 | Oberthur, T., Weiser, T. W., Gast, L., Schoenberg, R., Davis, D. W. (2002) PLATINUM-GROUP MINERALS AND OTHER DETRITAL COMPONENTS IN THE KAROO-AGE SOMABULA GRAVELS, GWERU, ZIMBABWE. The Canadian Mineralogist, 40 (2) 435-456 doi:10.2113/gscanmin.40.2.435 | Journal (article/letter/editorial) | | DETRITAL COMPONENTS IN THE KAROO-AGE SOMABULA GRAVELS, GWERU, ZIMBABWE THOMAS OBERTHĂR§ Bundesanstalt fĂŒr...the Somabula gravels, a paleoplacer of Upper Karoo (Triassic, ~200 Ma) age near Gweru, Zimbabwe. The...in the Somabula placers comprises staurolite, zircon, monazite, columbiteâtantalite, cassiterite, chromite...derived from late Archean greenstone belts of the Zimbabwe craton. Keywords: zircon, monazite, tantalite...isotopes, paleoplacer, Karoo Formation, Somabula gravels, Gweru, Zimbabwe. SOMMAIRE Nous avons Ă©tudiĂ© des concentrĂ©s |  | | Journal (article/letter/editorial) | | ancestry for the Somabula diamond-bearing alluvial deposit, Central Zimbabwe Andy Moore Somabula Explorations...Explorations (Pvt) Limited, Box CH399, Chisipite, Harare, Zimbabwe. e-mail: andy.moore@info.bw John Moore Geology...conglomerates, located to the southwest of Gweru in central Zimbabwe, have long presented an enigma in terms...Although conglomerate units occur throughout the Somabula Karoo succession, the diamonds and associated...20 km to the southwest of Gweru, in the Somabula district in central Zimbabwe (Figures 1 and 2). The diamonds |  | | Journal (article/letter/editorial) | | Ijebu Series, has so far been found only in that district of the Lagos Province. These beds are extensively...might truly include the schists of the entire district. Typical specimens of the granites, pegmatites...last-named showed 67'77 per cent, of iron-peroxide. The district is compared with the Oban Hills of the Eastern...of Stannite and âąTetrahedrite, Valentinite, Cassiterite, Tourmaline, and Tourmalinehornfels, Fluor, Apatite...Sartorite by Dr. Trechmann. OOEEB8PO1TDENCE. THE SOMABULA DIAMOND FIELD. SIB,âI notice in your December |  | Melcher, Frank, Graupner, Torsten, GĂ€bler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, OberthĂŒr, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalumâ(niobiumâtin) mineralisation in African pegmatites and rare metal granites: Constraints from TaâNb oxide mineralogy, geochemistry and UâPb geochronology. Ore Geology Reviews, 64. 667-719 doi:10.1016/j.oregeorev.2013.09.003 | Journal (article/letter/editorial) | | NU 4.1.2. Congo Craton (DRC) 4.1.3. Zimbabwe Craton (Zimbabwe) 4.1.4. Kaapvaal Craton (South Africa)...Mineralogy 4.3.2. Kamativi Schist Belt (western Zimbabwe) 4.3.3. Orange River Pegmatite Belt (Namibia,...Birimian TE 5.1.4. Kaapvaal Craton D 5.1.3. Zimbabwe Craton 5.2.2. North-eastern DRC 5.3. Neoproterozoic...(Democratic Republic of the Congo), the Kamativi Belt (Zimbabwe) and the Jos Plateau (Nigeria). Mn-rich columbite-tantalite...late-orogenic (e.g., West African Craton, MA Zimbabwe Craton), post-orogenic (Kibara Belt, Damara Belt |  | Oberthur, T., Weiser, T. W., Melcher, F., Gast, L., Wohrl, C. (2013) DETRITAL PLATINUM-GROUP MINERALS IN RIVERS DRAINING THE GREAT DYKE, ZIMBABWE. The Canadian Mineralogist, 51 (2) 197-222 doi:10.3749/canmin.51.2.197 | Journal (article/letter/editorial) | | PLATINUM-GROUP MINERALS IN RIVERS DRAINING THE GREAT DYKE, ZIMBABWE Thomas OBERTHĂR§, Thorolf W. WEISER, Frank MELCHER...and PGE-oxides (unstable). Keywords: Great Dyke, Zimbabwe, alluvial sediments, Pt-Fe alloy, Os-Ir-Ru alloy...Bushveld Complex of South Africa, the Sudbury district in Canada, and later Norilsk in Russia came into...intrusions (Bushveld, South Africa; Great Dyke, Zimbabwe; Stillwater, USA) that host the overwhelming proportion...of knowledge on the Great Dyke of Zimbabwe. The Great Dyke of Zimbabwe constitutes the worldâs second largest |  | | Report (issue) | | interest in the geo logy and mineral resources of Zimbabwe which followed the removal of United Nations sanctions...original Bulletin is the insertion of