气候变化领域集成服务门户(CCPortal): Nitrogen and carbon cycle perturbations through the Cenomanian-Turonian oceanic anoxic event 2 (~94 Ma) in the Vocontian Basin (SE France)

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DOI	10.1016/j.palaeo.2019.109443
	Nitrogen and carbon cycle perturbations through the Cenomanian-Turonian oceanic anoxic event 2 (~94 Ma) in the Vocontian Basin (SE France)
	Danzelle J.; Riquier L.; Baudin F.; Thomazo C.; Pucéat E.
发表日期	2020
ISSN	0031-0182
卷号	538
英文摘要	Oceanic Anoxic Event 2, spanning the Cenomanian-Turonian boundary, was an episode of major perturbations in global biogeochemical cycles, characterized by the widespread burial of organic carbon in both oceans and epicontinental basins. In the Vocontian Basin (SE France), this event was expressed by the deposition of the Niveau Thomel, a succession of interbedded dark shales, grey marls and bioturbated carbonates as observed in the Lambruisse section. Analyses of the total organic carbon (TOC) content, combined with the concentrations of redox-sensitive trace elements, revealed that conditions fluctuated from oxic to suboxic-anoxic during the deposition of the Niveau Thomel. Transient periods of deoxygenation were related to perturbations in nutrient cycling reflected by near-zero to negative δ15N signatures indicative of increased diazotrophy. The development of deoxygenated conditions in the Vocontian Basin was likely preconditioned by hydrographically restricted conditions, as confirmed by Mo vs. U enrichments, reducing bottom-water ventilation associated with water-column stratification. Intervals of reoxygenation were likely linked to climate-induced changes. In particular, a phase of regional or global cooling associated with a drop in pCO2, called the Plenus Cold Event (PCE) resulted in vigorous reoxygenation of the Vocontian Basin. © 2019 Elsevier B.V.
英文关键词	Anoxia; Nitrogen isotopes; OAE 2; Redox; Trace elements
语种	英语
scopus关键词	anoxia; carbon cycle; Cenomanian-Turonian boundary; concentration (composition); nitrogen cycle; nitrogen isotope; nutrient cycling; redox conditions; succession; total organic carbon; trace element; France; Vocontian Trough
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/150680
作者单位	Sorbonne Université, CNRS, UMR 7193 ISTeP, 4 Place Jussieu, Paris, 75005, France; Université Bourgogne Franche-Comté, CNRS, UMR 6282 Biogéosciences, 6 Bd Gabriel, Dijon, 21000, France
推荐引用方式 GB/T 7714	Danzelle J.,Riquier L.,Baudin F.,等. Nitrogen and carbon cycle perturbations through the Cenomanian-Turonian oceanic anoxic event 2 (~94 Ma) in the Vocontian Basin (SE France)[J],2020,538.
APA	Danzelle J.,Riquier L.,Baudin F.,Thomazo C.,&Pucéat E..(2020).Nitrogen and carbon cycle perturbations through the Cenomanian-Turonian oceanic anoxic event 2 (~94 Ma) in the Vocontian Basin (SE France).Palaeogeography, Palaeoclimatology, Palaeoecology,538.
MLA	Danzelle J.,et al."Nitrogen and carbon cycle perturbations through the Cenomanian-Turonian oceanic anoxic event 2 (~94 Ma) in the Vocontian Basin (SE France)".Palaeogeography, Palaeoclimatology, Palaeoecology 538(2020).