 | 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) | | Mineral chemical study of U-bearing minerals from the Dominion Reefs, South Africa Ulrike Rantzsch & Christoph...Neo-Archean Dominion Reefs (~3.06 Ga) are thin meta-conglomerate layers with concentrations of U- and Th-bearing...overlying Witwatersrand Reefs. Ore samples from Uranium One Africaâs Rietkuil and Dominion exploration areas...areas near Klerksdorp, South Africa, were investigated for their mineral paragenesis, texture and mineral...The ore and heavy mineral assemblages consist of uraninite, other uraniferous minerals, Fe sulphides, NiâCo |  | | Journal (article/letter/editorial) | | Ireland Evidence for the extreme age of certaih minerals from the Dominion Reef conglomerates and the underlying...composition of galenas from the Witwatersrand indicated the existence of a hypothetical âparentâ uraninite in...expulsion of radiogenic lead later in its history. New age data are presented here for samples of âtotal...rockâ, and purified detrital monasite, from the Dominion Reef conglomerates which lie below the Witwatersrand...evidence that radioactive minerals in the Dominion Reef have an age of crystallization close to 3100 million |  | | Report (issue) | | Genesis of Uraniun1- and Gold-Bearing Precan1brian Quartz-Pebble Congloinerates Proceedings of a Workshop...S I O N A L P A P E R I I 6 I - A - BB GENESIS OF URANIUM- AND GOLD-BEARING PRECAMBRIAN QUARTZ-PEBBLE...specimens of quartz-pebble conglomerate uranium ore. Both actual size. A2 A. AB Reef, Denison Mine, Elliot...(Samples courtesy of V. Ruzicka, photography by David M. Watson, both Geological Survey of Canada.) 1. Photograph...distribution of quartz pebbles; fine-grained pyritiferous matrix concentrated in upper two-thirds of photograph |  | | Journal (article/letter/editorial) | | lead agea of the olded mom&es The convergent and ursninites L. H. AHXENS Department of Geology and...1-d-w distribution (@&?, 8% 448. and #J) of three qmcimeua of Rhode&n monazite form a regular pattern...uwd for a pracinion wtimate of age-the cowqe& ages. The convergent ege of euoh Rhodaaien monasite in estiited...estiited at 2,680 x 1W yearn. The lead-age dktributions of monazite from Ant&&e. Medag~~r, end ureninite ftom...Huron Claim,aoath-ea&mManitobs, fit an extension of Rhodaebnage patternoloeely ) andhemoe theirconvergent |  | | Journal (article/letter/editorial) | | Responsible for the Concentration of Gold in the Early Precambrian of Southern-Africa R. P. VILJO~N*, R. SAAGER**...D e p a r t m e n t of Geology, University of Witwatersrand, Johannesburg, South Afrika ** Vancouver...The important gold deposits of the early Precambrian of Southern Africa are confined to two main geologic...environments. The source of the gold and modes of concentration in each of these environments are discussed...discussed. The first is comprised of the ancient granite-greenstone terrains of the Rhodesian and Kapvaal cratons |  | | Journal (article/letter/editorial) | | Lead isotopic composition of galenas from the Witwat~~rand and Orange Free State, and their relation...relation to the Witwatersrand and Dominion Reef uraniuites A. J. BURGER,* L. 0. NICOLATSEX~ and J. W. L. DE VII...the Orange Free State. Certain of the galenas have large proportions of radiogenic lead, and one sample...from the St. Helena mine contains a spectacular variation in the proportions of the lead isotopes within...The addition of radiogenie lead to these galenas is probably complementary to the loss of radiogenic lead |  | | Journal (article/letter/editorial) | | homepage: www.elsevier.com/locate/apgeochem Uraninite chemistry as forensic tool for provenance analysis...Georesources Centre, Institute of Geography and Geology, University of WĂŒrzburg, Am Hubland, D-97074 WĂŒrzburg...Department of Geological Sciences, University of Cape Town, Rondebosch 7701, South Africa c