Bollhöfer, A; Frank, Norbert; Rohloff, S; Mangini, Augusto; Scholten, Jan Christoph (1999): Description of, and 238U, 234U, 232Th and 230Th measurements on a nodule from R/V Sonne station SO79_62KD, Central East Pacific Ocean. PANGAEA, https://doi.org/10.1594/PANGAEA.855889, Supplement to: Bollhöfer, A et al. (1999): 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. Earth and Planetary Science Letters, 170(4), 403-415, https://doi.org/10.1016/S0012-821X(99)00126-0
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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.
Source data set:
Latitude: -6.718300 * Longitude: -90.568300
Date/Time Start: 1992-05-06T00:00:00 * Date/Time End: 1992-05-06T00:00:00
Datasets listed in this publication series
- Bollhöfer, A; Frank, N; Rohloff, S et al. (1999): (Table 1, Page 407) Results of the 238U, 234U, 232Th and 230Th measurements on a nodule from station 62KD from SO79 cruise of R/V Sonne in the Central East Pacific Ocean. https://doi.org/10.1594/PANGAEA.855887
- Bollhöfer, A; Frank, N; Rohloff, S et al. (1999): (Table 2, Page 408-409) Results of a 230Th, 234U, Mn and Fe chemical profile analysis on a nodule from station 62KD from SO79 cruise of R/V Sonne in the Central East Pacific Ocean. https://doi.org/10.1594/PANGAEA.855888
- Bollhöfer, A; Frank, N; Rohloff, S et al. (1999): Description of a manganese nodule analysed from station 62KD from SO79 cruise of R/V Sonne in the Central East Pacific Ocean. https://doi.org/10.1594/PANGAEA.855886