Dating the rise of atmospheric oxygen
@article{Bekker2004DatingTR, title={Dating the rise of atmospheric oxygen}, author={Andrey Bekker and Heinrich Dick Holland and P.-L. Wang and Douglas Iii Rumble and Holly Stein and Judith L. Hannah and Louise Coetzee and Nicolas Beukes}, journal={Nature}, year={2004}, volume={427}, pages={117-120} }
Several lines of geological and geochemical evidence indicate that the level of atmospheric oxygen was extremely low before 2.45 billion years (Gyr) ago, and that it had reached considerable levels by 2.22 Gyr ago. Here we present evidence that the rise of atmospheric oxygen had occurred by 2.32 Gyr ago. We found that syngenetic pyrite is present in organic-rich shales of the 2.32-Gyr-old Rooihoogte and Timeball Hill formations, South Africa. The range of the isotopic composition of sulphur in…
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The findings suggest that the Great Oxidation Event did not lead to a unidirectional stepwise increase in atmospheric oxygen, and strong positive fractionations in Cr isotopes in the late Neoproterozoic era provide independent support for increased surface oxygenation at that time, which may have stimulated rapid evolution of macroscopic multicellular life.
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The findings point to the persistence of an anoxic early atmosphere, and identify variability within the isotope record that suggests changes in pre-2.45-Gyr-ago atmospheric pathways for non-mass-dependent chemistry and in the ultraviolet transparency of an evolving early atmosphere.
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A high-resolution reconstruction of atmospheric and local oceanic redox conditions across the final two glaciations of the early Palaeoproterozoic era, as documented by marine sediments from the Transvaal Supergroup, South Africa, demonstrates continued oscillations in atmospheric oxygen levels after about 2.32 billion years ago that are linked to major perturbations in ocean redox chemistry and climate.
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- Environmental Science, GeographyNature Communications
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- Geology, Environmental ScienceNature
- 2006
The presence of mass-independently fractionated sulphur isotopes (MIF-S) in many sedimentary rocks older than ∼2.4 billion years has been considered the best evidence for a dramatic change from an anoxic to oxic atmosphere around 2.4 Gyr ago, and the level of atmospheric oxygen fluctuated greatly during the Archaean era.
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- Geography, Environmental ScienceNature
- 2006
High-resolution carbon isotope and sulphur isotope records from the Huqf Supergroup, Sultanate of Oman, that cover most of the Ediacaran period indicate that the ocean became increasingly oxygenated after the end of the Marinoan glaciation and allow us to identify three distinct stages of oxidation.
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- Geology, Environmental ScienceNature
- 2008
A new perspective on ocean oxygenation is presented based on the authigenic accumulation of the redox-sensitive transition element molybdenum in sulphidic black shales, which reflects a greatly expanded oceanic reservoir due to oxygenation of the deep ocean and corresponding decrease in sulphide conditions in the sediments and water column.
Large-scale fluctuations in Precambrian atmospheric and oceanic oxygen levels from the record of U in shales
- Environmental Science
- 2013
Uranium in iron formations and the rise of atmospheric oxygen
- Environmental Science, Geography
- 2013
Global atmospheric oxygen variations recorded by Th/U systematics of igneous rocks
- Geology, Environmental ScienceProceedings of the National Academy of Sciences
- 2019
It is suggested that the secular Th/U evolution of arc igneous rocks could be an effective geochemical indicator recording the global-scale atmospheric oxygen variation.
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