Sulfur mass-independent fractionation(S-MIF)preserved in Archean sedimentary pyrite is interpreted to reflect atmospheric chemistry.Small ranges in △33S that expanded into larger fractionations leading up to the Great Oxygenation Event(GOE;2.45-2.2 Ga)are disproportionately represented by sequences from the Kaapvaal and Pilbara Cratons.These patterns of S-MIF attenuation and enhancement may differ from the timing and magnitude of minor sulfur isotope fractionations reported from other cratons,thus obscuring local for global sulfur cycling dynamics.By expanding the △33S record to include the relatively underrepresented S?o Francisco Craton in Brazil,we suggest that marine biogeochemistry affected S-MIF preservation prior to the GOE.In an early Neoarchean sequence(2763-2730 Ma)from the Rio das Velhas Greenstone Belt,we propose that low δ13Corg(＜-30‰)and dampened △33S(0.4‰ to-0.7‰)in banded iron formation reflect the marine diagenetic process of anaerobic methane oxidation.The overlying black shale(TOC up to 7.8％)with higher δ13Corg(-33.4‰ to-19.2％)and expanded △33S(2.3‰±0.8‰),recorded oxidative sulfur cycling that resulted in enhance preservation of S-MIF input from atmospheric sources of elemental sulfur.The sequence culminates in a metasandstone,where concomitant changes to more uniform δ13Corg(-30‰ to-25‰),potentially associated with the RuBisCO I enzyme,and near-zero△33S(-0.04‰ to 0.3 8‰)is mainly interpreted as evidence for local oxygen production.When placed in the context of other sequences worldwide,the Rio das Velhas helps differentiate the influences of global atmospheric chemistry and local marine diagenesis in Archean biogeochemical processes.Our data sug-gest that prokaryotic sulfur,iron,and methane cycles might have an underestimated role in pre-GOE sul-fur minor isotope records.

Alice Bosco-Santos;William Patrick Gilhooly;Paola de Melo-Silva;Fotios Fouskas;Amaury Bouyon;Jo?o Gabriel Motta;Mauricio Rigoni Baldim;Wendell Fabricio-Silva;Pascal Philippot;Elson Paiva Oliveira

Department of Geology and Natural Resources,University of Campinas,Campinas,SP 13083855,Brazil;Department of Earth Sciences,Indiana University-Purdue University Indianapolis,Indianapolis,IN,USA;Institut de Physique du Globe de Paris,Université de Paris,CNRS-UMR 7154,75005 Paris Cedex 05,France;Vizlab-X-Reality and Geolnformatics Lab,UNISINOS,S?o Leopoldo,RS 93022-750,Brazil;Geosciences Department,Federal University of Mato Grosso,Cuiabá,MT,Brazil;Geosciences Institute,University of Brasilia,Brasilia,Distrito Federal 70910-900,Brazil;Institute of Geography and Geology,University of Würzburg,97074 Würzburg,Germany;Géosciences Montpellier,Université de Montpellier,CNRS,Université des Antilles,Montpellier,France;Institute of Astronomy,Geophysics,and Atmospheric Sciences,University of S?o Paulo,Rua do Mat?o 1226,S?o Paulo,Brazil

地学前缘（英文版）

[1]Alice Bosco-Santos;William Patrick Gilhooly;Paola de Melo-Silva;Fotios Fouskas;Amaury Bouyon;Jo?o Gabriel Motta;Mauricio Rigoni Baldim;Wendell Fabricio-Silva;Pascal Philippot;Elson Paiva Oliveira-.Neoarchean atmospheric chemistry and the preservation of S-MIF in sediments from the S?o Francisco Craton)[J].地学前缘（英文版）,2022(05):207-226

33S,Kaapvaal,Pilbara,Cratons,Velhas,Greenstone,culminates,metasandstone,RuBisCO

Neoarchean,atmospheric,preservation,MIF,sediments,from,Francisco,Sulfur,mass,independent,preserved,Archean,sedimentary,pyrite,interpreted,reflect,Small,ranges,that,expanded,into,larger,fractionations,leading,up,Great,Oxygenation,Event,GOE,Ga,are,disproportionately,by,sequences,These,patterns,attenuation,enhancement,may,timing,magnitude,minor,sulfur,isotope,reported,other,cratons,thus,obscuring,local,global,cycling,dynamics,By,expanding,include,relatively,underrepresented,Brazil,we,suggest,marine,biogeochemistry,affected,prior,In,early,Ma,Rio,das,Belt,propose,low,13Corg,dampened,banded,iron,formation,diagenetic,anaerobic,methane,oxidation,overlying,black,shale,TOC,higher,recorded,oxidative,resulted,input,sources,elemental,where,concomitant,changes,more,uniform,potentially,associated,enzyme,near,zero,mainly,evidence,oxygen,production,When,placed,context,worldwide,helps,differentiate,influences,diagenesis,biogeochemical,processes,Our,data,prokaryotic,cycles,might,have,underestimated,role,records

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