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Persistent oxic deep ocean conditions and frequent volcanic activities during the Frasnian-Famennian transition recorded in South China

文献类型：期刊论文

作者Zhang, Liyu3,4,5; Chen, Daizhao3,4,5; Kuang, Guodun2; Guo, Zenghui4,5; Zhang, Gongjing3,4,5; Wang, Xia1
刊名GLOBAL AND PLANETARY CHANGE
出版日期2020-12-01
卷号195页码:11
关键词Late Devonian Bedded chert Major and trace elements Deep ocean redox condition Volcanic activity Zircon U-Pb dating
ISSN号0921-8181
DOI10.1016/j.gloplacha.2020.103350
英文摘要The Frasnian-Famennian (F-F) transition of Late Devonian was a critical episode in geological history, recording a major mass extinction event. In this study, we focus on an F-F succession from a deep marine context in Bancheng, southern Guangxi, South China, to investigate coeval changes in pelagic environments of the Paleo-Tethys Ocean. The studied succession is exclusively composed of bedded cherts intercalated with multiple siliceous volcanic ash beds. A SIMS zircon U-Pb Concordia age of 367.8 +/- 2.5 Ma is reported for a tuffaceous layer slightly above the F-F boundary. Geochemical ratios of Al/(Al + Fe + Mn), Ce/Ce*, Y/Ho, and Al, Fe contents in bedded cherts indicate that they are of predominantly biogenic/chemical origin with some terrigenous inputs. Negligible enrichment of redox sensitive elements (Mo, U, V) and low V/Cr ratios (<2) suggest persistently oxic conditions existed in the deep pelagic basin at Bancheng, South China during the F-F transition. These findings call into question the widely held hypothesis that marine anoxia was the primary killing mechanism for the F-F crisis. In contrast, multiple tuffaceous layers throughout the F-F boundary succession indicate frequent volcanic activity, which could have released massive amounts of greenhouse gases into the atmosphere, inducing climate warming. This scenario may have increased continental weathering and riverine fluxes into the ocean, reconciling the increases in Al2O3 content and Al/(Al + Fe + Mn) ratio across the F-F boundary. Documentation of persistently oxic conditions and frequent volcanic activitiy provides new perspectives on the inter-relationship between volcanism, climate, and oceanic redox fluctuation during the F-F biotic crisis.
WOS关键词RARE-EARTH-ELEMENTS ; DEVONIAN MASS EXTINCTION ; FRASNIAN/FAMENNIAN BOUNDARY ; DEPOSITIONAL-ENVIRONMENTS ; GEOCHEMICAL RECORDS ; BIOTIC CRISIS ; U-PB ; SEQUENCE STRATIGRAPHY ; KELLWASSER EVENT ; IRON-FORMATIONS
资助项目National Natural Science Foundation of China[91755210] ; National Natural Science Foundation of China[41200260] ; National Natural Science Foundation of China[41072079]
WOS研究方向Physical Geography ; Geology
语种英语
WOS记录号WOS:000592361000002
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 ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/98663]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Chen, Daizhao
作者单位1.Univ Potsdam, Inst Geosci, D-14476 Potsdam, Germany
2.Guangxi Reg Geol Survey Res Inst, Nanning 530023, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, 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 Cenozo Geol & Environm, 19 Beitucheng Xilu, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Liyu,Chen, Daizhao,Kuang, Guodun,et al. Persistent oxic deep ocean conditions and frequent volcanic activities during the Frasnian-Famennian transition recorded in South China[J]. GLOBAL AND PLANETARY CHANGE,2020,195:11.
APA Zhang, Liyu,Chen, Daizhao,Kuang, Guodun,Guo, Zenghui,Zhang, Gongjing,&Wang, Xia.(2020).Persistent oxic deep ocean conditions and frequent volcanic activities during the Frasnian-Famennian transition recorded in South China.GLOBAL AND PLANETARY CHANGE,195,11.
MLA Zhang, Liyu,et al."Persistent oxic deep ocean conditions and frequent volcanic activities during the Frasnian-Famennian transition recorded in South China".GLOBAL AND PLANETARY CHANGE 195(2020):11.

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来源：地质与地球物理研究所

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