Age determination of Southeast Atlantic sediment cores
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2004
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| _version_ | 1867169501183737856 |
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| author | Versteegh, Gerard J M Schefuß, Enno Dupont, Lydie M Marret, Fabienne Sinninghe Damsté, Jaap S Jansen, J H Fred |
| author_facet | Versteegh, Gerard J M Schefuß, Enno Dupont, Lydie M Marret, Fabienne Sinninghe Damsté, Jaap S Jansen, J H Fred |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Angola Basin and Cape Basin (southeast Atlantic) surface sediments and sediment cores show that maxima in the abundance of taraxerol (relative to other land-derived lipids) covary with maxima in the relative abundance of pollen from the mangrove tree genus Rhizophora and that in the surface sediments offshore maxima in the relative abundance of taraxerol occur at latitudes with abundant coastal mangrove forests. Together with the observation that Rhizophora mangle and Rhizophora racemosa leaves are extraordinarily rich in taraxerol, this strongly indicates that taraxerol can be used as a lipid biomarker for mangrove input to the SE Atlantic. The proxy-environment relations for taraxerol and Rhizophora pollen down-core show that increased taraxerol and Rhizophora pollen abundances occur during transgressions and periods with a humid climate. These environmental changes modify the coastal erosion and sedimentation patterns, enhancing the extent of the mangrove ecosystem and/or the transport of mangrove organic matter offshore. Analyses of mid-Pleistocene sediments show that interruption of the pattern of taraxerol maxima during precession minima occurs almost only during periods of low obliquity. This demonstrates the complex environmental response of the interaction between precession-related humidity cycles and obliquity-related sea-level changes on mangrove input. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_740091 |
| institution | PANGAEA |
| language | en |
| publishDate | 2004 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Age determination of Southeast Atlantic sediment cores Versteegh, Gerard J M Schefuß, Enno Dupont, Lydie M Marret, Fabienne Sinninghe Damsté, Jaap S Jansen, J H Fred GeoB; Geosciences, University of Bremen; NIOZ89; PC; Piston corer; SFB261; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Southeast Atlantic; T89-16; T89-16-PC; Tyro Angola Basin and Cape Basin (southeast Atlantic) surface sediments and sediment cores show that maxima in the abundance of taraxerol (relative to other land-derived lipids) covary with maxima in the relative abundance of pollen from the mangrove tree genus Rhizophora and that in the surface sediments offshore maxima in the relative abundance of taraxerol occur at latitudes with abundant coastal mangrove forests. Together with the observation that Rhizophora mangle and Rhizophora racemosa leaves are extraordinarily rich in taraxerol, this strongly indicates that taraxerol can be used as a lipid biomarker for mangrove input to the SE Atlantic. The proxy-environment relations for taraxerol and Rhizophora pollen down-core show that increased taraxerol and Rhizophora pollen abundances occur during transgressions and periods with a humid climate. These environmental changes modify the coastal erosion and sedimentation patterns, enhancing the extent of the mangrove ecosystem and/or the transport of mangrove organic matter offshore. Analyses of mid-Pleistocene sediments show that interruption of the pattern of taraxerol maxima during precession minima occurs almost only during periods of low obliquity. This demonstrates the complex environmental response of the interaction between precession-related humidity cycles and obliquity-related sea-level changes on mangrove input. |
| title | Age determination of Southeast Atlantic sediment cores |
| topic | GeoB; Geosciences, University of Bremen; NIOZ89; PC; Piston corer; SFB261; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Southeast Atlantic; T89-16; T89-16-PC; Tyro |
| url | https://doi.org/10.1594/PANGAEA.740091 |