| DOI: | 10.1002/2015GL065333
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| 论文题名: | Causes and consequences of mid-Proterozoic anoxia |
| 作者: | Derry L.A.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9106
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| EISSN: | 1944-8837
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| 出版年: | 2015
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| 卷: | 42, 期:20 | | 起始页码: | 8538
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| 结束页码: | 8546
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| 语种: | 英语
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| 英文关键词: | BIF
; oxygen
; phosphorous
; Proterozoic
; vivianite
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| Scopus关键词: | Carbon
; Deposits
; Iron
; Organic carbon
; Oxygen
; Phosphate deposits
; Phosphate minerals
; Sedimentology
; BIF
; Export production
; Low oxygen
; Phosphorite deposits
; phosphorous
; Proterozoic
; Time-scales
; vivianite
; Iron deposits
; anoxic conditions
; deposition
; iron
; organic carbon
; oxygen
; phosphorite
; Proterozoic
; redox conditions
; source-sink dynamics
; vivianite
|
| 英文摘要: | Evidence for low pO2 and a ferruginous ocean characterize the mid-Proterozoic (1.8-0.8 Ga). Considerations of redox sources and sinks imply that generation of O2 via organic carbon (Corg) burial must be low to maintain a low pO2 atmosphere for geologically long intervals, yet low oxygen should result in increased Corg preservation. Marine export production must therefore be low to limit Corg burial and O2 generation. Formation of ferrous phosphate can buffer deepwater phosphate (Pi) to levels an order of magnitude or more below those in the modern ocean, limiting export production. Low deepwater Pi is consistent with the hiatus in sedimentary phosphorite deposits during the mid-Proterozoic, and low pO2 limits formation of sedimentary iron deposits (BIF). We propose that low pO2 was maintained by P limitation resulting from ferrous phosphate buffering. The near-absence of BIF and phosphorite deposition is direct and indirect consequences of the low pO2, respectively. Key Points Ferrous phosphate buffering can limit O2 generation during the mid-Proterozoic Low export production is necessary to maintain low pO2 over long time scales Low pO2 can limit the formation of BIF during the mid-Proterozoic © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946593177&doi=10.1002%2f2015GL065333&partnerID=40&md5=7fca5220e816f4dc67243554b8c4a71e
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8722
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States
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| Recommended Citation: | |
Derry L.A.. Causes and consequences of mid-Proterozoic anoxia[J]. Geophysical Research Letters,2015-01-01,42(20).
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