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Bulletin de la Societe Geologique de France; January 2007; v. 178; no. 1; p. 3-13; DOI: 10.2113/gssgfbull.178.1.3
© 2007 Societe Geologique de France
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Signatures of rapid climatic changes in organic matter records in the western Mediterranean Sea during the last glacial period

François Baudin1, Nathalie Combourieu-Nebout2 and Rainer Zahn3

1 Université Pierre et Marie Curie-Paris 6, Département de Géologie Sédimentaire et CNRS UMR 5143-FR 32, case 117, 4 place Jussieu 75252 Paris cedex 05, France (frbaudin{at}ccr.jussieu.fr)
2 Laboratoire des Sciences du Climat et de l’Environnement, CNRS/CEA UMR 1572, Domaine du CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette cedex, France
3 ICREA, Universitat de Barcelona, Campus de Pedralbes, Carrer Marti i Frances, 08028 Barcelona, Spain

Records of calcium carbonate, organic matter (organic carbon content, palynology) and planktonic foraminiferal oxygen isotopes from ODP Site 976, Alboran Sea, are used to reconstruct the evolution of continental climates and oceanic productivity in the westernmost Mediterranean over the past 50,000 years. The records mimic the Greenland ice core records in that they display the Heinrich events and the rapid Dansgaard/Oeschger-type stadial-interstadial oscillations. Warm interstadials correlate with an expansion of deciduous forests on the adjacent continents and enhanced river runoff and organic matter flux from terrestrial sources. In contrast, cold stadials are characterized by an expansion of semi-desert vegetation, reduced river runoff and limited terrestrial organic matter flux. The organic carbon record displays a longer-term cyclicity that correlates with the North Atlantic ’Bond’ cooling cycles. The records enable the documentation of rapid changes of continental climates in the western Mediterranean borderlands that caused changes in river runoff and in oceanic productivity that were driven by rapid fluctuations of the Atlantic inflow into the Mediterranean Sea. The combined terrestrial-marine patterns demonstrate the close linking of western Mediterranean climate with the climatic evolution in the North Atlantic region.

Key Words: Organic matter • Climatic changes • Quaternary • Alboran Sea • ODP Site 976






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