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Geological and mineralogical study of Co-rich ferromanganese crusts from a submerged atoll in the Tuamotu Archipelago (French Polynesia)
Le Suave, R.; Pichocki-Seyfried, C.; Pautot, G.; Hoffer, M.; Morel, Y.; Voisset, M.; Monti, S.; Amossé, J.; Kosakevitch, A. (1989). Geological and mineralogical study of Co-rich ferromanganese crusts from a submerged atoll in the Tuamotu Archipelago (French Polynesia). Mar. Geol. 87(2-4): 227-247
In: Marine Geology. Elsevier: Amsterdam. ISSN 0025-3227, more
Peer reviewed article  

Available in  Authors 

Keywords
    Atolls; Authigenesis; Cobalt compounds; Ferromanganese nodules; Geochemical cycle; Geological oceanography; Geological oceanography; Sedimentology; Marine

Authors  Top 
  • Le Suave, R.
  • Pichocki-Seyfried, C.
  • Pautot, G.
  • Hoffer, M.
  • Morel, Y.
  • Voisset, M.
  • Monti, S.
  • Amossé, J.
  • Kosakevitch, A.

Abstract
    The Tuamotu Archipelago in French Polynesia is a Co-rich ferromanganese crust pronvice. The NODCO I survey (1986) provided detailed data on Co-rich crusts in this environment through the exploration of a restricted zone in the vicinity of Niau Island on the southern flnak of the archipelago. This flat zone is a fossil atoll which, under the action the action of subsidence and tectonic movements, has collapsed to a water depth of 1000 m. Outcrops of ferromanganese crusts, are located on the inner side of the coral reef which bounds the ancient lagoon. Poorly crystallized delta -MnO2) is the dominant mineralogical phase. Cobalt enrichment seems to be related to delta -MnO2 particle size. The greatest contents are located in the finest material where the particle size is less than 0.1 mu m.

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