Deutsch
 
Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT

Freigegeben

Zeitschriftenartikel

Petrography, Mineralogy, and Geochemistry of the Nkamouna Serpentinite: Implications for the Formation of the Cobalt-Manganese Laterite Deposit, Southeast Cameroon

Urheber*innen

Dzemua,  G. L.
External Organizations (TEMPORARY!);

/persons/resource/sgleeson

Gleeson,  S. A.
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Externe Ressourcen
Es sind keine externen Ressourcen hinterlegt
Volltexte (frei zugänglich)
Es sind keine frei zugänglichen Volltexte in GFZpublic verfügbar
Ergänzendes Material (frei zugänglich)
Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar
Zitation

Dzemua, G. L., Gleeson, S. A. (2012): Petrography, Mineralogy, and Geochemistry of the Nkamouna Serpentinite: Implications for the Formation of the Cobalt-Manganese Laterite Deposit, Southeast Cameroon. - Economic Geology, 107, 1, 25-41.
https://doi.org/10.2113/econgeo.107.1.25


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1941902
Zusammenfassung
The Nkamouna Co-Mn-Ni laterite is in advanced exploration project located in southeast Cameroon. The deposit comprises a deep and complex laterite profile with high Co (similar to 0.25 wt%) and Mn (1.33 wt %) contents, subeconomic Ni grade and a Ni:Co ratio of less than 3. This makes Nkamouna an unusual type of laterite deposit as it will be primarily mined for Co. The Co-Mn mineralization occurs it the interface between an overlying allochthonous felsic rock-sourced laterite and a lower in situ serpentinite- derived laterite. The serpentinite is massive with a nonpseudomorphic texture and consists of two genetically related phases: Serpentinite-I and Serpentinite-II. Serpentinite-I is characterized by antigorite, magnetite, quartz, ferritchromite, and magnesite, and Serpentinite-II by antigorite and magnesite. Both serpentinite types are extremely low in sulfides. Serpentinite-I is the dominant and oldest phase and was derived from a subcontimental mantle (pyroxene-rich) peridotite emplaced in die crust during the Pan-African orogeny. The Ni concentration in the serpentinite is variable (0.07-0.30%) heterogeneously distributed, partly reflecting the present dominance of pyroxenes in the protolith. However, Ni is also hosted by magnetite and ferritchromite. The differential weathering of these Ni-hosting minerlas is also responsible for the lower Ni grade of the deposit. Importantly, the serpentinite is depleted in Co and Mn and the enrichment of these cilia 0(21115 in the laterite profile suggests that these elements May be derived from an exotic source.