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Book Chapter

Waiting for O2

By
Kevin Zahnle
Kevin Zahnle
Space Science Division, National Aeronautics and Space Administration Ames Research Center, MS 245-3, Moffett Field, California 94035, USA
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David Catling
David Catling
Department of Earth and Space Sciences/Astrobiology Program, University of Washington, Seattle, Washington 98195, USA
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Published:
May 01, 2014

Oxygenic photosynthesis appears to be necessary for an oxygen-rich atmosphere like Earth's. However, available geological and geochemical evidence suggests that at least 200 m.y., and possibly as many as 700 m.y., elapsed between the advent of oxygenic photosynthesis and the establishment of an oxygen atmosphere. The interregnum implies that at least one other necessary condition for O2 needed to be met. Here, we argue that the second condition was the oxidation of the surface and crust to the point where free O2 became more stable than competing reduced gases such as CH4, and that the cause of Earth's surface oxidation was the same cause as it is for other planets with oxidized surfaces: hydrogen escape to space. The duration of the interregnum was determined by the rate of hydrogen escape and by the size of the reduced reservoir that needed to be oxidized before O2 became favored. We speculate that hydrogen escape determined the history of continental growth, and we are confident that hydrogen escape provided a progressive bias to biological evolution.

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GSA Special Papers

Earth's Early Atmosphere and Surface Environment

George H. Shaw
George H. Shaw
Geology Department, Union College, Schenectady, New York 12308, USA
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Geological Society of America
Volume
504
ISBN print:
9780813725048
Publication date:
May 01, 2014

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