 | DepinĂŠ, M., Frimmel, H. E., Emsbo, P., Koenig, A. E., Kern, M. (2013) Trace element distribution in uraninite from Mesoarchaean Witwatersrand conglomerates (South Africa) supports placer model and magmatogenic source. Mineralium Deposita, 48 (4) 423-435 doi:10.1007/s00126-013-0458-3 | Journal (article/letter/editorial) | | distribution in uraninite from Mesoarchaean Witwatersrand conglomerates (South Africa) supports placer...and rare earth element (REE) distribution in uraninite from various gold-bearing conglomerates of the...the Mesoarchaean Central Rand Group in South Africaâs Witwatersrand Basin by in situ laser ablation-inductively...spectrometry confirms a placer origin for the uraninite and a magmatogenic provenance thereof. The chemistry...chemistry of commonly rounded to sub-rounded uraninite is highly variable from grain to grain but generally |  | | Journal (article/letter/editorial) | | homepage: www.elsevier.com/locate/apgeochem Uraninite chemistry as forensic tool for provenance analysis...Sciences, University of Cape Town, Rondebosch 7701, South Africa c GeoZentrum Nordbayern, University of Erlangen-NĂźrnberg...(LA-ICPMS) analyses were carried out on individual uraninite grains from several localities worldwide, representing...comprehensive set of minor/trace elements in uraninite are presented, i.e. LAICPMS concentration data...concentrations, reveal systematic differences in uraninite composition between genetically different deposit |  | | Journal (article/letter/editorial) | | hat ReflectProterozoicWeathering, Welkom Gold Field, South Africa W. E. L. MINTER, Departmentof Geology...of erosionin the Witwatersrand succession in the Welkom gold field. Fluvial and debris flow sedimentson...of arthe earliest cratonic sediments in southern Africa enites,with minor gravelfacies,andwere deposited...the St. Helenafan and at the baseof the overlying Welkom fan, is referred to collectivelyasthe Intermediate... The Basal and Steyn placers at the top of the Welkom Formation represent terminal gravelsin two coalescing |  | | Report (chapter) | | Downloaded from http://sp.lyellcollection.org/ at Ohio State University Library on September 16, 2012 Geological...mineralization within the Witwatersrand Basin, South Africa: evidence for a modified placer origin, and...02 Email alerting service click here to receive free e-mail alerts when new articles cite this article... Downloaded from http://sp.lyellcollection.org/ at Ohio State University Library on September 16, 2012 Gold mineralization...mineralization within the Witwatersrand Basin, South Africa: evidence for a modified placer origin, and |  | | Report (issue) | | early Proterozoic conglomerates of the Black Hills, South Dakota, USA .......... J.A. Redden Application of................................. 235 W. Vogel SOUTH AFRICA Uranium distribution and redistribution in...Pre-Witwatersrand and Witwatersrand conglomerates from South Africa ...................... 255 M. Meyer, R. Saager...uranium during Proterozoic weathering, Welkom Goldfield, South Africa .....................................Dalton uranium prospect, Northern Zululand, South Africa ........................................... |  | | Journal (article/letter/editorial) | | Keywords Gold ĂĄ Microfabrics ĂĄ Paleoplacer ĂĄ South Africa ĂĄ Witwatersrand Abstract Microfabrics of detrital...various goldÂŽelds of the Witwatersrand Basin, South Africa, were investigated by optical and cathodoluminescence...round grains of pyrite, zircon, chromite and uraninite demonstrate that these materials were present...km2 in the Free State and the Northwest, Gauteng and Mpumalanga provinces of South Africa (Fig. 1). The...samples of the present study originate from the Welkom, Klerksdorp, Carletonville and Evander goldÂŽelds |  | Mossman, D.J., Minter, W.E.L., Dutkiewicz, A., Hallbauer, D.K., George, S.C., Hennigh, Q., Reimer, T.O., Horscroft, F.D. (2008) The indigenous origin of Witwatersrand âcarbonâ. Precambrian Research, 164 (3) 173-186 doi:10.1016/j.precamres.2008.04.008 | Journal (article/letter/editorial) | | Rondebosch 7700, South Africa c School of Geosciences, University of Sydney, Sydney, New South Wales 2006,...Planetary Sciences, Macquarie University, Sydney, New South Wales 2109, Australia f Evolving Gold Corporation...