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Applied Earth Science
Transactions of the Institutions of Mining and Metallurgy: Section B
Volume 111, 2002 - Issue 1
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Articles

Chromitite formation—a key to understanding processes of platinum enrichment

Pages 23-35 | Published online: 18 Jul 2013

References

  • Balhaus C. G. and Stumpfl E. F. Sulphide and platinum miner-alization in the Merensky Reef: evidence from hydrous silicates and fluid inclusions. Contr. Mineral. Petrol., 94, 1986,193–204.
  • Balhaus C. G. and Sylvester P. Noble metal enrichment in the Merensky Reef, Bushveld Complex. J. Petrology, 41, 2000,545–61.
  • Barnard, Jacobs and Mellet. South African platinum mines and mineralization, 1:300 000 scale map. (Marshalltown: Barnard, Jacobs and Mellet, 2000).
  • Barton J. M., Cawthorn R. G. and White J. The role of contami-nation in the evolution of the Platreef of the Bushveld Complex. Econ. Geol., 81, 1986,1096–104.
  • Boudreau A. E. Some geochemical considerations of platinum-group element exploration in layered intrusions. Explor. Min. Geol., 4, 1995,215–25.
  • Boudreau A. E. and McCallum I. S. Infiltration metasomatism in layered intrusions. An example from the Stillwater Complex, Montana. J. volcan. geothermal Res., 52, 1992,171–83.
  • Boudreau A. E. and Meurer W. P. Chromatographic separation of the platinum-group elements, gold, base metals and sulphur dur-ing degassing of a compacted and solidifying igneous crystal pile. Contrib. Mineral. Petrol., 134, 1999,174–85.
  • Buchanan D. L. Platinum-group element exploration (Amsterdam: Elsevier, 1988), 184 p. Developments in Economic Geology 26
  • Buchanan D. L., and Rouse J. E. Role of contamination in the precipitation of sulphides in the Platreef of the Bushveld Complex. In Buchanan D. L. and Jones M. J. eds Sulphide deposits in mafic and ultramafic rocks (London: IMM, 1984), 141–6.
  • Buchanan D. L. et al. The genesis of sulfide mineralization in a portion of the Potgietersrus limb of the Bushveld Complex. Econ. GeoL , 76, 1981,568–79.
  • Cameron E. N. Chromite in the central sector, eastern Bushveld Complex, South Africa. Am. Miner., 62, 1977,1082–96.
  • Cameron E. N. and Desborough G. A. Occurrence and charac-teristics of chromite deposits—eastern Bushveld Complex. Monogr. Econ. Geol. 4,1969,23–40.
  • Campbell I. H. Naldrett A. J. and Barnes S. J. A model for the origin of the platinum sulfide horizons in the Bushveld and Stillwater Complexes. J. Petrology, 24, 1983,133–65.
  • Capobianco C. J., Hervig R. L. and Drake M. J. Experiments on crystallinity and partitioning of Ru, Rh and Pd into magnetite and hematite solid solution crystallized from silicate melts. Chem. GeoL , 113, 1994,23–43.
  • Carr H. W. et al. The petrogenesis of Merensky Reef potholes at the Western Platinum mine, Bushveld Complex: Sr-isotopic evi-dence for synmagmatic deformation. Mineral. Deposita, 34, 1999, 335–47.
  • Cawthorn R. G. Controls on platinum mineralization in the Bushveld Complex. Paper presented at 8th International platinum symposium, South Africa, 28 June-3 July, 1997.
  • Cawthorn R. G. Platinum-group element mineralization in the Bushveld Complex—a critical reassessment of geochemical models. S. Afr. J. Geol., 102, 1999,268–81.
  • Cawthorn R. G. Magma mixing models for Merensky-style mineralization: the fallacy of binary diagrams. Econ. Geol., in press.
  • Cawthorn R. G. and Walraven F. Emplacement and crystalliza-tion time for the Bushveld Complex. J. Petrology, 39, 1998.1669–87.
  • Cawthorn R. G. and Webb S. J. Connectivity between the western and eastern limbs of the Bushveld Complex. Tectonophys., 330, 2001,195–209.
