Variations in the nature of the platinum-group minerals in a cross-section through the Merensky reef at impala platinum: Implications for the mode of formation of the reef

Canadian Mineralogist

Volumn 42, Issue 2, 2004, Pages 423-437

  Prichard, Hazel M ^a   Barnes, Sarah Jane ^b   Maier, Wolfgang D ^c   Fisher, Peter C ^a  

^a CARDIFF UNIVERSITY   (United Kingdom)

^b UNIVERSITÉ DU QUÉBEC À CHICOUTIMI   (Canada)

^c UNIVERSITY OF PRETORIA   (South Africa)

Author keywords

Bushveld Complex; Chromitite; Impala Platinum mine; Merensky Reef; Platinum group minerals; South Africa; Sulfide; Telluride

Indexed keywords

COMPOSITION; CRYSTALLIZATION; LITHOLOGY; PLATINUM; REEFS; RHODIUM; SILICATES;

LEUCONORITE; MELANORITE;

MINERALOGY;

CHEMICAL COMPOSITION; METALLOGENESIS; MINERALOGY; ORE BODY; OVERPRINTING; PLATINUM GROUP ELEMENT; SPATIAL DISTRIBUTION;

AFRICA; BUSHVELD COMPLEX; MERENSKY REEF; SOUTH AFRICA; SOUTHERN AFRICA; SUB-SAHARAN AFRICA;

EID: 3142667861     PISSN: 00084476     EISSN: None     Source Type: Journal    
DOI: 10.2113/gscanmin.42.2.423     Document Type: Article

References (44)

