Archaean palaeosols and Archaean air (reply)

Hiroshi Ohmoto () and Yumiko Watanabe
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Hiroshi Ohmoto: Pennsylvania State University
Yumiko Watanabe: Pennsylvania State University

Nature, 2004, vol. 432, issue 7016, 1-2

Abstract: Abstract Ohmoto et al. reply - The idea of a methane-rich Archaean atmosphere has become popular since Rye et al. assumed in their calculation1 that siderite was absent in pre-2.2-Gyr palaeosols. We have concluded that the absence of siderite in some Archaean palaeosols does not constrain the atmospheric pCO2, but the presence of much siderite in sedimentary rocks does2. Sleep's recognition3 that siderite occurs in Archaean palaeosols substantiates our arguments2: although siderite should be absent in well aerated soils of all geological ages, it may form in waterlogged soils where pO2 became less than about 10−60 atm owing to the abundant anaerobic production of H2. In fact, we have reported this in a 2.6-Gyr soil profile at Schagen, South Africa4: abundant ferric-rich minerals formed while the soil was exposed to air, but ferrous-rich carbonate formed while it was apparently submerged under an anoxic pond.

Date: 2004
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DOI: 10.1038/nature03168

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