globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.12.016
论文题名:
Nitrogen and organic carbon isotope stratigraphy of the Yangtze Platform during the Ediacaran-Cambrian transition in South China
作者: Cremonese L.; Shields-Zhou G.A.; Struck U.; Ling H.-F.; Och L.M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 398
起始页码: 165
结束页码: 186
语种: 英语
英文关键词: Cambrian ; Ediacaran ; Marine biogeochemistry ; Nitrogen isotopes ; Organic carbon isotopes ; Yangtze platform
英文摘要: N and Corg isotope results are presented from six sections along a West-East transect in the South China Basin (SCB) covering both shallow and deeper domains, in order to investigate biogeochemical cycling, stratigraphic correlation and isotope systematics over the crucial Ediacaran-Cambrian transition. δ15N bulk values range between -3‰ and +7‰, while δ13Corg values range between -21‰ and -39‰. Similar isotopic trends have been identified for both these proxies across the basin, although hiatuses, differences in depositional setting and syn-depositional bacterial fermentation may have caused some inconsistencies. A trend towards negative N isotope values can be recognized above the Pc-C boundary in both shallow and deeper basin realms across the Yangtze platform. This negative δ15N excursion is probably a response to photic zone anoxia and intense nitrogen fixation/assimilation by diazotrophic cyanobacteria and green/purple sulfur bacteria (GSB and PSB). The Xiaotan section and a composite section from the Yangtze Gorges area show meaningful similarities in their nitrogen isotope trends, interpreted as chemocline fluctuations in the water column that testify to rapid mixing of water overlying the shallow platform. Using carbon isotope stratigraphy, we correlate boundary strata across the platform to test the wider significance of nitrogen isotopic variations. Increased bioturbation and food-chain complexity across the Ediacaran-Cambrian transition probably led to more frequent variations in nitrate isotope composition and related pool dimension during the early Cambrian, reflecting the beginning of a new more biologically controlled era. © 2013 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/69432
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作者单位: Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, United Kingdom; State Key Laboratory of Paleontology and Stratigraphy, NIGPAS, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China; Museum für Naturkunde, Leibniz Institute for Research on Evolution and Biodiversity, Invalidenstraße 43, 10115 Berlin, Germany; State Key Laboratory for Mineral Deposits Research, Nanjing University, 163 Xianlin Road, Nanjing 210023, China; EAWAG, Swiss Federal Institute of Aquatic Science and Technology, CH-6047 Kastanienbaum, Switzerland

Recommended Citation:
Cremonese L.,Shields-Zhou G.A.,Struck U.,et al. Nitrogen and organic carbon isotope stratigraphy of the Yangtze Platform during the Ediacaran-Cambrian transition in South China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,398
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