Friedrich, Günther; Kunzendorf, Helmar; Plüger, W L (1974): Chemical composition of manganese micronodules from expedition VA-05/1 in the Pacific Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.865317, Supplement to: Friedrich, G et al. (1974): Ship-borne geochemical investigations of deep-sea manganese-nodule deposits in the Pacific using a radioisotope energy-dispersive X-ray system. Journal of Geochemical Exploration, 3(4), 303-317, https://doi.org/10.1016/0375-6742(74)90001-6
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Abstract:
A radioisotope energy-dispersive X-ray (EDX) system has been used on board the German research vessel "Valdivia" during an exploration expedition in the northern equatorial Pacific in 1973. The instrumentation used consisted of an X-ray detection system incorporating a 30 mm2 effective-area Si (Li) detector with a measured energy resolution of 195 eV for Mn K alpha X-rays, standard nuclear electronics, a 1024-channel analyser and a data read-out unit. The X-ray spectra in the manganese-nodule samples were excited by a 30-mCi 238Pu source. The six elements Mn, Fe, Co, Ni, Cu and Zn were analysed on board. Precision values for the analyses were less than 3% for Mn, Fe, Ni, Cu and Zn and about 5% for Co. A total amount of 350 analyses was carried out during a one-month cruise. Average contents of 190 analysed whole manganese-nodule samples from all the sampling sites of the covered area were 23.3% Mn, 6.7% Fe, 0.23% Co, 1.16% Ni, 0.94% Cu and 0.10% Zn. The average content of the base metals expressed as the sum of the Co, Ni, Cu and Zn contents was 2.48%. A linear relationship between Mn and Ni in all analysed samples, including whole manganese-nodule samples, zones of manganese nodules and manganese crusts, was observed. The Mn/Ni ratio calculated by regression analysis was 23.0. Zonal variations of the chemical contents of the six elements in the manganese nodules were found. A size classification of the manganese nodules has been suggested. Geochemical correlations of Cu and Ni versus Mn/Fe in the investigated samples are given.
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. 4. Macrophoto of one half of an unpolished manganese nodule with a small nucleus and distinct concentric zones. (Location 9, expedition VA-05/1)
Fig. 5. Manganese-iron-rich crust growing on altered andesitic rock material. (Location 12, dredge DK20, station 51, expedition VA-05/1)
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:
Median Latitude: 10.068507 * Median Longitude: -147.794000 * South-bound Latitude: 7.950000 * West-bound Longitude: -152.500000 * North-bound Latitude: 11.100000 * East-bound Longitude: -146.300000
Date/Time Start: 1973-04-01T00:00:00 * Date/Time End: 1973-04-01T00:00:00
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.
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Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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Datasets listed in this publication series
- Friedrich, G; Kunzendorf, H; Plüger, WL (1974): Chemical composition of manganese nodules and crusts from expedition VA-05/1 in the Pacific Ocean using Atomic absorption analysis. https://doi.org/10.1594/PANGAEA.865314
- Friedrich, G; Kunzendorf, H; Plüger, WL (1974): Chemical composition of manganese nodules from expedition VA-05/1 in the Pacific Ocean using radioisotope energy-dispersive X-ray analysis (EDX). https://doi.org/10.1594/PANGAEA.865315
- Friedrich, G; Kunzendorf, H; Plüger, WL (1974): Chemical composition of manganese micronodules from expedition VA-05/1 in the Pacific Ocean using X-ray microprobe analysis. https://doi.org/10.1594/PANGAEA.865316