No evidence for high atmospheric oxygen levels 1,400 million years ago
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Zhang et al. (1) recently proposed atmospheric oxygen levels of ∼4% present atmospheric levels (PAL) based on modeling a paleoenvironment reconstructed from trace metal and biomarker data from the 1,400 Ma Xiamaling Formation in China. Intriguingly, this pO2 level is above the threshold oxygen requirements of basal animals and clashes with evidence for atmospheric oxygen levels <<1% PAL in the mid-Proterozoic (2). However, there are fundamental problems with the inorganic and organic geochemical work presented by Zhang et al. (1).
Date issued
2016-04Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary SciencesJournal
Proceedings of the National Academy of Sciences of the United States of America
Publisher
National Academy of Sciences (U.S.)
Citation
Planavsky, Noah J., Devon B. Cole, Christopher T. Reinhard, Charles Diamond, Gordon D. Love, Genming Luo, Shuang Zhang, Kurt O. Konhauser, and Timothy W. Lyons. “No Evidence for High Atmospheric Oxygen Levels 1,400 Million Years Ago.” Proceedings of the National Academy of Sciences 113, no. 19 (April 20, 2016): E2550–E2551.
Version: Final published version
ISSN
0027-8424
1091-6490