the Mn entered the …

In order to explore Cryogenian seawater chemistry and its underlying controls, we present
an integrated study of iron speciation, major and trace elements, and carbon isotopes of Mn …

The oxidation states of manganese minerals in the geological record have been interpreted
as proxies for the evolution of molecular oxygen in the Archean eon. Here we report that an …