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  • 1
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    Unknown
    Main chemical elements concentration in manganese nodules retrieved in the northeast equatorial Pacific during the R/V Valdivia VA-13/2 campaign (2022)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: Manganese nodule deposits exhibit variabity in distribution, deposit density, nodule morphology, and chemistry on scales of meters to thousands of kilometers. The Challenger Expedition recognized sufficient variation in nodule form to permit identification of a station location by inspection of a specimen nodule. The existence of a copper/nickel-rich nodule belt north of the equator in the Pacific was recognized in the 1950s and its character emphasized by early work of the IDOE Manganese Nodule Project. Through field work by the IDOE Project and by research programs in Germany and France, it has been posible to examine the detail of variability within well-defined regional patterns. Data from four small areas studied by the R/V Kana Keoki , R/V Moana Wave , and the F/S Valdivia , plus regional data within the Pacific equatorial nodule belt, show that the deposit variability is as high on a local as on a regional scale. An area 20 x 20 nautical miles, within the abyssal hill region of the northern Central Pacific, has been sampled intensively by R/V Valdivia during the VA-13/2 campaign. Selected manganese nodules retrieved either from free fall or box grabs were later analysed in laboratory using atomic absorption spectroscopy (AAS). It is likely that the samples were dried at 110°C for 24 hours and then ground for analytical purposes.
    Keywords: Atomic absorption spectrometry (AAS); BC; Box corer; Copper; Deposit type; DEPTH, sediment/rock; Event label; FFGR; Free-fall grab; Geochemistry; Identification; Iron; Manganese; manganese nodules; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Pacific Ocean; VA-13/2; VA13-2-106GBK; VA13-2-117KA; VA13-2-125KA; VA13-2-126KA; VA13-2-130GBH; VA13-2-133KA; VA13-2-136GBH; VA13-2-137GBH; VA13-2-138GBH; VA13-2-140GBH; VA13-2-141GBH; VA13-2-142GBH; VA13-2-143GBH; VA13-2-144GBH; VA13-2-145GBH; VA13-2-146GBH; VA13-2-147GBH; VA13-2-148KA; VA13-2-155KA; VA13-2-158-159GBH; VA13-2-164-165GBH; VA13-2-167-168GBH; VA13-2-170-171GBH; VA13-2-17GBH; VA13-2-24KAL; VA13-2-44KA; VA13-2-60GBH; VA13-2-61GBH; VA13-2-62GBH; VA13-2-63GBH; VA13-2-64GBH; VA13-2-65GBH; VA13-2-67GBH; VA13-2-68GBH; VA13-2-69GBH; VA13-2-70GBH; VA13-2-73GBH; VA13-2-74KA; VA13-2-81GBH; VA13-2-83KA; VA13-2-90GBH; VA13-2-99GBH; Valdivia (1961)
    Type: Dataset
    Format: text/tab-separated-values, 252 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Chemical composition of manganese nodules and crusts from the Central Pacific (2023)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: Of the 26 samples collected during VA-05/1 cruise of R V Valdivia during 1972, 19 were nodules of different forms, 4 ferromanganese crusts and 3 cylindral nodules. Nodules and crusts were air dried and pulverised. In case of cylindrical-types and crust material, the clayey-calcareous filling and core materials were removed. The powder was dried at 110°C for 24 hr. Samples were digested in an autoclave 'BOMB' with a mixture of HF-HCl-HNO3. Determinations were carried out on a PE atomic absorption spectrophotometer.
    Keywords: Aluminium; Atomic absorption spectrophotometry; Barium; Cadmium; Calcium; Chromium; Cobalt; Copper; Deposit type; DEPTH, sediment/rock; Dredge; DRG; ELEVATION; Event label; Geochemistry; Identification; Iron; LATITUDE; Lead; Location 26; LONGITUDE; Magnesium; Manganese; manganese micronodule; manganese nodule; Molybdenum; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Pacific Ocean; Potassium; sediment; Shape; Silicon; Sodium; Strontium; Texture; Titanium; VA-05/1; VA-05/1_26; Valdivia (1961); Vanadium; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 616 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
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