Re and Os distribution and Os isotope composition of the Platreef at the Sandsloot-Mogolakwena mine, Bushveld complex, South Africa

Chemical Geology

Volumn 281, Issue 3-4, 2011, Pages 352-363

  Reisberg, Laurie ^a   Tredoux, Marian ^b   Harris, Chris ^c   Coftier, Aline ^a,d   Chaumba, Jefferson ^c,e  

^a UNIVERSITÉ DE LORRAINE   (France)

^b UNIVERSITY OF THE FREE STATE   (South Africa)

^c UNIVERSITY OF CAPE TOWN   (South Africa)

^d BRGM   (France)

^e UNIVERSITY OF GEORGIA   (United States)

Author keywords

Bushveld; Merensky Reef; Os isotopes; Osmium; Platreef; Rhenium

Indexed keywords

BUSHVELD; BUSHVELD COMPLEX; DATA SCATTER; ISOTOPE COMPOSITIONS; ISOTOPIC COMPOSITION; ISOTOPIC DATA; MAGMATIC ROCK; MERENSKY REEF; OS ISOTOPES; PLATREEF; REGRESSION LINES; ROCK INTERACTION; SOUTH AFRICA;

ISOTOPES; OSMIUM; REEFS; RHENIUM; ROCKS; SILICATES;

RHENIUM COMPOUNDS;

CRUSTAL CONTAMINATION; EMPLACEMENT; ISOTOPIC COMPOSITION; MAGMA; OSMIUM ISOTOPE; PARENT MATERIAL; PYROXENITE; RHENIUM; WALL ROCK;

BUSHVELD COMPLEX; LIMPOPO; MERENSKY REEF; PLATREEF; SOUTH AFRICA;

EID: 79551611879     PISSN: 00092541     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.chemgeo.2010.12.021     Document Type: Article

References (92)

