Ruediger Stein's Accumulation of organic carbon in marine sediments: results PDF

By Ruediger Stein

ISBN-10: 0387538135

ISBN-13: 9780387538136

This research of natural carbon accumulation in marine environments starts off with a evaluate 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 several environments. The members additionally built extra common types for natural carbon accumulation and in comparison organic-carbon features derived from diversified analytical suggestions so one can achieve the best-fitting interpretation version.

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

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Barium, for example, is distinctly enriched in sediments deposited underneath high-productivity zones. , 1989). , 1990), however, barium as paleoproductivity indicator should be used with caution in areas of varying water depths and in reducing environments. , 1989). This means, the sediment data of a specific variable canl~ot be taken as a direct measure of its production rate in the surface water. Thus, further information about environmental conditions such as, for example, degree of dissolution, oxygen content in the water body or extent of bioturbation, is necessary (see above).

Geological setting and sediments Drilling at Site 645 was performed on the western slope of Baffin Bay (Fig. 27, Tab. 3). 1 meters below sea floor (mbsf). Sediments are of early Miocene to Holocene age and predominantly consists of terrigenous clay, silt and sand; biogenic components are only of minor importance (Fig. 31). , 1989). , 1989; Korstg~d and Nielsen, 1989). Furthermore, the sediments (for normal open-marine sediments) have unusually high organic carbon contents. The sediment sequence at Site 645 is characterized by high mean sedimentation rates of 28 to 135 m/my (Fig.

200' w ,,,, ,,,,,,,,,,,,,,,,,, 100' O~ 0 [] SITE645 100 200 300 400 500 600 700 HYDROGENINDEX (BULK SEDIMENT) Fig. 24: Correlation between hydrogen indices measured on bulk sediment samples and hydrogen indices (mgHC/gC) measured on kerogen concentrates. T/. --ir~. :.. • ¶"= ............. NO 0 0 • • • O 20 30 40 C/N Fig. 25: Correlation between hydrogen indices (mgHCgC) measured on bulk sediment samples and C/N ratios (Site 658). 1. , Tab. 6). In general, the results of all methods are consistent in that they clearly indicate the dominance of marine organic carbon in the 658 sediments (Fig.

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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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