  • Cawthorn R. G., Barton J. M. and Viljoen M. J. Interaction of floor rocks with the Platreef on Overysel, Potgietersrus, northern Transvaal. Econ. Geol., 80, 1985,988–1006.
  • Cousins C. A. and Feringa G. The chromite deposits of the western belt of the Bushveld Complex. In Haughton S. H. ed. The geology of some ore deposits in southern Africa. Spec. PubL Geol. Soc. S. Afr., 2, 1964,183–202.
  • Eales H. V. Implications of the chromium budget of the Western Limb of the Bushveld Complex. S. Afr. J. Geol., 103, 2000, 141–50.
  • Eales H. V. and Reynolds I. M. Cryptic variation within chromitites of the upper Critical Zone, northwestern Bushveld Complex. Econ. Geol., 81, 1986,1056–66.
  • Eales H. V. and Cawthorn R. G. The Bushveld Complex. In Cawthorn R. G. ed. Layered intrusions (Amsterdam: Elsevier, 1996), 531 p. Develop. Petrol. 15
  • Eales H. V., de Klerk W. J. and Teigler B. Evidence for magma mixing processes within the Critical and Lower Zones of the north-western Bushveld Complex, South Africa. Chem. Geol., 88, 1990, 261–78.
  • Eales H. V. et al. The cyclic unit beneath the UG1 chromitite (UG1 FAX7 unit) at RPM Union Section platinum mine—Rosetta Stone of the Bushveld Upper Critical Zone. Mineralog. Mag., 54, 1990,23–43.
  • Hall A. L. and Humphrey W. A. On the occurrence of chromite along the southern and eastern margins of the Bushveld plutonic complex. Trans. geol. Soc. S. Afr., 11, 1908,69–77.
  • Hamilton P. J. Sr isotope and trace element studies of the Great Dyke and Bushveld mafic phase and their relation to early Proterozoic magma genesis in southern Africa. J. Petrology, 18, 1977, 24–52.
  • Harmer R. E. and Sharpe M. R. Field relations and strontium isotope systematics of the marginal rocks of the eastern Bushveld Complex. Econ. Geol., 80, 1986,813–37.
  • Harris C. and Chaumba J. B. Crustal contamination and fluid—rock interaction during the formation of the Platreef, northern limb of the Bushveld Complex, South Africa. J. Petrology, 42, 2001, 1321–47.
  • Hatton C. J. and von Gruenewaldt G. The geological setting and petrogenesis of the Bushveld chromitite layers. In Stowe C. W. ed. Chromite deposits through time. International Geological Congress, Washington, 1989,109–42.
  • Hiemstra S. A. The role of collectors in the formation of the platinum deposits in the Bushveld Complex. Can. Miner., 17, 1979, 469–82.
  • Irvine T. N. Crystallization sequences in the Muskox intrusion and other layered intrusions-II. Origin of chromitite layers and simi-lar deposits of other magmatic ores. Geochim. cosmochim. Acta, 39, 1975,991–1020.
  • Irvine T. N. Origin of chromitite layers in the Muskox intrusion and other stratiform intrusions: a new interpretation. Geology, 5, 1977,273–7.
  • Irvine T. N., Keith D. W. and Todd S. G. The J-M platinum-palladium reef of the Stillwater Complex, Montana: II Origin by double diffusive convective magma mixing and implications for the Bushveld Complex. Econ. Geol., 78, 1983,1287–334.
  • Kruger F. J. The stratigraphy of the Bushveld Complex: a re-appraisal and relocation of the Main Zone boundaries. S. Afr. J. Geol., 93, 1990,376–81.
  • Kruger F. J. The origin of the Merensky cyclic unit: Sr-isotopic and mineralogical evidence for an alternative orthomagmatic model. Aus. J. Earth Sci., 39, 1992,255–61.
  • Kruger F. J. The Sr-isotopic stratigraphy of the western Bushveld Complex. S. Afr. J. Geol., 97, 1994,393–8.
  • Kruger F. J. and Marsh J. S. The significance of 875r/865r ratios in the Merensky cyclic unit of the Bushveld Complex. Nature, Lond., 298, 1982,53–5.
