Citation:

geppou26-11.html

Name: Analysis of Mn nodules from cruise GH72-2
Published: 1975
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The GH72-2 shipborne survey was carried out in the northwest Pacific during 31 days under the 'Basic investigations for exploration of deep sea mineral resources' program. The sediments encountered could be classified as follows: 1) Most of the brown clays occur on the abyssal plain of the basins at depth over 4500m. 2) Calcareous oozes are predominant at the top, slope and foot of seamounts and guyots. 3) Terrigeneous sediments are distributed near islands. The concentrated zone of ferromanganese nodules was located in the Magellan seamounts area. However, the metal contents in Mn, Cu, Ni and Co for these nodules are relatively poor, and these ferromanganese deposits occur at a depth over 5000m. It is interesting to note that the shape of the nodules is sometimes nearly spherical, and that the chemical composition of the nodules is characterized by the low ratio Mn/Fe and Co/Ni.

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:

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):

NOAA and MMS Marine Minerals Geochemical Database (NOAA-MMS)

Coverage:

Median Latitude: 15.062429 * Median Longitude: 153.620550 * South-bound Latitude: 8.795000 * West-bound Longitude: 148.312000 * North-bound Latitude: 19.033630 * East-bound Longitude: 158.675000

Date/Time Start: 1972-11-19T00:00:00 * Date/Time End: 1972-12-04T00:00:00

Event(s):

GH72-2-02 (72202) * Latitude: 8.795000 * Longitude: 158.675000 * Date/Time: 1972-11-19T00:00:00 * Elevation: -5160.0 m * Location: Pacific Ocean * Campaign: * Basis: Bosei Maru * Method/Device: Dredge (DRG)

GH72-2-06 (72206) * Latitude: 16.033630 * Longitude: 153.855010 * Date/Time: 1972-11-25T00:00:00 * Elevation: -5580.0 m * Location: Pacific Ocean * Campaign: * Basis: Bosei Maru * Method/Device: Dredge (DRG)

GH72-2-07 (72207) * Latitude: 16.016970 * Longitude: 153.566670 * Date/Time: 1972-11-25T00:00:00 * Elevation: -5635.0 m * Location: Pacific Ocean * Campaign: * Basis: Bosei Maru * 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

Takeda, H; Maruyama, S; Yamakado, N et al. (1975): (Table 6, Page 40) Size distribution of Mn nodules recovered during the GH72-2 cruise in the Northwest Pacific. https://doi.org/10.1594/PANGAEA.860654
Takeda, H; Maruyama, S; Yamakado, N et al. (1975): (Table 9, Page 43) Chemical composition of Mn nodules recovered during the GH72-2 cruise in the Northwest Pacific. https://doi.org/10.1594/PANGAEA.860655