GeoZentrum...GeoZentrum Nordbayern, University of Erlangen-NĂŒrnberg, Schlossgarten 5a, D-91054 Erlangen, Germany b a r t...individual uraninite grains from several localities worldwide, representing a variety of different U-deposit |  | | Journal (article/letter/editorial) | | Vaal Reef placer was depositedduring the Vaal Stage of the Upper Witwatersrand System,approximately2,500...stratiformdepositis up to 5 feet thick and coversan area of over 100 squaremiles. It was discoveredin 1934 and...adjacentgold mineswhich produceapproximately16 percent of SouthAfrica's total goldoutput. This studyintegratesstratigraphical...petrological,and mineralogicaldata with a comprehensive set of sedimentological data to synthezisea model that describes...inducedan entry point. The sedimentsin the footwall of the Vaal Reef placer regressedinto the depositorydown |  | DepinĂ©, 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...systematic analyses of the trace and rare earth element (REE) distribution in uraninite from various gold-bearing...gold-bearing conglomerates of the Mesoarchaean Central Rand Group in South Africaâs Witwatersrand Basin...placer origin for the uraninite and a magmatogenic provenance thereof. The chemistry of commonly rounded to...to sub-rounded uraninite is highly variable from grain to grain but generally marked by elevated Th, |  | Hofmann, Axel, Bekker, Andrey, Rouxel, Olivier, Rumble, Doug, Master, Sharad (2009) Multiple sulphur and iron isotope composition of detrital pyrite in Archaean sedimentary rocks: A new tool for provenance analysis. Earth and Planetary Science Letters, 286 (3) 436-445 doi:10.1016/j.epsl.2009.07.008 | Journal (article/letter/editorial) | | l Multiple sulphur and iron isotope composition of detrital pyrite in Archaean sedimentary rocks: A...School of Geological Sciences, University of KwaZulu-Natal, Durban, South Africa Department of Geological...Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2 Geophysical Laboratory, Carnegie...School of Geosciences, University of the Witwatersrand, Wits 2050, Johannesburg, South Africa b c a...isotope analyses of rounded pyrite grains from 3.1 to 2.6 Ga conglomerates of southern Africa indicate their |  | | Journal (article/letter/editorial) | | Federal Republic of Germany U-Ti Phases from Precambrian Quartz-Pebble Conglomerates of the Elliot Lake...Lake Area, Canada, and the Pongola Basin, South Africa R. Saager and H. D. Stupp With 10 Figures Received...accepted May 17, 1983 D e d i c a t e d to Professor Dr. J o s e f Z e m a n n on the occasion o f his 6...Elliot Lake area, Canada, and the Pongola basin, South Africa, were identified by ore microscopy. This observation...the fact that U-Ti phases are second only to uraninite as the most important uranium minerals in Precambrian |  | | Journal (article/letter/editorial) | | INVITED PAPER First whiffs of atmospheric oxygen triggered onset of crustal gold cycle Hartwig E....Springer-Verlag Berlin Heidelberg 2015 Abstract Lack of a suitable gold source has long been regarded as...1.8 Ga, we propose that the primary concentration of gold in the continental crust resulted from atmospheric...surface (orders of magnitude greater than todayâs) was a consequence of the chemistry of the Mesoarchaean...photosynthesizers at around 3.0 Ga, the first âwhiffsâ of free oxygen produced by photosynthesis under an overall |  | Fuchs, S., Schumann, D., Williams-Jones, A.E., Vali, H. (2015) The growth and concentration of uranium and titanium minerals in hydrocarbons of the Carbon Leader Reef, Witwatersrand Supergroup, South Africa. Chemical Geology, 393. 