 | | Journal (article/letter/editorial) | | ROGER N. SCOON† P.O. Box 2461, Rivonia 2128, South Africa AND ANDREW A. MITCHELL School of Geology,...KwaZulu-Natal, Private Bag 54001, Durban 4000, South Africa Abstract Discordant ultramafic bodies are a...significant feature of the Bushveld Complex, South Africa. Many of these bodies form subvertical, cylindrical...assemblage of forsteritic olivine with accessory Cr spinel), together with an extensive rim of clinopyroxenite...magnesian dunite pipes were forsteritic olivine and Cr spinel. Crystallization of orthopyroxene and plagioclase |  | | Journal (article/letter/editorial) | | bodies Roger N. Scoon PO Box 2461, Rivonia 2128, South Africa e-mail: rnscoon@iafrica.com Andrew A. Mitchell...4000, South Africa e-mail: mitchell@pixie.udw.ac.za © 2004 Geological Society of South Africa ABSTRACT...in the Upper Critical zone, the Onverwacht and Twyfelaar pipes occur in the Lower Critical and Lower zones...forsteritic olivine (Fo85-80) with accessory Cr-spinel. The magnesian dunite forms comparatively deep-rooted...deep-rooted, stock-like bodies. At Onverwacht and Twyfelaar, the stocks are rimmed by irregular bodies of |  | | Journal (article/letter/editorial) | | REPLACED MERENSKY REEF AT THE AMANDELBULT MINE, SOUTH AFRICA R.N. SCOON Department of Geology, Rhodes...Rhodes University, Grahamstown 6140, South Africa e-mail: rnscoon@iafrica.com A.A. MITCHELL School of Geological...4000, South Africa e-mail: mitchaa@mweb.co.za © 2011 March Geological Society of South Africa ABSTRACT...in the eastern limb of the Bushveld Complex, South Africa, differ sufficiently from one another to warrant...contributions on the Driekop, Onverwacht, and Twyfelaar localities we noted that despite the pipes being |  | Scoon, Roger N., Mitchell, Andrew A. (2019) Discussion of “Oxygen isotope and trace element compositions of platiniferous dunite pipes of the Bushveld Complex, South Africa - Signals from a recycled mantle component?” by Günther, T., Haase, K.M., Junge, M., Oberthür, T., Woelki, D., and Krumm, S. Lithos, 324. 893-898 doi:10.1016/j.lithos.2018.09.023 | Journal (article/letter/editorial) | | platiniferous dunite pipes of the Bushveld complex, South Africa - Signals from a recycled mantle component?”...platiniferous dunite pipes of the Bushveld complex, South Africa - Signals from a recycled mantle component?”...platiniferous dunite pipes of the Bushveld Complex, South Africa - Signals from a recycled mantle component?”...University, Grahamstown 6140, South Africa 2 PO Box 421, McGregor 6708, South Africa MA NU SC 1 TE D...platiniferous dunite pipes of the Bushveld Complex, South Africa in many respects. The attempt to suggest there |  | | Journal (article/letter/editorial) | | Geology, Rhodes University, Grahamstown 6140, South Africa e-mail: rnscoon@iafrica.com A.A. MITCHELL Department...Durban 4000, South Africa e-mail: mitchaa@mweb.co.za © 2010 June Geological Society of South Africa ABSTRACT...as it is the site of the oldest platinum mine in South Africa. The central part of the pipe consists of...dunite pipes, Driekop, Mooihoek, Onverwacht, and Twyfelaar, are restricted to a 20-km linear belt in the...downwarped (Scoon and Mitchell, 2009). Despite SOUTH AFRICAN JOURNAL OF GEOLOGY, 2010, VOLUME 113.2 PAGE |  | | Journal (article/letter/editorial) | | DISCUSSION Discussion of “The Bushveld Complex, South Africa: formation of platinum–palladium, chromeand...of Geology, Rhodes University, Grahamstown, South Africa e-mail: rnscoon@iafrica.com A. A. Mitchell School...KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa De Klerk, Canad Mineral 25:51–77, 1987) and...from the Upper Critical Zone at the Amandelbult mine (32 samples), 2 magnesian dunite, Winnaarshoek pipe...are mistaken in this regard) with accessory Cr-spinel (Scoon and Mitchell 2004b). The mineralogy and |  | | Journal (article/letter/editorial) | | (Cameron, 1963) by