Late Quaternary deep sea sedimentation off the Niger delta ...
The oxygen isotopes ratios of benthic foraminifera and detailed radiocarbon ages of the organic matter of an over 15 m long sediment core from the outer Niger delta allow us to date the oxygen isotope stage boundaries 1/2 to 11500 (+/- 650) years BP, 2/3 to approximately 23000 (+/- 2000) years BP. T...
| Main Authors: | , , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
1978
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.707458 https://doi.pangaea.de/10.1594/PANGAEA.707458 |
| Summary: | The oxygen isotopes ratios of benthic foraminifera and detailed radiocarbon ages of the organic matter of an over 15 m long sediment core from the outer Niger delta allow us to date the oxygen isotope stage boundaries 1/2 to 11500 (+/- 650) years BP, 2/3 to approximately 23000 (+/- 2000) years BP. The composition of the predominantly terrigenous clays and accessory pelagic fossils reflects the evolution of the climate over the southwestern Sahel zone and the response of the Eastern Tropical Atlantic to these climatic fluctuations during the Late Quaternary.The dilution of the pelagic fossil concentrations by the terrigenous material and the oxygen isotopes ratios of planktonic foraminifera indicate large fluctuations in the freshwater discharge from the Niger, with high precipitations over the drainage area of this river from 4500 (+/- 300) to 11500 (+/- 650) years BP and from 11800 (+(- 600) to 13000 (+/- 600) years BP while the time intervals in between were as dry as today. Relative increase of kaolinite ... : Supplement to: Pastouret, L; Chamley, Hervè; Delibrias, G; Duplessy, Jean-Claude; Thiede, Jörn (1978): Late quaternary climatic changes in western tropical Africa deduced from deep-sea sedimentation off Niger delta. Oceanologica Acta, 1(2), 217-232 ... |
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