Barnard, Leo A (2022): Comparative geochemistry of Mn nodules and micoodules from of the Gulf of Mexico, the Atlantic and the Pacific oceans [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.948695
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Published: 2022-09-21 • DOI registered: 2022-11-09
Abstract:
Ferromanganese microconcretions (FMC) were hand picked from four sieved size fractions (100, 200, 325 and 400 mesh) of sediment samples from four depths in a one meter gravity core taken in the Mid-Atlantic Ridge FAMOUS Area. Scanning electron microscopy and electron microprobe analysis were used to relate surface morphology and metal content to depth of burial, size fraction and apparent sediment redox conditions. Upper sediment (0-2 cm) FMC's were typified by rounded, botryoidal forms while FMC's taken from the redox boundary region (42-46 cm) showed signs of dissolution and had depressed Fe to Mn ratios (1.32 at the surface, 0.62 at 42-44 cm). Well crystallized pyritihedra were found in samples taken from the base of the core as well as in samples from the redox boundary.
Related to:
Barnard, Leo A (1982): Marine manganese accretions: Nodule micronodule comparisons among major ocean basins [dissertation]. Texas A & M University, College Station, Texas, U.S.A, 272 pp, https://hdl.handle.net/1969.1/DISSERTATIONS-346736
Barnard, Leo A; Scott, Martha R (1979): Ferromanganese microconcretions from the FAMOUS area (Abstract). EOS Transactions American Geophysical Union, 60(18), 281, https://doi.org/10.1029/EO060i018p00230
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):
Coverage:
Median Latitude: 21.050008 * Median Longitude: -84.708733 * South-bound Latitude: -7.633300 * West-bound Longitude: -147.300000 * North-bound Latitude: 36.933333 * East-bound Longitude: -33.218333
Date/Time Start: 1974-05-31T00:00:00 * Date/Time End: 1974-05-31T00:00:00
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 0.890 m
Event(s):
CH52-KS04 * Latitude: 36.933333 * Longitude: -33.218333 * Date/Time: 1974-05-31T00:00:00 * Elevation: -2944.0 m * Location: Atlantic Ocean * Campaign: RIFT74-CH52 * Basis: Jean Charcot * Method/Device: Gravity corer (GC)
GYRE77-6-5 * Latitude: 30.950000 * Longitude: -65.983300 * Elevation: -5000.0 m * Location: Atlantic Ocean * Method/Device: Gravity corer (GC) * Comment: "Campaign , Gyre"
GYRE78-6-8-2 * Latitude: 23.950000 * Longitude: -92.333300 * Elevation: -3649.0 m * Location: Gulf of Mexico * Method/Device: Box corer (BC) * Comment: "Campaign , Gyre"
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.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Barnard, Leo A | |||
| 2 | Latitude of event | Latitude | Barnard, Leo A | |||
| 3 | Longitude of event | Longitude | Barnard, Leo A | |||
| 4 | Elevation of event | Elevation | m | Barnard, Leo A | ||
| 5 | Identification | ID | Barnard, Leo A | |||
| 6 | DEPTH, sediment/rock | Depth sed | m | Barnard, Leo A | Geocode | |
| 7 | Aluminium | Al | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 8 | Barium | Ba | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 9 | Calcium | Ca | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 10 | Cobalt | Co | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 11 | Copper | Cu | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 12 | Iron | Fe | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 13 | Potassium | K | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 14 | Magnesium | Mg | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 15 | Manganese | Mn | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 16 | Sodium | Na | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 17 | Silicon | Si | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 18 | Titanium | Ti | % | Barnard, Leo A | Atomic absorption spectrometry (AAS) | |
| 19 | Deposit type | Deposit type | Barnard, Leo A | Fe-Mn deposit | ||
| 20 | Sediment type | Sediment | Barnard, Leo A |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
733 data points