干旱区生态环境知识资源中心(Arid): Oxygen production and rapid iron oxidation in stromatolites immediately predating the Great Oxidation Event

Arid

DOI	10.1016/j.epsl.2022.117416
	Oxygen production and rapid iron oxidation in stromatolites immediately predating the Great Oxidation Event
	Heard, Andy W.; Bekker, Andrey; Kovalick, Alex; Tsikos, Harilaos; Ireland, Thomas; Dauphas, Nicolas
通讯作者	Heard, AW
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
ISSN	0012-821X
EISSN	1385-013X
出版年	2022
卷号	582
英文摘要	Earth's surface became permanently oxygenated during the Great Oxidation Episode, a geochemical transition between -2.43 and 2.22 billion years ago, but shallow-water cyanobacterial oases with molecular oxygen production likely existed for hundreds of millions of years before, in the otherwise anoxic and iron-rich oceans. Despite abundant geochemical evidence for elevated ambient oxygen in the Archean upper ocean, sites of active microbial oxygen production have not been geochemically characterized. We report geochemical and iron isotopic data for a horizon of iron-rich stromatolites in the 2.46-2.43 Ga Griquatown Iron Formation in South Africa deposited on the margin of an anoxic ferruginous basin. Bulk-rock and micro-sampled iron isotope data for the stromatolites indicate quantitative oxidation of iron delivered by deep upwelling currents, which is most readily explained by cyanobacterial communities inhabiting the stromatolites and producing local oxygen enrichments near the fair-weather wave-base. Modest enrichments in Mn and Ce indicate high oxidation potential in this stromatolitic setting. The iron-rich nature of the stromatolites indicates that upwelling iron sources in the early Paleoproterozoic oceans overwhelmed established iron-precipitation mechanisms in deeper basins that had generally maintained iron-poor conditions in shallow-marine peritidal zone during the Neoarchean. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
英文关键词	stromatolites iron oxidation iron isotopes oxygen cyanobacteria iron formations
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000782125400004
WOS关键词	RARE-EARTH-ELEMENTS ; PROTEROZOIC TRANSVAAL SUPERGROUP ; ISOTOPE FRACTIONATION ; FACIES TRANSITION ; SOUTH-AFRICA ; DEPOSITION ; SEDIMENTOLOGY ; MANGANESE ; SEAWATER ; PHOTOSYNTHESIS
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392260
推荐引用方式 GB/T 7714	Heard, Andy W.,Bekker, Andrey,Kovalick, Alex,et al. Oxygen production and rapid iron oxidation in stromatolites immediately predating the Great Oxidation Event[J],2022,582.
APA	Heard, Andy W.,Bekker, Andrey,Kovalick, Alex,Tsikos, Harilaos,Ireland, Thomas,&Dauphas, Nicolas.(2022).Oxygen production and rapid iron oxidation in stromatolites immediately predating the Great Oxidation Event.EARTH AND PLANETARY SCIENCE LETTERS,582.
MLA	Heard, Andy W.,et al."Oxygen production and rapid iron oxidation in stromatolites immediately predating the Great Oxidation Event".EARTH AND PLANETARY SCIENCE LETTERS 582(2022).