Lalou, Claude; Brichet, Evelyne; Jehanno, Celestine (1979): Structure and chemistry of TECHNO encrustations [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.855089, Supplement to: Lalou, C et al. (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
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Abstract:
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'.
Source:
Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V52Z13FT
Further details:
Fig. 6. - Details of figure 5 : A) Botryoids of the upper part of layer E showing the concentric sublayers; B) Botryoids of the lower part of layer E, showing the tiny craters; C) Lower part of botryoids (right upper part of Figure 5). The bars are 10 microns in the three photos
Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V53X84KN
Project(s):
Coverage:
Latitude: -13.090000 * Longitude: -148.620000
Date/Time Start: 1973-11-03T00:00:00 * Date/Time End: 1973-11-03T00:00:00
Event(s):
NX10-CL * Latitude: -13.090000 * Longitude: -148.620000 * Date/Time: 1973-11-03T00:00:00 * Elevation: -4020.0 m * Location: Pacific Ocean * Campaign: NIXO10 (TECHNO 07) * Basis: Marara * Method/Device: Dredge (DRG)
Comment:
From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database.
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Lalou, C; Brichet, E; Jehanno, C (1979): (Table 1, page 275), EDAX major elements analysis of botryoids from different layers of the TECHNO crust. https://doi.org/10.1594/PANGAEA.855056
- Lalou, C; Brichet, E; Jehanno, C (1979): (Table 2, page 277), Major and trace elements geochemical analysis of the layers of the TECHNO crust. https://doi.org/10.1594/PANGAEA.855088