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

doi:10.1002/jgrg.20119

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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
	Xu, Hengchao1 ; Chen, Shun2 ; Peng, Xiaotong1,2
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
	2013-12-01
卷号	118 期号:4 页码:1397-1413
关键词	Biogenic Fe Oxyhydroxide Biomineralization Cyanobacteria Microbial Diversity Banded Iron Formations (Bifs) Hot Spring
DOI	10.1002/jgrg.20119
文献子类	Article
英文摘要	A 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.
WOS关键词	IRON-OXIDIZING BACTERIA ; ACID-MINE DRAINAGE ; DE-FUCA RIDGE ; NORTHEAST PACIFIC-OCEAN ; BACILLUS-SUBTILIS ; 6-LINE FERRIHYDRITE ; ELECTRON-MICROSCOPY ; MICROBIAL BIOFILMS ; HYDROTHERMAL VENTS ; METAL INTERACTIONS
语种	英语
WOS记录号	WOS:000329871400005
内容类型	期刊论文
版本	出版稿
源URL	[http://124.16.218.2:8080/handle/183446/746]
专题	专家咨询委员会深海科学研究部_深海地质与地球化学研究室
作者单位	1.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
推荐引用方式 GB/T 7714	Xu, Hengchao,Chen, Shun,Peng, Xiaotong. 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	Xu, Hengchao,Chen, Shun,&Peng, Xiaotong.(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	Xu, Hengchao,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.