(Table 8.4, Page 220-223) Chemical composition of different growth structures of manganese nodules, SONNE cruise SO78
Cobertura |
MEDIAN LATITUDE: -7.102100 * MEDIAN LONGITUDE: -90.678825 * SOUTH-BOUND LATITUDE: -8.276700 * WEST-BOUND LONGITUDE: -90.706000 * NORTH-BOUND LATITUDE: -6.610000 * EAST-BOUND LONGITUDE: -90.626800 * DATE/TIME START: 1992-05-01T00:00:00 * DATE/TIME END: 1992-05-27T00:00:00 * MINIMUM DISTANCE: 0.0 cm * MAXIMUM DISTANCE: 12.0 cm |
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Data(s) |
18/01/2000
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Resumo |
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. |
Formato |
text/tab-separated-values, 1280 data points |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.856995 doi:10.1594/PANGAEA.856995 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Relação |
Grant, J Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, doi:10.7289/V52Z13FT Figure 8.11 (a) Large cauliflower-shaped nodule with smooth surface texture (s) on the bottom side and rough surface texture (r) on the top side. 25 KG from area SEDIPERU at 4170 m water depth (URI: hdl:10013/epic.46633.d004) Figure 8.11 (b) Polished section of a nodule with a nucleus of a cetacean earbone showing asymmetric growth of pale-grey dense, laminated h-type (dense and laminated) layers at the lower part. 63 KG from area SPN at 4257 m water depth (URI: hdl:10013/epic.46633.d005) Figure 8.17 (a) Photograph of polished section of a nodule. h-type (dense and laminated) growth layer with inclusions of diatoms (URI: hdl:10013/epic.46633.d006) Figure 8.17 (b) Photograph of polished section of a nodule. h-type (dense and laminated) growth layer with todorokite crystals up to 15 micron long (URI: hdl:10013/epic.46633.d007) Figure 8.17 (c) Photograph of polished section of a nodule. h-growth (dense and laminated) in upper half changes to d-growth (dentritic) at a sharp boundary starting with dark-grey laminated to columnar Mn oxide similar to b-growth (laminated to columnar) (URI: hdl:10013/epic.46633.d008) Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, doi:10.7289/V53X84KN |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: von Stackelberg, Ulrich (2000): Manganese nodules of the Peru Basin (Chapter 8). In: Cronan, D.S. (Ed.), Handbook of Marine Mineral Deposits. CRC Press, Boca Raton, Florida, USA, 197-238 |
Palavras-Chave | #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) |
Tipo |
Dataset |