globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12178
Scopus记录号: 2-s2.0-85027949869
论文题名:
Environmental context for the terminal Ediacaran biomineralization of animals
作者: Cui H.; Kaufman A.J.; Xiao S.; Peek S.; Cao H.; Min X.; Cai Y.; Siegel Z.; Liu X.-M.; Peng Y.; Schiffbauer J.D.; Martin A.J.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2016
卷: 14, 期:4
起始页码: 344
结束页码: 363
语种: 英语
Scopus关键词: antimicrobial activity ; benthos ; biomineralization ; carbon isotope ; Ediacaran ; evolutionary biology ; facies ; fossil record ; limestone ; microbial community ; organic matter ; paleontology ; primary production ; pyrite ; stable isotope ; sulfate ; weathering ; China ; Gaojiashan ; Shaanxi ; Animalia ; Cloudina
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: In terminal Ediacaran strata of South China, the onset of calcareous biomineralization is preserved in the paleontological transition from Conotubus to Cloudina in repetitious limestone facies of the Dengying Formation. Both fossils have similar size, funnel-in-funnel construction, and epibenthic lifestyle, but Cloudina is biomineralized, whereas Conotubus is not. To provide environmental context for this evolutionary milestone, we conducted a high-resolution elemental and stable isotope study of the richly fossiliferous Gaojiashan Member. Coincident with the first appearance of Cloudina is a significant positive carbonate carbon isotope excursion (up to +6‰) and an increase in the abundance and 34S composition of pyrite. In contrast, δ34S values of carbonate-associated sulfate remain steady throughout the succession, resulting in anomalously large (>70‰) sulfur isotope fractionations in the lower half of the member. The fractionation trend likely relates to changes in microbial communities, with sulfur disproportionation involved in the lower interval, whereas microbial sulfate reduction was the principal metabolic pathway in the upper. We speculate that the coupled paleontological and biogeochemical anomalies may have coincided with an increase in terrestrial weathering fluxes of sulfate, alkalinity, and nutrients to the depositional basin, which stimulated primary productivity, the spread of an oxygen minimum zone, and the development of euxinic conditions in subtidal and basinal environments. Enhanced production and burial of organic matter is thus directly connected to the carbon isotope anomaly, and likely promoted pyritization as the main taphonomic pathway for Conotubus and other soft-bodied Ediacara biotas. Our studies suggest that the Ediacaran confluence of ecological pressures from predation and environmental pressures from an increase in seawater alkalinity set the stage for an unprecedented geobiological response: the evolutionary novelty of animal biomineralization. © 2016 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85100
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Geology, University of Maryland, College Park, MD, United States; Department of Geoscience and NASA Astrobiology Institute, University of Wisconsin-Madison, Madison, WI, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Department of Geosciences, Virginia Tech, Blacksburg, VA, United States; Department of Geology, Northwest University, Xi'an, China; Bethesda-Chevy Chase High School, Bethesda, MD, United States; Department of Geological Sciences, University of North Carolina, Chapel Hill, NC, United States; Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, United States; Department of Geological Sciences, University of Missouri, Columbia, MO, United States; División de Geociencias Aplicadas, IPICYT, San Luis Potosí, Mexico; United States Geological Survey, Menlo Park, CA, United States; College of Earth Sciences, Jilin University, Changchun, China

Recommended Citation:
Cui H.,Kaufman A.J.,Xiao S.,et al. Environmental context for the terminal Ediacaran biomineralization of animals[J]. Geobiology,2016-01-01,14(4)
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