Scott, Martha R; Scott, Robert B; Rona, Peter A; Butler, Louis W; Nalwalk, Andrew J (1974): Geochemistry on manganese deposit from the Median Valley of the Mid-Atlantic Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.848726, Supplement to: Scott, MR et al. (1974): Rapidly accumulating manganese deposit from the Median Valley of the Mid-Atlantic Ridge. Geophysical Research Letters, 1(8), 355-358, https://doi.org/10.1029/GL001i008p00355
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Abstract:
A manganese oxide crust from an extensive deposit in the median valley of the Mid-Atlantic Ridge was found to be unusually high in manganese (up to 39.4% Mn), low in Fe (as low as 0.01% Fe), low in trace metals and deficient in Th230 and Pa231 with respect to the parent uranium isotopes in the sample. The accumulation rate is 100 mm to 200 mm/10 million year, or 2 orders of magnitude faster than the typical rate for deep-sea ferromanganese deposits. The rapid growth rate and unusual chemistry are consistent with a hydrothermal origin or with a diagenetic origin by manganese remobilized from reduced sediments. Because of the association with an active ridge, geophysical evidence indicative of hydrothermal activity, and a scarcity of sediment in the sampling area, we suggest that a submarine hot spring has created the deposit.
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Coverage:
Median Latitude: 26.877486 * Median Longitude: -41.131550 * South-bound Latitude: 26.116700 * West-bound Longitude: -45.105000 * North-bound Latitude: 30.133000 * East-bound Longitude: -25.350000
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1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions.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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3 datasets
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Datasets listed in this publication series
- Scott, MR; Scott, RB; Rona, PA et al. (1974): (Table 1a, Page 356), Radiometric data for manganese crusts; typical crusts from the Atlantis Fracture Zone. https://doi.org/10.1594/PANGAEA.848712
- Scott, MR; Scott, RB; Rona, PA et al. (1974): (Table 1b, Page 356), Radiometric data from manganese crusts; sample 13-21 from the median valley of the Mid-Atlantic Ridge. https://doi.org/10.1594/PANGAEA.848724
- Scott, MR; Scott, RB; Rona, PA et al. (1974): (Table 2, Page 357), Compositions of layers within the largest fragment of the Site 13 manganese deposit and from sites 15 and 19 within 50 km of site 13. https://doi.org/10.1594/PANGAEA.848725