Geochemistry of Southern Ocean sediments ...

• Main Authors: Noble, Taryn L, Piotrowski, Alexander M, Robinson, Laura F, McManus, Jerry F, Hillenbrand, Claus-Dieter, Bory, Aloys J-M
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2012
• Subjects: Drilling/drill rig; Sampling by hand; Gravity corer; Kasten corer; Giant box corer; Gravity corer Kiel type; Composite Core; Box corer; Leg177; ANT-XIV/3; CD129; Joides Resolution; Polarstern; Charles Darwin; Ocean Drilling Program ODP; Antarc*; Antarctica; South Sandwich Islands; Southern Ocean; West Antarctica
• Online Access: https://dx.doi.org/10.1594/pangaea.783844; https://doi.pangaea.de/10.1594/PANGAEA.783844

Reconstructing past detrital flux and provenance in the Southern Ocean provides information about changes in source regions associated with climate variations and transport pathways. We present a Last Glacial Maximum (LGM) to Holocene comparison of 230Th normalised fluxes combined with sediment provenance data (Pb, Nd and Sr isotopes) from a latitudinal core transect in the eastern Atlantic sector of the Southern Ocean (ODP Leg 177 cores). We compare the radiogenic isotopic composition (IC) of detritus in these cores to that of cores proximal to potential source areas.We observe a well-defined latitudinal Holocene gradient in both detrital flux and provenance of sediment. High detrital fluxes in the north are associated with terrigenous material derived from southern Africa, while low detrital fluxes in the south are associated with supply from southern South America, West Antarctica and the South Sandwich Islands. The data suggest that this well-defined Holocene gradient in detrital flux and sediment ... : Supplement to: Noble, Taryn L; Piotrowski, Alexander M; Robinson, Laura F; McManus, Jerry F; Hillenbrand, Claus-Dieter; Bory, Aloys J-M (2012): Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period. Earth and Planetary Science Letters, 317-318, 374-385 ...