1. Allègre C.J., Luck J.-M. Osmium isotopes as petrogenetic and geologic tracers. Earth Planet. Sci. Lett. 1980, 48:148-154.
2. Armitage, P.E.B., McDonald, I., Edwards, S.J. and Manby, G.M., 2002. Platinum-group element mineralization in the Platreef and calc-silicate footwall at Sandsloot, Potgietersrus District, South Africa. Trans. Instn. Min. Metall., Sec. B: Appl. Ea. Sci. 111(Proc. Australas. Inst. Min. Metall., 307), B36-B45.
3. Ashwal L., Webb S.J., Knoper M.W. Magmatic stratigraphy in the Bushveld northern lobe: continuous geophysical and mineralogical data from the 2950 Bellevue drillcore. S.A. J. Geol. 2005, 108:199-232.
4. Ballhaus C., Sylvester P. Noble metal enrichment processes in the Merensky reef, Bushveld Complex. J. Petrol. 2000, 41:545-561.
5. Barnes S.-J., Campbell I.H. Role of late magmatic fluids in Merensky-type platinum deposits: a discussion. Geology 1988, 16:488-491.
6. Barnes S.-J., Maier W.D. Platinum-group element distributions in the Rustenberg Layered Suite of the Bushveld Complex, South Africa. The geology, geochemistry, mineralogy and mineral beneficiation of platinum-group elements 2002, 431-458. L.J. Cabri (Ed.).
7. Barnes S.-J., Maier W.D. Platinum-group elements and microstructures of normal Merensky Reef from Impala Platinum Mines. Bushveld Complex. J. Petrol. 2002, 43:103-128.
8. Barton J.J.M., Cawthorn R.G., White J.A. The role of contamination in the evolution of the Plat Reef of the Bushveld Complex. Econ. Geol. 1986, 81:1096-1104.
9. Birck J.-L., Roy Barman M., Capmas F. Re-Os isotopic measurements at the femtomole level in natural samples. Geostandards Newsl. 1997, 21:19-27.
10. Boudreau A.E. Modeling the Merensky Reef, Bushveld Complex, Republic of South Africa. Contrib. Mineral. Petrol. 2008, 156:431-437.
11. Boudreau A.E., Mathez E.A., McCallum I.S. Halogen geochemistry of the Stillwater and Bushveld complexes: evidence for transport of the platinum-group elements by Cl-rich fluids. J. Petrol. 1986, 27:967-986.
12. Boudreau A.E., Meurer W.P. Chromatographic separation of the platinum-group elements, gold, base metals and sulfur during degassing of a compacting and solidifying igneous crystal pile. Contrib. Mineral. Petrol. 1999, 134:174-185.
13. Brenan, J. and Andrews, D., 2001. High-temperature stability of laurite and Ru-Os-Ir alloy and their role in PGE fractionation in mafic magmas Canadian Mineral. 39(2), 341-360.
14. Brenan J.M. Re-Os fractionation by sulfide melt-silicate melt partitioning: a new spin. Chem. Geol. 2008, 248:140-165.
15. Buchanan D.L., et al. The genesis of sulphide mineralisation in a portion of the Potgietersrus limb of the Bushveld Complex. Econ. Geol. 1981, 76:568-579.
16. Buick I.S., Maas R., Gibson R. Precise U-Pb titanite age constraints on the emplacement of the Bushveld complex. SA. J. Geol. 2001, 158:3-6.
17. Campbell I.H., Naldrett A.J., Barnes S.-J. A model for the origin of the platinum rich sulphide horizons in the Bushveld and Stillwater Complexes. J. Petrol. 1983, 24:133-165.
18. Cawthorn R.G., Barton J.J.M., Viljoen M.J. Interaction of floor rocks with the Platreef on Overysel, Potgietersrus, northern Transvaal. Econ. Geol. 1985, 80:988-1006.
19. Cawthorn R.G., Cooper G.R.J., Webb S.J. Connectivity between the western and eastern limbs of the Bushveld Complex. S. Afr. J. Geol. 1998, 101:291-298.
20. Cawthorn R.G., Eales H.V., Walraven R., Uken R., Watkeys M.K. The Bushveld complex. The geology of South Africa 2006, 261-281. The Geological Society of South Africa, Johannesburg Council for Geoscience, Pretoria. M.R. Johnson, C.R. Anhauesser, R.J. Thomas (Eds.).
21. Cawthorn R.G., Lee C.A., Schouwstra R.P., Mellowship P. Relationship between PGE and PGM in the bushveld complex. Can. Mineral. 2002, 40:311-328.
22. Cawthorn, R.G., Merkle, R.K.W. and Viljoen, M.J., 2002b. Platinum-group element deposits in the Bushveld Complex, South Africa. In: L.J. Cabri (Editor), The geology, geochemistry, mineralogy and mineral beneficiation of platinum-group elements, pp. 389-430.
