Accumulation of organic carbon in marine sediments: results by Ruediger Stein

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By Ruediger Stein

This learn of natural carbon accumulation in marine environments starts off with a overview of mechanisms controlling natural carbon deposition, focusing on effects from expeditions into Baffin Bay and the Labrador Sea, in addition to the ocean of Japan and the northwest coast of Africa. significant gadgets of the research have been the reconstruction of alterations in palaeoceanic variables and the historical past of palaeoclimates in numerous environments. The members additionally constructed extra normal types for natural carbon accumulation and in comparison organic-carbon features derived from diverse analytical ideas which will achieve the best-fitting interpretation version.

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Extra info for Accumulation of organic carbon in marine sediments: results from the Deep Sea Drilling Project Ocean Drilling Program (DSDP ODP)

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2. With increasing maturity, H/C and O/C ratios decrease (Fig. 20). Thus, the H/C vs. O/C diagram may also give information about the level of thermal maturity. , vitrinite reflectance values are less than 0_5 % due to the low thermal stress the organic matter has been exposed to. (2) Rock-Eval pyrolysis Rock-Eval pyrolysis was performed on bulk sediment samples and kerogen concentrates according to Espitali6 et al. (1977). Hydrogen and oxygen contents of the samples, measured as hydrocarbon-type compound and carbon dioxide yields, respectively, were normalized to organic carbon and displayed as hydrogen index (mgHC/gC) and oxygen index (mgCO2/gC).

Higher land plants, on the other hand, are characterized by C/N ratios of more than 15 (Fig. 19; Bordowskiy, 1965a, 1965b; Scheffer and Schachtschabel, 1984). , Stevenson and Cheng, 1972; MiiUer, 1977), causing (too) low C/N ratios. Therefore, in this study the discussion and interpretation of C/N ratios is restricted to organic-carbon-rich sediments, in which the nitrogen is predominantly organic. Ss oAo Atomic ratio O/C Fig. 20: Atomic hydrogen/carbon (H/C) and oxygen/carbon (O/C) ratios of organic matter (kerogen) from different source and different stage of maturity (from Tissot and Welte, 1984).

Degens and Mopper, 1976). Furthermore, about 35 % of the riverine organic matter (about 81 x 106t Corg y-l) belongs to the labile (metabolizable) fraction and may become oxidized already in estuaries and near-shore environments, whereas the other 65% (about 150 x 106t Corg y-l) appears to be highly refractory and may be transported further offshore (Ittekott, 1988). In estuaries, such as the St. Lawrence Estuary, sediments may contain up to about 3 % terrigenous organic carbon (Fig. 13; Tan and Strain, 1979).

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