Detailed description of manganese nodules and micronodules from the R/V Valdivia VA-13/2 campaign
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2022
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| _version_ | 1867172343481106432 |
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| author | von Stackelberg, Ulrich |
| author_facet | von Stackelberg, Ulrich |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | An area 20 x 20 nautical miles, within the abyssal hill region of the northern Central Pacific, has been sampled intensively by R/V Valdivia . The sediments represent four facies characterized by variations in color, structure and composition. A marked unconformity between facies II and III was dated by radiolaria and coccoliths as early Miocene to late Pliocene and is explained by an intensification of AABW circulation. A maximum of reworking, dissolution of siliceous organisms and growth of authigenic minerals is noted above and below this unconformity. Dissolution of siliceous organisms seems to control the growth of minerals such as zeolites and Fe-Mn-oxides. Fe-Mn-oxides were precipitated both as micro and macro nodules. While the micro nodules remained in place, most of the macronodules were pushed upwards by benthic organisms and were kept at the sediment surface. Thus, the surface nodules appear to be 'foreigners' in the recent sediments and represent the conditions of a past environment. During the VA-13/2 campaign 79 cores were taken from 60 locations. Fine scale sedimentary structures were determined using radiography of 252 samples. Mn nodules either at the surface or inside the cores were described. 2.0 cm thick samples were taken for sedimentological and bio-stratigraphical studies. Smear slides were also examined for the determination of Mn micronodule components. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_942658 |
| institution | PANGAEA |
| language | en |
| publishDate | 2022 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Detailed description of manganese nodules and micronodules from the R/V Valdivia VA-13/2 campaign von Stackelberg, Ulrich Deposit type; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Description; Elevation of event; Event label; Identification; Latitude of event; Longitude of event; manganese enrichment; Method/Device of event; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Pacific Ocean; PC; Piston corer; Position; Quantity of deposit; Sediment Classification; Sediment type; VA-13/2; VA13-2-135KL; VA13-2-156KL; VA13-2-157KL; VA13-2-163KL; VA13-2-166KL; VA13-2-169KL; VA13-2-172KL; VA13-2-180KL; VA13-2-183KL; VA13-2-196KL; VA13-2-198KL; VA13-2-199KL; VA13-2-227KL; VA13-2-231KL; VA13-2-25KAL; VA13-2-26KL; VA13-2-27KL; VA13-2-45KL; VA13-2-46KL; VA13-2-59KL; Valdivia (1961) An area 20 x 20 nautical miles, within the abyssal hill region of the northern Central Pacific, has been sampled intensively by R/V Valdivia . The sediments represent four facies characterized by variations in color, structure and composition. A marked unconformity between facies II and III was dated by radiolaria and coccoliths as early Miocene to late Pliocene and is explained by an intensification of AABW circulation. A maximum of reworking, dissolution of siliceous organisms and growth of authigenic minerals is noted above and below this unconformity. Dissolution of siliceous organisms seems to control the growth of minerals such as zeolites and Fe-Mn-oxides. Fe-Mn-oxides were precipitated both as micro and macro nodules. While the micro nodules remained in place, most of the macronodules were pushed upwards by benthic organisms and were kept at the sediment surface. Thus, the surface nodules appear to be 'foreigners' in the recent sediments and represent the conditions of a past environment. During the VA-13/2 campaign 79 cores were taken from 60 locations. Fine scale sedimentary structures were determined using radiography of 252 samples. Mn nodules either at the surface or inside the cores were described. 2.0 cm thick samples were taken for sedimentological and bio-stratigraphical studies. Smear slides were also examined for the determination of Mn micronodule components. |
| title | Detailed description of manganese nodules and micronodules from the R/V Valdivia VA-13/2 campaign |
| topic | Deposit type; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Description; Elevation of event; Event label; Identification; Latitude of event; Longitude of event; manganese enrichment; Method/Device of event; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Pacific Ocean; PC; Piston corer; Position; Quantity of deposit; Sediment Classification; Sediment type; VA-13/2; VA13-2-135KL; VA13-2-156KL; VA13-2-157KL; VA13-2-163KL; VA13-2-166KL; VA13-2-169KL; VA13-2-172KL; VA13-2-180KL; VA13-2-183KL; VA13-2-196KL; VA13-2-198KL; VA13-2-199KL; VA13-2-227KL; VA13-2-231KL; VA13-2-25KAL; VA13-2-26KL; VA13-2-27KL; VA13-2-45KL; VA13-2-46KL; VA13-2-59KL; Valdivia (1961) |
| url | https://doi.org/10.1594/PANGAEA.942658 |