Table IIIA, Zimbabwe Mineral Production and Value, on page 114A. Due...from the southern part of the craton up into the Midlands area and is everywhere overlain by a thick pile...at the Cotopaxi and Dickens mines in Victoria District in 1894, but it was not until the early l 900's...LARGE GOLD MINES Mine Geology and mineralization District Cam and Motor Gatooma Globe & Phoenix Que |  | | Journal (article/letter/editorial) | | 498. Barke, F., Carboniferous Limestone, Wrekin District, 384. Barnacles, Lepadid, Derivation of, J. M...Geology of Palestine, 286. Brown, J. Coggin, Cassiterite, Tavoy, India, 83 ; Tungsten Ores, 44. Brj'done...Wrekin District, L. M. Parsons, 77; F. Barke, 304. Carruthers, R. G., A new Coral, 436. Cassiterite, Tavov...and Pitcairn, 131. Maufe, H. B., Platinum in the Somabula Gravels, 520 ; Rhodesian Geology, 429. Maury,...Parsons, L. M., Carboniferous Limestone of Wrekin District, 77. Pascoe, E. H., Historj' of Indus, Brahmaputra |  | | Report (issue) | | Trail in Gilgit-Baltistan DUDLEY BLAUWET 58. Zimbabwe Blue Topaz: St. Anne's Mine JAN KANIS 60. Brazil:...Kleine Spitzkoppe, Namibia; Mokrusha Mursinka District, Ural Mountains, Russia; Paprok, Laghman Province... zinnwaldite, muscovite, columbite, rutile, cassiterite, euclase, hematite, hydroxyl-herderite, and lepidolite...greisens: quartz, muscovite, tourmaline, fluorite, cassiterite, ferberite huebnerite, scheelite, molybdenite...(Simmons et al., 1987). Other pegmatites in this district contain abundant primary fluorite but no topaz |  | Legros, HĂ©lĂšne, Mercadier, Julien, Villeneuve, Johan, Romer, Rolf L., Deloule, Etienne, Van Lichtervelde, Marieke, Dewaele, Stijn, Lach, Philippe, Che, Xu-Dong, Wang, Ru-Cheng, Zhu, Ze-Ying, Gloaguen, Eric, Melleton, JĂ©rĂ©mie (2019) U-Pb isotopic dating of columbite-tantalite minerals: Development of reference materials and in situ applications by ion microprobe. Chemical Geology, 512. 69-84 doi:10.1016/j.chemgeo.2019.03.001 | Journal (article/letter/editorial) | | No.239 pegmatite dike from the Dahe pegmatite district. This RI pegmatite is located in the eastern...synthetic oxides PT (MnTiO3, Fe2O3, LiNbO3, cassiterite, zircon, LiTaO3, scheelite, galena, ThO2, UO2)...Late Neoproterozoic RI overprinting of the cassiterite and columbite-tantalite bearing pegmatites of...detrital components in the Karoo-age Somabula gravels, Gweru, Zimbabwe. Canadian Mineralogist 40, 435â456...LAâICPâMS UâPb dating of columbite-(Fe) PT E and cassiterite. Ore Geology Reviews, in press. Zhang, A.C., |  | | Journal (article/letter/editorial) | | Bushveld Complex in South Africa, the Sudbury district in Canada, and later Norilsk in Russia § came...Bushveld Complex in South Africa or the Great Dyke in Zimbabwe have not been identiïŹed (Wagner 1929, Cabri et...rivers along the Great Dyke, and in the Somabula gravels, Zimbabwe. 8th International Platinum Symposium...platinum-group minerals in rivers draining the Great Dyke, Zimbabwe. Canadian Mineralogist 51, 197â222. OBERTHUÌR...focus on platinumgroup minerals and remarks on cassiterite, columbite-group minerals, and uraninite. International |  | Stribrny, B., Wellmer, F. -W., Burgath, K. -P., OberthĂŒr, T., Tarkian, M., Pfeiffer, T. (2000) Unconventional PGE occurrences and PGE mineralization in the Great Dyke: metallogenic and economic aspects. Mineralium Deposita, 35 (2) 260-280 doi:10.1007/s001260050019 | Journal (article/letter/editorial) | | initial production from mines in the Great Dyke of Zimbabwe has yielded 2.1 t Pt. The remaining 9.54 t are...Russia Stillwater, USA Sudbury, Canada Great Dyke, Zimbabwe Kupferschiefer, Poland Bregu i Bibes, Albania...production, for example those of the Great Dyke, Zimbabwe, ± potential alternatives in the form of unconventional...mineralizations PGE in layered intrusions: the Great Dyke, Zimbabwe Geological setting The ca. 2.58-Ga-old Great Dyke...cuts Archean granites and greenstone belts of the Zimbabwe craton (Worst 1960). In its present level of erosion |  | | Journal (issue) | | Update on Emeralds from the Sandawana Mines, Zimbabwe J.C. (Hanco) Zwaan, Jan Kanis, and Eckhard J.... UPDATE ON EMERALDS FROM THE SANDAWANA MINES, ZIMBABWE By J. C. (Hanco) Zwaan, Jan Kanis, and Eckehard...is believed by some that the area now known as Zimbabwe was the fabled land of Ophir, which produced gold...contributed to emerald formation in this part of Zimbabwe, but it also offers new data on the distinctive...geographers had referredâin the interior of what is now Zimbabwe, near Hartley (now Chegutu). Subsequently, after |  | | Journal (issue) | | the writer in r9r9 in the Triassic gravels of Somabula. Gorceixite was originally described by E. Russak...The following description was published of the Somabula material : 2 '' ' Beans.' A very interesting constituent...Geology of the Diamond-bearing Gravels of the Somabula Forest by A. M. , Macgregor ; Southern Rhodesia...streaky in dark cream and cafe.-au-lait colours. The Somabula gravels have not been worked during the last twelve...within the Rhodesian Stor1nberg series. 1 In the Somabula Forest the diamond-bearing wash rests upon the |  | | Journal (article/letter/editorial) | | Unst, Shetland, '54, 399 Amisk-Athapapuskow Lake District, '20, (R) 282 Ammonite, new Name for Lias, D....Hemisphere, '39, 489 Jurassic Iron Ores, Cleveland District, '42, (R) 207 ; Chloride Waters of Great Britain...Perthshire, Unusual, W. T. Harry, '52, 41 Appleby District, Geology of, '15, (R) 431 ; '42,(R)78; '52, (R)...70 Assynt Culmination, E. B. Bailey, '35, 151 â District, Geological Excursion Guide, '38, (R) 140 â Mountains... Geological, Photographic, '13, (R) 424 Atlin District, British Columbia, '14, (R) 129 Atmospheric Erosion |  | | Book | | Kingdom 193 United States of America 194 Zaire 203 Zimbabwe 203 Index 205 Preface When Peter Read asked...Brazil, Sri Lanka; Jos plateau, Nigeria; Volyn district, Ukraine, and numerous pegmatites throughout the...surprising, as he was familiar with the Saxon tin district which contains yellow topaz. An interesting description...up to 0.9 m long from the Ribaue-Alto Ligonia district of Mozambique that probably weigh over 100 kg... A 117 kg crystal was obtained from the Volyn district, Ukraine in 1966 (Milovsky and Kononov, 1985) |  | | Journal (article/letter/editorial) | | earth-mud flow bearing a colluvial ânigrineâ and cassiterite accumulation evolved perpendicular to the thalweg...rare-element pegmatites [1,61,74]. They accompany cassiterite and wolframite in granite-related SnâW deposits...eluvial in the Rondonia tinwith beveled mining district, Brazil.detrital topaz from eluvial placer deposits...Rondonia tin mining edges, Brazil. (c) Anhedral district, Brazil. Two processes, tectonic uplift and unroofing...gravel beds in the upper Karoo are operated at Somabula, Zimbabwe, not only for diamonds, but also for topaz |  | | Journal (issue) | | particularly in the Galle District of the former and the Colombo District of the latter Province. The...and also in the north of Sylhet. In the former district the seedlings are raised in beds, and transplanted...and pre paration studied. 11 Arriba " Cocoa District The Republic of Ecuador is reported to contain...and " Esmiraldas ," names synonymous with the district in which they are produced or the port from which...reliable rainfall statistics for the I I Arriba " district, but he was informed that from 1-fay to October |  | | Report (issue) | | platinum-bearing gravels, chiefly in the Urals and the Chooo district of Colombia ; but in recent years Tasmanian osmiridium...from nickel-copper matte produced in the Sudbury district of Onta,r io. It was not until 1919 that any a...be found in payable quantities. In the Gwelo district,* platinum has been found in the '' Great Dyke...o ughout the territory. As occu1Ting i11 that district, about 6 miles north-east of Indiva siding, the...proved to occur in the diamondbearing gravels of Somabula Forest, near Willoughby's siding, abo11t 12 miles |  | | Report (issue) | | deposits of rich âąd iamantiferous grav.els in th,e district around Akwatia, which is 5 miles S.E. of· Kade...Foting·aia., 6Âœ miles N.N.W. of Jajma in the Kono district, a11d there was a find near Kennema in 1931. The...the Kambui hills nea.r Kennema and Lago, Kennema district. Small frag·ments of ruby and sma,11 zircon crystals...quantities. Alluvia.I diamond was discovered in the Somabula fore.st west of Gwelo in 1903. The stones occur...S. Rhodesia for the year 1915 (1916), pp. 2-5. Somabula diamond fields of Rhodesia, by F. P. Mennell; |  | | Journal (article/letter/editorial) | | Carlinite Carnallite Carnotite Carrolite Cascandite Cassiterite Cattierite Cavansite Celadonite Celestite Celsian...siliciclastic rocks. In places, these minerals such as cassiterite, monazite or gold are concentrated in beds of...Chromium deposits of this type in South Africa and Zimbabwe contribute to more than 90% to the world supply...subtypes (Bushveld, South Africa, Great Dyke, Zimbabwe, Muskox, Canada, Dore Lake, Australia, Campo Formoso...South Africa (Fe, Cr, and PGE) and the Great Dyke, Zimbabwe (Cr, PGE/PGM) in idealized cross sections and | | | Journal (article/letter/editorial) | | Carlinite Carnallite Carnotite Carrolite Cascandite Cassiterite Cattierite Cavansite Celadonite Celestite Celsian...siliciclastic rocks. In places, these minerals such as cassiterite, monazite or gold are concentrated in beds of...Chromium deposits of this type in South Africa and Zimbabwe contribute to more than 90% to the world supply...subtypes (Bushveld, South Africa, Great Dyke, Zimbabwe, Muskox, Canada, Dore Lake, Australia, Campo Formoso...South Africa (Fe, Cr, and PGE) and the Great Dyke, Zimbabwe (Cr, PGE/PGM) in idealized cross sections and |  | | Book (edition) | | Ceylon. Rhodesia, and S.W. Africa: Sri Lanka, Zimbabwe, and Namibia, respectively. However, although...pink peach peach Brazilianite yellow-green Cassiterite light brown yellow Calcite dark brown-orange...2 USSR USSR 51 -38.8 Asbestos, 44 14.4 Zimbabwe Colombia Illinois 3.3 -20.2 14.8 7 3 18.4... Michigan. Domeykite Superior is from the district, Mohawk Mine, Michigan; Lake Ontario, Canada;...Tintic, Utah; Arizona; New Mexico; Coeur d'Alene district, Idaho. Hill, = 1 Anglesite gems are colorless |  | | Book | | yellow ,·arictv and alcxandrile. arc known from the Somabula diamond gra,·cls and f ro m the Fon Victoria an...been reco\'en:d from the 1 riassic gravels of Somabula. and its source may well have been in pcgmat itcs...ruby and sapphire, since the source nr those from Somabula has not yet been traced. KAOLIN: Kaolins arc known...or the K am a t i v i i n l ie r in the \Vankie District, there is again a s i m i l a r as ·ociation or...the h i g h grade regional metamorphism of the district. There is clear evidence that the metamorphism |  | | Book (edition) | | dept. (departement), dept. (departamento), dist. (district). Less common terms are not abbreviated, e.g....Noua, Banat, Romania. Also abundant at Bikita, Zimbabwe, where allophane and bikitaite are late hydrothermal...and at Sakangyi, Katha dist., Myanmar. At Mtoko, Zimbabwe, at Muiane, Alto Ligonha dist., Mozambique, and...Czech Rep., in grains to 15 cm. It accompanies cassiterite in apical albititic leucogranite copula at Montebras...Its optical properties approach to those of cassiterite. Pale gray, with visible anisotropy. R = 11-14 |  | | Journal (volume) | | 56 (p.t.) as Precipitant (p.t.) H. Mining District W. Turner {.c.l.) Amalgamated Properties v...Wolfram) Mount Lassen {c.l.) Turner, H. Altai Mining District (c.l.) '226 277, 3.38 173 9 116 *263 *226 52...from the Mountain province, where the Benguet district will soon increase its output, as a new 10-stamp...and has the The cost lowest working cost in the district. quoted is that chargeable to the tonnage from...sound in and sale of the lead output of the district, amounting to about 200,000 tons per year, will |
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