globalchange  > 气候变化事实与影响
Scopus记录号: 2-s2.0-85062065459
论文题名:
Fully oxygenated water columns over continental shelves before the Great Oxidation Event
作者: Ostrander C.M.; Nielsen S.G.; Owens J.D.; Kendall B.; Gordon G.W.; Romaniello S.J.; Anbar A.D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2019
语种: 英语
英文摘要: Late Archaean sedimentary rocks contain compelling geochemical evidence for episodic accumulation of dissolved oxygen in the oceans along continental margins before the Great Oxidation Event. However, the extent of this oxygenation remains poorly constrained. Here we present thallium and molybdenum isotope compositions for anoxic organic-rich shales of the 2.5-billion-year-old Mount McRae Shale from Western Australia, which previously yielded geochemical evidence of a transient oxygenation event. During this event, we observe an anticorrelation between thalium and molybdenum isotope data, including two shifts to higher molybdenum and lower thalium isotope compositions. Our data indicate pronounced burial of manganese oxides in sediments elsewhere in the ocean at these times, which requires that the water columns above portions of the ocean floor were fully oxygenated—all the way from the air–sea interface to well below the sediment–water interface. Well-oxygenated continental shelves were probably the most important sites of manganese oxide burial and mass-balance modelling results suggest that fully oxygenated water columns were at least a regional-scale feature of early Earth’s oceans 2.5 billion years ago. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122624
Appears in Collections:气候变化事实与影响

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作者单位: School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States; NIRVANA Laboratories, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Earth, Ocean, and Atmospheric Science, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, United States; Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada; School of Molecular Sciences, Arizona State University, Tempe, AZ, United States

Recommended Citation:
Ostrander C.M.,Nielsen S.G.,Owens J.D.,et al. Fully oxygenated water columns over continental shelves before the Great Oxidation Event[J]. Nature Geoscience,2019-01-01
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