Mathematics – Logic
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..855b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 47, Issue 5, pp.855-862
Mathematics
Logic
62
Scientific paper
In present day marine sediments, almost all of which are deposited in normal oxygenated seawater, rates of burial of organic carbon (C) and pyrite sulfur (S) correlate positively and bear a constant ratio to one another (C/S ~- 3 on a weight basis). By contrast, calculations, based on the isotopic model of and (1981), indicate that at various times during the Phanerozoic the worldwide burial ratio must have been considerably different than the present day value. This ratio change is caused by the requirement that, increases in the worldwide mass of organic carbon must be accompanied by equivalent decreases in the mass of sedimentary pyrite sulfur, in order to maintain a roughly constant level of O 2 in the atmosphere. Such apparently contradictory behavior can be explained if the locus of major organic carbon burial has shifted over time from normal marine environments, as at present, to non-marine freshwater, or to euxinic environments, in the geologic past. A shift to predominantly freshwater burial can help explain predicted high C/S ratios in Permo-Carboniferous sediments, and a shift to euxinic environments can help explain predicted low C/S ratios during the early Paleozoic. It is demonstrated that the three environments today exhibit distinguishably different average C/S ratios.
Berner Robert A.
Raiswell Robert
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