23. Cawthorn, R.G. and Tredoux, M., 2003. The possibility of survival of PGM micro-xenocrysts in mantle melts, 9th International Platinum symposium, Montana, USA, pp. abstract.
24. Creaser R.A., Papanastassiou D., Wasserburg G.J. Negative thermal ion mass spectrometry of osmium, rhenium, and iridium. Geochim. Cosmochim. Acta 1991, 55:397-401.
25. Davies G., Tredoux M. The platinum-group element and gold contents of the marginal rocks and sills of the Bushveld Complex. Econ. Geol. 1985, 80:838-848.
26. Eales, H.V. and Cawthorn, R.G., 1996. The Bushveld Complex. In: R.G. Cawthorn (Editor), Layered intrusions. Elsevier Science B.V., pp. 181-229.
27. Farquhar J., Bao H.M., Thiemens M. Atmospheric influence of earth's earliest sulfur cycle. Science 2000, 289:756-758.
28. Fleet M., Crocket J.H., Stone W.E. Partitioning of platinum-group elements (Os, Ir, Ru, Pt, Pd) and gold between sulfide liquid and basalt melt. Geochim. Cosmochim. Acta 1996, 60:2397-2412.
29. Fonseca R.O.C., Mallmann G., O'Neill H.S.C., Campbell I.H. How chalcophile is rhenium? Experimental study solubility Re sulphide mattes. Earth Planet. Sci. Lett. 2007, 260:537-548.
30. Gain S.B., Mostert A.B. The geological setting of the platinoid and base metal sulfide mineralisation in the Platreef of the Bushveld Complex in Drenthe, north of Potgietersrus. Econ. Geol. 1982, 77:1395-1404.
31. Hall, A.L., 1932. The Bushveld Igneous Complex of the Central Transvaal. Geological Survey of South Africa Memoir, 27.
32. 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. Petrol. 1977, 18:24-52.
33. Harmer R., Sharpe M.R. Field relations and strontium isotope systematics of the marginal rocks of the eastern Bushveld Complex. Econ. Geol. 1985, 80:813-837.
34. Harris C., Chaumba J.B. Crustal contamination and fluid-rock interaction during the formation of the Platreef, Northern Limb of the Bushveld Complex, South Africa. J. Petrol. 2001, 1321-1347. 42.
35. Harris C., Pronost J.J.M., Ashwal L., Cawthorn R.G. Oxygen and hydrogen isotope stratigraphy of the Rustenburg Layered Suite Bushveld Complex: constraints crustal contamination. J. Petrol. 2005, 46:579-601.
36. Hart S.R., Kinloch E.D. Osmium isotope systematics in Witwatersrand and Bushveld ore deposits. Econ. Geol. 1989, 84:1651-1655.
37. Hatton C.J., Schweitzer J.K. Evidence for synchronous extrusive and intrusive Bushveld magmatism. J. Afr. Earth Sci. 1995, 21:579-594.
38. Holwell D.A., Armitage P.E.B., McDonald I. Observations on the relationship between the Platreef and its hangingwall Transactions of the Institutions of Mining and Metallurgy. B Appl. Earth Sci. 2005, 114:B199-B207.
39. Holwell D.A., Armitage P.E.B., McDonald I. Platinum-group mineral assemblages in the Platreef at the Sandsloot mine, northern Bushveld Complex, South Africa Miner. Magazine 2006, 70:83-101.
40. Holwell D.A., McDonald I. Petrology, geochemistry and the mechanisms determining the distribution of the platinum-group element and base metal sulphide mineralization in the Platreef, Overysel, northern Bushveld Complex. SA. Miner. Deposita 2006, 41:757-798.
41. Holwell, D.A., McDonald, I. and Butler, I.B., 2010. Precious metal enrichment in the Platreef, Bushveld complex, South Africa: evidence from homogenized magmatic sulfide melt inclusions. Contrib. Mineral. Petrol. in press.
42. Hutchinson, D. and Foster, J., 2010. Why is the Merensky Reef so enriched in precious metals compared to the Platreef? Magmatic processing efficiency, plain and simple, 11th International Platinum Symposium, Sudbury, Ontario, pp. abstract.
43. Kinloch E.D., Peyerl W. Platinum-group minerals in various rock types of the Merensky reef: genetic implications 1990, Econ, Geol, 85.
44. Kinnaird J.A. Geochemical evidence for multiphase emplacement in the southern Platreef Transactions of the Institutions of Mining and Metallurgy, Section B. Appl. Earth Sci. 2005, 114:B225-B242.
45. Kinnaird J.A., Hutchinson D., Schurmann L., Nex P.A.M., De Lange R. Petrology and mineralisation of the southern Platreef: northern limb of the Bushveld Complex, South Africa. Mineral. Dep. 2005, 40:576-597.
