DOI: 10.1016/j.epsl.2018.06.026
Scopus记录号: 2-s2.0-85048962123
论文题名: Cryogenic silicification of microorganisms in hydrothermal fluids
作者: Fox-Powell M.G. ; Channing A. ; Applin D. ; Cloutis E. ; Preston L.J. ; Cousins C.R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 498 起始页码: 1
结束页码: 8
语种: 英语
英文关键词: biosignatures
; cryogenic opal-A
; hydrothermal
; microfossils
; silicification
Scopus关键词: Cryogenics
; Fourier transform infrared spectroscopy
; Freezing
; Hot springs
; Silica
; Biosignatures
; Freezing temperatures
; hydrothermal
; Hydrothermal activity
; Hydrothermal environment
; Microfossils
; Shortwave Infrared Reflectance
; silicification
; Bacteria
; Bacteria (microorganisms)
; Chloroflexus
英文摘要: Silica-rich hydrothermal fluids that experience freezing temperatures precipitate cryogenic opal-A (COA) within ice-bound brine channels. We investigated cryogenic silicification as a novel preservation pathway for chemo- and photo-lithotrophic Bacteria and Archaea. We find that the co-partitioning of microbial cells and silica into brine channels causes microorganisms to become fossilised in COA. Rod- and coccoidal-form Bacteria and Archaea produce numerous cell casts on COA particle surfaces, while Chloroflexus filaments are preserved inside particle interiors. COA particles precipitated from natural Icelandic hot spring fluids possess similar biomorphic casts, including those containing intact microbial cells. Biomolecules and inorganic metabolic products are also captured by COA precipitation, and are detectable with a combination of visible – shortwave infrared reflectance, FTIR, and Raman spectroscopy. We identify cryogenic silicification as a newly described mechanism by which microbial biosignatures can be preserved within silica-rich hydrothermal environments. This work has implications for the interpretation of biosignatures in relic hydrothermal settings, and for life-detection on Mars and Enceladus, where opaline silica indicative of hydrothermal activity has been detected, and freezing surface conditions predominate. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109766
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: School of Earth and Environmental Sciences, University of St Andrews, Irvine Building, North Street, Fife, St Andrews, KY16 9AL, United Kingdom; St Andrews Centre for Exoplanet Science, University of St Andrews, United Kingdom; School of Earth and Ocean Sciences, Cardiff University, Cardiff, Wales CF10 3AT, United Kingdom; Department of Geography, University of Winnipeg, Winnipeg, MB R3B 2E9, Canada; Department of Earth and Planetary Science, Birkbeck, University of London, Malet St., Bloomsbury, London, United Kingdom
Recommended Citation:
Fox-Powell M.G.,Channing A.,Applin D.,et al. Cryogenic silicification of microorganisms in hydrothermal fluids[J]. Earth and Planetary Science Letters,2018-01-01,498