1. ANDREWS, D.R.A. & BRENAN, J.M. (2002): The solubility of ruthenium in sulfide liquid; implications for platinum group mineral stability and sulfide melt - silicate melt partitioning. Chem. Geol. 192, 163-181.
2. BALLHAUS, C. & RYAN, C.G. (1995): Platinum-group elements in the Merensky Reef. I. PGE in solid solution in the base-metal sulfides and down temperature equilibration history of Merensky ores. Contrib. Mineral. Petrol. 122, 241-251.
3. BARNES, S.-J. & MAIER, W.D. (2002): Platinum-group elements and microstructures of normal Merensky Reef from Impala Platinum mines, Bushveld complex. J. Petrol. 43, 103-128.
4. BARNES, S.-J., MAIER, W.D. & ASHWAL, L. (2004): The distribution of the platinum-group elements in the Main and Upper zones of the Bushveld Complex. Chem. Geol. (in press).
5. BARNES, S.-J., MAKOVICKY, E., KARUP-MØLLER, S., MAKOVICKY, M. & ROSE-HANSON, J. (1997): Partition coefficients for Ni, Cu, Pd, Pt, Rh and Ir between monosulfide solution and sulfide liquid and the implications for the formation of compositionally zoned Ni-Cu sulfide bodies by fractional crystallization of sulfide liquid. Can. J. Earth Sci. 34, 366-374.
6. BARNES, S.-J., VAN ACHTERBERGH, E., MAKOVICKY, E. & LI, CHUSI (2001): Proton microprobe results for the partitioning of platinum-group elements between monosulfide solid solution and sulfide liquid. S. Afr. J. Geol. 104, 275-286.
7. BORISOV, A. & PALME M.H. (2000): Solubility of noble metals in Fe-containing silicate melts as derived from experiments in Fe-free systems. Am. Mineral. 85, 1665-1673.
8. BOUDREAU, A.E., MATHEZ, E.A. & MCCALLUM, I.S. (1986): Halogen geochemistry of the Stillwater and Bushveld complexes: evidence for the transport of the platinum-group elements by Cl-rich fluids. J. Petrol. 27, 967-986.
9. BRENAN, J.M. & ANDREWS, D. (2001): High-temperature stability of laurite and Ru-Os-Ir alloy and their role in PGE fractionation in mafic magmas. Can. Mineral. 39, 341-360.
10. BRYNARD, H.J., DE VILLIERS, J.P.R. & VILJOEN, E.A. (1976): A mineralogical investigation of the Merensky Reef at the Western Platinum mine, near Marikana, South Africa. Econ. Geol. 71, 1299-1307.
11. CAMPBELL, I.H., NALDRETT, A.J. & BARNES S.J. (1983): A model for the origin of the platinum rich sulfide horizons in the Bushveld and Stillwater complexes. J. Petrol. 24, 133-165.
12. CAWTHORN, R.G., LEE, C.A., SCHOUWSTRA, R.P. & MELLOWSHIP, P. (2002b): Relationship between PGE and PGM in the Bushveld Complex. Can. Mineral. 40, 311-328.
13. CAWTHORN, R.G., MERKLE, R.K.W. & VILJOEN, M.J. (2002a): Platinum-group element deposits in the Bushveld Complex, South Africa. In The Geology, Geochemistry, Mineralogy and Mineral Beneficiation of Platinum-Group Elements (L.J. Cabri, ed.). Can. Inst. Mining Metall. Petroleum, Spec. Vol. 54, 389-430.
14. HIEMSTRA, S.A. (1979): The role of collectors in the formation of the platinum deposits of the Bushveld Complex. Can. Mineral. 17, 469-482.
15. HOFFMAN, E. & MACLEAN, W.H. (1976): Phase relations of michenerite and merenskyite in the Pd-Bi-Te system. Econ. Geol. 71, 1461-1468.
16. KARUP-MØLLER, S. & MAKOVICKY, E. (2002): The system Fe-Os-S at 1180, 1100, and 900°C. Can. Mineral. 40, 499-507.
17. KINLOCH, E.D. (1982): Regional trends in the platinum-group mineralogy of the Critical Zone of the Bushveld Complex, South Africa. Econ. Geol. 85, 1328-1347.
18. KINLOCH, E.D. & PEYERL, W. (1990): Platinum-group minerals in various rock types of the Merensky Reef: genetic implications. Econ. Geol. 85, 537-555.
19. LEE, C.A. (1996): A review of mineralization in the Bushveld Complex and some other layered intrusions. In Layered Intrusions (R.G. Cawthorn, ed.). Elsevier, Amsterdam, The Netherlands (103-145).
20. LEE, C.A. & TREDOUX, M. (1986): Platinum-group element abundances in the Lower and the Lower Critical Zones of the Eastern Bushveld Complex. Econ. Geol. 81, 1087-1095.
21. MAIER, W.D., PRICHARD, H.M., BARNES, S.-J. & FISHER, P.C. (1999): Compositional variation of laurite at Union Section in the Western Bushveld Complex. S. Afr. J. Geol. 102, 286-292.
22. MAJZLAN, J., MAKOVICKY, M., MAKOVICKY, E. & ROSE-HANSEN, J. (2002): The system Fe-Pt-S at 1100°C. Can. Mineral. 40, 509-517.
