The formation of magnetite in the early Archean oceans

doi:10.1016/j.epsl.2017.03.013

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	The formation of magnetite in the early Archean oceans
	Li, Yi-Liang 1; Konhauser, Kurt O.2; Zhai, Mingguo 3
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2017-05-15
卷号	466 页码:103-114
关键词	Archean banded iron formation photosynthetic Fe(II)-oxidation magnetite green rust deep-sea hydrothermal fluid
ISSN号	0012-821X
DOI	10.1016/j.epsl.2017.03.013
文献子类	Article
英文摘要	Banded iron formations (BIFs) are iron- and silica-rich chemical sedimentary rocks that were deposited throughout much of the Precambrian. The biological oxidation of dissolved Fe(II) led to the precipitation of a ferric oxyhydroxide phase, such as ferrihydrite, in the marine photic zone. Upon burial, ferrihydrite was either transformed into hematite through dehydration or it was reduced to magnetite via biological or abiological Fe(III) reduction coupled to the oxidation of buried microbial biomass. However, it has always been intriguing as to why the oldest BIFs are characteristically magnetite-rich, while BIFs formed after the Neoarchean are dominated by hematite. Here, we propose that some magnetite in early Archean BIF could have precipitated directly from seawater through the reaction of settling ferrihydrite and hot, Fe(II)-rich hydrothermal fluids that existed in the deeper waters. We conducted experiments that showed the reaction of Fe(II) with biogenic ferric iron mats under strict anoxic conditions lead to the formation of a metastable green rust phase that within hours transformed into magnetite. Our model further posits that with the progressive cooling and oxidation of the Earth's oceans, the above reaction shuts off, and magnetite was subsequently restricted to reactions associated with diagenesis and metamorphism. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词	BANDED-IRON-FORMATIONS ; GREEN RUST ; WESTERN-AUSTRALIA ; FE(III) MINERALS ; DEPOSITION ; TRANSFORMATION ; HEMATITE ; GEOCHEMISTRY ; METAMORPHISM ; TEMPERATURE
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000400225800011
资助机构	General Research Fund from Research Grants Council of Hong Kong(HKU702913P) ; Discovery Grant from the Natural Sciences and Engineering Research Council of Canada(DG165831) ; Chinese Academy of Sciences(XDB18030205 ; QYZDY-SSW-DQco17) ; General Research Fund from Research Grants Council of Hong Kong(HKU702913P) ; Discovery Grant from the Natural Sciences and Engineering Research Council of Canada(DG165831) ; Chinese Academy of Sciences(XDB18030205 ; QYZDY-SSW-DQco17) ; General Research Fund from Research Grants Council of Hong Kong(HKU702913P) ; Discovery Grant from the Natural Sciences and Engineering Research Council of Canada(DG165831) ; Chinese Academy of Sciences(XDB18030205 ; QYZDY-SSW-DQco17) ; General Research Fund from Research Grants Council of Hong Kong(HKU702913P) ; Discovery Grant from the Natural Sciences and Engineering Research Council of Canada(DG165831) ; Chinese Academy of Sciences(XDB18030205 ; QYZDY-SSW-DQco17)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/42207]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Li, Yi-Liang
作者单位	1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 2.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB, Canada 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Li, Yi-Liang,Konhauser, Kurt O.,Zhai, Mingguo. The formation of magnetite in the early Archean oceans[J]. EARTH AND PLANETARY SCIENCE LETTERS,2017,466:103-114.
APA	Li, Yi-Liang,Konhauser, Kurt O.,&Zhai, Mingguo.(2017).The formation of magnetite in the early Archean oceans.EARTH AND PLANETARY SCIENCE LETTERS,466,103-114.
MLA	Li, Yi-Liang,et al."The formation of magnetite in the early Archean oceans".EARTH AND PLANETARY SCIENCE LETTERS 466(2017):103-114.