Benthic foraminifera of surface sediments from the continental slope off Sierra Leone, North-West Africa ...

• Main Authors: Zobel, B, Ranke, Ulrich
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1978
• Subjects: Piston corer; Box corer; M30; Meteor 1964; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.548464; https://doi.pangaea.de/10.1594/PANGAEA.548464

On "Meteor" cruise 30 (1973) 22 piston-cores were collected off Sierra Leone from water-depths between about 5000 m (Sierra Leone Basin) and 500 m (upper continental slope) with the objective to study the sediment composition and age as well as processes of sedimentation on the continental slope in a tropical humid region. Granulometric analysis and determinations of the carbonate contents of the sediment samples were carried out, as well as qualitative and quantitative analysis of the components of the grain size fractions > 63 µm and of the planktonic and benthonic foraminifera > 160 µm.Presently, the cold Canary Current influences the composition of the planktonic foraminifera within the northwestern area of investigation (profile A), whereas the planktonic fauna of the eastern area (profile C) seems to be truly tropical. In all Quaternary sediments from the continental slope off Sierra Leone, species of Globorotalia are less abundant than in truly pelagic sediments. For that reason, the zonation of ... : Supplement to: Zobel, B; Ranke, Ulrich (1978): Zusammensetzung, Stratigraphie und Bildungsbedingungen der Sedimente am Kontinentalhang vor Sierra Leone (Westafrika). Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C29, 21-74 ...