气候变化领域集成服务门户(CCPortal): Ammonium availability in the Late Archaean nitrogen cycle

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DOI	10.1038/s41561-019-0371-1
	Ammonium availability in the Late Archaean nitrogen cycle
	Yang J.; Junium C.K.; Grassineau N.V.; Nisbet E.G.; Izon G.; Mettam C.; Martin A.; Zerkle A.L.
发表日期	2019
ISSN	17520894
卷号	12 期号:7
英文摘要	The bioavailability of essential nutrients such as nitrogen and phosphorus has fluctuated with the chemical evolution of Earth surface environments over geological timescales. However, significant uncertainty remains over the evolution of Earth’s early nitrogen cycle, particularly how and when it responded to the evolution of oxygenic photosynthesis. Here we apply multi-proxy geochemical analyses (Fe speciation, δ13C and δ15N) to exceptionally well-preserved shales from the approximately 2.7 billion year old Manjeri Formation in the Belingwe Greenstone Belt, Zimbabwe, to evaluate the redox status of Earth’s early nitrogen cycle and decipher feedbacks associated with the initial stages of planetary oxygenation. These continental shelf sediments were previously linked to early cyanobacterial oxygen production, and provide a direct test of conflicting hypotheses concerning the importance of nitrogen oxyanions in the Late Archaean era. Our data reveal a dominantly anaerobic marine nitrogen cycle in which ammonium-replete ferruginous waters underlay an ephemeral oxygen oasis. Driven by the emergence of oxygenic photosynthesis, increased primary productivity could have periodically strengthened export production, which allowed for the accumulation of ammonium in the water column during organic matter degradation. Restricted oxygen availability could have allowed the upwelling ammonium to reach the photic zone to provide ample nitrogen to fuel a prolific Late Archaean biosphere. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	ammonium; Archean; bioavailability; cyanobacterium; nitrogen cycle; oxygen; phosphorus; photosynthesis; primary production; redox conditions; Belingwe Greenstone Belt; Zimbabwe; Cyanobacteria
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124648
作者单位	School of Earth and Environmental Sciences and Centre for Exoplanet Science, University of St Andrews, St Andrews, Fife, United Kingdom; Department of Earth Sciences, Syracuse University, Heroy Geology Laboratory, New York, NY, United States; Department of Earth Sciences, Royal Holloway, University of London, Egham, United Kingdom; Department of Earth, Atmospheric & Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States
推荐引用方式 GB/T 7714	Yang J.,Junium C.K.,Grassineau N.V.,et al. Ammonium availability in the Late Archaean nitrogen cycle[J],2019,12(7).
APA	Yang J..,Junium C.K..,Grassineau N.V..,Nisbet E.G..,Izon G..,...&Zerkle A.L..(2019).Ammonium availability in the Late Archaean nitrogen cycle.Nature Geoscience,12(7).
MLA	Yang J.,et al."Ammonium availability in the Late Archaean nitrogen cycle".Nature Geoscience 12.7(2019).