IGGCAS OpenIR  > 新生代地质与环境院重点实验室
Hexagonal magnetite in Algoma-type banded iron formations of the ca. 2.52 Ga Baizhiyan Formation, North China: Evidence for a green rust precursor?
Sun, Longfei1,2; Lechte, Maxwell3; Shi, Xiaoying1,2; Zhou, Xiqiang4,5; Zhou, Limin6; Fang, Hao2; Xie, Baozeng2; Wu, Mengting7; Tang, Dongjie1,7
2022-05-25
Source PublicationAMERICAN MINERALOGIST
ISSN0003-004X
Volume107Issue:5Pages:970-984
AbstractBanded iron formations (BIFs) are iron-rich marine chemical sedimentary rocks, and their mineralogy and geochemistry can be used to gain insights into ancient ocean chemistry and biospheric evolution. Magnetite is the major iron-bearing mineral in many BIFs (particularly in the Archean) and is variably interpreted to be of primary, early diagenetic, or metamorphic origin. Different genetic interpretations for magnetite lead to divergent pictures of the Precambrian Earth system and its evolutionary models through time. The Baizhiyan Formation of the Neoarchean Wutai Group (Shanxi, North China) features magnetite-bearing, Algoma-type BIFs deposited ca. 2.52 Ga, in the lead-up to a major period of global iron formation deposition in the Paleoproterozoic. Abundant magnetite crystals found in the silica-rich bands of these BIFs show euhedral, hexagonal morphology. We suggest that this hexagonal magnetite likely represents pseudomorphs after green rust, a mixed-valence iron hydroxy-salt formed in the water column. The rare earth element composition of the BIFs shows negligible to slightly positive Ce anomalies (Ce-SN/Ce-SN* = 1.03 +/- 0.07), which is characteristic of a dominantly anoxic water column. The presence of positive Eu anomalies (Eu-SN/Eu-SN* <3.9) suggests a substantial influence from proximal hydrothermal fluids. The co-occurrence of siderite layers associated with the magnetite-bearing strata may indicate iron cycling associated with ferruginous bottom seawater conditions. Geochemical signatures of the Baizhiyan BIFs are consistent with the interpretation that the magnetite was transformed from metastable green rust. This green rust could have formed via several processes, including the partial oxidation of Fe(II) by molecular oxygen/photoferrotrophs, the reaction of settling ferrihydrite with Fe(II)-rich hydrothermal fluids under anoxic conditions, or local dissimilatory iron reduction. In all cases, the contribution of primary green rust to BIF formation requires iron redox cycling, and similar pseudomorphs in the form of hexagonal magnetite may be more common in the geological record. Our findings support the models in which green rust was an important primary constituent of the Precambrian iron cycle, and the potential interactions of green rust with other elements (e.g., phosphorus) should be taken into consideration when reconstructing Precambrian biogeochemical cycles.
KeywordFerrihydrite iron redox cycling ferruginous Ce anomalies Eu anomalies hydrothermal fluid activity
DOI10.2138/am-2022-7981
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Chinese "111" project ; Chinese "111" project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fonds de Recherche du Quebec-Nature et Technologies ; Fonds de Recherche du Quebec-Nature et Technologies ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Chinese "111" project ; Chinese "111" project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fonds de Recherche du Quebec-Nature et Technologies ; Fonds de Recherche du Quebec-Nature et Technologies ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Chinese "111" project ; Chinese "111" project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fonds de Recherche du Quebec-Nature et Technologies ; Fonds de Recherche du Quebec-Nature et Technologies ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Chinese "111" project ; Chinese "111" project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fonds de Recherche du Quebec-Nature et Technologies ; Fonds de Recherche du Quebec-Nature et Technologies
WOS KeywordRARE-EARTH-ELEMENTS ; MARINE REDOX CONDITIONS ; ISOTOPE FRACTIONATION ; TRANSVAAL SUPERGROUP ; NONREDOX TRANSFORMATIONS ; FERRIC OXYHYDROXIDES ; FORMATION DEPOSITION ; DIAGENETIC SIDERITE ; PROTEROZOIC OCEAN ; ARCHEAN SEAWATER
Language英语
Funding ProjectNational Natural Science Foundation of China[41930320] ; National Natural Science Foundation of China[41972028] ; Key Research Program of the Institute of Geology & Geophysics, CAS[IGGCAS-201905] ; Chinese "111" project[B20011] ; Fundamental Research Funds for the Central Universities[2652019093] ; Fundamental Research Funds for the Central Universities[2652019250] ; Fonds de Recherche du Quebec-Nature et Technologies
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Chinese "111" project ; Chinese "111" project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fonds de Recherche du Quebec-Nature et Technologies ; Fonds de Recherche du Quebec-Nature et Technologies ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Chinese "111" project ; Chinese "111" project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fonds de Recherche du Quebec-Nature et Technologies ; Fonds de Recherche du Quebec-Nature et Technologies ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Chinese "111" project ; Chinese "111" project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fonds de Recherche du Quebec-Nature et Technologies ; Fonds de Recherche du Quebec-Nature et Technologies ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Chinese "111" project ; Chinese "111" project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fonds de Recherche du Quebec-Nature et Technologies ; Fonds de Recherche du Quebec-Nature et Technologies
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000790666400018
PublisherMINERALOGICAL SOC AMER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105173
Collection新生代地质与环境院重点实验室
Corresponding AuthorTang, Dongjie
Affiliation1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China
2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
3.McGill Univ, Dept Earth & Planetary Sci, 3450 Univ St, Montreal, PQ H3A 0E8, Canada
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.Natl Res Ctr Geoanal, Beijing 100037, Peoples R China
7.China Univ Geosci, Inst Earth Sci, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Sun, Longfei,Lechte, Maxwell,Shi, Xiaoying,et al. Hexagonal magnetite in Algoma-type banded iron formations of the ca. 2.52 Ga Baizhiyan Formation, North China: Evidence for a green rust precursor?[J]. AMERICAN MINERALOGIST,2022,107(5):970-984.
APA Sun, Longfei.,Lechte, Maxwell.,Shi, Xiaoying.,Zhou, Xiqiang.,Zhou, Limin.,...&Tang, Dongjie.(2022).Hexagonal magnetite in Algoma-type banded iron formations of the ca. 2.52 Ga Baizhiyan Formation, North China: Evidence for a green rust precursor?.AMERICAN MINERALOGIST,107(5),970-984.
MLA Sun, Longfei,et al."Hexagonal magnetite in Algoma-type banded iron formations of the ca. 2.52 Ga Baizhiyan Formation, North China: Evidence for a green rust precursor?".AMERICAN MINERALOGIST 107.5(2022):970-984.
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