%0 Journal Article
%A Haberzettl, T.
%A Anselmetti, F.S.
%A Bowen, S.W.
%A Fey, M.
%A Mayr, C.
%A Zolitschka, B.
%A Ariztegui, D.
%A Mauz, B.
%A Ohlendorf, C.
%A Kastner, S.
%A Lücke, A.
%A Schäbitz, F.
%A Wille, M.
%T Late Pleistocene dust deposition in the Patagonian steppe; extending and refining the paleoenvironmental and  ephrochronological record from Laguna Potrok Aike back to 55 ka
%J Quaternary science reviews
%V 28
%@ 0277-3791
%C Amsterdam [u.a.]
%I Elsevier
%M PreJuSER-8983
%D 2009
%Z We thank Regine Rothlisberger for providing us with her non-sea-salt calcium data from Dome C. Sabine Stahl and Ellen Reid are acknowledged for assistance with geochemical and tephra analyses as well as Guillaume St-Onge for comments on parts of an earlier draft of this manuscript. Raimon Tolosana-Delgado, Hilmar von Eynatten, Hans Ruppert, Istvan Dunkl and Volker Karius provided fruitful discussions. We also acknowledge the helping hands of Philipp Bluszcz during core processing. Finally, we would like to thank Barbara Delmonte and an anonymous reviewer for their substantial comments which improved an earlier version of the manuscript distinctively. This is a contribution to the German Climate Research Program DEKLIM (grants 01 LD 0034 and 0035) of the German Federal Ministry of Education and Research (BMBF). Seismic surveys were funded by the German Research Foundation (DFG Zo102/5-1, 2, 3) in the framework of the priority program ICDP, Torsten Haberzettl is currently supported by a postdoctoral fellowship scholarship provided by Le Fonds quebecois de la recherche Sur la nature et les technologies (FQRNT). This constitutes GEOTOP contribution n degrees 2009-0017.
%X Paleoenvironmental records extending well into the last glacial period are scarce in the steppe regions of southern South America. Here, we present a continuous record for the past 55 ka from the maar lake Laguna Potrok Aike (51 degrees 58' S. 70 degrees 23' W, southern Patagonia, Argentina). Previous studies on a sedimentary core from a lake level terrace near the northern margin of the lake covered parts of Oxygen Isotope Stage (OIS) 3 (59-29 ka) whereas a second core from the centre of the basin comprised the last 16 ka. Tephrostratigraphical constraints and OSL ages from a third core located below the lake level terrace provide the crucial piece to close the gap between the previous coring sites. High-resolution XRF and magnetic susceptibility as well as grain size data indicate a positive hydrological balance alongside with relatively high aeolian activity during the glacial which is contemporaneous with increased dust fluxes in Antarctica. This is therefore the first evidence for contemporaneity of aeolian deposition in both the target area (Antarctica) and in the major source area of Patagonia. During the Holocene climatic conditions driving sediment deposition seem to have been more variable and less dominated by wind compared to glacial times. The identification of a minor lake level lowering at approximately 4 cal ka BP allows to refine earlier paleoenvironmental reconstructions for the Holocene. Within error margins the OSL ages are consistent with published radiocarbon-dated records offering hence a valuable tool for further studies of the sediments from Laguna Potrok Aike. The new chronology confirms the age of three tephra layers up to now only found in Laguna Potrok Aike sediments and ascribed to OIS 3. (C) 2009 Elsevier Ltd. All rights reserved.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000271872200027
%R 10.1016/j.quascirev.2009.07.021
%U https://juser.fz-juelich.de/record/8983