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Comparison of Ediacaran platform and slope delta U-238 records in South China: Implications for global-ocean oxygenation and the origin of the Shuram Excursion
Cao, Mengchun1,2,3; Daines, Stuart J.4; Lenton, Timothy M.4; Cui, Huan5,6,7; Algeo, Thomas J.8,9,10; Dahl, Tais W.2; Shi, Wei8; Chen, Zhong-Qiang8; Anbar, Ariel11,12; Zhou, Yao-Qi1
2020-10-15
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
Volume287Pages:111-124
Abstract

The Ediacaran Shuram negative carbon isotope excursion (SE) records major paleoceanographic changes during the late Neoproterozoic, possibly linked to a global oceanic oxygenation event, yet its cause(s) remain uncertain. Earlier studies of the upper Ediacaran Doushantuo Formation in South China based on local redox proxies have documented strong spatial redox heterogeneity along shelf-to-basin transects, but variations of delta U-238 (a global redox proxy) have not yet been examined in deep-water SE carbonates. In this study, we examined delta U-238 variations through the SE in the upper slope Siduping section. Similar to platform SE sections, Siduping exhibits a shift toward higher delta U-238 values correlative with the peak of the SE (i.e., maximum negative delta C-13(carb)), confirming inferences of global ocean oxygenation during the SE. This raises an apparent paradox, because a global negative carbon isotope excursion implies net oxidant consumption, requiring an ocean-based oxygenation mechanism. We hypothesize that an increase in the efficiency of phosphorus burial due to a plankton-driven shift from dominantly dissolved organic matter (DOM) cycling to greater particulate organic matter (POM) export depleted the ocean of nutrient phosphorus. By producing a steep redox gradient close to the sediment-water interface, we suggest that ocean oxygenation also triggered a globally simultaneous diagenetic event in which isotopically light delta C-13(carb) was precipitated in authigenic carbonate minerals. This scenario can account for delta U-238 differences between shallow-water and deep-water carbonates, which reflect precipitation of relatively larger amounts of authigenic carbonate minerals in shallow-water settings, generating both a larger negative delta C-13(carb) shift and a larger early diagenetic delta U-238 offset. (C) 2020 Published by Elsevier Ltd.

KeywordCarbon isotopes Uranium isotopes Neoproterozoic Ocean redox CIE Doushantuo
DOI10.1016/j.gca.2020.04.035
Indexed BySCI
Language英语
WOS KeywordURANIUM ISOTOPE FRACTIONATION ; DOUSHANTUO FORMATION ; ANAEROBIC OXIDATION ; CARBON ; ANOXIA ; U-238/U-235 ; EVOLUTION ; METHANE ; COPRECIPITATION ; PRESERVATION
Funding ProjectNational Natural Science Foundation of China[41772190] ; Fundamental Research Funds for the Central Universities[18CX06026A] ; Danish Council for Independent Research[DFF - 7014-00295] ; Carlsberg Foundation[CF16-0876] ; Natural Environment Research Council[NE/P013651] ; Natural Environment Research Council[NE/N018508/1] ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000570270000007
Funding OrganizationNational Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Danish Council for Independent Research ; Carlsberg Foundation ; Natural Environment Research Council ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/32562
Collection中国科学院南京地质古生物研究所
Corresponding AuthorCao, Mengchun
Affiliation1.China Univ Petr East China, Sch Geosci, Qingdao 266580, Shandong, Peoples R China
2.Univ Copenhagen, GLOBE Inst, DK-1350 Copenhagen K, Denmark
3.Univ Copenhagen, IGN, Fac Sci, DK-1350 Copenhagen K, Denmark
4.Univ Exeter, Global Syst Inst, Exeter EX4 4QE, Devon, England
5.Vrije Univ Brussel, Div Earth Syst Sci, Analyt Environm & Geochem Grp, Brussels, Belgium
6.ET HOME Evolut & Tracers Habitabil Mars & Earth, Astrobiol Res Consortium, Brussels, Belgium
7.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
8.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan, Peoples R China
9.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China
10.Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA
Recommended Citation
GB/T 7714
Cao, Mengchun,Daines, Stuart J.,Lenton, Timothy M.,et al. Comparison of Ediacaran platform and slope delta U-238 records in South China: Implications for global-ocean oxygenation and the origin of the Shuram Excursion[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2020,287:111-124.
APA Cao, Mengchun.,Daines, Stuart J..,Lenton, Timothy M..,Cui, Huan.,Algeo, Thomas J..,...&Zhou, Yao-Qi.(2020).Comparison of Ediacaran platform and slope delta U-238 records in South China: Implications for global-ocean oxygenation and the origin of the Shuram Excursion.GEOCHIMICA ET COSMOCHIMICA ACTA,287,111-124.
MLA Cao, Mengchun,et al."Comparison of Ediacaran platform and slope delta U-238 records in South China: Implications for global-ocean oxygenation and the origin of the Shuram Excursion".GEOCHIMICA ET COSMOCHIMICA ACTA 287(2020):111-124.
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