By Ruediger Stein
This research of natural carbon accumulation in marine environments starts off with a overview of mechanisms controlling natural carbon deposition, targeting effects from expeditions into Baffin Bay and the Labrador Sea, in addition to the ocean of Japan and the northwest coast of Africa. significant items of the research have been the reconstruction of adjustments in palaeoceanic variables and the historical past of palaeoclimates in several environments. The individuals additionally constructed extra normal types for natural carbon accumulation and in comparison organic-carbon features derived from diverse analytical suggestions with a view to succeed in 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)
Prahl and Muehlhausen, 1989). It has to be considered, however, that these biomarker data give detailed information only about the extractable organic fraction which is generally only a small proportion of the total organic matter fraction. When using biomarker data one has to assume that the extractable organic matter fraction is representative for the entire organic matter in a sediment which is known to not always be the case. C= Z hl -- X IJLI -22 0 200 400 600 800 0 -22 100 200 300 40o DELTA -2 i DELTA -2 !
1986). The recent data from ODP-Sites 645 and 658 also fit into this correlation (Fig. 23). , 1984). Rock-Eval pyrolysis performed on kerogen concentrates from the same samples may yield distinctly higher hydrogen index values (Fig. 24). Thus, before interpreting low hydrogen index values in terms of terrigenous organic carbon dominantly being present in the organic #action, one should use additional methods to support this interpretation, such as maceral composition, ,~13Corg, or C/N ratios.
This is important for high-resolution studies of paleoclimate and paleoceanography. 0 200 (1', 400 '-" 600 a 800 42) 1000 ~ 1200 '"J 0 I 10 ~ 1 20 (SEDIMENTATION RATESM/MY] ~ ! 30 * I 40 i It 50 ~ I 60 Age CMa) Fig. , 1989). 4. 1. Quantity of organic carbon and carbonate content Almost all of the sediment sequence at Site 645 is characterized by TOC values that are distinctly higher than those recorded in normal open-marine environments. 5% and 3% (Fig. 33). , in the upper Pliocene to Holocene sediments.