THE EARLY HISTORY OF ATMOSPHERIC OXYGEN: Homage to Robert M. Garrels

Author:

Canfield D.E.1

Affiliation:

1. Danish Center for Earth System Science (DCESS) and Institute of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark;

Abstract

▪ Abstract  This paper reviews the Precambrian history of atmospheric oxygen, beginning with a brief discussion of the possible nature and magnitude of life before the evolution of oxygenic photosynthesis. This is followed by a summary of the various lines of evidence constraining oxygen levels through time, resulting in a suggested history of atmospheric oxygen concentrations. Also reviewed are the various processes regulating oxygen concentrations, and several models of Precambrian oxygen evolution are presented. A sparse geologic record, combined with uncertainties as to its interpretation, yields only a fragmentary and imprecise reading of atmospheric oxygen evolution. Nevertheless, oxygen levels have increased through time, but not monotonically, with major and fascinating swings to both lower and higher levels.

Publisher

Annual Reviews

Subject

Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Astronomy and Astrophysics

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