traversesalong lines acrossfarms Twyfelaar 119 KT, Driekop 253 KT, Doornbosch 294 KT, and...Forest Hill 117 KT 14. Clapham 118 KT 15. Twyfelaar 119 KT 16. Groothoek 25(5 K"[ 17, D•iekop 253...phaseor phasespresent,with or without an and Twyfelaar (Cameron, 1968). Norires compose adjectiveindicatingthe...obtainedthroughthe courtesyof JoConsolidated InvestmentCompany,South rock is directly overlainby the UG-2 chromitite...drill hole 15, the UG-2 layer is about 0.7 m thick, Africa. includinga 0.2-m parting of fine-grainedbronzitite |  | | Journal (article/letter/editorial) | | Complex, South Africa R.N. Scoon Department of Geology, Rhodes University, Grahamstown 6140, South Africa...Geology, Rhodes University, Grahamstown 6140, South Africa Department of Earth, Environmental and Planetary...Operations South Africa, Rustenburg, South Africa © 2017 June Geological Society of South Africa Abstract...Abstract The 2055 Ma Bushveld Complex, South Africa, is well known for the occurrence of discordant bodies...core-zone of massive Fe-Ti oxides was the last SOUTH AFRICAN JOURNAL OF GEOLOGY 2017 • VOLUME 120.2 PAGE |  | | Journal (article/letter/editorial) | | ultramafic pegmatite at the Amandelbult Platinum mine, northwestern Bushveld Complex R. N. SCOON1,* 1...2128, South Africa Department of Geology, Rhodes University, PO Box 94, Grahamstown 6140, South Africa...pegmatite are described from the Amandelbult Platinum mine in the northwestern part of the Bushveld Complex...Ti-magnetite, disseminated Fe-Ti-Cr spinel and massive Fe-Ti-Cr spinel. The Fe-Ti-Cr spinels show a range...relationship was found between stratigraphic height and spinel-type, with the Fe-Ti-Cr spinels restricted to pegmatites |  | | Journal (article/letter/editorial) | | observed although hybrid chromite-Ti magnetite spinel may occur. The nature of the pyroxene(orthopyroxene...critical and main zonesbut appear body on the farm Twyfelaar (Fig. 1). They are composite,pipelike bodieswhich...in the caseof the largest cluster occurs farther south on the farms Tweefontein body on AnnexGrootboom...BastardReefs.These include a large body immediately south of the Pilanesberg,a cluster of large pipes on the...bodies only a few meters thick which extend along mine (Viljoen et al., in press). In this area the strike |  | | Journal (article/letter/editorial) | | PIPE, EASTERN LIMB OF THE BUSHVELD COMPLEX, SOUTH AFRICA R.N. SCOON Postnet Suite 291, Private Bag X31...Durban 4000, South Africa e-mail: mitchaa@mweb.co.za © 2009 June Geological Society of South Africa ABSTRACT...on the basis of detailed mapping and sampling of mine workings that are not generally accessible. The...at Driekop are distinguished by the absence of a spinel phase. The pipe crosscuts a thick sequence of leucocratic...through a vertical conduit. Magnesian olivine and Cr-spinel were the only liquidus phases during this phase |  | | Journal (article/letter/editorial) | | concentrates originating from the Driekop platinum mine, South Africa, collected and first described by E. F. Stumpfl...the Upper Critical Zone, and the Onverwacht and Twyfelaar pipes in the Lower Critical and Lower Zones, are...forsteritic olivine (Fo85 – 80) and accessory chromian spinel, rimmed either by a younger assemblage of iron-rich...Mooihoek), or by magnesian harzburgite (Onverwacht, Twyfelaar). The PGE mineralization is concentrated in cylindrical...closed in first description 1930, but the Driekop mine was re-opened by Otavi Mining between 1956 and 1958 |  | Maier, W. D., Barnes, S.