DOI: 10.1038/ngeo2707
论文题名: Two-step rise of atmospheric oxygen linked to the growth of continents
作者: Lee C.-T.A. ; Yeung L.Y. ; McKenzie N.R. ; Yokoyama Y. ; Ozaki K. ; Lenardic A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 6 起始页码: 417
结束页码: 424
语种: 英语
Scopus关键词: atmosphere-ocean system
; crust
; feldspar
; felsic rock
; iron
; mafic rock
; magnesium
; organic carbon
; oxygen
; oxygenation
; paleoclimate
; plate tectonics
英文摘要: Earth owes its oxygenated atmosphere to its unique claim on life, but how the atmosphere evolved from an initially oxygen-free state remains unresolved. The rise of atmospheric oxygen occurred in two stages: approximately 2.5 to 2.0 billion years ago during the Great Oxidation Event and roughly 2 billion years later during the Neoproterozoic Oxygenation Event. We propose that the formation of continents about 2.7 to 2.5 billion years ago, perhaps due to the initiation of plate tectonics, may have led to oxygenation by the following mechanisms. In the first stage, the change in composition of Earth's crust from iron- and magnesium-rich mafic rocks to feldspar- and quartz-rich felsic rocks could have caused a decrease in the oxidative efficiency of the Earth's surface, allowing atmospheric O2 to rise. Over the next billion years, as carbon steadily accumulated on the continents, metamorphic and magmatic reactions within this growing continental carbon reservoir facilitated a gradual increase in the total long-term input of CO2 to the ocean-atmosphere system. Given that O2 is produced during organic carbon burial, the increased CO2 input may have triggered a second rise in O2. A two-step rise in atmospheric O2 may therefore be a natural consequence of plate tectonics, continent formation and the growth of a crustal carbon reservoir. © 2016 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106005
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: Department of Earth Science, Rice University, Houston, TX, United States; Department of Geology and Geophysics, Yale University, New Haven, CT, United States; Department of Earth Sciences, University of Hong Kong, Pokfulam, Hong Kong; Atmosphere and Ocean Research Institute, University of Tokyo, Tokyo, Japan
Recommended Citation:
Lee C.-T.A.,Yeung L.Y.,McKenzie N.R.,et al. Two-step rise of atmospheric oxygen linked to the growth of continents[J]. Nature Geoscience,2016-01-01,9(6)