. Carbon and the biosphere; proceedings of the 24th Brookhaven symposium in biology, Upton, , May 16-18, 1972. Carbon cycle (Biogeochemistry). SULFUR, NITROGEN, AND CARBON IN THE BIOSPHERE 189 S, 1014 tons T K P IP M D S 0. 634S . 32g 0/oo Fig. 1 Sulfur-isotope age curve, from Holser and 5 Computed total quantities of oceanic sulfur, based on an assumed constant oceanic volume, have been added by Hitchcock and (After Hitchcock and ) temperatures in the Permian and Cretaceous periods, which I find counter- intuitive. Holser and Kaplan 5 suggested that th
. Carbon and the biosphere; proceedings of the 24th Brookhaven symposium in biology, Upton, , May 16-18, 1972. Carbon cycle (Biogeochemistry). SULFUR, NITROGEN, AND CARBON IN THE BIOSPHERE 189 S, 1014 tons T K P IP M D S 0. 634S . 32g 0/oo Fig. 1 Sulfur-isotope age curve, from Holser and 5 Computed total quantities of oceanic sulfur, based on an assumed constant oceanic volume, have been added by Hitchcock and (After Hitchcock and ) temperatures in the Permian and Cretaceous periods, which I find counter- intuitive. Holser and Kaplan 5 suggested that there is a shifting balance between the weathering of sulfur from sediments, which they assume to be chiefly shales, and the deposition of sulfide in the sediments: at times when more light sulfur leaves the ocean than enters it, the concentration of sulfur in the ocean falls, and the 3 S of the remaining sulfate rises. (The scale showing the quantity of sulfur has been added to the diagram, Fig. 1, by Hitchcock and Wechsler.) This, too, is an oversimplified model because it neglects evaporite sulfur, assumes an ocean of constant volume, and makes predictions about the oxygen content of the ocean—atmosphere system which are hard to verify. If we notice that, during high rates of deposition of 32S and sulfide, the mean redox state of the ocean is lower so that black shales can be both formed and preserved in the open ocean, we are suggesting oscillation in the relative proportions of anaerobic environ- ments. If that suggests intensified recycling of biological elements, there are interesting implications for the terrestrial ecology of the Devonian, the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Brookhaven National Laboratory; Woodwell, G. M; Pecan, Erene V. [Washington] Technical Information Center, U.
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