  • Kruger F. J. and Schoenberg R. Isotope evidence for the origin of PGE rich Bushveld chromitites and the Merensky Reef by felsic magma mixing. In Abstracts 8th International platinum symposium, South Africa, 28 June-3 July, 1997 (Geological Society of South Africa, 1997), 185–8.
  • Kruger F. J. et al. Chromite is the key to PGE. Paper to be pre-sented at 9th International platinum symposium, Stillwater, U.S.A., 2002.
  • Lee C. A. A review of mineralization in the Bushveld Complex and some other layered intrusions. Reference 25, 103–45.
  • Lee C. A. and Parry S. J. Platinum group element geochemistry of the Lower and Middle Group chromitites of the eastern Bushveld Complex. Econ. Geol., 85, 1988, 877–83.
  • Lesher C. M. and Keays R. R. Discrimination between mag-matic and hydrothermal Ni—Cu—PGE and PGE mineralization. Paper to be presented at 9th International platinum symposium, Stillwater, U.S.A., 2002.
  • Li C., Maier W. D. and de Waal S. A. The role of magma mix-ing in the genesis of PGE mineralization in the Bushveld Complex: Thermodynamic calculations and new interpretations. Econ. Geol., 96, 2001, 653–62.
  • Lonmin. A guide to the geology at Lonmin Platinum. Field guide, 2001, 10 p.
  • Maier W. D. and Barnes S-J. Platinum-group elements in sili-cate rocks of the Lower, Critical and Main Zones at Union Section, western Bushveld complex. J. Petrology, 40, 1999, 1647–71.
  • Mathez E. A. Magmatic metasomatism and formation of the Merensky Reef, Bushveld Complex. Contrib. Mineral. Petrol., 119, 1995, 277–86.
  • Merkle R. K. W. Platinum-group minerals in the Middle Group of chromitite layers at Marikana, western Bushveld Complex: indications for collection mechanisms and post-magmatic modifica-tion. Can. J. Earth Sci., 29, 1992, 209–21.
  • Mitchell A. A. The stratigraphy and mineralogy of the Main Zone of the northwestern Bushveld. S. Afr. J. Geol., 93, 1990, 818–31.
  • Molyneux T. G. A geological investigation of the Bushveld Complex in Sekhukhuneland and part of the Steelpoort Valley. Trans. geol. Soc. S. Afr., 77, 1974, 329–38.
  • Mungall J. A model for co-precipitation of platinum-group minerals with chromite from silicate melts. Paper to be presented at 9th International platinum symposium, Stillwater, U.S.A., 2002.
  • Naldrett A. J. Stratiform PGE deposits in layered intrusions. Rev. Econ. Geol., 4, 1989, 135–66.
  • Naldrett A. J. Magmatic sulphide deposits (Oxford: Oxford University Press, 1989), 186 p. Oxford Monographs on Geology and Geophysics 14
  • Nex P. A. The UG1, characteristics and causes. Spinel (chromium, vanadium, titanium and iron) geology, chemistry, extraction and uses. Short course abstracts, Bushveld Branch of Geol. Soc. S. Mr., Mooinooi, South Africa, 5–6 February, 2002.
  • Nex P. A. et al. A new stratigraphy for the Main Zone of the Bushveld Complex, in the Rustenburg area. S. Afr. J. Geol., 101, 1998, 215–23.
  • Okafor V. I. and Coville N. J. Platinum in catalysis. S. Afr. J. Sci., 95, 1999, 503–8.
  • Rice A. and von Gruenewaldt G. Convective scavenging and cascade enrichment in Bushveld Complex melts: possible mecha-nisms for concentration of platinum-group elements and chromite in mineralized layers. Trans. Instn Min. MetalL (Sect. B: App I. earth sci.), 103, 1994, B31–8.
  • Roeder P. L. and Reynolds I. Crystallization of chromite and chromium solubility in basaltic melts-1. Petrology, 32, 1991, 909–34.
  • South African Committee for Stratigraphy (SACS). Stratigraphy of South Africa. Part 1. Lithostratigraphy of the Republic of South Africa. Handbk. geol. Surv. S. Afr. 8, 1980, 690 p.
  • Sampson E. Magmatic chromitite deposits in Southern Africa. Econ. Geol., 27, 1932, 113–44.
  • Sattari P. et al. Chromite melt partitioning of Re and the PGE's. GAC-MAC Program with Abstracts 24, 109, Sudbury, 1999.
