Ice rafted debris flux and composition of sediment core PS93/025

• Main Author: Zehnich, Marc
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: AGE; Arctic; ARK-XXIX/2.1; Clastic sedimentary rocks; Crystalline rocks; Quartz and Feldspar; DEPTH; sediment/rock; Event label; Fram Strait; Giant box corer; GKG; Greenland; Ice rafted debris; flux; rounded; IRD; KAL; Kasten corer; Limestones and Dolomites; North Greenland Sea; Polarstern; PS93/025-1; PS93/025-2; PS93.1; Volcanic rocks and mafic minerals; Greenland Sea; North Greenland; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.923852; https://doi.org/10.1594/PANGAEA.923852

IRD flux and the corresponding petrographic grain composition. The sampled sediment record PS93/025, consisting of the Giant box core (GKG) PS93/025-1 (80.481°N, 8.487°W, 291.3 m water depth) and the Kastenlot core (KAL) PS93/025-2 (80.482°N, 8.490°W, 290.2 m water depth), was obtained during the expedition PS93.1 (2015) (Stein, 2016) of RV Polarstern on the outermost NE Greenland shelf in the western Fram Strait. The presented data covers the last ca. 10.6 ka. Ice-rafted debris counts were performed on the >150 μm fraction at steps of 5 cm. The results are expressed as flux rates (grains/cm2*ka). Additionally, the corresponding petrographic grain composition was analyzed to determine the source area(s) of these lithic particles by using the following groups: (a) clastic sedimentary rocks (e.g. siltstones); (b) metamorphic rocks (e.g. quartzites), volcanic rocks (e.g. basalt), olivine grains, volcanic glass shards, mica; (c) crystalline rocks, quartz and feldspar; (d) limestones and dolomites. Rounded grains were specified following St John et al. (2015) to identify the influence of sea-ice sediments. In this study, grains with subrounded and rounded shape were counted and grouped as "rounded." Aim of the study was to reconstruct the climatic and paleoceanographic variability offshore Northeast Greenland during the last ca. 10ka with multidecadal resolution.