Journal article

Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia

Agathe Lise-Pronovost, Guillaume St-Onge, Claudia Gogorza, Torsten Haberzettl, Guillaume Jouve, Pierre Francus, Christian Ohlendorf, Catalina Gebhardt, Bernd Zolitschka



The sedimentary archive from Laguna Potrok Aike is the only continuous record reaching back to the last Glacial period in continental southeastern Patagonia. Located in the path of the Southern Hemisphere westerly winds and in the source region of dust deposited in Antarctica during Glacial periods, southern Patagonia is a vantage point to reconstruct past changes in aeolian activity. Here we use high-resolution rock-magnetic and physical grain size data from site 2 of the International Continental scientific Drilling Program (ICDP) Potrok Aike maar lake Sediment Archive Drilling prOject (PASADO) in order to develop magnetic proxies of dust and wind intensity at 52°S since 51,200 cal BP. Roc..

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Awarded by International Continental scientific Drilling Program (ICDP)

Awarded by German Research Foundation (DFG)

Awarded by Swiss National Funds

Awarded by Natural Sciences and Engineering Research Council of Canada

Awarded by Swedish Research Council

Funding Acknowledgements

We acknowledge J. Labrie, F. Barletta, M.-P. St-Onge and D. Veres for their help in the laboratory at ISMER. We are grateful to two anonymous reviewers for constructive comments on the manuscript as well as A. Chauvin and J. Stoner for reading an earlier draft. Thanks to A. Mazaud and Q. Simon for fruitful discussions and to S. Bjorck, A. Hahn, P. Kliem, F. Lambert, L. Pichevin, D. Schimpf, M. Tonello, M. Weber and T. Whittaker for sharing their data. This research was supported by the International Continental scientific Drilling Program (ICDP expedition 5022). Funding for drilling was provided by the ICDP, the German Research Foundation (DFG DFG Zo 102/11-1, 2), the Swiss National Funds (SNF 200020-119931 and 200020-119931/2), the Natural Sciences and Engineering Research Council of Canada (NSERC 5796-352379-2007), the Swedish Research Council (VR 2006-5868) and the University of Bremen (PASADO-University of Bremen-2). For their invaluable help in field logistics and drilling, we thank the staff of INTA Santa Cruz and Rio Dulce Catering as well as the Moreteau family and the DOSECC crew. This research was made possible through a NSERC Special Research Opportunity and Discovery grants to G. St-Onge and P. Francus. We also acknowledge the Canadian Foundation for Innovation (CFI 10738) for the acquisition and operation of the u-channel cryogenic magnetometer. Finally, we acknowledge the support of NSERC and the Canadian Meteorological and Oceanographical Society (CMOS) for graduate scholarships to A. Lise-Pronovost, and the Fonds de recherche du Quebec - Nature et technologies (FQRNT) for a postdoctoral fellowship to T. Haberzettl.