  • Schoenberg R. et al. PGE enrichment in chromitite layers and the Merensky Reef of the western Bushveld Complex; a Re—Os and Rb—Sr isotope study. Earth Planet. Sci. Lett., 172, 1999, 49–64.
  • Schiirmann L. W., Grabe P4, and Steenkamp C. J. Chromium. In Wilson M. G. C. and Anhaeusser C. R. eds The mineral resources of South Africa. Council for Geoscience Handbook16, 1998, 740 p.
  • Scoon R. G. and Teigler B. Platinum group element mineral-ization in the Critical Zone of the western Bushveld Complex: 1. Sulphide-poor chromitites below the UG2. Econ. Geol., 89, 1994, 1094–121.
  • Scoon R. G. and Teigler B. A new LG6 chromite reserve at Eerste Geluk in the boundary zone between the central and southern sectors of the eastern Bushveld Complex. Econ. Geol., 90, 1995, 969–82.
  • Sharpe M. R. The floor contact of the eastern Bushveld Complex: field relations and petrography. Res. Rep. Univ. Pretoria Inst. geol. Res. on the Bushveld Complex 36, 1982.
  • Sharpe M. R. Strontium isotope evidence for preserved density stratification in the Main Zone of the Bushveld Complex, South Africa. Nature, Lond., 316, 1985, 119–26.
  • Sharpe M. R. and Irvine T. N. Melting relations of two Bushveld chilled margin rocks and implications for the origin of chromitite. In Yearbook 82 (Washington: Carnegie Inst., 1983), 295–300.
  • Teigler B. and Eales H. V. Correlation between chromite com-position and PGE mineralization in the Critical Zone of the western Bushveld Complex. Mineral. Deposita, 28, 1993, 291–302.
  • Teigler B. and Eales H. V. The Lower and Critical Zones of the western limb of the Bushveld Complex as intersected by the Nooitgedacht borehole. Bull. geol. Surv. S. Afr., 111, 1996, 126 p.
  • Toshima N., Nakata K. and Kitoh H. Giant platinum clusters, with organic ligands, preparation and catalysis. Inorg. chim. Acta, 265, 1997, 149–53.
  • Tredoux M. et al. The fractionation of platinum-group ele-ments in magmatic systems with the suggestion of a novel causal mechanism. S. Afr. Geol., 98, 1995, 157–67.
  • Turner J. S. and Campbell I. H. Convection and mixing in magma chambers. Earth Sci. Rev., 23, 1986, 255–352.
  • Viljoen M. J. and Hieber R. The Rustenburg section of Rustenburg Platinum Mines Limited, with reference to the Merensky reef. In Anhaeusser C. R. and Maske S. eds Mineral deposits of south - em Africa (Johannesburg: Geol. Soc. S. Mr. 1986), 1107–34.
  • Viljoen M. J. and Schiirmann L. W. Platinum-group metals. Reference 65.
  • von Gruenewaldt G. and Merkle R. K. W. Platinum group ele-ment proportions in chromitites of the Bushveld Complex: implications for fractionation and magma mixing models. J. Afr. Earth Sci., 21, 4, 1975, 615–32.
  • von Gruenewald G. et al. Platinum group element—chromitite associations in the Bushveld Complex. Econ. Geol., 81, 1986, 1067–79.
  • von Gruenewald G. et al. PGE mineralization in the western sector of the eastern Bushveld Complex. Res. Rep. Univ. Pretoria Inst. geol. Res. on the Bushveld Complex 80, 1990, 37 p.
  • Wager L. R. and Brown G. M. Layered igneous rocks (Edinburgh: Oliver and Boyd, 1968), 588 p.
  • Wagner P. A. The platinum deposits and mines of South Africa (Edinburgh: Oliver and Boyd, 1929), 326 p.
  • White J. A. The Potgietersrus project: geology and exploration history. In Proc. 15th CMMI Congress (Johannesburg: S. Afr. Inst. Min. Metall.), 1994, 173–82.
  • Wilson J. R. et al. Intrusive origin for the unconformity in the northern Gap, western Bushveld Complex. S. Afr. J. Geol., 97, 1994, 462–72.

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