2025-03-10 東京科学大学
＜関連情報＞
- https://www.isct.ac.jp/ja/news/4dhvtf5mhe91
- https://www.isct.ac.jp/plugins/cms/component_download_file.php?type=2&pageId=&contentsId=1&contentsDataId=981&prevId=&key=8c4c8c1c3eac5cef56879ebb5f2782eb.pdf
- https://www.nature.com/articles/s43247-025-02090-x
激しい火山活動とアルケアン大気の一過性酸素化のメカニズム的関連性 Mechanistic links between intense volcanism and the transient oxygenation of the Archean atmosphere
Yasuto Watanabe,Kazumi Ozaki,Mariko Harada,Hironao Matsumoto & Eiichi Tajika
Communications Earth & Environment Published:10 March 2025
DOI:https://doi.org/10.1038/s43247-025-02090-x
Abstract
The Archean Earth was characterized by a persistent reducing atmosphere, while the occurrence of transient atmospheric oxygenation events—whiff of oxygen—has been suggested, the precise nature and causes of which remain elusive. Here we used a biogeochemical model, corroborating the eruption of large igneous provinces as a plausible mechanistic explanation for these transient oxygenation events. Our results show that biogeochemical dynamics induced by eruptions of large igneous provinces could have caused transient increases in atmospheric oxygen levels lasting for more than several million years. Notably, we show that continental growth would have mitigated conditions for transient oxygenation. This may imply that the whiffs during the late Archean infer that the Earth system was approaching a tipping point for the permanent oxidation of the atmosphere. Our results highlight the mechanistic link between planetary volcanic activities and the dynamic evolution of the atmosphere at the dawn of the Great Oxidation Event.
