Distribution of platinum-group elements in pristine and near-surface oxidized Platreef ore and the variation along strike, northern Bushveld Complex, South Africa
作者： Malte Junge , Thomas Oberthür , Dennis Kraemer , Frank Melcher , Ruben Piña
DOI: 10.1007/S00126-018-0848-7
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摘要: The Platreef of the Bushveld Complex is currently largest PGE open pit deposit. In order to investigate behavior during weathering, three boreholes covering a sequence oxidized and pristine ore from Mogalakwena mine were studied. Further, sulfides platinum-group minerals (PGM) at various locations along strike Platreef, Townlands, Tweefontein Nonnenwerth compared those (Overysel, Sandsloot). ore, generally occur as PGM, or in solid solution within sulfides. PGM are usually associated with sulfide mainly comprise (Pt,Pd)-bismuthotellurides, cooperite-braggite, sperrylite. Electron probe microanalysis (EPMA) laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS) indicate concentrations Pd pentlandite (up 185 ppm), whereas pyrrhotite contains up 15 ppm Os, Ir, Ru, chalcopyrite devoid PGE. Two compositionally different groups pyrite differing Ni, Co, Pt contents identified. Sulfur isotope data degrees assimilation country rocks. Near-surface, ores have large economic potential. However, attempts extract proven unfeasible due low recoveries (< 30%) achieved by conventional metallurgical methods. ores, rare relict present. EPMA LA-ICP-MS measurements demonstrated that secondary iron oxides/hydroxides silicates contain erratically distributed Rh, Pt, several 100 ppm). polymodal distribution weathered explains recovery rates flotation processing.
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Sarah-Jane Barnes, P. Pagé, H. M. Prichard, M. L. Zientek, P. C. Fisher, Chalcophile and platinum-group element distribution in the Ultramafic series of the Stillwater Complex, MT, USA—implications for processes enriching chromite layers in Os, Ir, Ru, and Rh Mineralium Deposita. ,vol. 51, pp. 25- 47 ,(2016) , 10.1007/S00126-015-0587-Y
Hans Schneiderhöhn, Percy Albert Wagner, The platinum deposits and mines of South Africa ,(1973)
Anthony J. Naldrett, Magmatic Sulfide Deposits: Geology, Geochemistry and Exploration ,(2004)
Michael S. Moats, Frank K. Crundwell, William G. Davenport, Timothy G. Robinson, Venkoba Ramachandran, Extractive Metallurgy of Nickel, Cobalt and Platinum Group Metals ,(2011)
Thomas Oberthür, Malte Junge, Nikolay Rudashevsky, Eveline de Meyer, Paul Gutter, Platinum-group minerals in the LG and MG chromitites of the eastern Bushveld Complex, South Africa Mineralium Deposita. ,vol. 51, pp. 71- 87 ,(2016) , 10.1007/S00126-015-0593-0
Tawanda Darlington Manyeruke, Compositional and lithological variation of the Platreef on the farm Nonnenwerth, northern lobe of the Bushveld complex : implications for the origin of Platinum-group elements (PGE) mineralization University of Pretoria. ,(2009)
C.J. Duran, S.-J. Barnes, J.T. Corkery, Chalcophile and platinum-group element distribution in pyrites from the sulfide-rich pods of the Lac des Iles Pd deposits, Western Ontario, Canada: Implications for post-cumulus re-equilibration of the ore and the use of pyrite compositions in exploration Journal of Geochemical Exploration. ,vol. 158, pp. 223- 242 ,(2015) , 10.1016/J.GEXPLO.2015.08.002
Carol A. Finn, Paul A. Bedrosian, Janine C. Cole, Tshepo David Khoza, Susan J. Webb, Mapping the 3D extent of the Northern Lobe of the Bushveld layered mafic intrusion from geophysical data Precambrian Research. ,vol. 268, pp. 279- 294 ,(2015) , 10.1016/J.PRECAMRES.2015.07.003
Jennifer W. Smith, David A. Holwell, Iain McDonald, Adrian J. Boyce, The application of S isotopes and S/Se ratios in determining ore-forming processes of magmatic Ni–Cu–PGE sulfide deposits: A cautionary case study from the northern Bushveld Complex Ore Geology Reviews. ,vol. 73, pp. 148- 174 ,(2016) , 10.1016/J.OREGEOREV.2015.10.022
Thomas Oberthür, Thorolf W. Weiser, Lothar Gast, Kari Kojonen, Geochemistry and mineralogy of platinum-group elements at Hartley Platinum Mine, Zimbabwe Mineralium Deposita. ,vol. 38, pp. 327- 343 ,(2003) , 10.1007/S00126-002-0337-9