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  • Data  (5)
  • NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS  (5)
  • 2015-2019
  • 1975-1979  (5)
  • 1945-1949
  • 1975  (5)
Collection
  • Data  (5)
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Keywords
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Years
  • 2015-2019
  • 1975-1979  (5)
  • 1945-1949
Year
  • 1
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    Unknown
    Chemical composition and rate of accumulation of manganese nodules in the western North Pacific (1975)
    PANGAEA
    In:  Supplement to: Sugimura, Y; Miyake, Yasuo; Yanagawa, Hatsue (1975): Chemical composition and the rate of accumulation of ferromanganese nodules in the Western North Pacific. Papers in Meteorology and Geophysics, 26(2), 47-54, https://doi.org/10.2467/mripapers1950.26.2_47
    Details
    Publication Date: 2023-08-28
    Description: The major and some of the minor constituents and the rate of accumulation of manganese nodules in the western North Pacific were determined. Manganese concentration in the nodules ranged from 20 to 30 per cent in the acid soluble fraction. As to the rare earth concentration, enrichment of cerium was observed in the manganese nodule as compared with that in shales or sea water. Thorium to uranium ratio in the nodule ranged from 9.4 to 14.3, which was very much higher than that in sea water. From the distribution of excess ionium, excess protactinium and Io/Th ratio, a rate of accumulation of 7 mm per million years was obtained with the surface layer of several mm in thickness of the JEDS-4-E4 nodule.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 2
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    Chemical analysis of manganese nodules from th Atlantic (1975)
    PANGAEA
    In:  Supplement to: Cronan, David S (1975): Manganese nodules and other ferromanganese oxide deposits from the Atlantic Ocean. Journal of Geophysical Research, 80(27), 3831-3837, https://doi.org/10.1029/JC080i027p03831
    Details
    Publication Date: 2023-08-28
    Description: Atlantic manganese nodules and encrustations are most abundant in areas of slow sedimentation beneath the carbonate compensation depth or where currents inhibit sediment accumulation. They principally contain the minerals todorokite and ?MnO2, which are selectively concentrated into nodules and encrustations, respectively, and which show an environmental differentiation thought to be related to redox potentials. Excluding the continental margins, todorokite is most abundant in deepwater deposits. Mineralogical differences between nodules influence their chemical compositions, Ni and Cu being most abundant in samples rich in todorokite and Co in those rich in ?MnO2. Chemically, the deposits differ from those in other major oceans principally in their higher Fe and lower Ni and Cu contents, which may be due to higher rates of supply of Fe to the deposits than those in the other oceans. Regional variations occur in the concentrations of several elements, Mn, Ni, and Cu being enriched in deepwater deposits from areas of slow sedimentation between the Mid-Atlantic Ridge and the continental margins and Co being enriched in some deposits from elevated localities. These variations are thought to be due to variation in the sources of the elements concerned and in the depositional environment.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 3
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    Unknown
    Description and chemical composition of manganese nodules collected during Hakuho Maru Cruise KH-72-2, Oct-Dec, 1972 in the Southwest Japan Arc and Ryukyu Arc areas (1975)
    PANGAEA
    In:  Supplement to: Kagami, Hideo (1975): Preliminary report of the Hakuho Maru Cruise KH-72-2 (The Southwest Japan Arc and Ryukyu Arc Areas), October 24 - December 15,1972. Ocean Research Institute, University of Tokyo, 144 pp, hdl:2261/58775
    Details
    Publication Date: 2023-08-28
    Description: The cores and dredges described in this report were taken on the KH-72-2 Expedition in October-December, 1972 by the Ocean Research Institute, University of Tokyo from the R/V Hakuho Maru. A total of 21 cores and dredge sites have been recovered.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
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    Unknown
    Description of Mn deposits and chemical composition of altered pelagic sediments of sites surveyed by R/V Vityaz in the Southern Basin of the Pacific Ocean (1975)
    PANGAEA
    In:  Supplement to: Andrushchenko, N F; Gradusov, Boris P; Yeroshchev-Shak, V A; Yanshina, R S; Borisovskiy, Sergey Ye (2009): Composition and structure of metamorphosed ferromanganese nodules, new vein formations of manganese hydroxides, and the surrounding pelagic sediments in the Southern Basin of the Pacific Ocean floor. International Geology Review, 17(12), 1375-1392, https://doi.org/10.1080/00206817509471540
    Details
    Publication Date: 2023-08-28
    Description: The object of the detailed investigations was an unusual material collected in the region of the Southern Basin of the Pacific Ocean floor, with features of intense manifestation of volcanic processes and subsequent hydrothermal alterations. These processes to a significant degree transformed the ferromanganese nodules and the pelagic sediments, causing the development of a new type of oceanic manganese mineralization.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 5
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    Unknown
    Annotated record and chemical analysis of manganese nodules from R/V Moana Wave Cruise Mn-74-01 and Mn-74-02 stations (1975)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: Cruise Mn-74-02 of the R/V MOANA WAVE was the second part of the field work of the NSF/IDOE Inter-University Ferromanganese Research Program in 1974, and we gratefully acknowledge the support of the office for the International Decade of Ocean Exploration and the Office of Oceanographic Facilities and Support. This program was designed to investigate the origin, growth, and distribution of copper/nickel-rich manganese nodules in the Pacific Ocean. The field effort was designed to satisfy sample requirements of the fifteen principal investigators, while increasing general knowledge of the copper/nickel-rich nodule deposits of the equatorial Pacific. This report is the second of a series of cruise reports designed to assist sample requests for documented nodules, sediment, and water samples so that laboratory results can be realistically compared and related to the environment of nodule growth. Nodule samples and bathymetric and navigational data are archived at the Hawaii Institute of Geophysics, University of Hawaii. Bulk chemical analyses of nodules and reduction of survey data were carried out at Hawaii. Sediment cores were stored at the University of Hawaii and at Scripps Institution of Oceanography. The SIO analytical facility provided stratigraphic data on sediment chemistry.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
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