(Table 3) Sedimentation rates of stage 1 and last glacial maximum from different Holes during cruises of RRS Discovery in 1984-1985 and 1987-1988, and RRS James Clark Ross in 1992-1993 ...

• Main Authors: Pudsey, Carol J, Howe, John
• Format: Dataset
• Language: English
• Published: PANGAEA 1998
• Subjects: Event label; Sedimentation rate; Gravity corer; Kasten corer; Piston corer; Trigger corer; Calculated from radiolarians; Antarctic; Scotia Sea; The Antarctic; Antarc*
• Online Access: https://dx.doi.org/10.1594/pangaea.767572; https://doi.pangaea.de/10.1594/PANGAEA.767572

Within the Scotia Sea, the axis of the Antarctic Circumpolar Current (ACC) is geographically confined, and sediments therefore contain a record of palaeo-flow speed uncomplicated by ACC axis migration. We outline Holocene and Last Glacial Maximum (LGM) current-controlled sedimentation using data from 3.5-kHz profiles, cores and current meter moorings. Geophysical surveys show areas of erosion and deposition controlled by Neogene basement topography. Deposition occurs in mounded sediment drifts or flatter areas, where 500-1000 m of sediment overlies acoustic basement. 3.5-kHz profiles show parallel, continuous sub-bottom reflectors with highest sedimentation rates in the centre of the drifts, and reflectors converging towards marginal zones of non-deposition. Locally, on the flanks of continental blocks (e.g. South Georgia), downslope processes are dominant. The absence of mudwaves on the sediment drifts may result from the unsteadiness of ACC flow. A core transect from the ACC axis south to the boundary with ...