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Spatiotemporal variations of sedimentary carbon and nitrogen isotopic compositions in the Yangtze Shelf Sea across the Ordovician-Silurian boundary

文献类型：期刊论文

作者Yang, Xiangrong2; Yan, Detian2; Chen, Daizhao1; Liu, Mu1; She, Xiaohui2; Zhang, Bao2; Zhang, Liwei2; Zhang, Junfeng2
刊名PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
出版日期2021-04-01
卷号567页码:17
关键词Hirnantian Carbonate weathering Aerobic nitrogen cycling Yangtze Platform Upwelling Primary Productivity
ISSN号0031-0182
DOI10.1016/j.palaeo.2021.110257
英文摘要The Hirnantian Glaciation resulted in a perturbation in global carbon cycling, which is recognized as a positive excursion in the delta C-13 values of both carbonates and organic matter. To investigate the factors controlling the carbon and nitrogen cycles from the late Ordovician to the early Silurian, the C and N isotopic and geochemical compositions of marine sediments deposited on the Yangtze Platform were measured. The majority of rocks in the Wukemuchang section exhibit high delta N-15(bulk) values, reflecting aerobic nitrogen cycling in the inner shelf. The global spatial variation in delta N-15(bulk) values likely reflects the occurrence of nitrate gradients in seawater, implying that nitrate was limited in offshore environments that were characterized by oxic conditions. More eukaryotes may be restricted to the inner shelf environments, where large amounts of bioavailable nitrate were accessible. The limited availability of nitrate may have affected the fossil distributions and the complexity of animal ecosystems, thereby influencing the late Ordovician extinction and early Silurian biotic recovery. The delta C-13(org) profiles from the Yangtze Platform are consistent with earlier reports of Hirnantian shelf gradients in sedimentary delta C-13(DIC) values. We suggest that the global variation in delta(1)3C(org) values during the late Ordovician was related to the amount of nitrate because productivity is limited when bioavailable N is scarce. In addition to intense carbonate weathering, the high level of photosynthesis in the inner shelf caused by abundant nitrate and nutrients may have enhanced the dissolved inorganic carbon gradient on shelves globally, driving sedimentary delta C-13(org) values even higher than those of sediments deposited in the outer shelf where carbon exchange with the surface ocean was less restricted
资助项目Chinese National Natural Science Foundation[41690131] ; Chinese National Natural Science Foundation[41572327] ; Chinese National Natural Science Foundation[41273001] ; Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan)
WOS研究方向Physical Geography ; Geology ; Paleontology
语种英语
WOS记录号WOS:000636761000027
出版者ELSEVIER
资助机构Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan) ; Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan) ; Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan) ; Chinese National Natural Science Foundation ; Chinese National Natural Science Foundation ; Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan)
源URL[http://ir.iggcas.ac.cn/handle/132A11/101105]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Yan, Detian
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
2.China Univ Geosci, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Xiangrong,Yan, Detian,Chen, Daizhao,et al. Spatiotemporal variations of sedimentary carbon and nitrogen isotopic compositions in the Yangtze Shelf Sea across the Ordovician-Silurian boundary[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2021,567:17.
APA Yang, Xiangrong.,Yan, Detian.,Chen, Daizhao.,Liu, Mu.,She, Xiaohui.,...&Zhang, Junfeng.(2021).Spatiotemporal variations of sedimentary carbon and nitrogen isotopic compositions in the Yangtze Shelf Sea across the Ordovician-Silurian boundary.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,567,17.
MLA Yang, Xiangrong,et al."Spatiotemporal variations of sedimentary carbon and nitrogen isotopic compositions in the Yangtze Shelf Sea across the Ordovician-Silurian boundary".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 567(2021):17.

入库方式： OAI收割

来源：地质与地球物理研究所

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