Triple iron isotope constraints on the role of ocean iron sinks in early atmospheric oxygenation

doi:10.1126/science.aaz8821

GSTDTAP > 气候变化

DOI	10.1126/science.aaz8821
	Triple iron isotope constraints on the role of ocean iron sinks in early atmospheric oxygenation
	Andy W. Heard; Nicolas Dauphas; Romain Guilbaud; Olivier J. Rouxel; Ian B. Butler; Nicole X. Nie; Andrey Bekker
	2020-10-23
发表期刊	Science
出版年	2020
英文摘要	What factors controlled the accumulation of atmospheric oxygen gas (O2) early in the history of Earth? Heard et al. used high-precision iron isotopic measurements of Archean-Paleoproterozoic sediments, with ages between 3.8 billion and 2.3 billion years ago, and laboratory data about synthetic pyrites to show that pyrite, or iron sulfide, burial could have resulted in net O2 export. These reactions therefore may have contributed to early episodes of transient oxygenation before the Great Oxidation Event that began about 2.4 billion years ago. Science , this issue p. [446][1] 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. [1]: /lookup/doi/10.1126/science.aaz8821
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/300294
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Andy W. Heard,Nicolas Dauphas,Romain Guilbaud,et al. Triple iron isotope constraints on the role of ocean iron sinks in early atmospheric oxygenation[J]. Science,2020.
APA	Andy W. Heard.,Nicolas Dauphas.,Romain Guilbaud.,Olivier J. Rouxel.,Ian B. Butler.,...&Andrey Bekker.(2020).Triple iron isotope constraints on the role of ocean iron sinks in early atmospheric oxygenation.Science.
MLA	Andy W. Heard,et al."Triple iron isotope constraints on the role of ocean iron sinks in early atmospheric oxygenation".Science (2020).