 | | Journal (article/letter/editorial) | | lanthanide mineralization at the Buru carbonatite centre, Western Kenya I. O. ONUONGA1,* AND P. BOWDEN2...France 2 ABSTR ACT The Tertiary (22 Ma) carbonatite centre at Buru hill is located towards the eastern end...rift, western Kenya. As revealed by geochemistry and petrology of drill core samples, the Buru centre ranges...the lateritic cover of the Buru carbonatite centre is characterized by goethite, hematite, psilomelane,...three of the Buru drill cores reveal significant deviations from primary igneous carbonatite values suggesting |  | Giovannini, Arthur L., Bastos Neto, Artur C., Porto, Claudio G., Pereira, Vitor P., Takehara, Lucy, Barbanson, Luc, Bastos, Pedro H.S. (2017) Mineralogy and geochemistry of laterites from the Morro dos Seis Lagos Nb (Ti, REE) deposit (Amazonas, Brazil) Ore Geology Reviews, 88. 461-480 doi:10.1016/j.oregeorev.2017.05.008 | Journal (article/letter/editorial) | | laterites formed by the weathering of siderite carbonatite. This iron-rich lateritic profile (>100 m in...laterite. All the laterites are composed mainly of goethite (predominant in the lower and upper varieties)...formed from goethite dehydroxylation). The upper laterites were reworked, resulting in goethite formation...(last pyrochore before final breakdown), Nb-rich goethite and minor cerianite. The paragenesis results of...concentrated to potentially economic levels in carbonatite and alkali-silicate igneous rocks and their weathering |
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