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Platinum-group elements in Cu-sulphide ores at Carolusberg and East Okiep, Namaqualand, South Africa

Maier, Wolfgang D. 2000. Platinum-group elements in Cu-sulphide ores at Carolusberg and East Okiep, Namaqualand, South Africa. Mineralium Deposita 35 (5) , pp. 422-429. 10.1007/s001260050253

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Abstract

Cu-sulphide ores at Carolusberg and East Okiep have Cu/Ni ratios of up to 80, an order of magnitude higher than most magmatic sulphide ores elsewhere. In contrast, Se/S ratios (500–1700 × 10−6) and PGE tenors (up to 5 ppm) of the sulphides are in the range of more typical magmatic sulphide ores. The observed metal patterns may be explained by a process of monosulphide solid solution (mss) fractionation of a magmatic sulphide melt at depth, but this model is currently considered unlikely, due to the paucity of refractory ores in the district. Assimilation of Cu-rich country rocks during ascent of the Koperberg magmas proved difficult to test with the available data, but this provides no explanation for the common high-grade metamorphic setting of similar ores elsewhere. A restitic origin of the pyroxenites appears to explain many of the observed ore features and is presently favoured here. Desulphidization of a primary magmatic sulphide ore could not have yielded the observed metal patterns and is therefore considered to be of relatively minor importance in ore genesis.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Publisher: Springer Verlag
ISSN: 0026-4598
Last Modified: 04 Jun 2017 06:08
URI: http://orca.cf.ac.uk/id/eprint/56755

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