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- Ashley P. Gumsley
- Department of Geology, Lund University, Lund 223 62, Sweden;
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- Kevin R. Chamberlain
- Department of Geology and Geophysics, University of Wyoming, Laramie, WY 82071;
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- Wouter Bleeker
- Geological Survey of Canada, Ottawa, ON K1A 0E8, Canada;
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- Ulf Söderlund
- Department of Geology, Lund University, Lund 223 62, Sweden;
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- Michiel O. de Kock
- Department of Geology, University of Johannesburg, Auckland Park 2006, South Africa;
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- Emilie R. Larsson
- Department of Geology, Lund University, Lund 223 62, Sweden;
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- Andrey Bekker
- Department of Geology, University of Johannesburg, Auckland Park 2006, South Africa;
書誌事項
- 公開日
- 2017-02-06
- 権利情報
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- http://www.pnas.org/site/misc/userlicense.xhtml
- DOI
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- 10.1073/pnas.1608824114
- 公開者
- Proceedings of the National Academy of Sciences
この論文をさがす
説明
<jats:title>Significance</jats:title> <jats:p> We present U-Pb ages for the extensive Ongeluk large igneous province, a large-scale magmatic event that took place near the equator in the Paleoproterozoic Transvaal basin of southern Africa at ca. 2,426 Ma. This magmatism also dates the oldest Paleoproterozoic global glaciation and the onset of significant atmospheric oxygenation. This result forces a significant reinterpretation of the iconic Transvaal basin stratigraphy and implies that the oxygenation involved several oscillations in oxygen levels across 10 <jats:sup>−5</jats:sup> present atmospheric levels before the irreversible oxygenation of the atmosphere. Data also indicate that the Paleoproterozoic glaciations and oxygenation were ushered in by assembly of a large continental mass, extensive magmatism, and continental migration to near-equatorial latitudes, mirroring a similar chain of events in the Neoproterozoic. </jats:p>
収録刊行物
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- Proceedings of the National Academy of Sciences
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Proceedings of the National Academy of Sciences 114 (8), 1811-1816, 2017-02-06
Proceedings of the National Academy of Sciences