Grain-size distribution and grain-size dependent magnetic susceptibility of sediment core GeoB18530-1

• Main Authors: Bukar, Shettima, von Dobeneck, Tilo
• Format: Dataset
• Language: English
• Published: PANGAEA
• Subjects: 509-1; ArcTrain; Calculated; DEPTH; sediment/rock; bottom/maximum; top/minimum; GC; GeoB18530-1; Geochemistry; Grain size; maximum; minimum; grain size distribution; Grand Banks Margin; Gravity corer; Heinrich event; Heinrich events; Ice-Rafted Detritus; Kappabridge; AGICO KLY-2; Magnetic susceptibility; Maria S. Merian; MSM39; Precision scale; Sartorius; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; rock magnetism; SE Grand Banks Slope; Size fraction; Wet sieve shaker; Climate change; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.971771

Since the weight percentages of (classifiable) IRD particles > 1 mm and (unclassifiable, but separable) IRD particles > 125 µm both largely underestimate the total content and magnetic impact of IRD, it is important to quantify also the finer IRD fractions and their magnetic susceptibilities. From each of the IRD-rich sediment units H1, I1 and H2, six magnetic cube samples of 6.2 cm³ each were combined, dried, weighed and ultrasonically suspended in water. These three slurries were successively washed through 16 stacked sieves with mesh sizes in approximately 0.5 phi steps from 4000 µm to 5 µm using a Fritsch wet sieve shaker. The sieve fractions were carefully collected, dried, weighed and measured in a Kappabridge KLY2 susceptometer. The data and therefrom-derived partial susceptibilities and cumulative distributions clearly demonstrate that the magnetically most dominant and "volatile" sediment particles fall into the 40-125 µm range. Detrital particles of such sizes are too coarse to have been current-transported over long distances and were therefore probably at least partially ice-rafted.