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Iron isotope fractionation in anoxygenic phototrophic Fe(II) oxidation by Rhodobacter ferrooxidans SW2

文献类型：期刊论文

作者Han, Xiaohua2,3,4; He, Yongsheng1; Li, Jinhua3,4; Kappler, Andreas2; Pan, Yongxin3,4
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2022-09-01
卷号332页码:355-368
关键词Iron biogeochemical cycling Anoxygenic photosynthetic Fe(II) oxidation Iron isotope fractionation Redox state of paleo oceans
ISSN号0016-7037
DOI10.1016/j.gca.2022.06.034
英文摘要Microbially mediated Fe(II) oxidation is one of the most important pathways of Fe redox cycling on both present and early Earth. It was proposed to participate in iron formations (IFs) deposition under oxygen-depleted oceanic conditions before the Great Oxidation Event (GOE). Fe isotopic records in IFs provide important archives for the redox state of iron pool in paleo oceans. There have been a number of iron-oxidizing experiments which used bacteria with different metabolic pathways. However, it still needs further research on how and to what extent Fe isotopes are fractionated during Fe(II) oxidation mediated by the anoxygenic phototrophic Fe(II)-oxidizer, as well as its implications for the redox state of iron pool in paleo oceans. Here, we report Fe isotope fractionation between Fe(II)(aq) and Fe(III) (oxyhydr)oxides precipitates produced by the anoxygenic phototrophic Fe(II)-oxidizer Rhodobacter ferrooxidans SW2 at ambient temperature (20 degrees C). Mossbauer spectroscopy analyses indicated that the final mineral product was ferrihydrite. The corrected Fe isotope fractionation between Fe(II)(aq) and precipitates (Delta Fe-56(precipitate)-(Fe)(II)aq) ranged from ca. -0.37 +/- 0.04 parts per thousand (2se, N = 2) after 1 day of cultivation to 2. 96 +/- 0.17 parts per thousand (2se, N = 2) after 22 days of cultivation. The observed fractionation cannot be explained by neither a simple Rayleigh nor equilibrium process, but likely recorded a process from an isotopic disequilibrium reaching complete or near-complete equilibrium during 22 days of cultivation. The lower precipitation rate after 7 days, small size of oxidation products and dissolution-oxidation-reprecipitation processes probably promoted isotope exchange overwhelming the kinetic effect, resulting in a final isotope equilibrium between precipitates and Fe(II)(aq). It revealed that the ferrihydrite produced by Fe(II) oxidation by anoxygenic photoferrotrophy could reach Fe isotope equilibrium relatively easily, thus IFs may record Fe isotope equilibrium with the fluids from which they precipitated, i.e. in some cases solely from seawater in Archean oceans. (C) 2022 Elsevier Ltd. All rights reserved.
WOS关键词GEOLOGICAL REFERENCE MATERIALS ; AQUEOUS FERROUS IRON ; MARINE PHOTOFERROTROPH ; RHODOVULUM-IODOSUM ; ARCHEAN OCEAN ; FE ; HEMATITE ; BACTERIA ; EQUILIBRIUM ; EXCHANGE
资助项目National Natural Science Foundation of China[41621004] ; National Natural Science Foundation of China[41890843] ; National Natural Science Foundation of China[41502320] ; China Postdoctoral Science Foundation[2021M693151] ; Fundamental Research Funds for the Central Universities[3-7-5-2019-07] ; 111 Project of the Ministry of Science and Technology, China[BP0719021] ; State Key Laboratory of Geological Processes and Mineral Resources
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000861037700006
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; 111 Project of the Ministry of Science and Technology, China ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources ; State Key Laboratory of Geological Processes and Mineral Resources
源URL[http://ir.iggcas.ac.cn/handle/132A11/108325]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Han, Xiaohua; He, Yongsheng
作者单位1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.Univ Tubingen, Ctr Appl Geosci, Geomicrobiol, Schnarrenbergstr 94-96, D-72076 Tubingen, Germany
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Biogeomagnetism Grp, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Han, Xiaohua,He, Yongsheng,Li, Jinhua,et al. Iron isotope fractionation in anoxygenic phototrophic Fe(II) oxidation by Rhodobacter ferrooxidans SW2[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2022,332:355-368.
APA Han, Xiaohua,He, Yongsheng,Li, Jinhua,Kappler, Andreas,&Pan, Yongxin.(2022).Iron isotope fractionation in anoxygenic phototrophic Fe(II) oxidation by Rhodobacter ferrooxidans SW2.GEOCHIMICA ET COSMOCHIMICA ACTA,332,355-368.
MLA Han, Xiaohua,et al."Iron isotope fractionation in anoxygenic phototrophic Fe(II) oxidation by Rhodobacter ferrooxidans SW2".GEOCHIMICA ET COSMOCHIMICA ACTA 332(2022):355-368.

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来源：地质与地球物理研究所

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