DOI: 10.1038/NGEO2434
论文题名: A global transition to ferruginous conditions in the early Neoproterozoic oceans
作者: Guilbaud R. ; Poulton S.W. ; Butterfield N.J. ; Zhu M. ; Shields-Zhou G.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 6 起始页码: 1
结束页码: 5
语种: 英语
Scopus关键词: eukaryote
; evolutionary biology
; global ocean
; iron
; isotopic analysis
; latitude
; Proterozoic
; redox conditions
; supercontinent
; surface water
; weathering
; Eukaryota
英文摘要: Eukaryotic life expanded during the Proterozoic eon1, 2.5 to 0.542 billion years ago, against a background of fluctuating ocean chemistry2-4. After about 1.8 billion years ago, the global ocean is thought to have been characterized by oxygenated surface waters, with anoxic and sulphidic waters in middle depths along productive continental margins and anoxic and iron-containing (ferruginous) deeper waters5-7. The spatial extent of sulphidic waters probably varied through time5,6, but this surface-to-deep redox structure is suggested to have persisted until the first Neoproterozoic glaciation about 717 million years ago8-11. Here we report an analysis of ocean redox conditions throughout the Proterozoic using new and existing iron speciation and sulphur isotope data from multiple cores and outcrops. We find a global transition from sulphidic to ferruginous mid-depth waters in the earliest Neoproterozoic, coincident with the amalgamation of the supercontinent Rodinia at low latitudes. We suggest that ferruginous conditions were initiated by an increase in the oceanic influx of highly reactive iron relative to sulphate, driven by a change in weathering regime and the uptake of sulphate by extensive continental evaporites on Rodinia. We proposethat this transition essentially detoxified oceanmargin settings, allowing for expanded opportunities for eukaryote diversification followingaprolonged evolutionary stasis before one billion years ago. © 2015 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106331
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology, Nanjing, China; Department of Earth Sciences, University College London, London, United Kingdom
Recommended Citation:
Guilbaud R.,Poulton S.W.,Butterfield N.J.,et al. A global transition to ferruginous conditions in the early Neoproterozoic oceans[J]. Nature Geoscience,2015-01-01,8(6)