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By Ruediger Stein

This examine of natural carbon accumulation in marine environments starts with a evaluation 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 learn have been the reconstruction of adjustments in palaeoceanic variables and the historical past of palaeoclimates in several environments. The participants additionally built extra basic versions for natural carbon accumulation and in comparison organic-carbon features derived from diverse analytical thoughts to be able to succeed in the best-fitting interpretation version.

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Additional 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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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. 2, Figs. 76 to 78). However, differences occur when details of the data are looked at. 5 °/o o (Fig. 26) and hydrogen index values determined on kerogen concentrates (cf.

O. . . . :. : ! L. - . ~ . l . i°i i°i°! % ! i i°i t. , ..... o.... . . % :i,:~::~:b::::: ..... - . . . . . 0 40 5. 1. Introduction During ODP-Leg 105, holes were drilled at three sites in Baffin Bay and the Labrador Sea (Fig. 27). , 1987). 72" 88" 50" t4° 68" 64 ° 60" 56° ,52" 48" 44" 40* Fig. 27: Location map of Sites 645, 646, and 647. Black arrows indicate surface-water circulation (according to Tchernia, 1982). BIC = Baffin Island Current; LAC = Labrador Current; EGC = East Greenlandcurrent; WGC = West Greenland Current.

Oky 349 0 1 351. Fig, 36- Total organic carbon content at Site 646 (long-term and short-term records). Vertical bar marks a 20ky interval, based on mean sedimentation rate. 6 I J O. 9 a. 2 03 r- e2_ ! ~'. J Q) C 0 0 UJ . J w 1.... I C: / 0 I I 0 I I E ~d j J Fig. 37: Total organic carbon content at Site 647. Stippled field marks interval of major occurrence of biogenic opal according to Bohrmann and Stein (1989).

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