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Article: Sedimentary sulfur isotopes and neoarchean ocean oxygenation

TitleSedimentary sulfur isotopes and neoarchean ocean oxygenation
Authors
Issue Date2018
Citation
Science Advances, 2018, v. 4, n. 1, article no. e1701835, p. 1-5 How to Cite?
AbstractCopyright © 2018 The Authors. Abrupt disappearance of mass-independent fractionation of sulfur isotopes (MIF-S) from the geologic record and an apparent ingrowth in seawater sulfate around 2.45 billion years ago (Ga) signal the first large-scale oxygenation of the atmosphere [the Great Oxygenation Event (GOE)]. Pre- GOE O2 production is evident from multiple other terrestrial and marine proxies, but oceanic O2 concentrations remain poorly constrained. Furthermore, current interpretations of S isotope records do not explain a concurrent expansion in the range of both MIF-S—diagnostic for low atmospheric O2—and d34S beginning at 2.7 Ga. To address these unknowns, we developed a reaction-transport model to analyze the preservation patterns of sulfur isotopes in Archean sedimentary pyrites, one of the most robust and widely distributed proxies for early Earth biogeochemistry. Our modeling, paradoxically, reveals that micromolar levels of O2 in seawater enhance the preservation of large MIF-S signals, whereas concomitant ingrowth of sulfate expands the ranges in pyrite d34S. The 2.7- to 2.45-Ga expansion in both D33S and d34S ranges thus argues for a widespread and protracted oxygenation of seawater, at least in shallow marine environments. At the micromolar levels predicted, the surface oceans would support a strong flux of O2 to the atmosphere, where O2 sinks balanced these fluxes until the GOE. This microoxic seawater would have provided habitat for early aerobic microorganisms and supported a diversity of new O2-driven biogeochemical cycles in the Neoarchean.
Persistent Identifierhttp://hdl.handle.net/10722/269655
ISSN
2017 Impact Factor: 11.511

 

DC FieldValueLanguage
dc.contributor.authorFakhraee, Mojtaba-
dc.contributor.authorCrowe, Sean A.-
dc.contributor.authorKatsev, Sergei-
dc.date.accessioned2019-04-30T01:49:12Z-
dc.date.available2019-04-30T01:49:12Z-
dc.date.issued2018-
dc.identifier.citationScience Advances, 2018, v. 4, n. 1, article no. e1701835, p. 1-5-
dc.identifier.issn2375-2548-
dc.identifier.urihttp://hdl.handle.net/10722/269655-
dc.description.abstractCopyright © 2018 The Authors. Abrupt disappearance of mass-independent fractionation of sulfur isotopes (MIF-S) from the geologic record and an apparent ingrowth in seawater sulfate around 2.45 billion years ago (Ga) signal the first large-scale oxygenation of the atmosphere [the Great Oxygenation Event (GOE)]. Pre- GOE O2 production is evident from multiple other terrestrial and marine proxies, but oceanic O2 concentrations remain poorly constrained. Furthermore, current interpretations of S isotope records do not explain a concurrent expansion in the range of both MIF-S—diagnostic for low atmospheric O2—and d34S beginning at 2.7 Ga. To address these unknowns, we developed a reaction-transport model to analyze the preservation patterns of sulfur isotopes in Archean sedimentary pyrites, one of the most robust and widely distributed proxies for early Earth biogeochemistry. Our modeling, paradoxically, reveals that micromolar levels of O2 in seawater enhance the preservation of large MIF-S signals, whereas concomitant ingrowth of sulfate expands the ranges in pyrite d34S. The 2.7- to 2.45-Ga expansion in both D33S and d34S ranges thus argues for a widespread and protracted oxygenation of seawater, at least in shallow marine environments. At the micromolar levels predicted, the surface oceans would support a strong flux of O2 to the atmosphere, where O2 sinks balanced these fluxes until the GOE. This microoxic seawater would have provided habitat for early aerobic microorganisms and supported a diversity of new O2-driven biogeochemical cycles in the Neoarchean.-
dc.languageeng-
dc.relation.ispartofScience Advances-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleSedimentary sulfur isotopes and neoarchean ocean oxygenation-
dc.typeArticle-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1126/sciadv.1701835-
dc.identifier.scopuseid_2-s2.0-85042256783-
dc.identifier.volume4-
dc.identifier.issue1-
dc.identifier.spagearticle no. e1701835, p. 1-
dc.identifier.epagearticle no. e1701835, p. 5-

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