Organic matter variations in the Northwestern Arabian Sea sediments
2001
Khan, Athar Ali | Weijden, C.H. | Reichart, Gert Jan
In this study composition of organic matter and its variations in marine sediments of northwestern Arabian sea has been discussed. This paper presents the geochemical analysis of organic carbon content, C/N and δ13 stable carbon isotope. The primary objective was to investigate the organic matter in sediments below an upwelling area. Undisturbed sediments (Piston core NIOP-486) of late Pleistocene time was collected during Netherlands Indian Ocean Program (NIOP-1992-93). The core NIOP-486 was raised from a depth of 2077 meters near the Owen ridge. This core records deposition history of last 200,000 years and includes 4 warm and 3 cold periods. The distribution of organic carbon content in studied core shows cyclicity during glacial and interglacial stages. The source of organic matter and variations in glacial/interglacial stages are discussed. C/N ratio and δ13 Corg isotope results are described to assess the relative proportions of terrestrial and marine organic matter.
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