Magnetic properties and sortable silt data from marine sedimentsfrom the Gardar drift and the Charlie-Gibbs fracture zone as tracers for bottom current dynamic, supplement to: Kissel, Catherine; Van Toer, Aurélie; Laj, Carlo E; Cortijo, Elsa; Michel, Elisabeth (2013): Variations in the strength of the North Atlantic bottom water during Holocene. Earth and Planetary Science Letters, 369-370, 248-259

• Main Author: Kissel, Catherine
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2019
• Subjects: Holocene; intensity bottom currents; magnetism; sortable silt; Climate Change Learning from the past climate Past4Future; Iceland; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.899300; https://doi.pangaea.de/10.1594/PANGAEA.899300

Magnetic properties coupled with sortable silt are investigated for Holocene marine sedimentary sequences located in the subpolar North Altantic, in the Charlie– Gibbs fracture zone (53°N) and in central (57°N) and southern Gardar drift (59°N). All the cores are located at water depths bathed by the Iceland–Scotland Overflow Water, mixed at the southernmost locality with southern sourced water masses. The goal of the multi-proxy study is the changes in the dynamics and the properties of bottom water mass during Holocene. After checking that the magnetic minerals is magnetite of uniform grain size, the low field magnetic susceptibility is used as a magnetic concentration parameter and as a tracer of the transport efficiency by the bottom current from the northern basaltic-derived source. The mean sortable silt size is used as a tracer of bottom current strength whatever the detrital source.