 | | Journal (article/letter/editorial) | | Petrography, Mineralogy, and Geochemistry of the Nkamouna Serpentinite: Implications for the Formation of...the Cobalt-Manganese Laterite Deposit, Southeast Cameroon GIDEON LAMBIV DZEMUA† AND SARAH A. GLEESON Department...The Nkamouna Co-Mn-Ni laterite is an advanced exploration project located in southeast Cameroon. The...The deposit comprises a deep and complex laterite profile with high Co (~0.25 wt %) and Mn (1.33 wt %) contents...grade and a Ni:Co ratio of less than 3. This makes Nkamouna an unusual type of laterite deposit as it will |  | | Journal (article/letter/editorial) | | Mineralogical characterization of the Nkamouna Co–Mn laterite ore, southeast Cameroon G. Lambiv Dzemua & S. A. Gleeson...June 2012 # Springer-Verlag 2012 Abstract The Nkamouna property is an oxide laterite deposit developed...developed on serpentinized peridotite in southeast Cameroon. It is enriched in Co and Mn, has sub-economic Ni...Museum, London SW7 5BD, UK lithiophorite makes Nkamouna ore amenable to physical beneficiation, producing...higher than the run-of-mine ore. Keywords Asbolane . Lithiophorite . Nkamouna . Cameroon . Cobalt laterite |  | Yongue–Fouateu, R., Yemefack, M., Wouatong, A. S. L., Ndjigui, P. D., Bilong, P. (2009) Contrasted mineralogical composition of the laterite cover on serpentinites of Nkamouna-Kongo, southeast Cameroon. Clay Minerals, 44 (2) 221-237 doi:10.1180/claymin.2009.044.2.221 | Journal (article/letter/editorial) | | laterite cover on serpentinites of Nkamouna-Kongo, southeast Cameroon R. YONGUE FOUATEU1,*, M. YEMEFACK2...University of Yaoundé I, PO Box 812 Yaoundé, Cameroon, Institute of Agricultural Research for Development...Development (IRAD), PO Box 2067 Yaoundé, Cameroon, 3 Department of Earth Sciences, Faculty of Science, University...University of Dschang , PO Box 67, Dschang, Cameroon, 4 Department of Earth Sciences, Faculty of Science...Science, University of Douala, PO Box 24157 Douala, Cameroon 2 (Received 11 November 2007; revised 17 December |  | | Journal (article/letter/editorial) | | Ni deposits are rare and their identification in complex. Their geology and petrogenesis has not been well...geometric re-arrangement, intrusion related events and complex metamorphic histories), conceptually, ophiolitic...nickel are exploration targets elsewhere in the region (e.g., Wowo Gap, lateritic nickel, 120 Mt at 1...the KFZ are steeply dipping to vertical in the region. North of the KFZ, a diverse sequence of Jurassic–Cretaceous...serpentine group minerals (chrysotile, and possibly antigorite) and Fe oxides, both in the form of “limonite” |  | | Journal (article/letter/editorial) | | mantle sequence (the Semail ophiolite) onto the East Arabian margin during the late Cretaceous. The laterites... Ni concentrations average 0.63% (Ibra), 0.72% (East Ibra), 0.67% (Al-Russayl), and 0.33% (Tiwi). Other...Al-Khirbash (2015) concluding that the Ibra and East Ibra laterites are of the silicate type, while that...(1998). To attain a better understanding of the complex processes involved in laterite formation and the...study belonged to four separate areas, namely Ibra, East Ibra, Tiwi, and Al-Russayl. The Ibra profile is located |  | | Journal (article/letter/editorial) | | mantle sequence (the Semail ophiolite) onto the East Arabian margin during the Late Cretaceous. The laterites...concentrations average 0.63% (Ibra), 0.72% (3 profiles, East Ibra), 0.67% (3 profiles, Al-Russayl), and 0.33%...Ni-bearing minerals. This study showed that the Ibra, East Ibra and Tiwi laterites are similar to the other...chlorite, and serpentine (nepouite, chrysotile, and antigorite) are the main constituents. Al-Russayl laterite...development of the laterites in the Oman Mountain region has been given in Lippard et al. (1986), Skelton |  | | Journal (article/letter/editorial) | | Serpentinites are formed by hydrothermal metamorphism of ultramafic rocks such as peridotites and pyroxenites. During...During the metamorphism, the anhydrous ultramafic rocks become more hydrous and Ca content decreases,...Serpentine is the name of a class of minerals of which antigorite, lizardite, and chrysotile are the most recognized...the world’s rice-growing area occurring in this region (Kyuma, 2004). Serpentinitic landscapes are found...Central Ridge to the west and the Coastal Range to the east. Clays and Clay Minerals The soils’ parent materials |  | Dybowska, Agnieszka, Schofield, Paul, Newsome, Laura, Herrington, Richard, Mosselmans, Julian, Kaulich, Burkhard, Kazemian, Majid, Araki, Tohru, Skiggs, Thomas, Kruger, Jens, Oxley, Anne, Norman, Rachel, Lloyd, Jonathan (2022) Evolution of the Piauí Laterite, Brazil: Mineralogical, Geochemical and Geomicrobiological Mechanisms for Cobalt and Nickel Enrichment. Minerals, 12 (10) 1298 doi:10.3390/min12101298 | Journal (article/letter/editorial) | | are associated with both the original intrusive complex and also the nature of fluid flow, redox cycling...environments through extensive weathering of ultramafic rocks. Variations in climate, weathering and...Kazakhstan, Russia, Turkey, Greece, and the Balkan region of Europe e.g., [11,14,16], and these deposits...after [24]. (B) A geological map of the Brejo Seco Complex with the location of the Piauí deposit shown by...mafic-ultramafic Brejo Seco– Piauí Complex in the São Francisco craton [20,24,25]. The complex is bound |  | Dublet, Gabrielle, Juillot, Farid, Morin, Guillaume, Fritsch, Emmanuel, Fandeur, Dik, Ona-Nguema, Georges, Brown, Gordon E. (2012) Ni speciation in a New Caledonian lateritic regolith: A quantitative X-ray absorption spectroscopy investigation. Geochimica et Cosmochimica Acta, 95. 119-133 doi:10.1016/j.gca.2012.07.030 | Journal (article/letter/editorial) | | in the saprolite. In the Philippines (ophiolite complex on the Pujada Peninsula), the recent EXAFS study...serpentine phases, lizardite, chrysotile, and antigorite were previously identified by TEM analysis in...arsenic(V), iron(III) gels in the Carnoulès Acid Mine Drainage, France. A XANES, XRD, and SEM Study. Environ...(1999) Quantitative speciation of lead in selected mine tailings from Leadville, CO. Environ. Sci. Technol...laterite cover on serpentinites of Nkamouna Kongo, southeast Cameroon. Clay Miner. 44(2), 221–237. Associate |
|
