期刊
SCIENCE
卷 370, 期 6515, 页码 446-449出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaz8821
关键词
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资金
- NASA [80NSSC17K0744, 359NNX17AE86G, NNX17AE87G, 80NSSC20K0821]
- NSF [EAR-2001098]
- Eckhardt Scholarship from the University of Chicago
- NSERC
- NASA [1001472, NNX17AE87G] Funding Source: Federal RePORTER
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.
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