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DOI10.1073/pnas.2105074118
Triple oxygen isotope constraints on atmospheric O2and biological productivity during the mid-Proterozoic
Liu P.; Liu J.; Ji A.; Reinhard C.T.; Planavsky N.J.; Babikov D.; Najjar R.G.; Kasting J.F.
发表日期2021
ISSN0027-8424
卷号118期号:51
英文摘要Reconstructing the history of biological productivity and atmospheric oxygen partial pressure (pO2) is a fundamental goal of geobiology. Recently, the mass-independent fractionation of oxygen isotopes (O-MIF) has been used as a tool for estimating pO2and productivity during the Proterozoic. O-MIF, reported as δ'17O, is produced during the formation of ozone and destroyed by isotopic exchange with water by biological and chemical processes. Atmospheric O-MIF can be preserved in the geologic record when pyrite (FeS2) is oxidized during weathering, and the sulfur is redeposited as sulfate. Here, sedimentary sulfates from the ~1.4-Ga Sibley Formation are reanalyzed using a detailed one-dimensional photochemical model that includes physical constraints on air-sea gas exchange. Previous analyses of these data concluded that pO2at that time was <1% PAL (times the present atmospheric level). Our model shows that the upper limit on pO2is essentially unconstrained by these data. Indeed, pO2levels below 0.8% PAL are possible only if atmospheric methane was more abundant than today (so that pCO2could have been lower) or if the Sibley O-MIF data were diluted by reprocessing before the sulfates were deposited. Our model also shows that, contrary to previous assertions, marine productivity cannot be reliably constrained by the O-MIF data because the exchange of molecular oxygen (O2) between the atmosphere and surface ocean is controlled more by air-sea gas transfer rates than by biological productivity. Improved estimates of pCO2and/or improved proxies for Δ'17O of atmospheric O2would allow tighter constraints to be placed on mid-Proterozoic pO2. © 2021 National Academy of Sciences. All rights reserved.
英文关键词Atmospheric O2; Biological productivity j gross primary productivity; Mass-independent isotope fractionation; Mid-Proterozoic
语种英语
scopus关键词oxygen; ozone; atmosphere; chemistry; ecosystem; environmental aspects and related phenomena; sediment; Atmosphere; Earth, Planet; Ecological and Environmental Phenomena; Ecosystem; Geologic Sediments; Oxygen Isotopes; Ozone
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/250918
作者单位Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education and College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China; Department of Geosciences, The Pennsylvania State University, University Park, PA 16802, United States; Department of Atmospheric and Oceanic Sciences, Peking University, Beijing, 100871, China; Department of Earth and Planetary Sciences, Yale University, New Haven, CT 06511, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States; Alternative Earths Team, NASA Interdisciplinary Consortia for Astrobiology Research, Riverside, CA 92521, United States; Department of Chemistry, Marquette University, Milwaukee, WI 53201, United States; Department of Meteorology and Atmospheric Science, The Pennsylvania State University, University Park, PA 16802, United States
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Liu P.,Liu J.,Ji A.,et al. Triple oxygen isotope constraints on atmospheric O2and biological productivity during the mid-Proterozoic[J],2021,118(51).
APA Liu P..,Liu J..,Ji A..,Reinhard C.T..,Planavsky N.J..,...&Kasting J.F..(2021).Triple oxygen isotope constraints on atmospheric O2and biological productivity during the mid-Proterozoic.Proceedings of the National Academy of Sciences of the United States of America,118(51).
MLA Liu P.,et al."Triple oxygen isotope constraints on atmospheric O2and biological productivity during the mid-Proterozoic".Proceedings of the National Academy of Sciences of the United States of America 118.51(2021).
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