46. Kruger F.J. The Sr-isotopic stratigraphy of the Western Bushveld Complex. S. Afr. J. Geol. 1994, 97:393-398.
47. Kruger F.J. Filling the Bushveld Complex magma chamber: lateral expansion, roof and floor interaction, magmatic unconformities, and the formation of giant chromitite, PGE and Ti-V-magnetitite deposits. Mineral. Dep. 2005, 40:451-472.
48. Kruger F.J., Marsh J.S. Significance of 87Sr/86Sr ratios in the Merensky cyclic unit of the Western Bushveld Complex. Econ. Geol. 1982, 80:958-974.
49. Kyser, T.K., 1986. Stable isotope variations in the mantle. In: J.W. Valley (Editor), Stable Isotopes in High Temperature Geological Processes. Reviews in Mineralogy. Mineralogical Society of America, pp. 141-164.
50. Lee, C.A., 1996. A review of mineralization in the Bushveld Complex and some other layered intrusions. In: R.G. Cawthorn (Editor), Layered Intrusions. Elsevier Science B.V., pp. 103-145.
51. Ludwig, K.R., 2003. Isoplot 3.00 A Geochronological Toolkit for Microsoft Excel. Berkeley Geochronology Center.
52. Maier W.D., Arndt N.T., Curl E.A. Progressive crustal contamination of the Bushveld Complex: evidence from Nd isotopic analyses of the cumulate rocks. Contrib. Mineral. Petrol. 2000, 140:316-327.
53. Maier W.D., et al. Petrogenesis of contact-style PGE mineralization in the northern lobe of the Bushveld Complex: comparison of data from the farms Rooipoort, Townlands. Drenthe Nonnenwerth. Miner. Deposita 2008, 43:255-280.
54. Mathez E.A. Magmatic metasomatism and formation of the Merensky reef, Bushveld Complex. Contrib. Mineral. Petrol. 1995, 119:277-286.
55. Mattey D., Lowry D., Macpherson C. Oxygen isotope composition of mantle peridotite. Earth Planet. Sci. Lett. 1994, 128:231-241.
56. McCandless T.E., Ruiz J. Osmium isotopes and crustal sources for platinum-group mineralization in the Bushveld Complex, South Africa. Geology 1991, 19:1225-1228.
57. McCandless T.E., Ruiz J., Adair B.I., Freydier C. Re-Os isotope and Pd/Ru variations in chromitites from the Critical Zone, Bushveld Complex. SA. Geochim. Cosmochim. Acta 1999, 63:911-923.
58. McDonald I., Holwell D.A., Armitage P.E.B. Geochemistry and mineralogy of the Platreef and "Critical Zone" of the northern limb of the Bushveld complex, South Africa: implications Bushveld stratigraphy development PGE mineralogy. Miner. Deposita 2005, 40:526-549.
59. Meisel T., Walker R.J., Irving A.J., Lorand J.-P. Osmium isotopic compositions of mantle xenoliths: a global perspective. Geochim. Cosmochim. Acta 2001, 65:1311-1323.
60. Meyer F.M., Robb L.J. The geochemistry of black shales from the Chuniespoort Group, Transvaal Sequence, Eastern Transvaal, South Africa. Econ. Geol. 1996, 91:111-121.
61. Meyer R., De Beer J.H. The structure of the Bushveld Complex from resistivity measurements. Nature 1987, 325:610-612.
62. Naldrett A.J., Wilson A., Kinnaird J.A., Chunnett G. PGE tenor and metal ratios within and below the Merensky Reef, Bushveld Complex: implications for its genesis. J. Petrol. 2009, 50:625-659.
63. Neal C.R., et al. Eclogites with oceanic crustal and mantle signatures from the Bellsbank kimberlite, South Africa, part 2: Sr, Nd, and O isotope geochemistry Earth Planet. Sci. Lett. 1990, 99:362-379.
64. Penniston-Dorland S.C., et al. Multiple sulfur isotopes reveal a magmatic origin for the Platreef platinum group element deposit, Bushveld Complex, South Africa. Geology 2008, 36:979-982.
65. Prevec S.A., Ashwal L., Mkaza M.S. Mineral disequilibrium in the Merensky Reef, western Bushveld Complex, South Africa: new Sm-Nd isotopic evidence. Contrib. Mineral. Petrol. 2005, 149:306-315.
66. Prichard H.M., Barnes S.-J., Maier W.D., Fisher P.C. 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. Can Miner. 2004, 42:423-437.
67. Pronost J.J.M., Harris C., Pin C. Relationship between footwall composition, crustal contamination, and fluid-rock interaction in the Platreef, Bushveld Complex. SA. Miner. Deposita 2008, 43:825-848.
68. Ravizza G., Turekian K.K. Application of the 187Re-187Os system to black shale geochronometry. Geochim. Cosmochim. Acta 1989, 53:3257-3262.
