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Phosphogenesis associated with the Shuram Excursion: Petrographic and geochemical observations from the Ediacaran Doushantuo Formation of South China
Cui, Huan1,2,3; Xiao, Shuhai4; Zhou, Chuanming (周传明)5; Peng, Yongbo6; Kaufman, Alan J.3,7; Plummer, Rebecca E.3
2016-07-15
Source PublicationSEDIMENTARY GEOLOGY
ISSN0037-0738
Volume341Pages:134-146
Abstract

The Ediacaran Period witnessed one of the largest phosphogenic events in Earth's history. Coincidently, some phosphorite deposits in South China are associated with the largest-known carbon isotope negative excursion (i.e., Shuram Excursion), suggesting an intimate coupling of the biogeochemical carbon and phosphorous cycles. However, the geomicrobiological linkage between these anomalies remain poorly understood. In this study, we investigated the phosphorite samples from the uppermost Doushantuo Formation in South China. Carbon isotope compositions of authigenic calcite cements and nodules in the phosphorites are as low as -34 parts per thousand (VPDB). Petrographic and geochemical investigations indicate that the C-13-depleted carbonates likely formed as the result of microbial sulfate and iron reduction that released phosphorous from iron oxyhydroxide, concentrating phosphorous in pore waters, and thereby promoting phosphate mineralization. The timing of this event appears to coincide with enhanced sulfate delivery to seawater through continental weathering. The basin-scale distribution of Doushantuo phosphorites suggests a redox control on the availability of iron oxyhydroxide and the recycling of pore water phosphorous. Both inner and outer shelf regions were likely characterized by an oxic water column, and were the main loci for phosphogenesis; on the contrary, intra-shelf and slope regions, which are lean in phosphorite, were subjected to euxinic or ferruginous water column conditions. The intimate coupling between Ediacaran phosphogenesis and the Shuram Excursion suggests strong links among seawater redox conditions, C-S-P-Fe cycling, and fossil phosphatization. Increased microbial sulfate reduction driven by enhanced sulfate reservoir in the Ediacaran ocean may have played an essential role on these biogeochemical events. (C) 2016 Elsevier B.V. All rights reserved.

KeywordPhosphogenesis Sulfate-methane Transition Zone Microbial Sulfate Reduction Authigenic Carbonates Shuram Excursion C-s-p-fe Cycles
DOI10.1016/j.sedgeo.2016.05.008
Language英语
WOS KeywordProterozoic Cyanobacterial Blooms ; Fossil Preservation ; Atmospheric Oxygen ; Phosphorus Cycle ; Biogenic Methane ; Yangtze Platform ; Early Evolution ; Trace Fossil ; Black-sea ; Ocean
Funding ProjectNASA Exobiology[NNX12AR91G] ; NASA Exobiology[NNX15AL27G] ; NSF Sedimentary Geology and Paleontology program[EAR-0844270] ; NSF Sedimentary Geology and Paleontology program[EAR-1528553] ; Society of Economic Geologists Student Research Grant ; Explorers Club Exploration Fund Grant ; American Association of Petroleum Geologists ; NASA Astrobiology Institute in the University of Wisconsin Madison
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000381540200009
Funding OrganizationNASA Exobiology ; NSF Sedimentary Geology and Paleontology program ; Society of Economic Geologists Student Research Grant ; Explorers Club Exploration Fund Grant ; American Association of Petroleum Geologists ; NASA Astrobiology Institute in the University of Wisconsin Madison
PublisherELSEVIER SCIENCE BV
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Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/12383
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorCui, Huan
Affiliation1.Univ Wisconsin, Dept Geosci, Madison, WI 53706 USA
2.Univ Wisconsin, NASA Astrobiol Inst, Madison, WI 53706 USA
3.Univ Maryland, Dept Geol, College Pk, MD 20742 USA
4.Virginia Tech, Dept Geosci, Blacksburg, VA 24061 USA
5.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Key Lab Econ Stratig & Palaeogeog, Nanjing 210008, Jiangsu, Peoples R China
6.Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA
7.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA
Recommended Citation
GB/T 7714
Cui, Huan,Xiao, Shuhai,Zhou, Chuanming ,et al. Phosphogenesis associated with the Shuram Excursion: Petrographic and geochemical observations from the Ediacaran Doushantuo Formation of South China[J]. SEDIMENTARY GEOLOGY,2016,341:134-146.
APA Cui, Huan,Xiao, Shuhai,Zhou, Chuanming ,Peng, Yongbo,Kaufman, Alan J.,&Plummer, Rebecca E..(2016).Phosphogenesis associated with the Shuram Excursion: Petrographic and geochemical observations from the Ediacaran Doushantuo Formation of South China.SEDIMENTARY GEOLOGY,341,134-146.
MLA Cui, Huan,et al."Phosphogenesis associated with the Shuram Excursion: Petrographic and geochemical observations from the Ediacaran Doushantuo Formation of South China".SEDIMENTARY GEOLOGY 341(2016):134-146.
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