Japan Geoscience Union Meeting 2014

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Symbol B (Biogeosciences) » B-PT Paleontology

[B-PT23_30AM2] Decoding the history of Earth: From Hadean to Modern

Wed. Apr 30, 2014 11:00 AM - 12:45 PM 411 (4F)

Convener:*Tsuyoshi Komiya(Department of Earth Science & Astronomy Graduate School of Arts and Sciences The University of Tokyo), Yasuhiro Kato(Department of Systems Innovation, Graduate School of Engineering, University of Tokyo), Katsuhiko Suzuki(Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology), Chair:Seishiro Furuyama(Kyushu University)

12:30 PM - 12:45 PM

[BPT23-14] Atmospheric oxygen in the Earth's 4.6-billion-year history

*Tomohiko SATO1, Shigenori MARUYAMA2 (1.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2.Earth-Life Science Institute, Tokyo Institute of Technology)

The oxygen content of the Earth's surface environment is regarded to have increased in two steps; the Great Oxidation Event (ca. 2.4 Ga) around the Archean-Proterozoic boundary and the Neoproterozoic Oxygenation Event (ca. 800-550 Ma). These two events are supported by geochemical or paleobiological evidences; however, the estimation of the oxygenation level of the surface environment through time still have many problems to solve. We will review and discuss the previous researches for the better quantitative estimation of the atmospheric oxygen content in the Earth's 4.6-billion-year history.