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  • Dredge, box; DRG_B; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Peru Basin; SEDIPERU - TUSCH; SO79; SO79_62KD; Sonne  (1)
  • Lake Constance  (1)
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Keywords
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  • 1
    Electronic Resource
    Electronic Resource
    High resolution time series of lead and zinc in sediments of Lake Constance (1995)
    Springer
    Aquatic sciences 57 (1995), S. 291-304 
    Details
    ISSN: 1420-9055
    Keywords: Lake Constance ; lake sediments ; dating methods ; heavy metal chronology ; lead ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sediments in Lake Constance have been dated by radiometric methods and lamination counting. Investigations into the concentrations of lead and zinc in the sediments were carried out to get detailed information about environmental history. Maximum concentrations were found at the beginning of the 1960's. The lead maximum contamination occurred 3 years before the zinc maximum and has an unidentified source. The use of coal, leaded gasoline or the remobilization within the sediment could be excluded to result in the lead maximum. The fluctuations in zinc contamination could be explained with increasing and decreasing pollution (industry, coal burning, building of sewage plants). The greatest fluctuations of both metals occur during periods of great change in the economic history of Germany.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878394
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    Description of, and 238U, 234U, 232Th and 230Th measurements on a nodule from R/V Sonne station SO79_62KD, Central East Pacific Ocean (1999)
    PANGAEA
    In:  Supplement to: Bollhöfer, A; Frank, Norbert; Rohloff, S; Mangini, Augusto; Scholten, Jan Christoph (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
    Details
    Publication Date: 2023-08-28
    Description: 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.
    Keywords: Dredge, box; DRG_B; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Peru Basin; SEDIPERU - TUSCH; SO79; SO79_62KD; Sonne
    Type: Dataset
    Format: application/zip, 3 datasets
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