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Recent studies on marine ferromanganese nodules have suggested a relationship between their growth rate and their chemical composition. The suggestion is based on the hypothesis that the metals in nodules have two sources of supply: bottom seawater (hydrogenous) and sediment pore water (diagenetic). The diagenetic source calls for upward diffusion of Mn mobilized in a deeper, low Eh zone of the sediment column and its subsequent precipitation in an oxidized surface zone. Addition of the remobilized Mn to surface nodules would augment their accretion rate. It would also render the oxide layers to contain higher Mn/Fe ratios than layers resulting from hydrogenous precipitation. We report here a radiometrically determined accretion rate of 168±24 mm/Myr for a deep-sea manganese nodule from the Peru Basin in the Pacific. This rate is about two orders of magnitude higher than that frequently found in nodules of deep-sea origin, and emphasizes the importance of sediment diagenetic processes on the growth of manganese concretions.

Pertenece a

PANGAEA - Publishing Network for Geoscientific & Environmental Data  

Autor(es)

Reyss, Jean -  Louis -  Marchig, Vesna -  Ku, Teh -  Lung - 

Id.: 71245225

Idioma: inglés  - 

Versión: 1.0

Estado: Final

Tipo:  text/tab-separated-values, 119 data points - 

Palabras claveAlpha spectrometry -  Atomic absorption spectrometry (AAS) -  Deposit type -  DEPTH, sediment/rock -  Description -  DISTANCE -  Distance, maximum -  Distance, minimum -  Dredge, box -  DRG_B -  Identification -  Iron -  Manganese -  NOAA and MMS Marine Minerals Geochemical Database -  NOAA -  MMS -  Peru Basin, Pacific Ocean -  SO11 -  SO11_278DK -  Sonne -  SOPAC II -  Thorium 227 -  Thorium 227, standard deviation -  Thorium 230 -  Thorium 230, standard deviation -  Thorium 232 -  Thorium 232, standard deviation -  Uranium 234 -  Uranium 234, standard deviation -  Uranium 234/Uranium 238 activity ratio -  Uranium 234/Uranium 238 activity ratio, standard deviation - 

Cobertura:  LATITUDE: -7.666700 * LONGITUDE: -91.991667 * DATE/TIME START: 1979-01-01T00:00:00 * DATE/TIME END: 1979-01-01T00:00:00 * MINIMUM ELEVATION: -4240.0 m * MAXIMUM ELEVATION: -4240.0 m - 

Tipo de recurso: Dataset  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: CC-BY: Creative Commons Attribution 3.0 Unported

Formatos:  text/tab-separated-values, 119 data points - 

Requerimientos técnicos:  Browser: Any - 

Relación: [IsBasedOn] Supplement to: Reyss, Jean-Louis; Marchig, Vesna; Ku, Teh-Lung (1982): Rapid growth of a deep-sea manganese nodule. Nature, 295(5848), 401-403, https://doi.org/10.1038/295401a0
[References] Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V52Z13FT
[References] Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V53X84KN

Fecha de contribución: 25-may-2018

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