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American Journal of Science, Vol. 309, September 2009, P.603-606; doi:10.2475/07.2009.03

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Phanerozoic atmospheric oxygen: New results using the GEOCARBSULF model

Robert A. Berner

Department of Geology and Geophysics, Yale University, P. O. Box 208109, New Haven, Connecticut 06520-8109; email: robert.berner{at}yale.edu

Modifications of the GEOCARBSULF model for Phanerozoic atmospheric oxygen have been made to account for new carbon isotopic data, reconsideration of the fractionation of carbon isotopes between carbonate and organic matter deposited in sediments, and different rates of weathering of volcanic rocks versus granitic rocks. Results indicate distinctly higher O2 values than GEOCARBSULF for the Mesozoic and Cenozoic, lack of an appreciable drop in O2 below 15 percent at any time, and a small late Cenozoic decline of O2 to the present.






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