Grain size effects on excess Thorium-230 of sediment cores from the Southern Ocean and the South East Atlantic, supplement to: Kretschmer, Sven; Geibert, Walter; Rutgers van der Loeff, Michiel M; Mollenhauer, Gesine (2010): Grain size effects on Th-230 (xs) inventories in opal-rich and carbonate-rich marine sediments. Earth and Planetary Science Letters, 294(1-2), 131-142


Excess Thorium-230 (230Thxs) as a constant flux tracer is an essential tool for paleoceanographic studies, but its limitations for flux normalization are still a matter of debate. In regions of rapid sediment accumulation, it has been an open question if 230Thxs-normalized fluxes are biased by particle sorting effects during sediment redistribution. In order to study the sorting effect of sediment transport on 230Thxs, we analyzed the specific activity of 230Thxs in different particle size classes of carbonate-rich sediments from the South East Atlantic, and of opal-rich sediments from the Atlantic sector of the Southern Ocean. At both sites, we compare the 230Thxs distribution in neighboring high vs. low accumulation settings. Two grain-size fractionation methods are explored.

Metadata Access
Creator Kretschmer, Sven;Rutgers van der Loeff, Michiel M;Mollenhauer, Gesine;Geibert, Walter
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2010
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Discipline Earth System Research
Spatial Coverage (53S-20S,4 E-9 E)
Temporal Point 1988-03-01T11:59:59Z