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• W2022178895 abstract "The Dusi sapphire deposit, located in central Kenya, is a unique igneous gem-corundum deposit. Blue and yellow sapphires are recovered from a N–S vertical monzonite dyke, 4–5 m thick, extending over a few kilometres. The rock consists primarily of plagioclase (An3–9), orthoclase (Or82–96), corundum, zircon and Fe-mica. The colour of corundum is attributed to Fe3+, Fe2+/Fe3+, and Fe2+/Ti4+ charge transfers. Zircons are mostly of the S11 type of Pupin [Contribut. Mineral. Petrol. 73 (1980) 207], and contain significant traces of Hf (4000–10,000 ppm). The mineralogical and chemical characteristics of this rock are unique. U–Pb geochronology on zircon crystals allows to date the crystallisation of the dyke at 579 ±6 Ma, that is during the Barsaloian episode [Precambrian Res. 44 (1989) 197] of the Mozambique Belt in Kenya. Sr–Nd isotopic data indicate that the rock is of mantle origin, with little or no participation of a crustal component. In many respects, the Dusi corundum crystals are comparable to corundum xenocrysts originating from alkali basalt fields, possibly due to a similar crystallisation environment." @default.
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• W2022178895 date "2004-03-01" @default.
• W2022178895 modified "2023-10-05" @default.
• W2022178895 title "The Dusi (Garba Tula) sapphire deposit, Central Kenya––a unique Pan-African corundum-bearing monzonite" @default.
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• W2022178895 doi "https://doi.org/10.1016/j.jafrearsci.2004.02.002" @default.
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