Publication Date:
2023-06-27
Description:
A new chemical procedure for cleaning marine carbonates was applied to remove detritus as well as metaloxide contaminations of marine shells from Eemian deposits and adjoining succession of a sediment core from Dagebüll, Schleswig- Holstein. Hence, one can significantly reduce the contamination with detrital uranium and thorium. Thermal ionisation mass spectrometry was applied to determine the uranium and thorium activities used for 230Th/U dating of these shells. At least ten samples of marine bivalves of five different core sections were analysed. Samples located below a five meter thick clay layer at 19-24 m yielded an average age of 132±18 ka. Shells located above the clays at 15-20 m depth were strongly influenced by percolating groundwaters of an open system. Therefore, a reliable dating of these samples was not possible.
Keywords:
Age, 230Th/U Thorium-Uranium; Age, dated; Age, dated standard deviation; DA-1; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; Error, absolute; Error, relative; GIK14350-1; GIK-cruise; Hauke-Haien-Koog, Dagebüll, Schleswig-Holstein, Germany; Laboratory number; Sample ID; Sample mass; Thermal Ionization Mass Spectrometry (TIMS); Thorium-229/Thorium-230 ratio; Thorium-229/Thorium-232 ratio; Thorium-230; Thorium-230, standard deviation; Thorium-230/Thorium-232 ratio; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, error, relative; Thorium-232; Thorium-232, standard deviation; Uranium-234/Uranium-236 ratio; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, error, absolute; Uranium-235/Uranium-236 ratio; Uranium-238; Uranium-238/Uranium-236 ratio
Type:
Dataset
Format:
text/tab-separated-values, 390 data points
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