(2001, p. 1907) who, simply (and erroneously), state that âBecause the Witwatersrand (our italics) carbonaceous...accompany the dominant bitumen in these samples. The local dominance of solid bitumen over kerogen can account...components) have void spaces partially ďŹlled with uraninite and sulďŹdes (pyrite and radiogenic galena). The |  | | Journal (article/letter/editorial) | | with quartz, phyllosilicates, organic matter, uraninite, gold, and base metal sulÂŽde minerals, showing...(Evander, West Rand, Carletonville, Klerksdorp, Welkom) across the Witwatersrand Basin show comparable...were basinwide events, rather than the result of local processes. Fluid inclusion data for the quartz indicates...mineralization in the Late Archaean Witwatersrand Basin, South Africa, remains a matter of high interest, but also... 690 Fig. 1 Map of Witwatersrand Basin, showing mine sites (KR Kinross; RF Randfontein; SH St. Helena; |  | | Journal (article/letter/editorial) | | FROM PRECAMBRIAN ROCKS OF THE WITWATERSRAND, SOUTH AFRICA D.K. H A L L B A U E R and K.T. VAN WARMELO...Laboratory, Chamber of Mines of South Africa, Johannesburg (South Africa) Department of Botany, Rand Afrikaans...Afrikaans University, Johannesburg (South Africa) (Accepted for publication May 16, 1974) ABSTRACT Hallbauer...from Precambrian rocks of the Witwatersrand, South Africa. Precambrian Res., 1: 199--212. Examination...Supergroup near Barberton in the Eastern Transvaal, South Africa (Pflug, 1966). These microorganisms, almost |  | England, Gavin L., Rasmussen, Birger, KrapezĚ, Bryan, Groves, David I. (2001) The Origin of Uraninite, Bitumen Nodules, and Carbon Seams in Witwatersrand Gold-Uranium-Pyrite Ore Deposits, Based on a Permo-Triassic Analogue. Economic Geology, 96 (8) 1907-1920 doi:10.2113/gsecongeo.96.8.1907 | Journal (article/letter/editorial) | | Geology Vol. 96, 2001, pp. 1907â1920 The Origin of Uraninite, Bitumen Nodules, and Carbon Seams in Witwatersrand...although the radiation-emitting detrital grains were uraninite. Carbon seams in Witwatersrand ore deposits are...migrated through primary porosity past detrital uraninite grains, but they differ from solitary nodules...observations that the Witwatersrand basin contained uraninite placers. Indeed, carbon seams are most likely...sites of heavy mineral uraninite strands. Given the chemical instability of uraninite under oxidizing conditions |  | | Journal (article/letter/editorial) | | photosynthesizers at around 3.0 Ga, the first âwhiffsâ of free oxygen produced by photosynthesis under an overall...University of Cape Town, Rondebosch, Cape Town 7701, South Africa e-mail: hartwig.frimmel@uni-wuerzburg.de Q....mineralization was indeed synsedimentary. Limited local remobilization of gold and other ore constituents...compared with average continental crust, average South African peridotite xenolith and Allende meteorite...and synsedimentary pyrite as well as detrital uraninite, whereas those younger than the GOE contain detrital |  | Reimold, W.U., Meshik, A.P., Smits, G., Pravdivtseva, O.V., Shukolyukov, Yu.A. (1995) Fission xenon dating of Witwatersrand uraninites: Implications for geological activity in the Central Kaapvaal Craton about 1 Ga ago. Geochimica et Cosmochimica Acta, 59 (24) 5177-5190 doi:10.1016/0016-7037(95)00354-1 | Journal (article/letter/editorial) | | revised form September 7, 1995) Abstract--Four uraninite separates from different reefs from in and above...Rand, West Rand, and Welkom Goldfields of the Witwatersrand Basin in South Africa. These samples were...Blyvooruitzicht Gold Mine, 1.043 _+ 0.024 Ga for the Basal Reef sample from Free State Geduld Gold Mine, 1.115 _...0.036 Ga for the Main Reef uraninite concentrate from Sub Nigel Gold Mine, and 1.300 _+ 0.058 Ga for...Ventersdorp Contact Reef sample from Kloof Gold Mine. No apparent ages in excess of 1600 Ma were observed |  | | Journal (article/letter/editorial) | | as depositsof proximal braided streams. On the local scale, good correlations exist between gold and...depositswithin sandstonebeds.Two well-mineralized local depositsare examinedin detail: a