Geology and Geochemistry of Bauxite Deposits in Lushoto District, Usambara Mountains, Tanzania

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dc.contributor.authorMutakyahwa, M. K. D.
dc.contributor.authorIkingura, Justinian R.
dc.contributor.authorMruma, Abdulkarim H.
dc.date.accessioned2016-09-21T17:08:42Z
dc.date.available2016-09-21T17:08:42Z
dc.date.issued2003
dc.descriptionFull text can be accessed at http://www.sciencedirect.com/science/article/pii/S0899536203000423en_US
dc.description.abstractBauxite deposits in the Usambara Mountains of north eastern Tanzania occur as remnants of residual deposits on two geomorphologically related plateaus of Mabughai-Mlomboza and Kidundai at Magamba in Lushoto, Usambara Mountains. The parent rocks for the deposits are mainly granulites and feldspathic gneisses of Neoproterozoic Mozambique belt. The plateaus represent a preserved Late Cretaceous–Lower Tertiary old land surface (African surface). Other parts of the Usambara Mountains and the neighbouring Pare Mountains are covered mostly by red–brown lateritic soils and impure reddish-brown kaolinitic clays. The bauxite deposits contain mainly Al2O3 (40–69 wt.%), Fe2O3 (3–10 wt.%), SiO2 (0.16–7 wt.%) and other elements occur in quantities not substantial to affect the quality or processing of the bauxite, and are attributed to the presence of relic minerals. Gibbsite makes up to 98 vol.% of the bauxite ore in special cases. Gibbsite is accompanied by goethite in the ore. Boehmite occurs in small amounts and is usually accompanied by hematite. Impurities include goethite, hematite, kaolinite, and minor relic quartz and microcline. Kaolinite is the sole clay mineral encountered in the bauxite ore, suggesting mature soil profiles and a development of the bauxite deposits on a well-drained peneplanation. Ore reserve estimates from the drilling data and surface geological mapping of the deposits yielded bauxite reserves of about 37 million tonnes.en_US
dc.identifier.citationMutakyahwa, M.K.D., Ikingura, J.R. and Mruma, A.H., 2003. Geology and geochemistry of bauxite deposits in Lushoto District, Usambara Mountains, Tanzania. Journal of African Earth Sciences, 36(4), pp.357-369.en_US
dc.identifier.doi10.1016/S0899-5362(03)00042-3
dc.identifier.urihttp://hdl.handle.net/20.500.11810/4115
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectBauxiteen_US
dc.subjectSaproliteen_US
dc.subjectGibbsiteen_US
dc.subjectRelic mineralsen_US
dc.subjectOld land surfacesen_US
dc.titleGeology and Geochemistry of Bauxite Deposits in Lushoto District, Usambara Mountains, Tanzaniaen_US
dc.typeJournal Article, Peer Revieweden_US
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