Calvert, Stephen E; Price, N B (1970): Geochemistry on manganese nodules from Loch Fyne, Scotland [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.848802, Supplement to: Calvert, SE; Price, NB (1970): Composition of manganese nodules and manganese carbonates from Loch Fyne, Scotland. Contributions to Mineralogy and Petrology, 29(3), 215-233, https://doi.org/10.1007/BF00373306
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Abstract:
Manganese nodules and manganese carbonate concretions occur in the upper 10-15 cm of the Recent sediments of Loch Fyne, Argyllshire in water depths of 180-200 m. The nodules are spherical, a few mm to 3 cm in diameter, and consist of a black, Mn-rich core and a thin, red, Fe-rich rim. The carbonate occurs as irregular concretions, 0.5-8 cm in size, and as a cement in irregular nodule and shell fragment aggregates. It partially replaces some nodule material and clastic silicate inclusions, but does not affect aragonitic and calcitic shell fragments. The nodules are approximately 75% pure oxides and contain 30% Mn and 4% Fe. In the cores, the principal mineral phase is todorokite, with a Mn/Fe ratio of 17. The rim consists of X-ray amorphous Fe and Mn oxides with a Mn/Fe ratio of 0.66. The cores are enriched, relative to Al, in K, Ba, Co, Mo, Ni and Sr while the rims contain more P, Ti, As, Pb, Y and Zn. The manganese carbonate has the composition (Mn47.7 Ca45.1 Mg7.2) CO3. Apart from Cu, all minor elements are excluded from significant substitution in the carbonate lattice. Manganese nodules and carbonates form diagenetically within the Recent sediments of Loch Fyne. This accounts for the high Mn/Fe ratios in the oxide phases and the abundance of manganese carbonate concretions. Mn concentrations in the interstitial waters of sediment cores are high (ca. 10 ppm) as also, by inference, are the dissolved carbonate concentrations.
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
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Coverage:
Median Latitude: 55.846968 * Median Longitude: -5.330625 * South-bound Latitude: 55.838950 * West-bound Longitude: -5.343210 * North-bound Latitude: 55.855240 * East-bound Longitude: -5.318200
Date/Time Start: 1878-09-21T00:00:00 * Date/Time End: 1969-01-01T00:00:00
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
- Calvert, SE; Price, NB (1970): (Table 1, page 218), Comparison of Mn and selected minor element determinations for manganese nodules by X-ray emission, volumetric and atomic absorption spectrophotometric methods. https://doi.org/10.1594/PANGAEA.848799
- Calvert, SE; Price, NB (1970): (Table 2, page 222), Chemical compositions of manganese nodules and manganese carbonate from Loch Fyne, Argllshire. https://doi.org/10.1594/PANGAEA.848801