Geochemistry on sediment and nodules from the Madeira Abyssal Plain
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| Autores principales: | , , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
1991
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| _version_ | 1867167676019769344 |
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| author | Ebbing, J van der Borg, Klaas de Jong, Arie F M Nederlof, H P |
| author_facet | Ebbing, J van der Borg, Klaas de Jong, Arie F M Nederlof, H P |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The accretion rate of manganese nodules and the sedimentation rate of the underlying sediment has been studied with 10Be and 14C on a nodule covered hill in the Madeira Abyssal Plain. The accretion rate of (3.2 +/- 0.6) mm/Ma for the nodules is considerably smaller than the average sedimentation rate of 12 mm/ka for the last 50-100 ka. The mechanism that kept the nodules at the surface in this specific environment during the last 40 ka is likely to be flotation. The discovery of a large manganese-covered concretion in a piston core points to a long period of sediment winnowing. The 14C analyses also seem to point to an increase in the sedimentation rate round 6500 yrs B.P. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_888582 |
| institution | PANGAEA |
| language | en |
| publishDate | 1991 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry on sediment and nodules from the Madeira Abyssal Plain Ebbing, J van der Borg, Klaas de Jong, Arie F M Nederlof, H P NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS The accretion rate of manganese nodules and the sedimentation rate of the underlying sediment has been studied with 10Be and 14C on a nodule covered hill in the Madeira Abyssal Plain. The accretion rate of (3.2 +/- 0.6) mm/Ma for the nodules is considerably smaller than the average sedimentation rate of 12 mm/ka for the last 50-100 ka. The mechanism that kept the nodules at the surface in this specific environment during the last 40 ka is likely to be flotation. The discovery of a large manganese-covered concretion in a piston core points to a long period of sediment winnowing. The 14C analyses also seem to point to an increase in the sedimentation rate round 6500 yrs B.P. |
| title | Geochemistry on sediment and nodules from the Madeira Abyssal Plain |
| topic | NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS |
| url | https://doi.org/10.1594/PANGAEA.888582 |