Multivariate statistical analysis on the kaolinite/chlorite ratios from 20 South Atlantic sediment cores

• Main Authors: Krüger, Stefan, Leuschner, Dirk C, Ehrmann, Werner, Schmiedl, Gerhard, Mackensen, Andreas, Diekmann, Bernhard
• Format: Other/Unknown Material
• Language: English
• Published: PANGAEA 2008
• Subjects: Agulhas Basin; Angola Basin; ANT-IX/4; ANT-VIII/3; ANT-X/5; ANT-XI/2; ANT-XI/4; Atlantic Ridge; AWI_Paleo; Cape Basin; Congo Fan; GeoB1034-3; GeoB1035-5; GeoB1214-1; GeoB1401-4; GeoB1710-3; GeoB1712-4; GeoB2821-1; GeoB2822-2; Gravity corer (Kiel type); Indian-Antarctic Ridge; KL; M12/1; M16/1; M20/2; M29/2; M6/6; Meteor (1986); Meteor Rise; Namibia continental slope; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Piston corer (BGR type); Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS16; PS16/278; PS16/284; PS16/311; PS16/321; PS1754-1; PS1756-5; PS1768-8; PS1772-8; PS18; PS18/238; PS2082-1; PS22/817; PS22 06AQANTX_5; PS2319-1; PS2495-3; Antarc*; Antarctic; NADW; North Atlantic Deep Water; North Atlantic; Sea ice; South Atlantic Ocean
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.774777; https://doi.org/10.1594/PANGAEA.774777

Multivariate statistical analysis on the kaolinite/chlorite ratios from 20 South Atlantic sediment cores allowed for the extraction of two processes controlling the fluctuations of the kaolinite/chlorite ratio during the last 130,000 yrs, (1) the relative strength of North Atlantic Deep Water (NADW) inflow into the South Atlantic Ocean and (2) the influx of aeolian sediments from the south African continent. The NADW fluctuation can be traced in the entire deep South Atlantic while the dust signal is restricted to the vicinity of South Africa. Our data indicate that NADW formation underwent significant changes in response to glacial/interglacial climate changes with enhanced export to the Southern Hemisphere during interglacials. The most pronounced phases with Enhanced South African Dust Export (ESADE) occurred during cold Marine Isotope Stage (MIS) 5d and across the Late Glacial/Holocene transition from 16 ka to 4 ka (MIS 2 to 1). This particular pattern is attributed to the interaction of Antarctic Sea Ice extent, the position of the westerlies and the South African monsoon system.