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| Main Authors: | , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2000
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| Online Access: | https://doi.org/10.1594/PANGAEA.730470 |
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| _version_ | 1867167662525644800 |
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| author | Schlünz, Birger Schneider, Ralph R Müller, Peter J Wefer, Gerold |
| author_facet | Schlünz, Birger Schneider, Ralph R Müller, Peter J Wefer, Gerold |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Isotopic and geochemical proxies measured in bulk sediment samples of two gravity cores south of Barbados were used to develop a model for the organic carbon accumulation during the last 250 kyr with respect to the influence of terrestrial sources (e.g. the Orinoco and Amazon rivers) as well as the marine contributions, sea-level, surface currents, and morphological features. Total organic carbon (TOC) content and the stable organic carbon isotopes of the organic matter (delta13Corg) show no glacial to interglacial variability. TOC content is generally very low in both cores but increases between 40 and 120 kyr. A comparable pattern is detected in accumulation rates of the organic matter but is only hinted in the delta13Corg ratios. The results suggest that during the last 250 kyr the organic carbon accumulation south of Barbados has been controlled by glacioeustatic sea-level changes and the general morphologic settings. A sea-level stand of 15-80 m below present day seems generally to favour the accumulation of organic matter south of Barbados. Although delta13Corg ratios reveal no clear trend in the organic matter composition, terrestrial organic carbon discharged by rivers (Orinoco or Amazon) seems not to be a major component in the sediments of that area during the last 250 kyr. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_730470 |
| institution | PANGAEA |
| language | en |
| publishDate | 2000 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Carbon geochemistry of marine sediment south of Barbados Schlünz, Birger Schneider, Ralph R Müller, Peter J Wefer, Gerold Atlantic Caribbean Margin; GeoB3935-2; GeoB3938-1; GeoB3939-1; Gravity corer (Kiel type); M34/4; Meteor (1986); MUC; MultiCorer; SFB261; SL; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents Isotopic and geochemical proxies measured in bulk sediment samples of two gravity cores south of Barbados were used to develop a model for the organic carbon accumulation during the last 250 kyr with respect to the influence of terrestrial sources (e.g. the Orinoco and Amazon rivers) as well as the marine contributions, sea-level, surface currents, and morphological features. Total organic carbon (TOC) content and the stable organic carbon isotopes of the organic matter (delta13Corg) show no glacial to interglacial variability. TOC content is generally very low in both cores but increases between 40 and 120 kyr. A comparable pattern is detected in accumulation rates of the organic matter but is only hinted in the delta13Corg ratios. The results suggest that during the last 250 kyr the organic carbon accumulation south of Barbados has been controlled by glacioeustatic sea-level changes and the general morphologic settings. A sea-level stand of 15-80 m below present day seems generally to favour the accumulation of organic matter south of Barbados. Although delta13Corg ratios reveal no clear trend in the organic matter composition, terrestrial organic carbon discharged by rivers (Orinoco or Amazon) seems not to be a major component in the sediments of that area during the last 250 kyr. |
| title | Carbon geochemistry of marine sediment south of Barbados |
| topic | Atlantic Caribbean Margin; GeoB3935-2; GeoB3938-1; GeoB3939-1; Gravity corer (Kiel type); M34/4; Meteor (1986); MUC; MultiCorer; SFB261; SL; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents |
| url | https://doi.org/10.1594/PANGAEA.730470 |