Antiquity of Photosynthesis: Possible Constraints from Archaean Carbon Isotope Record
Carbon is stored in the earth’s crust principally as two carbon species: reduced or “organic” carbon (Corg) and oxidized or “carbonate” carbon (Ccarb). With most of the element concentrated in the sedimentary shell, the reduced and oxidized carbon constituents of terrestrial sediments make up the bulk of total carbon residing in the outer skin of the planet.
KeywordsCarbon Isotope Sulfur Isotope Sedimentary Organic Matter Carbonate Carbon Bacterial Sulfate Reduction
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