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doi:10.1595/147106709X480913
•Platinum Metals Rev., 2010, 54, (1)•
28º45’E
23º30’S
23º45’S
Overysel 0 10 km
Zwartfontein South pit
24º00’S
Sandsloot pit
Turfspruit
24º15’S
Ysterberg-Planknek fault
29º00’E
0 100 km
Bushveld
Complex
MOKOPANE
Johannesburg
Waterberg and Karoo cover
Bushveld acid phase
Rustenburg Layered Suite
Bushveld Marginal Zone
Transvaal Supergroup
Archaean basement
Bushveld Complex
Upper Zone
Main Zone
Platreef
Lower Zone
Transvaal Supergroup
Timeball Hill Formation
Duitschland Formation
Penge Formation
Malmani Subgroup
Archaean basement
enlarged
area
granite/gneiss complex
preserved along strike.They subsequently
undertook a LA-ICP-MS investigation
of these ‘primary’ sulfides, such as those
shown in Figure 3 (25). Some of the LA-
ICP-MS results of pyrrhotite, pentlandite
and chalcopyrite from this study are
shown as TRA spectra in Figure 4.
Figure 4(a) shows a TRA spectrum for
a pyrrhotite grain from the Platreef
pyroxenites, with smooth, parallel patterns
of Ir, Os and Ru with sulfur, indicating
that the IPGEs are present in solid
solution in the pyrrhotite. Pentlandite
was also found to contain concentrations
of the IPGEs. In contrast though,
pentlandite is the major carrier of Pd
and Rh. Concentrations of Pd and Rh
within individual pentlandite crystals
are quite variable and high Rh contents
do not necessarily correlate with high
Pd contents. Some minor Pt (