Comment on "Iron Isotope Constraints on the Archean and Paleoproterozoic Ocean Redox State"

Yamaguchi, Kosei; Ohmoto, Hiroshi

doi:10.1126/science.1118221

Cited by 15 publications

(5 citation statements)

References 4 publications

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“…In this context, partial oxidation associated with BIF precipitation would have left a residue of isotopically light Fe(II) aq (<À0.15‰/amu). Yamaguchi and Ohmoto (2006) and Archer and Vance (2006) questioned this interpretation and suggested instead that the light Fe isotopic compositions measured in >2.3 Ga pyrite grains reflect microbial cycling of Fe in the sediment by dissimilatory iron reduction (however, see Rouxel et al, 2006). Studies of shallow sediment profiles (Severmann et al, 2006;Staubwasser et al, 2006) have shown that such redox cycling does occur in present-day sediments, producing Fe(II) aq in porewaters with F Fe as low as À1.5‰/amu.…”

Section: The Fe Isotopic Composition Of Eoarchean Seawatermentioning

confidence: 89%

Iron isotope, major and trace element characterization of early Archean supracrustal rocks from SW Greenland: Protolith identification and metamorphic overprint

Dauphas

Zuilen

Busigny

et al. 2007

Geochimica et Cosmochimica Acta

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Section: The Fe Isotopic Composition Of Eoarchean Seawatermentioning

confidence: 89%

Iron isotope, major and trace element characterization of early Archean supracrustal rocks from SW Greenland: Protolith identification and metamorphic overprint

Dauphas

Zuilen

Busigny

et al. 2007

Geochimica et Cosmochimica Acta

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“…The present continental flux of Mo, like that of Re and Os, is largely derived from organic matter-rich sulfidic shales; at the time of the GOE, the pre-GOE organic matter-rich sulfidic shales were not significantly enriched in Mo above crustal levels (Holland 2004;Yamaguchi 2002;Scott et al 2008). The predominant crustal reservoir of Mo that oxidized to form molybdate at this time would have been crystalline crustal rocks with generally low Mo content.…”

Section: Molybdenum Concentrations In Euxinic Shalesmentioning

confidence: 97%

Geological constraints on the origin of oxygenic photosynthesis

2010

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This article examines the geological evidence for the rise of atmospheric oxygen and the origin of oxygenic photosynthesis. The evidence for the rise of atmospheric oxygen places a minimum time constraint before which oxygenic photosynthesis must have developed, and was subsequently established as the primary control on the atmospheric oxygen level. The geological evidence places the global rise of atmospheric oxygen, termed the Great Oxidation Event (GOE), between ~2.45 and ~2.32 Ga, and it is captured within the Duitschland Formation, which shows a transition from mass-independent to mass-dependent sulfur isotope fractionation. The rise of atmospheric oxygen during this interval is closely associated with a number of environmental changes, such as glaciations and intense continental weathering, and led to dramatic changes in the oxidation state of the ocean and the seawater inventory of transition elements. There are other features of the geologic record predating the GOE by as much as 200-300 million years, perhaps extending as far back as the Mesoarchean-Neoarchean boundary at 2.8 Ga, that suggest the presence of low level, transient or local, oxygenation. If verified, these features would not only imply an earlier origin for oxygenic photosynthesis, but also require a mechanism to decouple oxygen production from oxidation of Earth's surface environments. Most hypotheses for the GOE suggest that oxygen production by oxygenic photosynthesis is a precondition for the rise of oxygen, but that a synchronous change in atmospheric oxygen level is not required by the onset of this oxygen source. The potential lag-time in the response of Earth surface environments is related to the way that oxygen sinks, such as reduced Fe and sulfur compounds, respond to oxygen production. Changes in oxygen level imply an imbalance in the sources and sinks for oxygen. Changes in the cycling of oxygen have occurred at various times before and after the GOE, and do not appear to require corresponding changes in the intensity of oxygenic photosynthesis. The available geological constraints for these changes do not, however, disallow a direct role for this metabolism. 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.

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“…doi:10. 1016/j.gca.2008.04.035 Mars, and the mobility of a host of contaminants in modern earth settings (Straub et al, 2001;Benison and LaClair, 2003;Edwards et al, 2004;Emerson and Weiss, 2004;Kappler and Newman, 2004;Roden et al, 2004;Ferris, 2005;Kump and Seyfried, 2005;Rouxel et al, 2005;Rouxel et al, 2006;Yamaguchi and Ohmoto, 2006;Stucki et al, 2007;Neubauer et al, 2008). In any of these environments geochemical control on microbial ecology can be manifested in diverse ways, but one key factor is to consider the rates at which organisms can utilize existing substrates including electron donors and acceptors to garner energy for growth.…”

Section: Introductionmentioning

confidence: 99%

Low-oxygen and chemical kinetic constraints on the geochemical niche of neutrophilic iron(II) oxidizing microorganisms

Druschel

Emerson

Sutka

et al. 2008

Geochimica et Cosmochimica Acta

204

200

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Comment on "Iron Isotope Constraints on the Archean and Paleoproterozoic Ocean Redox State"

Cited by 15 publications

References 4 publications

Iron isotope, major and trace element characterization of early Archean supracrustal rocks from SW Greenland: Protolith identification and metamorphic overprint

Iron isotope, major and trace element characterization of early Archean supracrustal rocks from SW Greenland: Protolith identification and metamorphic overprint

Geological constraints on the origin of oxygenic photosynthesis

Low-oxygen and chemical kinetic constraints on the geochemical niche of neutrophilic iron(II) oxidizing microorganisms

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