Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment

Gehrke, B; Lackschewitz, Klas; Wallrabe-Adams, Hans-Joachim

doi:10.1007/s005310050093

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“…Moreover, the most significant inputs of eolian dusts in the North Atlantic are observed at much lower latitudes [ Moreno et al , 2002; Watkins and Maher , 2003]. The remaining possible transport vectors of the basaltic fraction are either the near‐bottom currents associated with the different branches of the North Atlantic Deep Water [ Fagel et al , 1996; Fagel and Hillaire‐Marcel , 1997; Gehrke et al , 1996; Revel et al , 1996; Moros et al , 1997; Rasmussen et al , 1998; Kissel et al , 1999a] or the vertical advection by iceberg melting [ Robinson et al , 1995; Stoner et al , 1996; Watkins and Maher , 2003].…”

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confidence: 99%

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

Ballini

Kissel

Colin

et al. 2006

Geochem Geophys Geosyst

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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.

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