Abstract
Reduced carbon, commonly a residuum of biological activity, has been a conspicuous constituent of sedimentary rocks since the start of the rock record 3.8 × 109 yr ago. The 36,000 Corg assays presently available for Phanerozoic sediments indicate that the average organic carbon content of sedimentary rocks has oscillated around a mean of 0.5 – 0.6% during the last 600 million years. Lack of detailed correlation between observed Corg variations and the isotope age curve of Phanerozoic carbonates raises doubt as to whether all of the variations reported are real. However, the higher organic carbon content of Carboniferous and younger rocks seems to be reflected by more positive levels of the δ13Ccarb which is to be expected from mass balance considerations. Corg assays for Precambrian rocks fall within the scatter of the Phanerozoic data, suggesting that the organic carbon content of Precambrian sediments does not differ significantly from that of geologically younger formations. The constancy of the isotopic fractionation observed between reduced and oxidized carbon throughout the record is best interpreted as the signature of biological activity during the past 3.5 × 109 yr (or possibly 3.8 × 109 yr).
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© 1982 Dr. S. Bernhard, Dahlem Konferenzen, Berlin
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Schidlowski, M. (1982). Content and Isotopic Composition of Reduced Carbon in Sediments. In: Holland, H.D., Schidlowski, M. (eds) Mineral Deposits and the Evolution of the Biosphere. Dahlem Workshop Report, vol 3. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-68463-0_7
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