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Shima, Makoto; Okada, Akihiko (1974): Geochemical composition of a representative collection of manganese nodules and slabs collected in the Western Pacific. PANGAEA,, Supplement to: Shima, M; Okada, A (1974): Study on the managanese nodule (VIII) Inhomogeneous chemical distribution of manganese nodules (in Japanese). Scientific Report of the Institute of Physical and Chemical Research, 50, 151-158, hdl:10013/epic.46490.d001

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Chemical analyses were performed on seveteen manganese nodules collected from the Pacific Ocean floor. The results were discussed compared with the previous data on the manganese nodules. Minerals were found to be todorokite, delta-MnO2 and other silicates, montmorillonite, illite, phillipsite and alpha-SiO2. Average composition shows that copper is concentrated on the deep sea nodules more than the shallow ones, and that the todorokite rich nodules contain more copper and nickel than the delta-MnO2 rich ones.
Source data set:
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,
Further details:
Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA,
Median Latitude: 7.576707 * Median Longitude: -154.586448 * South-bound Latitude: -35.075000 * West-bound Longitude: 145.033330 * North-bound Latitude: 26.183330 * East-bound Longitude: -114.108330
Date/Time Start: 1969-07-08T00:00:00 * Date/Time End: 1971-12-24T00:00:00
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1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions.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 propriatory 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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