DOI: 10.1038/ngeo2122
论文题名: Evidence for oxygenic photosynthesis half a billion years before the Great Oxidation Event
作者: Planavsky N.J. ; Asael D. ; Hofmann A. ; Reinhard C.T. ; Lalonde S.V. ; Knudsen A. ; Wang X. ; Ossa Ossa F. ; Pecoits E. ; Smith A.J.B. ; Beukes N.J. ; Bekker A. ; Johnson T.M. ; Konhauser K.O. ; Lyons T.W. ; Rouxel O.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 4 起始页码: 283
结束页码: 286
语种: 英语
Scopus关键词: air-sea interaction
; atmospheric chemistry
; isotopic analysis
; manganese oxide
; marine atmosphere
; molybdenum
; oxygen
; photosynthesis
; water column
英文摘要: The early Earth was characterized by the absence of oxygen in the ocean-atmosphere system, in contrast to the well-oxygenated conditions that prevail today. Atmospheric concentrations first rose to appreciable levels during the Great Oxidation Event, roughly 2.5-2.3 Gyr ago. The evolution of oxygenic photosynthesis is generally accepted to have been the ultimate cause of this rise, but it has proved difficult to constrain the timing of this evolutionary innovation. The oxidation of manganese in the water column requires substantial free oxygen concentrations, and thus any indication that Mn oxides were present in ancient environments would imply that oxygenic photosynthesis was ongoing. Mn oxides are not commonly preserved in ancient rocks, but there is a large fractionation of molybdenum isotopes associated with the sorption of Mo onto the Mn oxides that would be retained. Here we report Mo isotopes from rocks of the Sinqeni Formation, Pongola Supergroup, South Africa. These rocks formed no less than 2.95 Gyr ago in a nearshore setting. The Mo isotopic signature is consistent with interaction with Mn oxides. We therefore infer that oxygen produced through oxygenic photosynthesis began to accumulate in shallow marine settings at least half a billion years before the accumulation of significant levels of atmospheric oxygen. © 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/106517
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Yale University, New Haven, CT 06520, United States; IFREMER, Plouzané 56470, France; University of Johannesburg, Johannesburg 2092, South Africa; California Institute of Technology, Pasadena, CA 91125, United States; Institut Universitaire Européen de la Mer, Plouzané 29280, France; Lawrence University, Appleton,WI 54911, United States; University of Illinois, Urbana-Champaign, IL 61820, United States; University of Alberta, Edmonton, AB T6G 2R3, Canada; University of California, Riverside, CA 92521, United States
Recommended Citation:
Planavsky N.J.,Asael D.,Hofmann A.,et al. Evidence for oxygenic photosynthesis half a billion years before the Great Oxidation Event[J]. Nature Geoscience,2014-01-01,7(4)