Geochemistry on manganese deposit from the Median Valley of the Mid-Atlantic Ridge
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
1974
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| _version_ | 1867167673227411456 |
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| author | Scott, Martha R Scott, Robert B Rona, Peter A Butler, Louis W Nalwalk, Andrew J |
| author_facet | Scott, Martha R Scott, Robert B Rona, Peter A Butler, Louis W Nalwalk, Andrew J |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_848726 |
| institution | PANGAEA |
| language | en |
| publishDate | 1974 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry on manganese deposit from the Median Valley of the Mid-Atlantic Ridge Scott, Martha R Scott, Robert B Rona, Peter A Butler, Louis W Nalwalk, Andrew J NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS 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. |
| title | Geochemistry on manganese deposit from the Median Valley of the Mid-Atlantic Ridge |
| topic | NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS |
| url | https://doi.org/10.1594/PANGAEA.848726 |