69. Reid D.L., Cawthorn R.G., Kruger F.J., Tredoux M. Isotope and trace-element patterns below the Merensky Reef, Bushveld Complex, South Africa: evidence for fluids. Chem. Geol. 1993, 106:171-186.
70. Richardson S.H., Shirey S.B. Continental mantle signature of Bushveld magmas and coeval diamonds. Nature 2008, 453:910-913.
71. Ruiz, J., Barra, F., Ashwal, L.D. and Le Grange, M., 2004. Re-Os systematics on sulfides from the Platreef, Bushveld Complex, South Africa, Geoscience Africa, Johannesburg, South Africa, pp. P. 564 (abstract).
72. SACS Stratigraphy of South Africa, Handbook 8 1980, Geological Survey of South Africa, Pretoria, 690pp.
73. Schiffries C.M., Rye D.M. Stable isotopic systematics of the Bushveld Complex. I. Constraints magmatic processes layered intrusions. Am. J. Sci. 1989, 289:841-873.
74. Schiffries C.M., Rye D.M. Stable isotopic systematics of the Bushveld Complex. II. Constraints hydrothermal processes layered intrusions. Am. J. Sci. 1990, 290:209-245.
75. Schoenberg R., Kruger F.J., Nägler T.F., Meisel T., Kramers J.D. 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. 1999, 172:49-64.
76. Scoates J.S., Friedman R.M. Precise age of the platiniferous Merensky reef, Bushveld Complex, South Africa, by the U-Pb zircon chemical abrasion ID-TIMS technique. Econ. Geol. 2008, 103:465-471.
77. Seabrook C.L., Cawthorn R.G., Kruger F.J. The Merensky reef, Bushveld Complex: mixing of minerals not mixing of magmas. Econ. Geol. 2005, 100:1191-1206.
78. Sharpe M.R. Strontium isotope evidence for preserved density stratification in the Main Zone of the Bushveld Complex. Nature 1985, 316:119-126.
79. Sharpe M.R., Bahat D., von Gruenewaldt G. The concentric elliptical structure of feeder sites to the Bushveld Complex and possible economic implications. Trans Geol Soc S Afr 1981, 84:239-244.
80. Shirey S.B., Walker R.J. Carius tube digestion for low-blank rhenium-osmium analysis. Anal. Chem. 1995, 67:2136-2141.
81. Shirey S.B., Walker R.J. The Re-Os isotope system in cosmochemistry and high-temperature geochemistry. Annu. Rev. Earth Planet. Sci. 1998, 26:423-500.
82. Tredoux, M., 1990. The platinum-group elements: methods for their analysis and their distribution in terrestrial rocks and meteorites. PhD Thesis, Univ. of the Witwatersrand, South Africa.
83. Tredoux M., Lindsay N.M., Davies G., McDonald I. The fractionation of platinum-group elements in magmatic systems, with the suggestion of a novel causal mechanism. S. Afr. J. Geol. 1995, 98:157-167.
84. Van der Merwe M.J. The layered sequence of the Potgietersrus limb of the Bushveld complex. Econ. Geol. 1976, 71:1337-1351.
85. Volkening J., Walczyk T., Heumann K.G. Osmium isotope determinations by negative thermal ionization mass spectrometry. Int. J. Mass Spec. Ion Phys. 1991, 105:147-159.
86. Wagner P.A. The platinum deposits and mines of South Africa 1929, Oliver and Boyd, Edinburgh.
87. Walraven F., Armstrong R.A., Kruger F.J. A chronostratigraphic framework for the north-central Kaapvaal craton, the Bushveld Complex and the Vredefort structure. Tectonophysics 1990, 171:23-48.
88. Webb S.J., Cawthorn R.G., Nguuri T., James D. Gravity modeling of Bushveld Complex connectivity supported by Southern African seismic experiment results. S. Afr. J. Geol. 2004, 107(207-218).
89. White J.A. The Potgietersrus project - geology and exploration history The XVth CMMI Congress 1994, 173-181. Johannesburg, South Africa. C.R. Anhausser (Ed.).
90. Wille M., et al. Evidence for a gradual rise of oxygen between 2.6 and 2.5Ga from Mo isotopes and Re-PGE signatures in shales. Geochim. Cosmochim. Acta 2007, 71:2417-2435.
91. Willmore C.C., Boudreau A.E., Kruger F.J. The halogen geochemistry of the Bushveld Complex, Republic of South Africa: implications chalcophile element distribution Low. Crit. Zones. J. Petrol. 2000, 41:1517-1539.
92. Wilson A., Chunnett G. Trace element and Platinum Group Element distributions and the genesis of the Merensky Reef, western Bushveld Complex. SA. J. Petrol. 2006, 47:2369-2403.