Analysis of manganese crusts from Galapagos
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
1976
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| _version_ | 1867169515040669696 |
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| author | Moore, Willard S Vogt, Peter R |
| author_facet | Moore, Willard S Vogt, Peter R |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Manganese oxide crusts similar to those reported from the Mid-Atlantic Ridge rift valley by Scott et al., 1974 (https://doi.pangaea.de/10.1594/PANGAEA.848726) were dredged at two sites near the Galapagos spreading axis on ocean floor estimated from magnetic anomalies to be 2.4 and 0.3 m.y. old. Compared to the typical ocean-floor manganese deposits attributed to precipitation from seawater, the 2-6 cm thick manganese crusts reported here exhibit very low Fe/Mn and low 232Th/238U ratios, as well as lower transition metal and higher manganese concentrations. The manganese crusts were deposited several orders of magnitude faster than the more common hydrogenous nodules; this fact together with other geochemical characteristics and the geophysical environment suggests the manganese deposits reported here are of hydrothermal origin. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_882356 |
| institution | PANGAEA |
| language | en |
| publishDate | 1976 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Analysis of manganese crusts from Galapagos Moore, Willard S Vogt, Peter R NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS Manganese oxide crusts similar to those reported from the Mid-Atlantic Ridge rift valley by Scott et al., 1974 (https://doi.pangaea.de/10.1594/PANGAEA.848726) were dredged at two sites near the Galapagos spreading axis on ocean floor estimated from magnetic anomalies to be 2.4 and 0.3 m.y. old. Compared to the typical ocean-floor manganese deposits attributed to precipitation from seawater, the 2-6 cm thick manganese crusts reported here exhibit very low Fe/Mn and low 232Th/238U ratios, as well as lower transition metal and higher manganese concentrations. The manganese crusts were deposited several orders of magnitude faster than the more common hydrogenous nodules; this fact together with other geochemical characteristics and the geophysical environment suggests the manganese deposits reported here are of hydrothermal origin. |
| title | Analysis of manganese crusts from Galapagos |
| topic | NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS |
| url | https://doi.org/10.1594/PANGAEA.882356 |