气候变化领域集成服务门户(CCPortal): A nutrient control on marine anoxia during the end-Permian mass extinction

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DOI	10.1038/s41561-020-0622-1
	A nutrient control on marine anoxia during the end-Permian mass extinction
	Schobben M.; Foster W.J.; Sleveland A.R.N.; Zuchuat V.; Svensen H.H.; Planke S.; Bond D.P.G.; Marcelis F.; Newton R.J.; Wignall P.B.; Poulton S.W.
发表日期	2020
ISSN	17520894
起始页码	640
结束页码	646
卷号	13 期号:9
英文摘要	Oxygen deprivation and hydrogen sulfide toxicity are considered potent kill mechanisms during the mass extinction just before the Permian–Triassic boundary (~251.9 million years ago). However, the mechanism that drove vast stretches of the ocean to an anoxic state is unclear. Here, we present palaeoredox and phosphorus speciation data for a marine bathymetric transect from Svalbard. This shows that, before the extinction, enhanced weathering driven by Siberian Traps volcanism increased the influx of phosphorus, thus enhancing marine primary productivity and oxygen depletion in proximal shelf settings. However, this non-sulfidic state efficiently sequestered phosphorus in the sediment in association with iron minerals, thus restricting the intensity and spatial extent of oxygen-depleted waters. The collapse of vegetation on land immediately before the marine extinction changed the relative weathering influx of iron and sulfate. The resulting transition to euxinic (sulfidic) conditions led to enhanced remobilization of bioavailable phosphorus, initiating a feedback that caused the spread of anoxic waters across large portions of the shelf. This reconciles a lag of >0.3 million years between the onset of enhanced weathering and the development of widespread, but geographically variable, ocean anoxia, with major implications for extinction selectivity. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	anoxic conditions; bioavailability; ecotoxicology; hydrogen sulfide; marine ecosystem; mass extinction; paleoenvironment; Permian; phosphorus; redox conditions; remobilization; trap (geological structure); volcanism; Arctic; Svalbard; Svalbard and Jan Mayen
语种	英语
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/206828
作者单位	School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Museum für Naturkunde, Leibniz Institute for Research on Evolution and Biodiversity, Berlin, Germany; Institute of Geosciences, Universität Potsdam, Potsdam, Germany; Centre for Earth Evolution and Dynamics (CEED), Department of Geosciences, University of Oslo, Oslo, Norway; Department of Geography, Geology and Environment, University of Hull, Hull, United Kingdom; Shell Global Solutions International B.V., Amsterdam, Netherlands; Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; School of Earth Sciences, University College Dublin, Dublin, Ireland
推荐引用方式 GB/T 7714	Schobben M.,Foster W.J.,Sleveland A.R.N.,et al. A nutrient control on marine anoxia during the end-Permian mass extinction[J],2020,13(9).
APA	Schobben M..,Foster W.J..,Sleveland A.R.N..,Zuchuat V..,Svensen H.H..,...&Poulton S.W..(2020).A nutrient control on marine anoxia during the end-Permian mass extinction.Nature Geoscience,13(9).
MLA	Schobben M.,et al."A nutrient control on marine anoxia during the end-Permian mass extinction".Nature Geoscience 13.9(2020).