Computer Science
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1575p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Issue 11, pp.1575-1577
Computer Science
1
Scientific paper
Six Black Sea bottom sediments samples were analyzed for their organic content (chloroform extract and humic compounds) by elemental analysis, liquid and gas chromatography, various chemical methods and especially infra-red spectroscopy. Four of these samples came from an euxinic facies ("unit 2") and two from a normally oxygenated facies below ("unit 3"). Even though important differences exist between the two sets of samples, the origin of the organic matter was found to be the same for both facies; this origin is mixed, with the marine contribution slightly predominant over the terrestrial one. Consequently, the compositional differences originate in the different environmental conditions in the sedimentary basin. More precisely, the euxinic facies appears to "preserve" the organic matter, on both quantitative and qualitative grounds. This effect is due more to the anoxic and toxic nature of the environment than to the reducing conditions. The sulfur incorporation in relatively small molecules does not proceed by a rapid biochemical pathway, but by slow and abiotic reactions.
Debyser Yolande
Pelet Régis
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