(Table 8.4, Page 220-223) Chemical composition of different growth structures of manganese nodules, SONNE cruise SO79
Fuente:
PANGAEA
Saved in:
| Main Author: | |
|---|---|
| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2000
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1867169109537456128 |
|---|---|
| author | von Stackelberg, Ulrich |
| author_facet | von Stackelberg, Ulrich |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | In the nodule field of the Peru Basin, situated south of the zone of high bioproductivity, a relatively high flux of biogenic matter explains a distinct redox boundary at about 10 cm depth separating very soft oxic surface sediments from stiffer suboxic sediments. Maximum abundance (50 kg/m**2) of diagenetic nodules is found near the calcite compensation depth (CCD), currently at 4250 m. There, the accretion rate of nodules is much higher (100 mm/Ma) than on ridges (5 mm/Ma). Highest accretion rates are found at the bottom of large nodules that repeatedly sink to a level immediately above the redox boundary. There, distinct diagenetic growth conditions prevail and layers of dense laminated Mn oxide of very pure todorokite are formed. The layering of nodules is mainly the result of organisms moving nodules within the oxic surface sediment from diagenetic to hydrogenetic environments. The frequency of such movements is much higher than that of climatic changes. Two types of nodule burial occur in the Peru Basin. Large nodules are less easily moved by organisms and become buried. Consequently, buried nodules generally are larger than surface nodules. This type of burial predominates in basins. At ridges where smaller nodules prevail, burial is mainly controlled by statistical selection where some nodules are not moved up by organisms. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_856995 |
| institution | PANGAEA |
| language | en |
| publishDate | 2000 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 8.4, Page 220-223) Chemical composition of different growth structures of manganese nodules, SONNE cruise SO79 von Stackelberg, Ulrich BCR; Box corer (Reineck); Cobalt; Copper; Date/Time of event; DEPTH, sediment/rock; Description; Diameter, maximum; DISTANCE; Elevation of event; Event label; FFGR; Free-fall grab; GIK15561-1; GIK15573-1; Iron; KAL; Kasten corer; Latitude of event; Longitude of event; Manganese; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Peru Basin; Sample ID; SEDIPERU - TUSCH; SO79; SO79_165KG; SO79_40BG; SO79_63KG; SO79_64KA; Sonne; X-ray fluorescence (XRF) In the nodule field of the Peru Basin, situated south of the zone of high bioproductivity, a relatively high flux of biogenic matter explains a distinct redox boundary at about 10 cm depth separating very soft oxic surface sediments from stiffer suboxic sediments. Maximum abundance (50 kg/m**2) of diagenetic nodules is found near the calcite compensation depth (CCD), currently at 4250 m. There, the accretion rate of nodules is much higher (100 mm/Ma) than on ridges (5 mm/Ma). Highest accretion rates are found at the bottom of large nodules that repeatedly sink to a level immediately above the redox boundary. There, distinct diagenetic growth conditions prevail and layers of dense laminated Mn oxide of very pure todorokite are formed. The layering of nodules is mainly the result of organisms moving nodules within the oxic surface sediment from diagenetic to hydrogenetic environments. The frequency of such movements is much higher than that of climatic changes. Two types of nodule burial occur in the Peru Basin. Large nodules are less easily moved by organisms and become buried. Consequently, buried nodules generally are larger than surface nodules. This type of burial predominates in basins. At ridges where smaller nodules prevail, burial is mainly controlled by statistical selection where some nodules are not moved up by organisms. |
| title | (Table 8.4, Page 220-223) Chemical composition of different growth structures of manganese nodules, SONNE cruise SO79 |
| topic | BCR; Box corer (Reineck); Cobalt; Copper; Date/Time of event; DEPTH, sediment/rock; Description; Diameter, maximum; DISTANCE; Elevation of event; Event label; FFGR; Free-fall grab; GIK15561-1; GIK15573-1; Iron; KAL; Kasten corer; Latitude of event; Longitude of event; Manganese; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Peru Basin; Sample ID; SEDIPERU - TUSCH; SO79; SO79_165KG; SO79_40BG; SO79_63KG; SO79_64KA; Sonne; X-ray fluorescence (XRF) |
| url | https://doi.org/10.1594/PANGAEA.856995 |