Nickel and cobalt distribution in the laterites of the Lomié region, south-east Cameroon

Cobalt-rich lithiophorite from the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India

“…Cobalt in manganese shows a good correlation with manganese. A similar correlation has been reported from the laterites of the Lomie region, south-east Cameroon (Yongue-Fouateu et al 2006). Lithiophorite is the main contributor of cobalt as the bulk manganese ores contain very small amounts.…”

Understanding the genesis of ultramafic soils and catena dynamics in Niquelândia, Brazil

“…They resemble to other highly weathered soils developed under humid tropical climate Yongue-Fouateu et al, 2006), confirming that they have been affected by intensive chemical weathering. During the early stage of weathering (see above), smectites may form and incorporate the Cr released during primary minerals weathering.…”

Mobilization and redistribution of major and trace elements in two weathering profiles developed on serpentinites in the Lomié ultramafic complex, South-East Cameroon

“…The weathering of serpentinites (in the South-East part of the basement) has led to secondary mineralization dominated by chlorites, smectites, talc, goethite, maghemite, hematite, kaolinite and gibbsite (Yongué-Fouateu et al, 2006). This weathering has also liberated some chemical elements that show various types of behaviour in the weathering profile.…”

“…For example, Yongué-Fouateu et al (2006) showed that highest concentrations of nickel and cobalt are located in the saprolite zone. In contrast, weathering mobilises uranium through dissolution of primary minerals from the coarse saprolite whereas thorium precipitates in situ (Moreira-Nordemann and Sieffermann, 1979).…”