Trace elements and Pb isotope records in Dome C (East Antarctica) ice over the past 800,000 years
1 Department of Ocean Sciences, Inha University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, KOREA
2 Korea Polar Research Institute, Songdo Techno Park, 7-50, Songdo-dong, Yeonsu-gu, Incheon 406-840, KOREA
3 Department of Imaging and Applied Physics, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, AUSTRALIA
4 School of Earth Sciences and Byrd Polar Research Center, The Ohio State University, 108 Scott Hall, 1090 Carmack Road, Columbus, OH 43210, USA
5 Department of Environmental Sciences, University of Venice, Ca’ Foscari, 30123 Venice, ITALY
6 Laboratoire de Glaciologie et Géophysique de l’Environnement, UMR CNRS 5183, B.P. 96, 38402, Saint Martin d’Hères Cedex, FRANCE
Trace elements (V, Cr, Mn, Fe, Co, Cu, Zn, As, Rb, Sr, Mo, Cd, Sb, Ba, Tl, Pb, Bi, Th and U) and Pb isotopic compositions from the EPICA (European Project for Ice Coring in Antarctica) Dome C ice core have been determined using inductively coupled plasma sector field mass spectrometry (ICP-SFMS) and thermal ionization mass spectrometry (TIMS), covering the period from ~533 kyr BP to ~800 kyr BP, respectively. Our data have enabled us to extend the previous EDC records of trace elements and Pb isotopes from the Holocene back to the Marine Isotopic Stage 20.2, ~800 kyr BP. We here discuss the EDC records of Ba, Rb, Mo, Sb, Cd, Tl, Bi and Pb isotopes. Crustal elements such as Ba and Rb show well defined variations in concentrations in relation to climatic conditions with lower values during the interglacial periods and much higher values during the coldest periods of the last eight climatic cycles. Volcanogenic Cd, Tl and Bi show a less pronounced relationship between concentrations and climatic conditions. The isotopic signatures of Pb suggest that changes in the provenance of dust reaching the East Antarctic Plateau from Potential Source Areas occurred during the interglacial periods before the MBE. Our data suggest that the main factors affecting deposition fluxes and sources of natural trace elements over Antarctica are most likely linked to a progressive coupling of the climates of Antarctica and lower latitudes over the past 800 kyr.
Key words: Trace elements / Pb isotopes / Antarctic ice / Climate change / Mid-Brunhes Event
© Owned by the authors, published by EDP Sciences, 2013
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