Data/hora: 17/06/2024 00:27:34

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Triple iron isotope constraints on the role of ocean iron sinks in early atmospheric oxygenation
Autores: | Heard, Andy W.; Dauphas, Nicolas; Guilbaud, Romain; Rouxel, Olivier; Butler, Ian B.; Nie, Nicole X.; Bekker, Andrey.
Data: | 2020-10
Ano: | 2020
Resumo: | The role that iron played in the oxygenation of Earth's surface is equivocal. Iron could have consumed molecular oxygen when Fe3+-oxyhydroxides formed in the oceans, or it could have promoted atmospheric oxidation by means of pyrite burial. Through high-precision iron isotopic measurements of Archean-Paleoproterozoic sediments and laboratory grown pyrites, we show that the triple iron isotopic composition of Neoarchean-Paleoproterozoic pyrites requires both extensive marine iron oxidation and sulfide-limited pyritization. Using an isotopic fractionation model informed by these data, we constrain the relative sizes of sedimentary Fe3+- oxyhydroxide and pyrite sinks for Neoarchean marine iron. We show that pyrite burial could have resulted in molecular oxygen export exceeding local Fe2+ oxidation sinks, thereby contributing to early episodes of transient oxygenation of Archean surface environments.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00657/76889/78193.pdf

DOI:10.1126/science.aaz8821

https://archimer.ifremer.fr/doc/00657/76889/

Editor: | Amer Assoc Advancement Science
Formato: | application/pdf
Fonte: | Science (0036-8075) (Amer Assoc Advancement Science), 2020-10 , Vol. 370 , N. 6515 , P. 446-449

Fonte:

info:eu-repo/semantics/openAccess

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