globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12222
Scopus记录号: 2-s2.0-85007350314
论文题名:
Uncovering the spatial heterogeneity of Ediacaran carbon cycling
作者: Li C.; Hardisty D.S.; Luo G.; Huang J.; Algeo T.J.; Cheng M.; Shi W.; An Z.; Tong J.; Xie S.; Jiao N.; Lyons T.W.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期:2
起始页码: 211
结束页码: 224
语种: 英语
英文关键词: Doushantuo Formation ; Ediacaran carbon cycle ; Shuram excursion ; spatial heterogeneity ; surface-ocean oxygenation
Scopus关键词: carbon cycle ; carbon isotope ; Ediacaran ; heterogeneity ; inorganic carbon ; organic carbon ; oxidation ; oxygenation ; redox conditions ; seawater ; spatial variation ; stratification ; weathering ; China ; Doushantuo Basin ; Guizhou ; Yangtze Platform ; carbon ; carbon cycle ; chemistry ; China ; fossil ; sediment ; Carbon Cycle ; Carbon Isotopes ; China ; Fossils ; Geologic Sediments
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: Records of the Ediacaran carbon cycle (635–541 million years ago) include the Shuram excursion (SE), the largest negative carbonate carbon isotope excursion in Earth history (down to −12‰). The nature of this excursion remains enigmatic given the difficulties of interpreting a perceived extreme global decrease in the δ13C of seawater dissolved inorganic carbon. Here, we present carbonate and organic carbon isotope (δ13Ccarb and δ13Corg) records from the Ediacaran Doushantuo Formation along a proximal-to-distal transect across the Yangtze Platform of South China as a test of the spatial variation of the SE. Contrary to expectations, our results show that the magnitude and morphology of this excursion and its relationship with coexisting δ13Corg are highly heterogeneous across the platform. Integrated geochemical, mineralogical, petrographic, and stratigraphic evidence indicates that the SE is a primary marine signature. Data compilations demonstrate that the SE was also accompanied globally by parallel negative shifts of δ34S of carbonate-associated sulfate (CAS) and increased 87Sr/86Sr ratio and coastal CAS concentration, suggesting elevated continental weathering and coastal marine sulfate concentration during the SE. In light of these observations, we propose a heterogeneous oxidation model to explain the high spatial heterogeneity of the SE and coexisting δ13Corg records of the Doushantuo, with likely relevance to the SE in other regions. In this model, we infer continued marine redox stratification through the SE but with increased availability of oxidants (e.g., O2 and sulfate) limited to marginal near-surface marine environments. Oxidation of limited spatiotemporal extent provides a mechanism to drive heterogeneous oxidation of subsurface reduced carbon mostly in shelf areas. Regardless of the mechanism driving the SE, future models must consider the evidence for spatial heterogeneity in δ13C presented in this study. © 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/85063
Appears in Collections:影响、适应和脆弱性

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作者单位: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Earth Sciences, University of California, Riverside, CA, United States; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, China; Department of Geology, University of Cincinnati, Cincinnati, OH, United States; Faculty of Earth Sciences, China University of Geosciences, Wuhan, China; State Key Laboratory of Marine Environmental Sciences, Xiamen University, Xiamen, China

Recommended Citation:
Li C.,Hardisty D.S.,Luo G.,et al. Uncovering the spatial heterogeneity of Ediacaran carbon cycling[J]. Geobiology,2017-01-01,15(2)
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