multistoriedgravel...alluvium in fluctuating flows comprisesa series of local "point sources" which individually may have concentratedor...dispersedheavy minerals in a previous event. Formation of local placer depositsthus dependsboth on the sorting mechanismsand...fluvial environment. lar placer horizon is governedby local hydraulic Broad bands of placers parallel to depositional |  | | Journal (article/letter/editorial) | | greenschist-facies sandstones from the Witwatersrand basin, South Africa Birger Rasmussen a,â, Janet R. Muhling b a b...conglomerate from the Witwatersrand Supergroup, South Africa, displays reaction textures indicating that...in the West Rand goldďŹeld and at 2.12 Ga in the Welkom goldďŹeld. Our results indicate that detrital igneous...conglomerates of the Witwatersrand Supergroup, South Africa. The results show that detrital monazite in...regional geology of the Witwatersrand basin, South Africa, and generalised stratigraphic column for the |  | | Journal (article/letter/editorial) | | margin of the Archaean Witwatersrand Basin of South Africa associated with regional greenschist facies...in producing gold deposits were the widespread local concentrations of C and Fe on unconformity surfaces...Sciences, University of Stellenbosch, Stellenbosch, South Africa 2 *Corresponding author, email neil@phillipsgold...model. Keywords: Gold, Witwatersrand, Archaean, South Africa, Metamorphism, Devolatilisation, Replacement...Origin of Witwatersrand gold 1 (A) Map of southern Africa showing the major Archaean cratons; the Witwatersrand |  | Guy, B. M., Ono, S., Gutzmer, J., Lin, Y., Beukes, N. J. (2014) Sulfur sources of sedimentary âbuckshotâ pyrite in the Auriferous Conglomerates of the Mesoarchean Witwatersrand and Ventersdorp Supergroups, Kaapvaal Craton, South Africa. Mineralium Deposita, 49 (6) 751-775 doi:10.1007/s00126-014-0518-3 | Journal (article/letter/editorial) | | and Ventersdorp Supergroups, Kaapvaal Craton, South Africa B. M. Guy & S. Ono & J. Gutzmer & Y. Lin & N...and Ventersdorp supergroups, Kaapvaal Craton, South Africa. Detailed petrographic analyses of the reefs...Johannesburg, Auckland Park, Johannesburg 2006, South Africa e-mail: bradley.guy@sgs.com J. Gutzmer Helmholtz-Institute...Services, SGS South Africa, 58 Melville Street, Booysens, Johannesburg 2091, South Africa Present Address:...ocean water would have essentially been sulfate-free (Habicht et al. 2002; Frimmel 2005). Previous authors |  | | Journal (article/letter/editorial) | | lily-liveredattemptat me- the Basalreef in the Welkom gold field yielded an diation between the hydrothermalists...observa- indicatethat roundcompactpyritesfrom the Welkom 20 Ma. These tionaldiscrepancies thatundoubtedlydo...Vaal reef, Klerksdorpgold field, 5 = Leader reef, Welkom gold field ⢠Number of samplesanalyzedin parentheses...Elliot Lake-BlindRiver depositswhere ca. 2550-Ma uraninite is hosted within 2350-Ma Witwatersrand basin...the contention that much, if not all, of the uraninite in the Witwatersrandbasinis alsodetrital in origin |  | | Journal (article/letter/editorial) | | the latter having critical implications for acid mine drainage and mineral processing (Evangelou and Zhang...diffraction (EBSD), are presented from a sample from the Welkom goldfield to establish the microstructural evolution...gold. The Central Rand Group rocks in the Welkom district have been metamorphosed at low greenschist...sample comes from the Welkom goldfield of the Witwatersrand basin, South Africa, a region where pyrite...mineralization. The structural evolution of the Welkom goldfield comprises east-verging thrust faults |  | | Journal (article/letter/editorial) | | Cape Town, South Africa 2 Department of Geology, University of Stellenbosch, South Africa With 6 Figures...