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Multiple sulfur isotopes and the evolution of the atmosphere
Observation of wavelength‐sensitive mass‐independent sulfur isotope effects during SO2 photolysis: Implications for the early atmosphere
Mass-independent isotopic signatures for δ 33 S, δ 34 S, and δ 36 S produced in the photolysis of sulfur dioxide exhibit a strong wavelength dependence. Photolysis experiments with three light…
Isotopic evidence for Mesoarchaean anoxia and changing atmospheric sulphur chemistry
The findings point to the persistence of an anoxic early atmosphere, and identify variability within the isotope record that suggests changes in pre-2.45-Gyr-ago atmospheric pathways for non-mass-dependent chemistry and in the ultraviolet transparency of an evolving early atmosphere.
Mass-dependent fractionation of quadruple stable sulfur isotope system as a new tracer of sulfur biogeochemical cycles
Late Archean Biospheric Oxygenation and Atmospheric Evolution
The correlation of the time-series sulfur isotope signals in northwestern Australia with equivalent strata from South Africa suggests that changes in the exogenic sulfur cycle recorded in marine sediments were global in scope and were linked to atmospheric evolution.
A Whiff of Oxygen Before the Great Oxidation Event
S values, which is comparable with uncertainties based on multiple standard measurements during each analytical session. For SF6 analyses, uncertainties are 0.14, 0.008, and 0.20‰ for d 34 S, D 33 S,…
Early Archaean Microorganisms Preferred Elemental Sulfur, Not Sulfate
- P. Philippot, M. V. van Zuilen, K. Lepot, C. Thomazo, J. Farquhar, M. V. Van Kranendonk
- 14 September 2007
It is shown that microscopic sulfides with low 34S/32S ratios in marine sulfate deposits from the Dresser Formation, Australia have a mass-independently fractionated sulfur isotopic anomaly (Δ33S) that differs from that of their host sulfate (barite).
Animal evolution, bioturbation, and the sulfate concentration of the oceans
- D. Canfield, J. Farquhar
- Environmental Science, GeographyProceedings of the National Academy of Sciences
- 19 May 2009
The evolution of bioturbation is linked to the significant deposition of sulfate evaporate minerals, which is largely a phenomena of the Phanerozoic, the last 542 million years and the time over which animals rose to prominence.
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…
Geological constraints on the origin of oxygenic photosynthesis
The geological evidence for early oxygen and hypotheses for the controls on oxygen level are the basis for the interpretation of photosynthetic oxygen production as examined in this review.