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Evolution of nitrogen cycling and primary productivity in the tropics during the Late Ordovician mass extinction

文献类型：期刊论文

作者Chen, Yan4,5,6; Cai, Chunfang1,4,5; Qiu, Zhen2,3; Lin, Wei4,6
刊名CHEMICAL GEOLOGY
出版日期2021-01-05
卷号559页码:9
关键词Yangtze Shelf Sea Nitrogen cycling Primary productivity Late Ordovician mass extinction
ISSN号0009-2541
DOI10.1016/j.chemgeo.2020.119926
英文摘要The late Ordovician is characterized by significant environmental changes in global climate, oceanic redox conditions, as well as a major disaster for marine organisms-the Late Ordovician mass extinction (LOME) (ca. 445 Ma). During this event, planktonic and benthic faunas as well as microbial communities were substantially influenced, and changes in the microbial ecosystems could provide useful clues for the dynamics of marine nutrients and primary production. Here, we utilize new nitrogen isotope (delta N-15(b)ulk) and abundance data, as well as organic carbon accumulation rates (OCARs) from an Ordovician-Silurian (O-S) deep marine section, Tianba, deposited under consistently anoxic water columns in the Yangtze Shelf Sea (South China), to unravel the evolution of nitrogen cycling and primary productivity. The OCARs for Tianba section were the lowest during the sea level low-stands and Hirnantian glaciation maximum but were high at the eve and aftermath of the Hirnantian glaciation maximum, consistent with the OCARs dynamics for another anoxic deep-water section located in Laurentia Block in the tropical ocean. Low OCARs mainly demonstrate that the marine primary productivity was low, with N 2 -fixers populating the ecosystems during the Hirnantian glaciation maximum as evidenced by the spatial distribution of delta N-15(b)ulk, values in the paleotropical waters. However, the high OCARs mainly imply high marine primary productivity right before and after the Hirnantian glaciation maximum in the paleotropics, which were likely fueled by fixed nitrogen sourced from upwellings. The spatial heterogeneity in delta N-15(b)ulk values for the top of Wufeng Formation and coeval strata in the paleotropics suggests that fixed nitrogen species (including NH4+ and NO3-) in surface waters may vary in space. The cooccurrence of zooplankton extinction with spatial variation of delta N-15(b)ulk values suggests that the dynamics of surface waters redox conditions could have played a significant role in the extinction pattern of planktonic faunas during the LOME-1.
WOS关键词ORGANIC-MATTER ACCUMULATION ; UPPER YANGTZE PLATFORM ; CARBON PRESERVATION ; REDOX CONDITIONS ; WATER COLUMN ; SOUTH CHINA ; BLACK-SHALE ; BOTTOM-UP ; TOP-DOWN ; RECORD
资助项目National Natural Science Foundation of China[41602119] ; National Natural Science Foundation of China[41730424] ; Key Research Program of the Institute of Geology & Geophysics, CAS[IGGCAS-201904]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000600546500014
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/99931]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
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Cai, Chunfang; Qiu, Zhen
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Natl Energy Shale Gas Res & Dev Expt Ctr, Langfang 065007, Peoples R China
3.China Natl Petr Corp, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resource Res, Beijing 100029, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Yan,Cai, Chunfang,Qiu, Zhen,et al. Evolution of nitrogen cycling and primary productivity in the tropics during the Late Ordovician mass extinction[J]. CHEMICAL GEOLOGY,2021,559:9.
APA Chen, Yan,Cai, Chunfang,Qiu, Zhen,&Lin, Wei.(2021).Evolution of nitrogen cycling and primary productivity in the tropics during the Late Ordovician mass extinction.CHEMICAL GEOLOGY,559,9.
MLA Chen, Yan,et al."Evolution of nitrogen cycling and primary productivity in the tropics during the Late Ordovician mass extinction".CHEMICAL GEOLOGY 559(2021):9.

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来源：地质与地球物理研究所

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