Atmospheric influence of Earth's earliest sulfur cycle

  title={Atmospheric influence of Earth's earliest sulfur cycle},
  author={Farquhar and Bao and Thiemens},
  volume={289 5480},
Mass-independent isotopic signatures for delta(33)S, delta(34)S, and delta(36)S from sulfide and sulfate in Precambrian rocks indicate that a change occurred in the sulfur cycle between 2090 and 2450 million years ago (Ma). Before 2450 Ma, the cycle was influenced by gas-phase atmospheric reactions. These atmospheric reactions also played a role in determining the oxidation state of sulfur, implying that atmospheric oxygen partial pressures were low and that the roles of oxidative weathering… 

Five-S-isotope evidence of two distinct mass-independent sulfur isotope effects and implications for the modern and Archean atmospheres

The authors' quadruple stable sulfur isotopic measurements in varying coal samples and in SO2 emitted from combustion display normal 33S and 36S, indicating that the observed negative 36S anomalies originate from a previously unknown S-MIF mechanism during combustion (likely recombination reactions) instead of coal itself.

Anomalous fractionation of mercury isotopes in the Late Archean atmosphere

It is found that biogenic methane and volcanic emissions played a vital role in the reduced Late Archean atmosphere, with mercury (Hg) stable isotopes as a proxy for paleoatmospheric chemistry.

Anomalous Fractionations of Sulfur Isotopes During Thermochemical Sulfate Reduction

Results suggest that reactions between organic matter in sediments and sulfate-rich hydrothermal solutions may have produced anomalous sulfur isotope signatures in some sedimentary rocks, and may be linked to the biological and thermal evolution of Earth in ways different than previously thought.

Explaining the Structure of the Archean Mass-Independent Sulfur Isotope Record

Using an integrated biogeochemical model of the Archean sulfur cycle, it is found that the preservation of mass-independent sulfur is influenced by a variety of extra-atmospheric mechanisms, including biological activity and continental crust formation.

A seawater-sulfate origin for early Earth’s volcanic sulfur

  • H. Ohmoto
  • Geology, Environmental Science
    Nature Geoscience
  • 2020
Mass-independent fractionation of sulfur isotopes (MIF-S)—as recorded primarily in pre-2.5 billion years ago (Ga) sedimentary rocks—has been interpreted as evidence of photolysis of volcanic SO2 in

Mass-independent sulfur isotope fractionation during photochemistry of sulfur dioxide

Mass-independent sulfur isotope signatures are observed in Archean and early Paleoproterozoic sedimentary sulfate and sulfide minerals, and provide the most robust constraints on early atmospheric

Riverine evidence for isotopic mass balance in the Earth’s early sulfur cycle

During a time of negligible atmospheric pO2, Earth’s early sulfur cycle generated a spectacular geological signal seen as the anomalous fractionation of multiple sulfur isotopic ratios. The

Mass-independent fractionation of sulfur isotopes in Archean sediments: strong evidence for an anoxic Archean atmosphere.

It is concluded that the atmospheric O2 concentration must have been < 10(-5) PAL prior to 2.3 Ga, which would have meant that all sulfur-bearing species would have passed through the oceanic sulfate reservoir before being incorporated into sediments, so any signature of MIF would have been lost.

Reconstructing Earth's surface oxidation across the Archean-Proterozoic transition

The Archean-Proterozoic transition is characterized by the widespread deposition of organic-rich shale, sedimentary iron formation, glacial diamictite, and marine carbonates recording profound carbon



Iron and sulfur in the pre-biologic ocean.

Sulfur isotopic composition of cenozoic seawater sulfate

A comparison between seawater sulfate and marine carbonate carbon isotope records reveals no clear systematic coupling between the sulfur and carbon cycles over one to several millions of years, indicating that changes in the burial rate of pyrite sulfur and organic carbon did not singularly control the atmospheric oxygen content over short time intervals in the Cenozoic.

Oxygen cycle of the Martian atmosphere‐regolith system: Δ17O of secondary phases in Nakhla and Lafayette

Oxygen isotope fractionations among silicates, carbonates, and sulfate from Nakhla and Lafayette can be used to resolve how multiple oxygen isotope reservoirs formed and evolved on Mars and to gain

3.4-Billion-year-old biogenic pyrites from Barberton, South Africa: sulfur isotope evidence.

Analysis of sulfur isotopic compositions of microscopic-sized grains of pyrite show that by about 3.4 billion years ago sulfate-reducing bacteria had become active, the oceans were rich in sulfate, and the atmosphere contained appreciable amounts of the present atmospheric level of free oxygen.

Carbon and sulfur isotope abundances in Archean iron-formations and early Precambrian life

The volcanically enclosed Michipicoten and Woman River iron-formations, both approximately 2.75 b.y. old, in Superior Province of the Canadian Shield lie at lithologically similar stratigraphic

Mass-independent isotope effects in planetary atmospheres and the early solar system.

Observed mass-independent meteoritic oxygen and sulfur isotopic compositions may derive from chemical processes in the presolar nebula, and their distributions could provide insight into early solar system evolution.

Evidence of atmospheric sulphur in the martian regolith from sulphur isotopes in meteorites

Measurements of sulphur isotopes in oxidized and reduced phases from the SNC meteorites are presented together with the results of laboratory photolysis studies of two important martian atmospheric sulphur species (SO2 and H2S), which identify a mechanism for producing large abiogenic 34S fractionations in the surface sulphur reservoirs.

Early Organic Evolution: Implications for Mineral and Energy Resources

This volume presents both an overview and final synopsis of the work performed between 1978-1989 by an international task force of geologists, geochemists, and paleontologists rallied around the