The oxide minerals of the Wesselton mine kimberlite, Kimberley, South Africa

S. R. Shee

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22 Citations (Scopus)


The compositions of the constituent spinels, ilmenites, rutiles and perovskites have been determined in six kimberlite intrusions at Wesselton. Groundmass spinels show a normal magmatic trend of Cr-rich, Ti-poor chromite cores and Ti-rich, Cr-poor titanomagnetite rims. Spinels from peridotite xenoliths are compositionally distinct from groundmass spinels. Ilmenites occur as: 1) macrocrysts; 2) in metasomatized peridotites; 3) as inclusions in olivine phenocrysts; and 4) as groundmass grains in the kimberlite. Despite some overlap they can be distinguished compositionally. The origin and crystallization sequence of oxide minerals at Wesselton is pre-intrusion: chromite (xenocrysts), rutile macrocrysts (xenocrysts), ilmenite macrocrysts (phenocrysts or xenocrysts?), groundmass chromite, rutile and ilmenite inclusions in olivine phenocrysts, groundmass ilmenite (microphenocrysts); and post-intrusion: groundmass titanomagnetites, perovskites and magnetites (microphenocrysts). -J.M.H.

Original languageEnglish
Pages (from-to)59-73
Number of pages15
JournalAmerican Society of Mechanical Engineers (Paper)
Publication statusPublished - 1984
Externally publishedYes


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