Radionuclides measured on three sediment cores from the Weddell Sea, Antarctica ...

• Main Authors: Frank, Martin, Eisenhauer, Anton, Bonn, Wolfgang J, Walter, Peter, Grobe, Hannes, Kubik, Peter W, Dittrich-Hannen, Beate, Mangini, Augusto
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1995
• Subjects: Gravity corer Kiel type; ANT-II/3; ANT-IV/3; ANT-VI/3; Polarstern; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Antarc*; Antarctica; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.711504; https://doi.pangaea.de/10.1594/PANGAEA.711504

High resolution 230Thex and 10Be and biogenic barium profiles were measured at three sediment gravity cores (length 605-850 cm) from the Weddell Sea continental margin. Applying the 230Thex dating method, average sedimentation rates of 3 cm/kyr for the two cores from the South Orkney Slope and of 2.4 cm/kyr for the core from the eastern Weddell Sea were determined and compared to delta18O and lithostratigraphic results. Strong variations in the radionuclide concentrations in the sediments resembling the glacial/interglacial pattern of the delta18O stratigraphy and the 10Be stratigraphy of high northern latitudes were used for establishing a chronostratigraphy. Biogenic Ba shows a pattern similar to the radionuclide profiles, suggesting that both records were influenced by increased paleoproductivity at the beginning of the interglacials. However, 230Thex0 fluxes (0 stands for initial) exceeding production by up to a factor of 4 suggest that sediment redistribution processes, linked to variations in bottom ... : Supplement to: Frank, Martin; Eisenhauer, Anton; Bonn, Wolfgang J; Walter, Peter; Grobe, Hannes; Kubik, Peter W; Dittrich-Hannen, Beate; Mangini, Augusto (1995): Sediment redistribution versus paleoproductivity change: Weddell Sea margin sediment stratigraphy and biogenic particle flux of the last 250,000 years deduced from 230Thex, 10Be and biogenic barium profiles. Earth and Planetary Science Letters, 136(3-4), 559-573 ...