Lead isotopic compositions in the EPICA Dome C ice core and Southern Hemisphere Potential Source Areas

• Published in: Quaternary Science Reviews
• Main Authors: Vallelonga, P., Gabrielli, P., Balliana, E., Wegner, A., Delmonte, B., Turetta, C., Burton, G., Vanhaecke, F., Rosman, K.J.R., Hong, S., F. Boutron, Claude, Cescon, P., Barbante, C.
• Other Authors: Institute for the Dynamics of Environmental Processes-CNR, Department of Imaging and Applied Physics, Curtin University, Laboratoire de glaciologie et géophysique de l'environnement (LGGE), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), School of Earth Sciences and Byrd Polar Research Center, Ohio State University Columbus (OSU), Department of Analytical Chemistry, Universiteit Gent = Ghent University (UGENT), Department of Environmental Sciences, Università degli Studi di Milano-Bicocca = University of Milano-Bicocca (UNIMIB), Department of Bentho-pelagic processes, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI), Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Dipartimento di Scienze dell'Ambiente e del Territorio (DISAT), Università degli Studi di Milano = University of Milan (UNIMI), Korea Polar Research Institute (KOPRI), Université Joseph Fourier - Grenoble 1 (UJF), Australian Research Council (DP0345625) , the Antarctic Science Advisory Committee (#1092,2334),Institut Universitaire de France, the Ministere de l'Environnement et de l'Amenagemont du Territoire, the Agence de l'Environnement et de la Maıtrise de l'Energie, the Institut National des Sciences de l'Univers, the Consorzio per l'Attuazione del Programma Nazionale delle Ricerche in Antartide, FWO-Vlaanderen for the financial support under the form of the research projects G.0669.06 and G.0585.06, European Union Marie Curie IIF Fellowship (MIF1-CT-2006-039529, TDICOSO), ANSTO travel stipend to attend INQUA2007
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2010
• Subjects: [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology; Antarc*; Antarctic; Antarctica; East Antarctica; EPICA; ice core
• Online Access: https://insu.hal.science/insu-00420825; https://doi.org/10.1016/j.quascirev.2009.06.019

International audience A record of Pb isotopic compositions and Pb and Ba concentrations are presented for the EPICA Dome C ice core covering the past 220 ky, indicating the characteristics of dust and volcanic Pb deposition in central East Antarctica. Lead isotopic compositions are also reported in a suite of soil and loess samples from the Southern Hemisphere (Australia, Southern Africa, Southern South America, New Zealand, Antarctica) in order to evaluate the provenance of dust present in Antarctic ice. Lead isotopic compositions in Dome C ice support the contention that Southern South America was an important source of dust in Antarctica during the last two glacial maxima, and furthermore suggest occasional dust contributions from local Antarctic sources. The isotopic signature of Pb in Antarctic ice is altered by the presence of volcanic Pb, inhibiting the evaluation of glacial–interglacial changes in dust sources and the evaluation of Australia as a source of dust to Antarctica. Consequently, an accurate evaluation of the predominant source(s) of Antarctic dust can only be obtained from glacial maxima, when dust-Pb concentrations were greatest. These data confirm that volcanic Pb is present throughout Antarctica and is emitted in a physical phase that is free from Ba, while dust Pb is transported within a matrix containing Ba and other crustal elements.