globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.07.018
论文题名:
Perturbation of the marine nitrogen cycle during the Late Ordovician glaciation and mass extinction
作者: Luo G.; Algeo T.J.; Zhan R.; Yan D.; Huang J.; Liu J.; Xie S.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 448
起始页码: 339
结束页码: 348
语种: 英语
英文关键词: Glaciation ; Hirnantian ; Mass extinction ; N2O ; Nitrogen cycle ; South China
英文摘要: The Late Ordovician was a critical interval in geologic history, during which both the biosphere and marine environments underwent severe perturbations, including one of the 'Big Five' Phanerozoic mass extinctions and the massive but short-term (~0.5-Myr) Hirnantian glaciation. The onset and termination of the Hirnantian glaciation have been widely accepted as the triggers for the two extinction pulses that comprise the Late Ordovician biocrisis, but the mechanisms that caused the Hirnantian glaciation itself remain poorly known. Here, we analyze the nitrogen isotope composition (δ15N) of two sections in South China (Wangjiawan and Nanbazi) in order to better understand nitrogen cycle perturbations in the Late Ordovician ocean and their relationship to contemporaneous climatic and biogeochemical changes. Low δ15N (~1‰) in the upper Katian and lower Rhuddanian of both sections suggests intensive (i.e., near-quantitative) denitrification and, thus, nitrogen fixation as the main source of biologically available nitrogen for primary producers. A positive δ15N excursion in both sections during the Hirnantian indicates weaker (i.e., non-quantitative) denitrification, possibly as a result of more vigorous thermohaline circulation and improved ocean ventilation. Weaker denitrification would have reduced the flux of N2O, an intermediate product of denitrification, to the atmosphere. N2O is a potent greenhouse gas, and a major decline in its production would have led to cooler climatic conditions and, ultimately, the Hirnantian glaciation. A global survey of published nitrogen isotope records suggests that similar processes operated broadly within the Late Ordovician global ocean. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68507
Appears in Collections:过去全球变化的重建

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作者单位: State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan, China; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, United States; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China; Department of Geology, University of Cincinnati, Cincinnati, OH, United States; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, China; Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, China

Recommended Citation:
Luo G.,Algeo T.J.,Zhan R.,et al. Perturbation of the marine nitrogen cycle during the Late Ordovician glaciation and mass extinction[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,448
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