Climate-driven changes in lake conditions during late MIS 3 and MIS 2: a high-resolution geochemical record from Les Echets, France |
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| Authors: | DANIEL VERES ELISABETH LALLIER-VERGÈS BARBARA WOHLFARTH TERRI LACOURSE DIDIER KÉRAVIS SVANTE BJÖRCK FRANK PREUSSER VALéRIE ANDRIEU-PONEL LINDA AMPEL |
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| Institution: | 'Emil Racovita' Speleological Institute, Clinicilor 5, 400006 Cluj, Romania,;Department of Physical Geography and Quaternary Geology, Stockholm University, SE-10691 Stockholm, Sweden,;Institut des Sciences de la Terre d'Orléans, UMR 6113 CNRS Universitéd'Orléans, 1A rue de la Férollerie, 45071 Orléans Cedex, France,;Department of Geology and Geochemistry, Stockholm University, SE-10691 Stockholm, Sweden,;University of Victoria, Department of Geography, Victoria, BC, V8W 3R4 Canada,;Lund University, Department of Geology, GeoBiosphere Science Centre, SE- 22362 Lund, Sweden,;Institut für Geologie, Universität Bern, Baltzerstrasse 1+3, 3012 Bern, Switzerland,;Institut Méditerranéen d'Ecologie et de Paléoécologie (IMEP, UMR 6116 CNRS), Europôle Méditerranéen de l'Arbois, BP 80, F-13545 Aix-en-Provence Cedex, France |
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| Abstract: | A new set of geochemical data obtained from a long sediment sequence from the Les Echets basin provides a new record of palaeoenvironmental change for western Europe. The sequence covers the late part of Marine Isotope Stage (MIS) 3 and MIS 2 ( c . 46.1–15.0 cal. kyr BP) and extends over 30 m of sediment, allowing for high sampling resolution. Distinct cyclic fluctuations in aquatic productivity proxies suggest a tempo of environmental change at Les Echets that resembles the one established for Dansgaard-Oeschger cycles and Heinrich events. Increases in organic carbon are paralleled by high hydrogenous contents and enriched δ13Corg and Corg/Ntot ratios, implying a mixture of aquatic and land-derived constituents. The stable isotope values are directly linked to primary aquatic productivity and the input of terrestrial organic matter, enriched during warm, productive, periods, and drastically depleted during cold periods, particularly Heinrich events. Phases of relatively high productivity correlate with Dansgaard-Oeschger interstadials 8–2, while Heinrich events 3 and 2 are also clearly delineated by distinct lithological horizons with very low organic contents, high dry densities and enhanced organic matter oxidation. A large hiatus occurring about the time of Heinrich event 4 suggests that the cold and dry climate reconstructed for this event in the North Atlantic region also greatly affected Les Echets and its catchment. |
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