55-66 doi:10.1016/j.chemgeo.2014.11.018 | Journal (article/letter/editorial) | | growth and concentration of uranium and titanium minerals in hydrocarbons of the Carbon Leader Reef, Witwatersrand...Supergroup, South Africa S. Fuchs a,â, D. Schumann b,c, A.E. Williams-Jones a, H. Vali d a Department of Earth...Ottawa, ON K2E0B9, Canada c Department of Earth Sciences, University of Western Ontario, London, ON N6A 5B7...Keywords: Bitumen Oil as an oreïŹuid Nanoparticles Uraninite Anatase Witwatersrand a b s t r a c t Uranium...Carbon Leader Reef in the Witwatersrand Basin, South Africa, was investigated by high-resolution transmission |  | | Report (issue) | | IN PROTEROZOIC QUARTZ-PEBBLE CONGLOMERATES REPORT OF THE WORKING GROUP ON URANIUM GEOLOGY ORGANIZED BY...Austria September 1987 PLEASE BE AWARE THAT ALL OF THE MISSING PAGES IN THIS DOCUMENT WERE ORIGINALLY...normally maintain stocks of reports in this series. However, microfiche copies of these reports can be obtained...accompanied by prepayment of Austrian Schillings 100,in the form of a cheque or in the form of IAEA microfiche...significantly to our knowledge of uranium geology and the nature of uranium deposits. Much of the information that |  | | Report (issue) | | STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY PRINCIPAL URANIUM DEPOSITS OF THE WORLD By V. P... Purpose and scope of report............................. Global distribution of deposits................................. Parallelism of Precambrian iron and uranium deposits.... Uranium provinces and districts...districts......................... Type of deposit......................................... Page 1 2........... Size of deposits and districts............................... Description of localities.... |  | 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) | | Pergamon 0016-7037(95)00354-1 Fission xenon dating of Witwatersrand uraninites: Implications for geological...Geology Research Unit and Department of Geology, University of the Witwatersrand, Private Bag 3, P.O...2Vemadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 117975 Moscow...September 7, 1995) Abstract--Four uraninite separates from different reefs from in and above the Central...the East Rand, West Rand, and Welkom Goldfields of the Witwatersrand Basin in South Africa. These samples |  | | Journal (article/letter/editorial) | | Simplification of a complex system of geochemicalvariables, obtained from an auriferousore horizon of the Witwatersrand...terms of three theoreticalvariablesor factors. The factors indicate that the gold and the uraninite in the...resultswith the well-established modifiedplacer theory of the genesisof the Witwatersranddepositdemonstrates...been published,one by Hiemstra fine-grainedmatrix of quartzand micaceous minerals. (1967) who studiedthe...studiedthe contentsof certaintrace ele- The thickness of the Basal Reef varies between 3 mentsin the DominionReef |  | | Journal (article/letter/editorial) | | ORIGIN OF URANIFEROUS CONGLOMERATES AT ELLIOT LAKE, CANADA AND WITWATERSRAND, SOUTH AFRICA: IMPLICATIONS...N A T M O S P H E R E D.E. GRANDSTAFF Department of Geology, Temple University, Philadelphia, PA 19122... Origin of uraniferous conglomerates at Elliot Lake, Canada and Witwatersrand, South Africa: Implications...atmosphere. Precambrian Res., 13: 1--26. Although uraninite is thermodynamically unstable at oxygen pressures...kinetics suggest that uraninite from the Witwatersrand Sequence, South Africa may have survived as a |  | | Journal (article/letter/editorial) | | Characteristics of Gold Particles from Recent River Deposits and the Fossil Placers of the Witwatersrand...r MiningTechnology Laboratory, Chamber of Mines of South Africa, Johannesburg A relationship has been...established between morphological features and fineness of gold particles and the distance over which they have...deposits, such as the rivers of the Barberton Mountain Land, South Africa and the river Rhine in Germany...deposits it was possible to estimate the distance of transport for the Witwatersrand gold, which in most |  | Grandstaff, D.E, Edelman, M.J, Foster, R.W, Zbinden, E, Kimberley, M.M (1986) Chemistry and mineralogy of Precambrian paleosols at the base of the Dominion and Pongola Groups (Transvaal, South Africa) Precambrian Research, 32 (2) 97-131 doi:10.1016/0301-9268(86)90003-3 | Journal (article/letter/editorial) | | MINERALOGY OF PRECAMBRIAN PALEOSOLS AT THE BASE OF THE DOMINION AND PONGOLA GROUPS (TRANSVAAL, SOUTH AFRICA)...