Manheim, Frank T; Pratt, Richard M; McFarlin, P F (1980): Observations and rare earth element composition of manganese nodules during Atlantis cruise AT266, Blake Plateau [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.861915, Supplement to: Manheim, FT et al. (1980): Composition and origin of phosphorite deposits of the Blake Plateau. In: Bentor, Y.K. (Ed.), Marine Phosphorites - Geochemistry, Occurrence, Genesis, Society of Economic Paleontologists and Mineralogists, Special Publication, 29, 117-137, Manheim-etal_1980.pdf
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Abstract:
An area of about 22,000 km² on the northern Blake Plateau, off the coast of South Carolina, contains an estimated 2 billion metric tons of phosphorite concretions, and about 1.2 billion metric tons of mixed ferromanganese-phosphorite pavement. Other offshore phosphorites occur between the Blake Plateau and known continental deposits, buried under variable thicknesses of sediments. The phosphorite resembles other marine phosphorites in composition, consisting primarily of carbonate-fluorapatite, some calcite, minor quartz and other minerals. The apatite is optically pseudo-isotropic and contains about 6% [CO3]**2- replacing [PO4]**3- in its structure. JOIDES drillings and other evidence show that the phosphorite is a lag deposit derived from Miocene strata correlatable with phosphatic Middle Tertiary sediments on the continent. It has undergone variable cycles of erosion, reworking, partial dissolution and reprecipitation. Its present form varies from phosphatized carbonate debris, loose pellets, and pebbles, to continuous pavements, plates, and conglomeratic boulders weighing hundreds of kilograms. No primary phosphatization is currently taking place on the Blake Plateau. The primary phosphate-depositing environment involved reducing conditions and required at least temporary absence of the powerful Gulf Stream current that now sweeps the bottom of the Blake Plateau and has eroded away the bulk of the Hawthorne-equivalent sediments with which the phosphorites were once associated.
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: 31.687867 * Median Longitude: -77.720464 * South-bound Latitude: 30.975285 * West-bound Longitude: -78.524989 * North-bound Latitude: 32.008000 * East-bound Longitude: -77.453000
Date/Time Start: 1961-06-27T00:00:00 * Date/Time End: 1961-07-18T00:00:00
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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2 datasets
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Datasets listed in this publication series
- Manheim, FT; Pratt, RM; McFarlin, PF (1980): (Table 6, page 130) Rare Earth distribution in a manganese nodule from the Blake Plateau deposits, Altantic cruise 266. https://doi.org/10.1594/PANGAEA.861914
- Manheim, FT; Pratt, RM; McFarlin, PF (1980): Observation of manganese deposits in the Blake Plateau during Atlantis Cruise 266. https://doi.org/10.1594/PANGAEA.861913