Description of, and 238U, 234U, 232Th and 230Th measurements on a nodule from R/V Sonne station SO79_62KD, Central East Pacific Ocean

doi:doi:10.1594/PANGAEA.855889

Description of, and 238U, 234U, 232Th and 230Th measurements on a nodule from R/V Sonne station SO79_62KD, Central East Pacific Ocean

Two diagenetic manganese nodules from the Peru Basin were investigated by thermal ionization mass spectrometry and high resolution alpha spectrometry for uranium and thorium. The TIMS concentrations for nodule 62KD (63KG) vary as follows: 0.12-1.01 ppb (0.06-0.59) 230Th, 0.51-1.98 ppm (0.43-1.40) 232Th, 0.13-0.80 ppb (0.09-0.49) 234U, and 1.95-13.47 ppm (1.66-8.24) 238U. Both nodules have average growth rates of ~110 mm per million years. However, from the variations of excess 230Th with depth we estimate partial accumulation rates which range from 50 to 400 mm per million years. The 234U dating method cannot be applied due to remobilization of U from the sediment and subsequent incorporation into the nodules' crystal lattice, reflected by decay corrected 234U values far above the ocean water value. Sections of fast nodule growth are related to those layers having high Mn/Fe ratios (up to 200) and higher densities. As a possible explanation we develop a scenario that describes similar glacial/interglacial trends in both nodules as a record of regional changes of sediment and/or deep water chemistry.

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Cite this as

Bollhöfer, A, Frank, Norbert, Rohloff, S, Mangini, Augusto, Scholten, Jan Christoph (1999). Dataset: Description of, and 238U, 234U, 232Th and 230Th measurements on a nodule from R/V Sonne station SO79_62KD, Central East Pacific Ocean. https://doi.org/10.1594/PANGAEA.855889

DOI retrieved: 1999

Additional Info

Field	Value
Imported on	November 29, 2024
Last update	November 29, 2024
License	CC-BY-3.0
Source	https://doi.org/10.1594/PANGAEA.855889
Author	Bollhöfer, A
Given Name	A
Family Name	Bollhöfer
More Authors	Frank, Norbert Rohloff, S Mangini, Augusto Scholten, Jan Christoph
Source Creation	1999
Publication Year	1999
Resource Type	application/zip - filename: Bollhoefer_1999
Subject Areas	Name: Geophysics
Related Identifiers	Title: A record of changing redox conditions in the northern Peru Basin during the Late Quaternary deduced from Mn/Fe and growth rate variations in two diagenetic manganese nodules Identifier: https://doi.org/10.1016/S0012-821X(99)00126-0 Type: DOI Relation: IsSupplementTo Year: 1999 Source: Earth and Planetary Science Letters Authors: Bollhöfer A , Frank Norbert , Rohloff S , Mangini Augusto , Scholten Jan Christoph . Title: The NOAA and MMS Marine Minerals Geochemical Database Identifier: https://doi.org/10.7289/V52Z13FT Type: DOI Relation: References Year: 1992 Source: National Geophysical Data Center, NOAA Authors: Grant John Bruce , Moore Carla J , Alameddin George , Chen Kuiying , Barton Mark , Warnken Robin R , Virden William T , Moore Carla J . Title: The NOAA and MMS Marine Minerals Bibliography Identifier: https://doi.org/10.7289/V53X84KN Type: DOI Relation: References Year: 1992 Source: National Geophysical Data Center, NOAA Authors: Grant John Bruce , Moore Carla J , Alameddin George , Chen Kuiying , Barton Mark , Warnken Robin R , Virden William T , Moore Carla J .