~Department of Geology, Temple University, Philadelphia, P A 19122 (U.S.A.) 2Department of Geological...Earth, and Atmospheric Sciences, P. 0. Box 8208, North Carolina State University, Raleigh, NC 27650 (U...mineralogy of Precambrian paleosols at the base of the Dominion and Pongola Groups (Transvaal, South Africa)...found between sedimentary rocks of the (lowest Proterozoic) Dominion and (Archean) Pongola Groups and |  | | Book (edition) | | 29 se wWi> ey oc =u if OF THE REPUBLIC ee tiecann UES COVER: TAPESTRIES. DEPICTING DIAMOND IRON...BY JO AND ERNEST ULLMANN DISPLAYED IN THE âMUSEUM OF THE GEOLOGICAL SURVEY, PRETORIA. b) VANAF 1/4/1980...DEPARTMENT OF OF SOUTH AFRICA MINES GEOLOGICAL SURVEY MINERAL RESOURCES OF REPUBLIC OF THE SOUTH...SOUTH AFRICA FIFTH EDITION HANDBOOK 7 Edited by C. B. Coetzee, M.Sc., Ph.D. COPYRIGHT RESERVED 1976...verkrygbaar in Afrikaans i 40509-1 Street, DEPARTMENT OF MINES Secretary W. P. Viljoen, B.A. GEOLOGICAL |  | | Book | | Tables Springer-Verlag Berlin Heidelberg GmbH Prof. Dr. Franz J. Dahlkamp OlbergstraBe 10 D-5307 Wachtberg...Wachtberg Germany ISBN 978-3-642-08095-1 Library of Congress Cataloging in Publication Data Dahlkamp, Franz...part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations...Duplication of this publication or parts thereof is permitted only under the provisions of the German...German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained |  | | Journal (article/letter/editorial) | | TH GEOCHEMISTRY OF THE ARCHAEAN CONTINENTAL CRUST OF THE KAAPVAAL CRATON, SOUTH AFRICA THOMAS O. REIMER...Th geochemistry of the Archaean continental crust of the Kaapvaal Craton, South Africa. Precambrian Res...and igneous rocks of the Kaapvaal Craton have been used to trace the occurrence of highly fractionated...Eu-anomalies back to the early Archaean. From the sediments of the Fig Tree Group (about 3.4 Ga-old) and granite...metamorphic part of the continental crust at that time already contained up to about 35% of such granites |  | Frimmel, H. E., DepinĂ©, M., Emsbo, P., Koenig, A. E., Kern, M. (2013) Reply to comments by T. OberthĂŒr on âTrace element distribution in uraninite from Mesoarchaean Witwatersrand conglomerates (South Africa) supports placer model and magmatogenic sourceâ. Mineralium Deposita, 48 (8) 1051-1053 doi:10.1007/s00126-013-0487-y | Journal (article/letter/editorial) | | distribution in uraninite from Mesoarchaean Witwatersrand conglomerates (South Africa) supports placer...2013) on the chemistry of uraninite grains from the auriferous conglomerates of the Mesoarchaean Witwatersrand...Supergroup, OberthĂŒr (2013) highlights a number of points, some of which had not been fully discussed by us...expand on some of the implications of our new data in this discussion here. The abundance of major and minor...minor elements in uraninite from the Witwatersrand has been the subject of several previous studies. We |  | 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) | | Sulfur sources of sedimentary âbuckshotâ pyrite in the Auriferous Conglomerates of the Mesoarchean Witwatersrand...and Ventersdorp Supergroups, Kaapvaal Craton, South Africa B. M. Guy & S. Ono & J. Gutzmer & Y. Lin & N...grains, are a characteristic feature of the auriferous conglomerates (reefs) in the Witwatersrand and Ventersdorp...Craton, South Africa. Detailed petrographic analyses of the reefs indicated that the vast majority of the...the buckshot pyrite grains are of reworked sedimentary origin, i.e., that the pyrite grains originally formed |
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