Bonté, Philippe (2022): Relationships between the Fe-Mn deposits from the Romanche Trench and its hydrothermal environment [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.949950
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Abstract:
The geological characteristics and Fe-Mn deposits from the North wall of the Romanche trench (Atlantic ocean) were studied in order to investigate possible relationships of these deposits with hydrothermalism. The results indicate diffuse hydrothermal activity in all of the rock samples which may explain the notable mineralogical associations observed, such as talc-dolomite-hematite-serpentine. All rock outcrops were covered with Fe-Mn deposits, but no such deposits were noted on sedimentary platforms. The variations in average chemical composition are very low among the different deposits, with the exception of one peculiar encrustation, explained by a local and short-term anomaly of redox potential. Hence, the phenomenon which produces these deposits is not localized. From this study, we conclude that marine Fe-Mn deposits result from the continuous supply of terrigenous iron and discontinuous supply of manganese, probably hydrothermal in origin. Detrital particles and numerous chemical elements are scavenged during the accretion process itself, whereas some trace elements, among the least soluble (Co, Ti, Th, Ce), are adsorbed on these deposits, independently of the accretion. This explains the inverse variation of the content of these elements versus deposit thickness.
Related to:
Bonté, Philippe (1981): Relations entre l'environnement et les caractéristiques des concrétions polymétalliques marines dans la fosse de la Romanche [dissertation]. Université Paris XI Orsay, Orsay, France, 243 pp, 13677600.pdf
Source:
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
Further details:
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
Project(s):
Coverage:
Median Latitude: 1.959116 * Median Longitude: -21.230494 * South-bound Latitude: -0.167000 * West-bound Longitude: -50.750000 * North-bound Latitude: 23.400000 * East-bound Longitude: -18.200000
Date/Time Start: 1971-05-01T00:00:00 * Date/Time End: 1977-12-14T00:00:00
Comment:
It is worth noting that in this table the author has ratioed isotope concentrations (ex: 230TH/232Th) while measuring each of them using inherently different methods (ex: 230Th using Alpha spectrometry and 232Th using Wet chemistry determination). Thus these terms have been labeled as plain "ratio" rather than "activity ratio".
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
5 datasets
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Datasets listed in this bundled publication
- Bonté, P (2022): Energy dispersive X-Ray analysis (EDAX) of layers inside manganese crusts retrieved by the R/V Jean Charcot on the Romanche trench area (Atlantic ocean). https://doi.org/10.1594/PANGAEA.949946
- Bonté, P (2022): Chemical analysis of manganese nodules and crusts from the Romanche trench area (Atlantic ocean). https://doi.org/10.1594/PANGAEA.949949
- Bonté, P (2022): Radiochemical data for sediments of cores CH71-08 and CH71-09, HARMATTAN campaign of the R/V Jean Charcot on the Romanche trench area (Atlantic ocean). https://doi.org/10.1594/PANGAEA.949941
- Bonté, P (2022): Radiochemical data for layers inside a buried manganese nodule from core CH71-09, HARMATTAN campaign of the R/V Jean Charcot on the Romanche trench area (Atlantic ocean). https://doi.org/10.1594/PANGAEA.949943
- Bonté, P (2022): Radiochemical data for layers inside manganese crusts retrieved during the ROMANCHA campaign of the R/V Jean Charcot on the Romanche trench area (Atlantic ocean). https://doi.org/10.1594/PANGAEA.949944