(reefs) in the late Archaean Witwatersrand Basin, South Africa. These data, supplemented by oxygen isotope...in the late Archaean Witwatersrand Basin in South Africa is famous for hosting the world's largest known...evidently detrital morphology in the Basal Reef, Welkom goldfield (Minter et al., 1993), occurs within...28=8 ]Central I Rand Johannesburg ¢.O Loraine mine i ~ I ~ Bushveld IgneousComplex Central Rand |  | | Report (chapter) | | 2015 Development of the Witwatersrand Basin, South Africa M I K E R C O W A R D 1, R I C H A R D M. S...developed on already consolidated continental crust south of the Limpopo plate margin. It is a flexural basin...mountain belts. The Witwatersrand basin in South Africa (Figs 1 & 2) is important in the study of Early...Graham, this volume) or the sub-andean basins of South America. This paper aims to provide a stratigraphic...Imperial College and Gencor Mineral Resources of South Africa. New field mapping has been carried out in all |  | | Journal (article/letter/editorial) | | Palaeoproterozoic marine shales of the Kaapvaal Craton, South Africa Glen T. Nwaila 1,2 & Hartwig E. Frimmel 2...Witwatersrand, Private Bag 3, Johannesburg 2050, South Africa 2 Bavarian Georesources Centre (BGC), Institute...Sciences, University of Cape Town, Rondebosch 7700, South Africa and PGE content in modern seawater are extremely...cover successions of the Kaapvaal Craton in South Africa (Fig. 1). A large amount of geochemical data...Palaeoproterozoic marine shales of the Kaapvaal Craton, South... in the hinterland of the Witwatersrand Basin |  | | Journal (article/letter/editorial) | | of hydrocarbons in the Witwatersrand Basin, South Africa: evidence from bulk and molecular d13 C data...Sciences, UniĂersity of Cape Town, Rondebosch 7700, South Africa Received 13 July 1999; accepted 10 March 2000...conglomerates of the late Archean Witwatersrand Basin, South Africa, is often intimately associated with carbonaceous...spectrometry; Goldâuranium deposits; Witwatersrand; South Africa 1. Introduction ) Corresponding author. Tel... of the Late Archean Witwatersrand Basin in South Africa, the worldâs largest 0009-2541r01r$ - see front |  | | Report (chapter) | | reactivation and disruption: Witwatersrand Basin, South Africa S. J. J O L L E Y 1'2, G. W . S T U A R T 1...Johannesburg 2001, South Africa 4AngloGold, 11 Diagonal Street, Johannesburg 2001, South Africa 5AIS Norske...Australia 7Snowden Exploration Africa, PO Box 2613, Parklands 2121, South Africa This paper examines progressive...extensional deformation in the Witwatersrand Basin, South Africa. The results indicate that rapid extrusion of...within the region, but locally very rapid. As the local kinematic environment became extensional, the fault |  | Rantzsch, Ulrike, Gauert, Christoph D. K., Van der Westhuizen, Willem A., Duhamel, Isabelle, Cuney, Michel, Beukes, Gerhard J. (2011) Mineral chemical study of U-bearing minerals from the Dominion Reefs, South Africa. Mineralium Deposita, 46 (2) 187-196 doi:10.1007/s00126-010-0317-4 | Journal (article/letter/editorial) | | U-bearing minerals from the Dominion Reefs, South Africa Ulrike Rantzsch & Christoph D. K. Gauert & Willem...Dominion exploration areas near Klerksdorp, South Africa, were investigated for their mineral paragenesis...ore and heavy mineral assemblages consist of uraninite, other uraniferous minerals, Fe sulphides, NiâCo...chromite, magnetite and minor gold. Sub-rounded uraninite grains occur associated with the primary detrital... UâTi, UâTh minerals, pitchblende (colloform uraninite) and coffinite are of secondary, remobilised origin |  | Kositcin, Natalie, McNaughton, Neal J., Griffin, Brendan J., Fletcher, Ian R., Groves, David I., Rasmussen, Birger (2003) Textural and geochemical discrimination between xenotime of different origin in the Archaean Witwatersrand Basin, South Africa. Geochimica et Cosmochimica Acta, 67 (4) 709-731 doi:10.1016/s0016-7037(02)01169-9 | Journal (article/letter/editorial) | | origin in the Archaean Witwatersrand Basin, South Africa NATALIE KOSITCIN,1,* NEAL J. MCNAUGHTON,1 BRENDAN...siliciclastic rocks of the Archaean Witwatersrand Basin, South Africa, has been identified on the basis of petrography...xenotime from the Archaean Witwatersrand Basin, South Africa (Fig. 1). The origin of the xenotime analysed...Carletonville Goldfield; KGF ⍽ Klerksdorp Goldfield; WGF ⍽ Welkom Goldfield. tary rocks that represent lower, marine-influenced...Group. Debate persists as to whether the gold and uraninite were introduced as detritus (Minter et al., 1993; |
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