气候变化领域集成服务门户(CCPortal): Biogeochemical controls on black shale deposition during the Frasnian-Famennian biotic crisis in the Illinois and Appalachian Basins; USA; inferred from stable isotopes of nitrogen and carbon

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DOI	10.1016/j.palaeo.2018.05.031
	Biogeochemical controls on black shale deposition during the Frasnian-Famennian biotic crisis in the Illinois and Appalachian Basins; USA; inferred from stable isotopes of nitrogen and carbon
	Uveges B.T.; Junium C.K.; Boyer D.L.; Cohen P.A.; Day J.E.
发表日期	2019
ISSN	0031-0182
卷号	531
英文摘要	The Frasnian-Famennian biotic crisis is marked by two distinct intervals known as the Lower and Upper Kellwasser Events (KWEs) that in many locations are associated with deposition of organic-rich shales. Sedimentary nitrogen and carbon isotopes offer insight into the biogeochemical processing of nutrients, production of organic matter, and palaeoceanographic conditions during the KWEs. Here we present new bulk nitrogen (δ15Nbulk) and organic carbon (δ13Corg) isotope data from the Late Devonian Appalachian and Illinois Basins (AB and IB), with a focus on intervals encompassing the KWEs. Black shales from the IB and AB, including the KWEs, are 15N-depleted (−1.0–+2.0‰) and have significantly lower δ15Nbulk than interbedded grey shales (+0.5–+4.0‰), a trend consistent with many instances of black shale deposition in the Phanerozoic. Organic carbon isotopes exhibit the broad, positive excursions (~+3.5‰ from background) that are typical of the KWEs globally. Superimposed over these positive excursions in δ13Corg are sharp decreases of up to ~3.0‰ within the black shale beds, to as low as −30.5‰. The pattern of δ15Nbulk and δ13Corg values suggests that the depth of the chemocline and the degree of water-column stratification exert a primary control on both δ15Nbulk and δ13Corg during black shale deposition. In the context of the Frasnian-Famennian biotic crisis, the oscillating redox state and changing temperatures would have likely placed extreme stress on organisms within the marine environment of the AB and IB and may potentially have been a contributing factor to diversity loss over this time period. © 2018 Elsevier B.V.
英文关键词	Chemocline; Devonian; Nutrient cycling; Redox
语种	英语
scopus关键词	black shale; carbon isotope; Devonian; Frasnian-Famennian boundary; lithostratigraphy; marine environment; nitrogen; nitrogen isotope; nutrient cycling; sediment chemistry; stable isotope; stratification; water column; Appalachian Basin; Illinois; United States
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150878
作者单位	Syracuse University, 204 Heroy Geology Lab, 900 S Crouse Drive, Syracuse, NY 13210, United States; Winthrop University, 212B Sims Science Building, 876 Ebenezer Avenue, Rock Hill, SC 29733, United States; Williams College, 203 Clark Hall, 947 Main St, Williamstown, MA 01267, United States; Illinois State University, Femley Hall 206, Campus Box 4400, Normal, IL 61790-4400, United States
推荐引用方式 GB/T 7714	Uveges B.T.,Junium C.K.,Boyer D.L.,et al. Biogeochemical controls on black shale deposition during the Frasnian-Famennian biotic crisis in the Illinois and Appalachian Basins; USA; inferred from stable isotopes of nitrogen and carbon[J],2019,531.
APA	Uveges B.T.,Junium C.K.,Boyer D.L.,Cohen P.A.,&Day J.E..(2019).Biogeochemical controls on black shale deposition during the Frasnian-Famennian biotic crisis in the Illinois and Appalachian Basins; USA; inferred from stable isotopes of nitrogen and carbon.Palaeogeography, Palaeoclimatology, Palaeoecology,531.
MLA	Uveges B.T.,et al."Biogeochemical controls on black shale deposition during the Frasnian-Famennian biotic crisis in the Illinois and Appalachian Basins; USA; inferred from stable isotopes of nitrogen and carbon".Palaeogeography, Palaeoclimatology, Palaeoecology 531(2019).