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Formation of biogenic sheath-like Fe oxyhydroxides in a near-neutral pH hot spring: Implications for the origin of microfossils in high-temperature, Fe-rich environments
Peng, Xiaotong1,2; Chen, Shun2; Xu, Hengchao1
2013-12-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
Volume118Issue:4Pages:1397-1413
AbstractA small hot spring that is informally called Fe-waterfall spring and is located in the Rehai geothermal area discharges hot (42 to 73 degrees C), near-neutral (pH = 7.65) Fe-rich water. Submerged reddish precipitates are composed largely of ferrihydrite, goethite, lepidocrocite, opal-A, quartz, and anorthite, as revealed by X-ray diffraction (XRD) and Mossbauer spectroscopy. Molecular phylogenetic analysis demonstrates that the bacterial community in these precipitates is mainly composed of Cyanobacteria, Planctomycetes, -proteobacteria, Deinococci-Thermus, and Chlorobi. Scanning electron microscopy and high-resolution transmission electron microscopy examinations show that abundant sheath-like Fe oxyhydroxides, which exhibit different morphologies and sizes, are present in Fe-rich precipitates. These sheath-like structures are composed of ferrihydrite rather than more crystalline lepidocrocite or goethite. Energy-dispersive X-ray spectrometer, scanning transmission electron microscopy, and nano secondary ion mass spectrometry reveal that they are mainly composed of Fe, Si, and O, together with some trace elements. Most of the sheath-like structures are not morphologically comparable to biogenic Fe oxyhydroxides produced by known chemolithotrophic Fe oxidizers, which is consistent with the fact that no chemolithotrophic Fe oxidizers were identified by molecular analysis in the precipitates. We suggest that the sheath-like Fe oxyhydroxides are formed through passive Fe sorption and nucleation onto the cell walls of various thermophiles rather than by the direct metabolic activities of chemolithotrophic Fe oxidizers. Biogenic sheath-like Fe oxyhydroxides in Fe-waterfall spring have important implications for geochemical cycles driven by microorganisms, the origin of microfossils, and the formation of banded iron formations (BIFs) in the Archean ocean.
SubtypeArticle
KeywordBiogenic Fe Oxyhydroxide Biomineralization Cyanobacteria Microbial Diversity Banded Iron Formations (Bifs) Hot Spring
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI10.1002/jgrg.20119
Indexed BySCI
Language英语
WOS KeywordIRON-OXIDIZING BACTERIA ; ACID-MINE DRAINAGE ; DE-FUCA RIDGE ; NORTHEAST PACIFIC-OCEAN ; BACILLUS-SUBTILIS ; 6-LINE FERRIHYDRITE ; ELECTRON-MICROSCOPY ; MICROBIAL BIOFILMS ; HYDROTHERMAL VENTS ; METAL INTERACTIONS
WOS SubjectEnvironmental Sciences ; Geosciences, Multidisciplinary
WOS IDWOS:000329871400005
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/746
Collection深海科学研究部_深海地质与地球化学研究室
Affiliation1.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Sanya 572000, Hainan, Peoples R China
2.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
First Author AffilicationInstitute of Deep-sea Science and Engineering,CAS
Recommended Citation
GB/T 7714
Peng, Xiaotong,Chen, Shun,Xu, Hengchao. Formation of biogenic sheath-like Fe oxyhydroxides in a near-neutral pH hot spring: Implications for the origin of microfossils in high-temperature, Fe-rich environments[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2013,118(4):1397-1413.
APA Peng, Xiaotong,Chen, Shun,&Xu, Hengchao.(2013).Formation of biogenic sheath-like Fe oxyhydroxides in a near-neutral pH hot spring: Implications for the origin of microfossils in high-temperature, Fe-rich environments.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,118(4),1397-1413.
MLA Peng, Xiaotong,et al."Formation of biogenic sheath-like Fe oxyhydroxides in a near-neutral pH hot spring: Implications for the origin of microfossils in high-temperature, Fe-rich environments".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 118.4(2013):1397-1413.
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