Early diagenesis of organic matter in recent Black Sea sediments: characterization and source assessment |
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| Affiliation: | 1. School of Geography, Archaeology and Palaeoecology, Queen''s University Belfast, BT7 1NN Northern Ireland, UK;2. Quaternary Sciences, Department of Geology, Lund University, Sölvegatan 12, SE22362 Lund, Sweden;3. Department of Earth Sciences, Uppsala University, Sweden;4. Institute of Geology and Mineralogy, University of Cologne, Zülpicher Str. 49a, D-50674 Cologne, Germany;5. Institute of Geology and Petroleum Technologies Kazan Federal University, Kremlyovskaya Str., 18, 420008 Kazan, Russia;6. School of Natural Science, Technology and Environmental Studies, Södertörn University, SE14189 Huddinge, Sweden;7. Faculty of Soil Science, Moscow State University, Vorobievy Gory, 119899 Moscow, Russia;1. Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark;2. University of Exeter, Camborne School of Mines & Environment and Sustainability Institute, Penryn Campus, Penryn, Cornwall TR10 9FE, UK;3. Instituto Dom Luiz and Departamento de Geologia, Faculdade de Ciências da Universidade de Lisboa, Lisboa 1749-016, Portugal |
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| Abstract: | The organic matter in 9 recent (not more than 250 years old) and ‘organic-rich’ sediments from the southern Black Sea shelf and upper slope have been characterized semi-quantitatively by Pyrolysis/Gas Chromatography/Mass Spectrometry (PY/GC/MS) and13C Cross Polarization Magic Angle Spinning Nuclear Magnetic Resonance (CPMAS-NMR) spectrometry. The organic matter of 7 of the studied sediments was found to be ligno-carbohydrate with a proteinaceous component, one sediment appeared to contain oxidized coal dust and one contained thiophenes in association with pyrite. The ligno component is derived from grasses and soft wood lignin. Material entrapped in an anoxic environment contained the highest proportions of carbohydrate and protein. All the samples had suffered diagenesis as is generally shown by the attachment of carboxyl groups and the removal of methoxyl groups. The evidence suggests that diagenesis occurred whilst the particles traversed the oxic water column. |
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