Progressive expansion of seafloor anoxia in the Middle to Late Ordovician Yangtze Sea: Implications for concurrent decline of invertebrate diversity

doi:10.1016/j.epsl.2022.117858

	Progressive expansion of seafloor anoxia in the Middle to Late Ordovician Yangtze Sea: Implications for concurrent decline of invertebrate diversity
	Zhang, Junpeng 5,6,7,8; Li, Chao 4,7,8; Fang, Xiang 7,8; Li, Wenjie 7,8; Deng, Yiying 4,7,8; Tu, Chenyi 5,6; Algeo, Thomas J.1,2,3; Lyons, Timothy W.5,6; Zhang, Yuandong 4,7,8
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2022-11-15
卷号	598 页码:10
关键词	nitrogen isotopes Mo isotopes ocean redox climatic cooling GOBE biodiversity
ISSN号	0012-821X
DOI	10.1016/j.epsl.2022.117858
通讯作者	Zhang, Junpeng(jpzhang@nigpas.ac.cn)
英文摘要	The Great Ordovician Biodiversification Event (GOBE) achieved its peak during the Middle Ordovician, likely in association with climatic cooling and a rise of atmospheric O2. However, unstable redox states developed widely in contemporaneous epeiric seas, challenging previous assumptions about sustained oceanic oxygenation driven by deep-ocean ventilation in the aftermath of Ordovician cooling. Here, we investigate two Middle-Upper Ordovician shale-dominated successions from intra-shelf basin and slope settings of the Yangtze Sea, South China. Negative shifts in bulk delta 15N and productivity proxies reveal temporal changes in the pattern of nutrient cycling under moderate-to-high productivity conditions, which were likely sustained by increased upwelling of cold and nutrient-rich deep waters in sync with contemporaneous climatic cooling. As a result, marine anoxia likely expanded in deep waters of the Yangtze Sea, as reflected in enrichments of highly reactive iron and redox-sensitive metals (Mo, U). Although moderate Mo abundances (25-50 ppm) and delta 98/95Mo values (+0.4 to +0.8%o) within the euxinic interval suggest that bottom waters had low sulfide concentrations, the delta 98/95Mo values are comparable with those of coeval euxinic facies (- +0.6%o). Furthermore, our modeling results show that low delta 98/95Mo can be produced when sulfidic sinks dominate Mo removal, suggesting that Middle-Late Ordovician oceans may have been less oxygenated than previously assumed, at least for the continental seas of South China, Baltica and Laurentia. These environmental changes may provide a new explanation for the -50% decline of invertebrate species following the peak of GOBE. Our findings thus link the progressive expansion of marine anoxia and climatic cooling to a profound biotic change during the Mid -Late Ordovician Period.(c) 2022 Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China (NSFC)[42030510] ; National Natural Science Foundation of China (NSFC)[41802023] ; Chinese Academy of Sciences[XDB26000000] ; Natural Science Foundation of Jiangsu Province[BK20171103] ; National Science and Technology Major Project[2017ZX05036-001-004] ; China Scholarship Council[201804910207] ; NASA Astrobiology Institute through the Science Mission Directorate[NNA15BB03A] ; NASA Astrobiology Institute through the NASA Interdisciplinary Consortia for Astrobiology Research[NNA15BB03A]
WOS关键词	BIODIVERSIFICATION EVENT GOBE ; SULFUR ; CARBON ; SEDIMENTS ; OXYGENATION ; TRANSITION ; EASTERN ; PLANTS ; FJORD ; BASIN
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000882965200003
资助机构	National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province ; National Science and Technology Major Project ; China Scholarship Council ; NASA Astrobiology Institute through the Science Mission Directorate ; NASA Astrobiology Institute through the NASA Interdisciplinary Consortia for Astrobiology Research
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/41465]
专题	中国科学院南京地质古生物研究所
通讯作者	Zhang, Junpeng
作者单位	1.Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA 2.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China 3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Univ Calif Riverside, Alternat Earths Astrobiol Ctr, Riverside, CA 92521 USA 6.Univ Calif Riverside, Dept Earth & Planetary Sci, Riverside, CA 92521 USA 7.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironment, Nanjing 210008, Jiangsu, Peoples R China 8.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Junpeng,Li, Chao,Fang, Xiang,et al. Progressive expansion of seafloor anoxia in the Middle to Late Ordovician Yangtze Sea: Implications for concurrent decline of invertebrate diversity[J]. EARTH AND PLANETARY SCIENCE LETTERS,2022,598:10.
APA	Zhang, Junpeng.,Li, Chao.,Fang, Xiang.,Li, Wenjie.,Deng, Yiying.,...&Zhang, Yuandong.(2022).Progressive expansion of seafloor anoxia in the Middle to Late Ordovician Yangtze Sea: Implications for concurrent decline of invertebrate diversity.EARTH AND PLANETARY SCIENCE LETTERS,598,10.
MLA	Zhang, Junpeng,et al."Progressive expansion of seafloor anoxia in the Middle to Late Ordovician Yangtze Sea: Implications for concurrent decline of invertebrate diversity".EARTH AND PLANETARY SCIENCE LETTERS 598(2022):10.