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GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,
VOL. 7,
Q02N01,
16 PP., 2006
doi:10.1029/2005GC001070 [Citation]
Deep-water mass source and dynamic associated with rapid climatic variations during the last glacial stage in the North Atlantic: A multiproxy investigation of the detrital fraction of deep-sea sediments
Laboratoire des Sciences du Climat et de l'Environnement, Unité Mixte CEA/CNRS, Avenue de la Terrasse, Gif-sur-Yvette Cedex, F-91198 France
Laboratoire des Sciences du Climat et de l'Environnement, Unité Mixte CEA/CNRS, Avenue de la Terrasse, Gif-sur-Yvette Cedex, F-91198 France
Laboratoire Interactions et Dynamique des Environnements de Surface, Université de Paris XI, Orsay Cedex, F-91405 France
Royal Netherlands Institute for Sea Research, Den Burg, P.O. Box 59, 1790 AB Netherlands
In order to investigate North Atlantic Deep Water (NADW) dynamics and variability during the last glacial stage, a very high resolution multiproxy analysis of the detrital fraction of sediments deposited during Heinrich event 4 and Dansgaard-Oeschger cycles 8 and 7 has been conducted on three deep-sea cores. These cores are distributed along the path of the North Atlantic Deep Water from the Faeroe Shetland Channel to the Reykjanes ridge and the Irminger basin. The concentration in fine-grained magnetites, the Ti-content, and the smectite percentage within the clay minerals show similar and coeval fluctuations at each site and are comparable from one site to the other. This is the imprint of the detrital fraction originating from the northern basaltic provinces and transported to the studied sites. The average grain size in the fine fraction indicates a transport by deep-sea currents. Therefore the observed fluctuations illustrate changes in the vigor of the bottom currents associated with the NADW with weak currents during cold periods (Heinrich 4 and stadials) and reactivation of the bottom circulation during interstadials.
Received 13 July 2005; accepted 22 November 2005; published 28 February 2006.
Citation: (2006), Deep-water mass source and dynamic associated with rapid climatic variations during the last glacial stage in the North Atlantic: A multiproxy investigation of the detrital fraction of deep-sea sediments, Geochem. Geophys. Geosyst., 7, Q02N01, doi:10.1029/2005GC001070.
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