Sedimentology of the northwestern Weddell Sea continental shelf and slope ...

• Main Author: Brehme, Isa
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1992
• Subjects: Gravity corer Kiel type; Plankton net; ANT-II/3; ANT-VI/3; ANT-X/5; Polarstern; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Planktonic foraminifera; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.782551; https://doi.pangaea.de/10.1594/PANGAEA.782551

Sediment cores on two profiles oriented normaly to the continental shelf and slope, have been investigated to reconstruct the Quaternary sedimentary history of the southeast continental border of South Orkney (NW Weddell Sea). The sediments were described macroscopically and their fabric investigated by use of X-radiographs. Laboratory work comprised detailed grain-size analysis, determination of the watercontent, carbonate, organic carbon and sand fraction.composition. Stable oxygen and carbon isotopes have been measured On planktonic foraminifera. Palaeomagnetism, analysis of 230Th-content and detailed comparison of the lithlogic Parameters with the oxygen isotope stages (Martinson curve) were used for stratigraphic classification of the sediments.The sediment cores from the continental slope comprise a maximum age of 300,000 years B. P.. Bottom currents, ice rafting and biogenic input are the main sources of sediment. Based on lithologic parameters a distinction between glacial and interglacial facies is ... : Further data of ice rafted debris (Table 11.2.1) see datasets: PS1575-1 doi:10.1594/PANGAEA.50207 and PS1172-1 doi:10.1594/PANGAEA.54431.Further data of sediment composition (Tables 11.2.2 to 11.2.4) see datasets: PS1770-3 doi:10.1594/PANGAEA.51549 and PS1172-1 doi:10.1594/PANGAEA.51552.For 230Th excess data of H.-W. Walter (unpubl.) see datasets: doi:10.1594/PANGAEA.50604 and doi:10.1594/PANGAEA.50602. ...