Sedimentary record of the western Amundsen Sea Embayment after the last glacial maximum ...

• Main Authors: Hillenbrand, Claus-Dieter, Smith, James A, Kuhn, Gerhard, Esper, Oliver, Gersonde, Rainer, Larter, Robert D, Maher, Barbara A, Moreton, Steven Grahame, Shimmield, Tracy M, Korte, Monika
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2010
• Subjects: Box corer; Vibro corer; CTD/Rosette; Gravity corer; Giant box corer; JR20060109; ANT-XXIII/4; James Clark Ross; Polarstern; International Polar Year 2007-2008 IPY; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Amundsen Sea; Antarc*; Antarctic; Antarctica; International Polar Year; IPY; West Antarctica
• Online Access: https://dx.doi.org/10.1594/pangaea.715974; https://doi.pangaea.de/10.1594/PANGAEA.715974

Reliable dating of glaciomarine sediments deposited on the Antarctic shelf since the Last Glacial Maximum (LGM) is very challenging because of the general absence of calcareous (micro-) fossils and the recycling of fossil organic matter. As a consequence, radiocarbon (14C) ages of the acid-insoluble organic fraction (AIO) of the sediments bear uncertainties that are very difficult to quantify. In this paper we present the results of three different chronostratigraphic methods to date a sedimentary unit consisting of diatomaceous ooze and diatomaceous mud that was deposited following the last deglaciation at five core sites on the inner shelf in the western Amundsen Sea (West Antarctica). In three cores conventional 14C dating of the AIO in bulk sediment samples yielded age reversals down-core, but at all sites the AIO 14C ages obtained from diatomaceous ooze within the diatom-rich unit yielded similar uncorrected 14C ages ranging from 13,517±56 to 11,543±47 years before present (yr BP). Correction of these ... : Data included in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...