Unknown
PANGAEA
In:
Supplement to: Goddard, D A; Thompson, G; Jones, E J W; Okada, H (1987): The chemistry and mineralogy of ferromanganese encrustations on rocks from the Sierra Leone Rise, equatorial Mid-Atlantic Ridge and New England Seamount Chain. Marine Geology, 77(1-2), 87-98, https://doi.org/10.1016/0025-3227(87)90084-3
Publication Date:
2023-09-29
Description:
Chemical and mineralogical compositions of ferromanganese oxide coatings on rocks dredged from the New England Seamounts, the Sierra Leone Rise and the Mid-Atlantic Ridge near the Equator have been determined in an investigation of regional differences in Atlantic ferromanganese deposits. Most encrustations are clearly of hydrogenous origin, consisting mainly of todorokite and delta MnO2, but several recovered from the equatorial fracture zones may be hydrothermal accumulations. Differences in the chemistry of the water column and in growth rates of the ferromanganese coatings may be important in producing this regional contrast in composition. Fine-scale changes in element abundances within the encrustations indicate that the nature of the substrate has little influence on compositional variations.
Keywords:
NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
Type:
Dataset
Format:
application/zip, 5 datasets
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