HIGH-RESOLUTION URANIUM-SERIES DATING OF NORWEGIAN GREENLAND SEA SEDIMENTS - TH-230 VS DELTA-O-18 STRATIGRAPHY

The ages and average sedimentation rates of four long sediment cores f rom the Norwegian-Greenland Sea were determined by using various Th-23 0 dating models. The results were then related to an independent time control (delta(18)O stratigraphy) which was available for the cores un der consideration. Average sedimentation rates were calculated from Th -230(ex) vs. depth profiles. These rates are similar to rates obtained by the delta 18O stratigraphy if the cores cover the past 300,000 yea rs. A high time resolution is achieved by a Th-230 constant-flux model for those sediment cores which are not influenced by lateral sediment transport. A powerful tool for chronostratigraphic studies of sedimen t cores appears to be the combination of Th-230 measurements and delta 18O stratigraphy, which allows the determination of individual sedime ntation rates for each core layer.