 | | 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 |  | 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 |  | Van Cromphaut, C., Van Ranst, E., De Resende, V. G., Vandenberghe, R. E., De Grave, E., Lambiv Dzemua, G. (2008) Characterization by Mössbauer spectroscopy of Fe phases in highly weathered serpentinitic soil from southern Cameroon. Clay Minerals, 43 (1) 117-128 doi:10.1180/claymin.2008.043.1.09 | Journal (article/letter/editorial) | | highly weathered serpentinitic soil from southern Cameroon C. VAN CROMPHAUT1,*, E. VAN RANST2, V. G. DE RESENDE1...Ghent, Belgium, and 3 Geovic Cameroon PLC, BP 11555, Yaounde, Cameroon 2 (Received 1 April 2007; revised...serpentinized ultrabasic intrusive rocks of southern Cameroon has received considerable attention from mining...pedimentation. KEYWORDS: serpentinitic soil, Cameroon, Mössbauer spectroscopy, X-ray diffraction. ...(Yerima & Van Ranst, 2005). The Precambrian rocks of Cameroon have classically been divided into two major groups: |  | Domènech, Cristina, Galí, Salvador, Villanova-de-Benavent, Cristina, Soler, Josep M., Proenza, Joaquín A. (2017) Reactive transport model of the formation of oxide-type Ni-laterite profiles (Punta Gorda, Moa Bay, Cuba) Mineralium Deposita, 52 (7) 993-1010 doi:10.1007/s00126-017-0713-0 | Journal (article/letter/editorial) | | from the chemical and mechanical weathering of ultramafic rocks exposed to the surface under favorable...(a) partially or totally 994 serpentinized ultramafic rock (protolith) characterized by unweathered...interaction of slightly acidic meteoric water with the ultramafic bedrock causes the release of Mg, Si, and Ni...silicate mineral as a sink for atmospheric CO2(g). Magnesite deposits associated to serpentine bodies have...Ulrich et al. 2014; Quesnel et al. 2016). However, magnesite precipitation, although thermodynamically stable |  | Brinza, Loredana, Quinn, Paul D., Schofield, Paul F., Mosselmans, J. Frederick W., Hodson, Mark E. (2013) Incorporation of strontium in earthworm-secreted calcium carbonate granules produced in strontium-amended and strontium-bearing soil. Geochimica et Cosmochimica Acta, 113. 21-37 doi:10.1016/j.gca.2013.03.011 | Journal (article/letter/editorial) | | different species kept in soils collected from the Yate region by Morgan et al. (2001, 2002) but Ca concentrations...calcitic in nature. Small differences in the post-edge region of these spectra exist, specifically in the shape...indicative of vaterite. The difference in the pre-edge region between the two polymorphs is clearly shown in...distribution of atoms about the Ca in vaterite is more complex than that of calcite. The “standard” crystallographic...Zemann J. (1981) Crystal structure refinements of magnesite, calcite, rhodochrosite, siderite, smithonite |
|
