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

Stable isotope studies of sulfate minerals are especially useful for unraveling the
geochemical history of geological systems. All sulfate minerals can yield sulfur and oxygen …

Sulfate reduction and anaerobic methane oxidation are the dominant microbial processes
occurring in hydrate-bearing sediments at bathyal depths in the Gulf of Mexico where crude …

Oxygen isotope exchange rate between dissolved sulfate and water was experimentally
determined at 100, 200 and 300° C. The isotope exchange rate is strongly dependent on …

Bacterial disproportionation of elemental sulfur is an important process in the sulfur cycle of
natural sediments and leads to the formation of hydrogen sulfide and sulfate. The oxygen …

We present new sulfur and oxygen isotope data in sulfate (δ 34 S SO 4 and δ 18 O SO 4,
respectively), from globally distributed marine and estuary pore fluids. We use this data with …

Comparison of experimental and field data indicates that the dominant controls of the δ18O
of environmental SO42-(aq) are S redox reactions, and δ18O of ambient H2O. Several other …

Seawater was evaporated, stepwise isothermally at 23.5° C, for 73 days, up to a degree of
evaporation of 138× by H 2 O weight. At various stages of evaporation the precipitate was …

Sulfur cycling in Fe-poor, organic-rich shelf carbonates, known to have rapid rates of SO4− 2
reduction, remains poorly studied despite the volumetric significance of shelf deposits in …

Interstitial waters from eleven sites of the Eastern Mediterranean Basin (Sites 963–973)
were analyzed for stable isotopes of dissolved sulfate (δ34S, δ18O) and major and minor …