气候变化领域集成服务门户(CCPortal): Evidence of wildfires and elevated atmospheric oxygen at the Frasnian-Famennian boundary in New York (USA): Implications for the Late Devonian mass extinction

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DOI	10.1130/B35457.1
	Evidence of wildfires and elevated atmospheric oxygen at the Frasnian-Famennian boundary in New York (USA): Implications for the Late Devonian mass extinction
	Liu Z.; Selby D.; Hackley P.C.; Jeffrey Over D.
发表日期	2020
ISSN	167606
起始页码	2043
结束页码	2054
卷号	132 期号:2021-09-10
英文摘要	The Devonian Period experienced significant fluctuations of atmospheric oxygen (O2) levels (~25-13%), for which the extent and timing are debated. Also characteristic of the Devonian Period, at the Frasnian-Famennian (F-F) boundary, is one of the "big five" mass extinction events of the Phanerozoic. Fossilized charcoal (inertinite) provides a record of wildfire events, which in turn can provide insight into the evolution of terrestrial ecosystems and the atmospheric composition. Here, we report organic petrology, programmed pyrolysis analysis, major and trace element analyses, and initial osmium isotope (Osi) stratigraphy from five sections of Upper Devonian (F-F interval) from western New York, USA. These data are discussed to infer evidence of a wildfire event at the F-F boundary. Based on the evidence for a wildfire at the F-F boundary we also provide an estimate of atmospheric O2 levels of ~23-25% at this interval, which is in agreement with the models that predict elevated pO2 levels during the Late Devonian. This, coupled with our Os isotope records, support the currently published Osi data that lacks any evidence for an extra-terrestrial impact or volcanic event at the F-F interval, and therefore to act as a trigger for the F-F mass extinction. The elevated O2 level at the F-F interval inferred from this study supports the hypothesis that pCO2 drawdown and associated climate cooling may have acted as a driving mechanism of the F-F mass extinction. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184738
作者单位	Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; U.S. Geological Survey, MS 956 National Center, Reston, VA 20192, United States; Department of Geological Sciences, State University of New York College at Geneseo, Geneseo, NY 14454, United States; State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Resources, China University of Geosciences, Wuhan, Hubei, 430074, China
推荐引用方式 GB/T 7714	Liu Z.,Selby D.,Hackley P.C.,et al. Evidence of wildfires and elevated atmospheric oxygen at the Frasnian-Famennian boundary in New York (USA): Implications for the Late Devonian mass extinction[J],2020,132(2021-09-10).
APA	Liu Z.,Selby D.,Hackley P.C.,&Jeffrey Over D..(2020).Evidence of wildfires and elevated atmospheric oxygen at the Frasnian-Famennian boundary in New York (USA): Implications for the Late Devonian mass extinction.Bulletin of the Geological Society of America,132(2021-09-10).
MLA	Liu Z.,et al."Evidence of wildfires and elevated atmospheric oxygen at the Frasnian-Famennian boundary in New York (USA): Implications for the Late Devonian mass extinction".Bulletin of the Geological Society of America 132.2021-09-10(2020).