(Table 1) Th and U concentrations and activity ratios in deep-sea sediments at ODP Hole 105-646B ...

The Labrador Sea is a particularly suitable high-latitude basin for investigating U and Th behavior in deep-sea sediments. During the late Quaternary, the cyclic development and decay of huge ice sheets on adjacent land masses resulted in large-amplitude changes in sedimentation rates and organic pa...

Full description

Bibliographic Details
Main Authors: Hillaire-Marcel, Claude, Aksu, Ali E, Causse, Christiane, de Vernal, Anne, Ghaleb, Bassam
Format: Dataset
Language:English
Published: PANGAEA 1990
Subjects:
AGE
Sample code/label
Sample, optional label/labor no
Thorium-232
Thorium-232, standard deviation
Uranium-238
Uranium-238, standard deviation
Uranium-234/Uranium-238 activity ratio
Uranium-234/Uranium-238 activity ratio, standard deviation
Uranium-238/Thorium-232 ratio
Uranium-238/Thorium-232 ratio error
Thorium-230/Thorium-232 ratio
Thorium-230/Thorium-232 ratio error
Thorium-230/Uranium-234 activity ratio
Thorium-230/Uranium-234 activity ratio, standard deviation
Age, error
Thorium-230
Drilling/drill rig
DSDP/ODP/IODP sample designation
Alpha spectrometry
Calculated
Leg105
Joides Resolution
Ocean Drilling Program ODP
Greenland
Labrador Sea
Online Access:https://dx.doi.org/10.1594/pangaea.711768
https://doi.pangaea.de/10.1594/PANGAEA.711768
Description
Summary:The Labrador Sea is a particularly suitable high-latitude basin for investigating U and Th behavior in deep-sea sediments. During the late Quaternary, the cyclic development and decay of huge ice sheets on adjacent land masses resulted in large-amplitude changes in sedimentation rates and organic paleoproductivities. The resulting magnification of U and Th response is well illustrated by high-resolution studies on piston-cored sediments from the Greenland continental rise at Ocean Drilling Program Leg 105 Site 646 spanning isotopic stages 8 to 1. Our results show a clear positive correlation of 238U/232Th ratios with organic paleoproductivity indicators (e.g., dinocyst) due to U uptake in the water column and/or during the early early diagenesis of organic matter responding to carbon fluxes and to their climate forcing. 230Th excesses over 234U exceed the theoretical value of the 230Th rain from the overlying water column, indicating lateral input possibly from the Greenland slope and shelf. Because these ... : Age data have been obtained by interpolation between 18O stage boundaries. ...

Similar Items