Abstract
Anisotropy of magnetic susceptibility (AMS) has been used extensively for determining mineral orientatrections. In terms of the sample coordinate, Kmax declinations in the three gravity cores are oriented along the core-splitting surface, whereas Kmax declinations in the three piston cores are perpendicular to the splitting surface. We attribute the artificial AMS to the stress created by the deformation of core liners when being split. When interpreting AMS data from sediment cores, it is necessary to investigate the influence of sampling using the sample coordinates. In this paper, we also report over-sampling and under-sampling of piston cores from a comparison of down-core magnetic susceptibility variations between piston and gravity cores. It is noteworthy that under-sampling as well as over-sampling can occur in the uppermost few meters of piston cores.
Highlights
Anisotropy of magnetic susceptibility (AMS) has been used extensively for determining mineral orientation fabrics
We report for the first time that artificial AMS caused by deformation of sediments is dependent on sampling methods
13% under-sampling occurred between 0.2 and 2.8 m of the piston core MR0604PC7 compared with the gravity core YK0712-GC1 between 1.0 and 4.0 m
Summary
Anisotropy of magnetic susceptibility (AMS) has been used extensively for determining mineral orientation fabrics. Copons et al (1997) reported laboratory-induced magnetic fabric in lake sediment cores taken with a piston corer. We compare magnetic susceptibility and its anisotropy between gravity and piston cores taken at the same sites.
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