-J., Groves, D. I. (2013) The Bushveld Complex, South Africa: formation of platinum–palladium, chrome- and vanadium-rich layers via hydrodynamic sorting of a mobilized cumulate slurry in a large, relatively slowly cooling, subsiding magma chamber. Mineralium Deposita, 48 (1) 1-56 doi:10.1007/s00126-012-0436-1 | Journal (article/letter/editorial) | | 1007/s00126-012-0436-1 ARTICLE The Bushveld Complex, South Africa: formation of platinum– palladium, chrome- and...mines, 2 Union platinum mine, 3 Impala platinum mines, 4 Rustenburg platinum mine, 5 Western platinum and...mines, 6 Crocodile River mine, 7 Messina platinum mine, 8 Atok platinum mine, 9 Maandagshoek section with...with Modikwa platinum mine, 10 Mineral Range and Sheba’s Ridge deposit, 11 Rooipoort, Moorddrift, and...were delayed until the Geological Survey of South Africa collared a series of boreholes (NG1– NG3) at |  | | Journal (article/letter/editorial) | | constitutethe world'slargestknownchro- farms Twyfelaar 119 KT, Driekop 253 KT, and mite deposits. Various...of the mineralogicaland chemical KT; by studiesin mine workingson Jadglust418 evolutionof the Critical...basedon de- Zone is given by outcrops,drill holes,and mine 845 846 2 g*45 ' E. N. CAMERON 3 0'00' 30'15'...another in the floor of the adit at the Winterveld mine, but the lower- most part of the sectionis basedon...present. Olivine grains range from 1.6 to dated Lands mine on Doornbosch, the footwall of 4.0 mm in diameter |  | | Report (issue) | | Publications, Ltd., Gardenvale, Que. ; in the Union of South Africa from Central News Agency, Ltd., P.O. Box 1033...by tho High Commis sioner for the Union of South Africa. Professor V. G. Shepheard, R.C.N.C., nominated...Leone Southern Rhodesia Tanganyika Union of South Africa . . Canada Newfoundland British North Borneo...66 67 69 70 70 71 71 74 Vi PAGE French West Africa Madagascar Cuba .. Costa Rica Guatemala Puerto...principally in the oxide form in the minerals of the spinel group, especially chromite, and to a minor extent |  | | Book (edition) | | OF OF SOUTH AFRICA MINES GEOLOGICAL SURVEY MINERAL RESOURCES OF REPUBLIC OF THE SOUTH AFRICA...Second World War, and partly as a result of it, South Africa experienced vast industrial expansion. This...official ‘handbook on the mineral resources of South Africa, it has become necessary to revise, or rather...great diversity and magnitude of South African mineral deposits and local mining operations, the Economic...Chamber of Mines of South Africa with Mr G. H. Grange as co-ordinator, and the South, African mining industry; |  | | Report (issue) | | Platinum Symposium in Rustenburg, Republic of South Africa. The abstract volume for this meeting contained...mineralization, in countries like the Republic of South Africa, Canada, and Finland. Over the last five or...platinum-group minerals (PGM) beginning with a South African publication (Cabri, 1972) and culminating...of PGE deposits, ranging from the very important South African deposits to less well-developed PGE mineralization...of South Africa Lyndon, Washington College Park, Maryland Johannesburg, Republic of South Africa Kansas |  | | Book | | Using examples from the Bushveld complex of South Africa and other intrusions, this book provides a comprehensive...314–321, 3rd Floor, Plot 3, Splendor Forum, Jasola District Centre, New Delhi – 110025, India 79 Anson Road...denote a silicate liquid produced specifically by the local melting of pre-existing crystals. The terms volatile...sill-like intrusions such as the Bushveld Complex in South Africa that is up to 9 km thick and extends over 50...grains owing to variations in grain size or the local environment a crystal finds itself. Classical interpretations |  | | Book | | Sciences University of Cape Town Rondebosch, South Africa ISSN 2510-1307 ISSN 2510-1315 (electronic)...Azurite crystals, partly replaced by malachite, Tsumeb mine, Namibia; width of view ca. 3 cm; collection H.E...the Medieval Latin word mina = shaft (minare = to mine). The antique people, e.g., the Greeks and Romans...Chap. 6), periclase, MgO, uraninite (7 Sect. 7.4), spinel, magnetite, chromite (7 Sect. 7.2), and the garnet...n Fluorite CaF2 1.434 Halite NaCl 1.544 Spinel MgAl2O4 1.714 Almandine garnet Fe2+3Al2[SiO4]3 |
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