The sulfur biogeochemical cycle integrates the metabolic activity of multiple microbial
pathways (eg, sulfate reduction, disproportionation, and sulfide oxidation) along with abiotic …

The origin of oxygenic photosynthesis was the most important metabolic innovation in Earth
history. It allowed life to generate energy and reducing power directly from sunlight and …

Transient appearances of oxygen have been inferred before the Great Oxygenation Event
(GOE)[∼ 2.3 billion years (Ga) ago] based on redox-sensitive elements such as Mo and S …

In the low-oxygen Archean world (> 2400 million years ago), seawater sulfate
concentrations were much lower than today, yet open questions frustrate the translation of …

We present a quantitative model for sulfur isotope fractionation accompanying bacterial and
archaeal dissimilatory sulfate respiration. By incorporating independently available …

Persistent anoxia and the lack of a skeletal silica sink through the Precambrian would have
promoted a variety of reactions between iron and dissolved silica through much of Earth's …

Abstract The Proterozoic Eon spans Earth's middle age during which many important
transitions occurred. These transitions include the oxygenation of the atmosphere …

The marine sulfate inventory represents the largest standing pool of electron acceptors,
which, via microbial sulfate reduction, is responsible for roughly half of the organic matter …

Studies of microbial sulfate reduction have suggested that the magnitude of sulfur isotope
fractionation varies with sulfate concentration. Small apparent sulfur isotope fractionations …

Mass-independent fractionation of sulfur isotopes (MIF-S) in Archaean sediments results
from photochemical processing of atmospheric sulfur species in an oxygen-depleted …