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  • Data  (3)
  • Dredge; DRG; Marara; NIXO10; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; NX10-CL; Pacific Ocean; TECHNO 07  (2)
  • 11-100; Aluminium; Aluminium oxide; Calcium; Calcium oxide; Chromium; Chromium(III) oxide; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Glomar Challenger; Iron 2+ and 3+; Iron oxide, FeO; Leg11; Magnesium; Magnesium oxide; Manganese; Manganese oxide; Minerals; North Atlantic/BASIN; Number of oxygens; Potassium; Potassium oxide; Sample code/label; Sample comment; Silicon; Silicon dioxide; Sodium; Sodium oxide; Titanium; Titanium dioxide
  • 37-332A; 37-332B; 45-395A; 46-396B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg37; Leg45; Leg46; North Atlantic/VALLEY
  • 1975-1979  (3)
  • 1979  (3)
Collection
  • Data  (3)
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Keywords
Publisher
Years
  • 1975-1979  (3)
Year
  • 1
    facet.materialart.
    Unknown
    TECHNO encrustation description and analysis (1979)
    PANGAEA
    In:  Supplement to: Lalou, Claude; Ku, Teh-Lung; Brichet, Evelyne; Poupeau, G; Romary, P (1979): TECHNO encrustation, Part I: Radiometric studies. In: Lalou C. & Sorensen, B.M. (Eds), La Genèse Des Nodules de Manganèse. Centre Océanologique de Bretagne, Gif-sur-Yvette, France, 261-269, hdl:10013/epic.46220.d031
    Details
    Publication Date: 2023-08-28
    Description: The distribution of radioactivities in a large polymetallic encrustation (TECHNO) sampled from the Pacific sea floor has been studied in great detail. The study includes measurements of the long-lived U and Th decay series isotopes, alpha-particle tracks and SUP-10 Be and SUP-26 Al (Results on the latter two cosmonuclides have been reported by Guichard, Reyss and Yokoyama, 1978). The data are discussed in terms of their implication on age dating of the sample. Two interpretations of the data are presented leading to vastly different time scales for the formation of the sample. Here the opinion is divided among the authorship. One group, as well as Guichard et al (1978), favours the million-years scale and the other favors scale measured in thousands of years. The principal pros-and-cons aspects of the two views are mentioned.
    Keywords: Dredge; DRG; Marara; NIXO10; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; NX10-CL; Pacific Ocean; TECHNO 07
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Structure and chemistry of TECHNO encrustations (1979)
    PANGAEA
    In:  Supplement to: Lalou, Claude; Brichet, Evelyne; Jehanno, Celestine (1979): TECHNO encrustation, Part II: Structural and Chemical study. In: Lalou C. & Sorensen, B.M. (Eds), La Genèse des Nodules de Manganèse. Centre Océanologique de Bretagne, Gif-sur-Yvette, France, 271-280, hdl:10013/epic.46220.d032
    Details
    Publication Date: 2023-08-28
    Description: Using as a starting point the results giving 'traditional' growth rates as determined by the decrease of radioelements (part I) and the hypothesis of rapid formation, the different mineralogical, structure and chemical characteristics of the sample have been studied to try to understand the possible mode of formation of this encrustation. A rapid formation would account for (1) the very peculiar structure of the sample composed of oriented botryoids and the bundle-like structure of the outermost oxide layer; (2) the fact that this sample represents a substitution of a preexisting hyaloclastite; (3) the different chemical gradients, mainly iron, thorium and uranium; (4) the fact that this sample which cannot have been maintained at the sediment-water interface by bioturbation is not covered by a great thickness of sediments. On the other hand, an unsolved problem remains: Why different radionuclides used for dating give growth rates of the same order of magnitude and different 'exposition ages'.
    Keywords: Dredge; DRG; Marara; NIXO10; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; NX10-CL; Pacific Ocean; TECHNO 07
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 3
    facet.materialart.
    Unknown
    Chemical composition of ocean-floor basalts and separated magnetites DSDP Legs 37, 45 and 46 (1979)
    PANGAEA
    In:  Supplement to: Schock, Hans Hartmut (1979): Distribution of rare-earth and other trace elements in magnetites. Chemical Geology, 26(1-2), 119-133, https://doi.org/10.1016/0009-2541(79)90034-2
    Details
    Publication Date: 2024-05-15
    Description: Titanomagnetites separated from 15 different rock samples (including ocean-floor basalts from DSDP Legs 37, 45 and 46) were analyzed together with whole-rock samples by instrumental neutron-activation analysis for Sc, Cr, Co, Zn, Hf, Ta, Th and the REE La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Tm, Yb and Lu. In titanomagnetities from ocean-floor basalts and some other rocks, REE are enriched with respect to the whole-rock composition by factors of between 1.5 and 3 for light REE and between 1.0 and 1.9 for heavy REE; that is, REE with larger ionic radii are preferentially incorporated into the magnetite lattice. Three magnetite samples are REE depleted. Their whole-rock samples contain P in appreciable amounts, so apatite, an important REE-accumulating mineral, could have captured REE to some extent. All titanomagnetites show a marked negative Eu anomaly, this is most probably caused by discrimination of Eu(2+) from the magnetite lattice. Co, Zn, Hf and Ta are significantly enriched in magnetites. The distribution behaviour of Sc and Cr is masked chiefly by the crystallization of clinopyroxene and therefore is not easy to estimate. Ulvöspinel contents of about 70% for the titanomagnetites from ocean-floor basalts were estimated from qualitative microprobe analysis. Ulvöspinel contents of all other samples varied in a wide range from 20% to about 90%. No correlation could be observed between this and the REE contents of the magnetites. Ilmenite exsolution lamellae could only be observed in titanomagnetites from a doleritic basalt from Leg 45.
    Keywords: 37-332A; 37-332B; 45-395A; 46-396B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg37; Leg45; Leg46; North Atlantic/VALLEY
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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