DOI: 10.1038/ngeo2276
论文题名: Evidence for arsenic metabolism and cycling by microorganisms 2.7 billion years ago
作者: Sforna M.C. ; Philippot P. ; Somogyi A. ; Van Zuilen M.A. ; Medjoubi K. ; Schoepp-Cothenet B. ; Nitschke W. ; Visscher P.T.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 11 起始页码: 811
结束页码: 815
语种: 英语
Scopus关键词: abundance
; anoxic conditions
; arsenic
; fossil record
; marine ecosystem
; metabolism
; microbial ecology
; paleoclimate
; Precambrian
; stromatolite
; Australia
; Western Australia
英文摘要: The ability of microbes to metabolize arsenic may have emerged more than 3.4 billion years ago1,2. Some of the modern environments in which prominent arsenic metabolism occurs are anoxic3,4, as were the Precambrian oceans. Early oceans may also have had a relatively high abundance of arsenic5. However, it is unclear whether arsenic cycling occurred in ancient environments. Here we assess the chemistry and nature of cell-like globules identified in salt-encrusted portions of 2.72-billion-year-old fossil stromatolites from Western Australia.We use Raman spectroscopy and X-ray fluorescence to show that the globules are composed of organic carbon and arsenic (As). We argue that our data are best explained by the occurrence of a complete arsenic cycle at this site, with As(III) oxidation and As(V) reduction by microbes living in permanently anoxic conditions. We therefore suggest that arsenic cycling could have occurred more widely in marine environments in the several hundred million years before the Earth's atmosphere and shallow oceans were oxygenated. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106389
Appears in Collections: 气候减缓与适应 科学计划与规划
There are no files associated with this item.
作者单位: Géobiosphère Actuelle and Primitive, Institut de Physique du Globe de Paris, Université Paris Diderot, Paris, France; Synchrotron Soleil, BP 48, Saint-Aubin, Gif-sur-Yvette, France; Laboratoire de Bioenergetique et Ingenierie des Proteines UMR 7281 CNRS/AMU, FR3479, Marseille Cedex 20, France; Department of Marine Sciences, University of Connecticut, Groton, Connecticut, United States
Recommended Citation:
Sforna M.C.,Philippot P.,Somogyi A.,et al. Evidence for arsenic metabolism and cycling by microorganisms 2.7 billion years ago[J]. Nature Geoscience,2014-01-01,7(11)