23. MAKOVICKY, M., MAKOVICKY, E. & ROSE-HANSEN, J. (1986): Experimental studies on the solubility and distribution of platinum-group elements in base-metal sulfides in platinum deposits. In Metallogeny of Basic and Ultrabasic Rocks (M.J. Gallagher, R.A. Ixer, C.R. Neary & H.M. Prichard, eds.). Institute of Mining and Metallurgy, London, U.K. (415-425).
24. MATHEZ, E.A. (1995): Magmatic metasomatism and formation of the Merensky Reef, Bushveld complex. Contrib. Mineral. Petrol. 119, 277-286.
25. MATHEZ, E.A. (1999): On factors controlling the concentrations of platinum-group elements in layered intrusions and chromitites. In Dynamic Processes in Magmatic Ore Deposits and Their Application in Mineral Exploration (R.R. Keays, ed.). Geol. Assoc. Can., Short Course Notes 13, 251-285.
26. MATHEZ, E.A., HUNTER, R.H. & KINZLER, R. (1997): Petrologic evolution of partially molten cumulus: the Atok section of the Bushveld Complex. Contrib. Mineral. Petrol. 129, 20-34.
27. MAVROGENES, J.A. & O'NEILL, H.ST. C. (1999): The relative effects of pressure, temperature and oxygen fugacity on the solubility of sulfide in mafic magmas. Geochem. Cosmochim. Acta 63, 1173-1180.
28. MERKLE, R.K.W. (1992): Platinum-group minerals in the middle group of chromitite layers at Marikana, western Bushveld Complex: indications for collection mechanisms and postmagmatic modification. Can. J. Earth Sci. 29, 209-221.
29. MERKLE, R.K.W. & MCKENZIE, A.D. (2002): The mining and beneficiation of South African PGE ores-an overview. In The Geology, Geochemistry, Mineralogy and Mineral Beneficiation of Platinum-Group Elements (L.J Cabri, ed.). Can. Inst. Mining Metall. Petroleum, Spec. Vol. 54, 793-811.
30. MOSTERT, A.B., HOFMEYR, P.K. & POTGIETER, G.A. (1982): The platinum-group mineralogy of the Merensky Reef at Impala Platinum mines, Bophuthatswana, Econ. Geol. 77, 1385-1394.
31. NALDRETT, A.J. & LEHMANN, J. (1988): Spinel non-stoichiometry as the explanation for Ni-, Cu- and PGE enriched sulfides in chromitites. In The Geo-Platinum Symposium Volume (H.M. Prichard, P.J. Potts, J.F.W. Bowles & S.J. Cribb, eds.). Elsevier, London, U.K. (93-103).
32. NICHOLSON, D.M. & MATHEZ, E.A. (1991): Petrogenesis of the Merensky Reef in the Rustenburg section of the Bushveld Complex. Contrib. Mineral. Petrol. 107, 293-309.
33. OHNENSTETTER, M., JOHAN, Z., COCHERIE, A., FOUILLAC, A.M., GUERROT, C., OHNENSTETTER, D., CHAUSSIDON, M., ROUER, O., MAKOVICKY, E., MAKOVICKY, M., ROSE-HANSEN, J., KARUP-MØLLER, S., VAUGHAN, D., TURNER, G., PATTRICK, R.A.D., GIZE, A.P., LYON, I. & MCDONALD, I. (1999): New exploration methods for Pt and Rh deposits poor in base-metal sulfides - NEXTPRIM. Trans. Inst. Mining Metall. B108, 119-150.
34. th Int. Platinum Symp., Extended Abstr. (A. Boudreau, ed.), 363-366.
35. SCOON, R.N. & TEIGLER, B. (1994): Platinum-group element mineralization in the Critical Zone of the Western Bushveld Complex. I. Sulfide poor chromitites below the UG2. Econ. Geol. 89, 1094-1121.
36. SHARPE, M.R., BAHAT, D. & VON GRUENEWALDT, G. (1981): The concentric elliptical structure of feeder sites to the Bushveld Complex and the possible economic implications. Trans. Geol. Soc. S. Afr. 84, 239-244.
37. VERMAAK, C.F. (1976): The Merensky Reef - thoughts on its environment and genesis. Econ. Geol. 71, 1270-1298.
38. VERMAAK, C.F. & HENDRICKS, L.P. (1976): A review of the mineralogy of the Merensky Reef, with specific reference to new data on the precious metal mineralogy. Econ. Geol. 71, 1244-1269.
39. VERRYN, S.M.C. & MERKLE, R.K.W. (2002): The system PtS-PdS-NiS between 1200°C and 700°C. Can. Mineral. 40, 571-584.
40. VILJOEN, M.J. & SCHURMANN, L.W. (1998): Platinum-group metals. In the Mineral Resources of South Africa (M.G.C. Wilson & C.R. Anhaeusser, eds.). Council for Geoscience, Pretoria, South Africa (532-568).
41. VON GRUENEWALDT, G., HATTON, C.J., MERKLE, R.K.W. & GAIN, S.B. (1986 : Platinum-group element chromitite associations in the Bushveld Complex. Econ. Geol. 81, 1067-1079.
42. VON GRUENEWALDT, G., HULRERT, L.J. & NALDRETT, A.J. (1989): Contrasting platinum-group element concentration patterns in cumulates of the Bushveld Complex. Mineral, Deposita 24, 219-229.
43. WENDTLAND, R.F. (1982): Sulfide saturation of basalt and andesite melts. Am. Mineral. 67, 877-885.
44. WILLMORE, C.C., BOUDREAU, A.E. & KRUGER, J.F. (2000): The halogen geochemistry of the Bushveld Complex. Republic of South Africa: implications for chalcophile element distribution in the Lower and Critical zones. J. Petrol. 41, 1517-1539.