(Appendix A) Geochemical composition of snow and eolian mineral dust from Berkner Island ice sheet, Antarctica ...

• Main Authors: Bory, Aloys J-M, Wolff, Eric William, Mulvaney, Robert, Jagoutz, Emil, Wegner, Anna, Ruth, Urs, Elderfield, Henry
• Format: Dataset
• Language: English
• Published: PANGAEA 2010
• Subjects: ipy; Sample ID; Sample type; Depth, top/min; Depth, bottom/max; DEPTH, ice/snow; Sample mass; Time coverage; δ18O, water; Sodium; Calcium; Neodymium; Dust concentration; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; ε-Neodymium 0; ε-Neodymium, standard deviation; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; Snow pit; Thermal Ionization Mass Spectrometry TIMS; Ion chromatography; International Polar Year 2007-2008 IPY; Antarc*; Antarctic; Antarctica; Berkner Island; Filchner Ronne Ice Shelf; Filchner-Ronne Ice Shelf; Ice Sheet; Ice Shelf; International Polar Year; IPY; Ronne Ice Shelf; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.786617; https://doi.pangaea.de/10.1594/PANGAEA.786617

The Sr and Nd isotopic composition of dust extracted from recent snow layers at the top of Berkner Island ice sheet (located within the Filchner-Ronne Ice Shelf at the southern end of the Weddell Sea) enables us, for the first time, to document dust provenance in Antarctica outside the East Antarctic Plateau (EAP) where all previous studies based on isotopic fingerprinting were carried out. Berkner dust displays an overall crust-like isotopic signature, characterized by more radiogenic 87Sr/86Sr and much less radiogenic 143Nd/144Nd compared to dust deposited on the EAP during glacial periods. Differences with EAP interglacial dust are not as marked but still significant, indicating that present-day Berkner dust provenance is distinct, at least to some extent, from that of the dust reaching the EAP. The fourteen snow-pit sub-seasonal samples that were obtained span a two-year period (2002-2003) and their dust Sr and Nd isotopic composition reveals that multiple sources are at play over a yearly time period. ... : 87Sr/86Sr error bars span the entire possible 87Sr/86Sr range taking into account a potential carbonate contribution varying from 0 to 100% (and associated errors), in addition to the analytical measurement 2 sigma error and errors on sea-salt derived Sr estimates. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...