Download e-book for kindle: Accumulation of organic carbon in marine sediments: results by Ruediger Stein

By Ruediger Stein

ISBN-10: 0387538135

ISBN-13: 9780387538136

This research 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 items of the learn have been the reconstruction of adjustments in palaeoceanic variables and the heritage of palaeoclimates in several environments. The individuals additionally built extra common types for natural carbon accumulation and in comparison organic-carbon features derived from diverse analytical concepts that allows you 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)

Sample text

Emery and Uchupy, 1984). 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).

When interpreting 613C data it has to be considered, however, that the amount and composition of CO 2 in the deep water are controlled by two factors, (i) the local surface-water productivity and the vertical flux of organic carbon and (ii) the global renewal rate of oxygenated deep water. , 1986). , 24 1986). These alkenones are restricted to a narrow range of algae belonging to the class Prymnesiophyceae, of which Emiliania huxleyi is the most important member today. Thus, changes in alkenone concentrations may give a record of paleoproductivity for an important group of marine algae.

026 PO/100) where PP (in gC m"2 y-l) is the primary productivity, C (in %) the (marine) organic carbon content of the sediment, WBD (in gcm "3) the wet bulk density, and PO (in %) the porosity. This formula is has been used by Stein (1986a) for calculating the paleoproductivities in the Cenomanian/Turonian Atlantic. A more detailed discussion of the assessment of paleoproductivity from organic carbon data using empirical equations was presented by Berger et al. (1989). , 1989 and further references therein).

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Accumulation of organic carbon in marine sediments: results from the Deep Sea Drilling Project Ocean Drilling Program (DSDP ODP) by Ruediger Stein


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