中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 中国科学院新生代地质与环境重点实验室
Hexagonal magnetite in Algoma-type banded iron formations of the ca. 2.52 Ga Baizhiyan Formation, North China: Evidence for a green rust precursor?

文献类型：期刊论文

作者Sun, Longfei1,2; Lechte, Maxwell3; Shi, Xiaoying1,2; Zhou, Xiqiang4,5; Zhou, Limin6; Fang, Hao2; Xie, Baozeng2; Wu, Mengting7; Tang, Dongjie1,7
刊名AMERICAN MINERALOGIST
出版日期2022-05-25
卷号107期号:5页码:970-984
ISSN号0003-004X
关键词Ferrihydrite iron redox cycling ferruginous Ce anomalies Eu anomalies hydrothermal fluid activity
DOI10.2138/am-2022-7981
英文摘要Banded 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.
WOS关键词RARE-EARTH-ELEMENTS ; MARINE REDOX CONDITIONS ; ISOTOPE FRACTIONATION ; TRANSVAAL SUPERGROUP ; NONREDOX TRANSFORMATIONS ; FERRIC OXYHYDROXIDES ; FORMATION DEPOSITION ; DIAGENETIC SIDERITE ; PROTEROZOIC OCEAN ; ARCHEAN SEAWATER
资助项目National 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
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者MINERALOGICAL SOC AMER
WOS记录号WOS:000790666400018
资助机构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 ; 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
源URL[http://ir.iggcas.ac.cn/handle/132A11/105173]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Tang, Dongjie
作者单位1.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
推荐引用方式
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.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。