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DOI | 10.1038/s41561-019-0351-5 |
Proterozoic seawater sulfate scarcity and the evolution of ocean-atmosphere chemistry | |
Fakhraee, Mojtaba1; Hancisse, Olivier2,3; Canfield, Donald E.4,5; Crowe, Sean A.2,3; Katsev, Sergei1,6 | |
2019-05-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2019 |
卷号 | 12期号:5页码:375-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Canada; Denmark |
英文摘要 | Oceanic sulfate concentrations are widely thought to have reached millimolar levels during the Proterozoic Eon, 2.5 to 0.54 billion years ago. Yet the magnitude of the increase in seawater sulfate concentrations over the course of the Eon remains largely unquantified. A rise in seawater sulfate concentrations has been inferred from the increased range of marine sulfide delta S-34 values following the Great Oxidation Event and was induced by two processes: enhanced oxidative weathering of sulfides on land, and the onset of marine sulfur redox cycling. Here we use mass balance and diagenetic reaction-transport models to reconstruct the sulfate concentrations in Proterozoic seawater. We find that sulfate concentrations remained below 400 mu M, and were possibly as low as 100 mu M, throughout much of the Proterozoic. At these low sulfate concentrations, relatively large sulfate-pyrite sulfur isotope differences cannot be explained by sulfate reduction alone and are only possible through oxidative sediment sulfur cycling. This requires oxygen concentrations of at least 10 mu M in shallow Proterozoic seawater, which translates to 1-10% of present atmospheric oxygen concentrations. At these oxygen and sulfate concentrations, the oceans would have been a substantial source of methane to the atmosphere (60-140 Tmol yr(-1)). This methane would have accumulated to high concentrations (more than 25 ppmv) and supported greenhouse warming during much of the Proterozoic Eon, with notable exceptions during the Palaeoproterozoic and Neoproterozoic eras. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467814100014 |
WOS关键词 | METHANE OXIDATION ; ORGANIC-MATTER ; DEEP-OCEAN ; OXYGEN ; SULFUR ; REDUCTION ; RESPIRATION ; CLIMATE ; CARBON ; DISPROPORTIONATION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/183092 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Minnesota, Large Lakes Observ, Duluth, MN 55812 USA; 2.Univ British Columbia, Dept Earth Ocean & Atmospher Sci, Vancouver, BC, Canada; 3.Univ British Columbia, Dept Microbiol & Immunol, Vancouver, BC, Canada; 4.Univ Southern Denmark, Nordic Ctr Earth Evolut, Odense, Denmark; 5.Univ Southern Denmark, Inst Biol, Odense, Denmark; 6.Univ Minnesota, Dept Phys & Astron, Duluth, MN 55812 USA |
推荐引用方式 GB/T 7714 | Fakhraee, Mojtaba,Hancisse, Olivier,Canfield, Donald E.,et al. Proterozoic seawater sulfate scarcity and the evolution of ocean-atmosphere chemistry[J]. NATURE GEOSCIENCE,2019,12(5):375-+. |
APA | Fakhraee, Mojtaba,Hancisse, Olivier,Canfield, Donald E.,Crowe, Sean A.,&Katsev, Sergei.(2019).Proterozoic seawater sulfate scarcity and the evolution of ocean-atmosphere chemistry.NATURE GEOSCIENCE,12(5),375-+. |
MLA | Fakhraee, Mojtaba,et al."Proterozoic seawater sulfate scarcity and the evolution of ocean-atmosphere chemistry".NATURE GEOSCIENCE 12.5(2019):375-+. |
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