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Downdip development of the Ni‐Cu‐PGE‐bearing mafic to ultramafic uitkomst complex, Mpumalanga province, South Africa

Gauert, Christoph; Zeh, Armin


The about 2055-Ma-old mafic to ultramafic Uitkomst Complex in the Mpumalanga Province of South Africa hosts the low-grade-large-tonnage Ni-Cu-PGE deposit, Nkomati. The complex is regarded to represent a satellite to the Bushveld Complex and a feeder to an eroded magmatic reservoir in the southeast. Aeromagnetic surveys and previous drilling indicated an overall northwestern-downdip extension of the complex, but the question is to what extent and in which expression can the complete intrusion be found under cover in the northwest? Answering this, a mineralogical, geochemical and geochronological investigation of a borehole intersection of the whole complex at Little Mamre was carried out, using petrography, XRF, EPMA and LA-ICP-MS U–Pb analyses of zircons for age determination. Although the total thickness of the rock units is larger than to the southeast, emplacement, litho- and mineral chemistry trends, expression of alteration mineralogy and style of sulphide mineralisation are similar. The amount of sulphide mineralisation is on average less than in the southeast. The upper ultramafic unit contains, more frequently, pegmatoidal sections, and the Chromitiferous Harzburgite unit has less massive chromitite layers than the southeastern parts of the complex, whereas the gabbro(-norite) units contain more interstitial liquid with late-stage minerals. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000141715
Veröffentlicht am 10.01.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2075-163X
KITopen-ID: 1000141715
Erschienen in Minerals
Verlag MDPI
Band 12
Heft 1
Seiten 22
Schlagwörter Uitkomst Complex; Nkomati Nickel; South Africa; Ni-Cu-PGE-Co-Cr mineralization; downdip development; Bushveld Complex age
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