气候变化领域集成服务门户(CCPortal): Petrographic carbon in ancient sediments constrains Proterozoic Era atmospheric oxygen levels

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DOI	10.1073/pnas.2101544118
	Petrographic carbon in ancient sediments constrains Proterozoic Era atmospheric oxygen levels
	Canfield D.E.; van Zuilen M.A.; Nabhan S.; Bjerrum C.J.; Zhang S.; Wang H.; Wang X.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:23
英文摘要	Oxygen concentration defines the chemical structure of Earth's ecosystems while it also fuels the metabolism of aerobic organisms. As different aerobes have different oxygen requirements, the evolution of oxygen levels through time has likely impacted both environmental chemistry and the history of life. Understanding the relationship between atmospheric oxygen levels, the chemical environment, and life, however, is hampered by uncertainties in the history of oxygen levels. We report over 5,700 Raman analyses of organic matter from nine geological formations spanning in time from 742 to 1,729 Ma. We find that organic matter was effectively oxidized during weathering and little was recycled into marine sediments. Indeed, during this time interval, organic matter was as efficiently oxidized during weathering as it is now. From these observations, we constrain minimum atmospheric oxygen levels to between 2 to 24% of present levels from the late Paleoproterozoic Era into the Neoproterozoic Era. Indeed, our results reveal that eukaryote evolution, including early animal evolution, was not likely hindered by oxygen through this time interval. Our results also show that due to efficient organic recycling during weathering, carbon cycle dynamics can be assessed directly from the sediment carbon record. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Evolution; Graphite; Oxygen Proterozoic; Weathering
语种	英语
scopus关键词	carbon; organic matter; oxygen; aromatization; Article; atmosphere; concentration (parameter); Neoproterozoic; Paleoproterozoic; Proterozoic; Raman spectrometry; sediment; weathering
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238528
作者单位	Nordcee and Institute of Biology, University of Southern Denmark, Odense, 5230, Denmark; Danish Institute of Advanced Study, Odense, 5230, Denmark; Key Laboratory of Petroleum Geochemistry, Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing, 100083, China; Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, 75005, France; Department of Geosciences and Natural Resource Management, University of Copenhagen, København, 1350, Denmark
推荐引用方式 GB/T 7714	Canfield D.E.,van Zuilen M.A.,Nabhan S.,et al. Petrographic carbon in ancient sediments constrains Proterozoic Era atmospheric oxygen levels[J],2021,118(23).
APA	Canfield D.E..,van Zuilen M.A..,Nabhan S..,Bjerrum C.J..,Zhang S..,...&Wang X..(2021).Petrographic carbon in ancient sediments constrains Proterozoic Era atmospheric oxygen levels.Proceedings of the National Academy of Sciences of the United States of America,118(23).
MLA	Canfield D.E.,et al."Petrographic carbon in ancient sediments constrains Proterozoic Era atmospheric oxygen levels".Proceedings of the National Academy of Sciences of the United States of America 118.23(2021).