 | | 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...a small proportion of idiomorphic crystals of staurolite (the dominant heavy mineral phase, with a distal |  | | Journal (issue) | | Geological Society of Zimbabwe G Z S Newsletter October 2015 No. 3 of 3 of 2015 Heavy mineral concentrate...concentrate (Total weight 4.974g) from the Somabula alluvial deposit. One diamond crystal (octahedron/dodecahedron)...alexandrite, sapphires, garnet, amethyst, topaz (“Somabula blue” and white), aquamarine, boart and native...Society of Zimbabwe, P.O. Box CY 1719, Causeway, Harare Geological Society of Zimbabwe Newsletter ... ARTICLES AND REPORTS A Review of Diamonds in Zimbabwe – a Century On .............................. |  | 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 OBERTHÜR§ Bundesanstalt für...the Somabula gravels, a paleoplacer of Upper Karoo (Triassic, ~200 Ma) age near Gweru, Zimbabwe. The...spectrum of heavy minerals in the Somabula placers comprises staurolite, zircon, monazite, columbite–tantalite...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 étudié des concentrés |  | | Journal (article/letter/editorial) | | BRODERICK .\W^ D. PI.OWES 65 Landscape evolution in Zimbabwe from the Permian to present, with implications...Grahanistown. Somabula Explorations (Pvt.) Limited, Box CH399. Chisipite. Harare. Zimbabwe. e-mail: andy...Broderick 19 Jenkinson Road, Chisipite, Harare. Zimbabwe e-mail: makari@zol.co.zw D. Plowes 49 Arcadia...is presented to model drainage evolution -Acmss Zimbabwe since ihe Fenniiin. TÍii.s provides the framework...to the nortii and south oí' the modern central Zimbabwe watershed, wliich separates the Zambezi and Limpopo |  | | Journal (issue) | | Geological Society of Zimbabwe Newsletter June, 2007 Geological Society of Zimbabwe Newsletter June 2007...SOCIETY OF ZIMBABWE, P.O. BOX CY 1719, CAUSEWAY, HARARE Geological Society of Zimbabwe Newsletter ...Department, University of Zimbabwe ………………………………………. 22 The Geological Survey of Zimbabwe …………………………………………………...…………………………………………………… …. 31 2 Geological Society of Zimbabwe Newsletter June, 2007 Editorial At last we have...collective predicament as geologists and miners in Zimbabwe, 2007. Let us take note and work towards solving |  | | Journal (article/letter/editorial) | | EVOLUTION OF THE ZAMBEZI-LIMPOPO WATERSHED, CENTRAL ZIMBABWE A.E. MOORE African Queen Mines Ltd., Box 66 Maun...Zambezi-Limpopo drainage divide in the vicinity of Bulawayo, Zimbabwe, led to the recovery of a suite of ilmenites with...watershed. The ilmenite geochemistry eliminates other Zimbabwe Kimberlites as potential sources of these pathfinder...The inner drainage divide (the Ovambo-Kalahari-Zimbabwe or OKZ Axis) was initiated in the late Palaeogene...EVOLUTION OF THE ZAMBEZI-LIMPOPO WATERSHED, CENTRAL ZIMBABWE Figure 1. SRTM digital elevation image for southern |  | | Journal (article/letter/editorial) | | The Somabula Forest Diamond Field Southern Rhodesia M. C. B The Somabula Forest diamond placers are...workings. The oldest mine of importance in the Somabula area is the Shamrock Gold Mine to the north of...for gold led to the discovery of diamonds on the Somabula Spruit in 1Ç)03 by H. R. Moir and his brother...diamonds on the Vaal River and finding "blacks" (staurolite) in his pan carefully prospected the area around...abundant black mineral in the concentrates as staurolite in 1907. In 1914 Wagner concluded the diamonds |  | | Journal (article/letter/editorial) | | Sartorite by Dr. Trechmann. OOEEB8PO1TDENCE. THE SOMABULA DIAMOND FIELD. SIB,—I notice in your December...issue ' a comment by Dr. Flett on my paper on the Somabula Diamond Field, and I take this opportunity of...mineral locally regarded as enstatite is really staurolite. It did not occur to me to doubt the original...with faces showing the characteristic angles of staurolite. Andalusite may also be added to the list of...same specific gravity as chrysoberyl, topaz, and staurolite, the quantit}7 of these latter has no relation |  | | Journal (article/letter/editorial) | | Ijebu Series, has so far been found only in that district of the Lagos Province. These beds are extensively...and grits altered into garnet, andalusite, and staurolite-schists, and hornfels, with the development of...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...Sartorite by Dr. Trechmann. OOEEB8PO1TDENCE. THE SOMABULA DIAMOND FIELD. SIB,—I notice in your December |  | | Journal (article/letter/editorial) | | phonolite at Maid Gharian, near Tripoli. THE SOMABULA DIAMOXD FIELD. SIB,—Some months ago Sir John Willoughby...obtained by Mr. Mennell and given in his paper on the Somabula diamond field in the October number of the GEOLOGICAL...absent from all the collections which I have seen. Staurolite, on the other hand, which he does not mention...The angles, however, agree well with those of staurolite. A curious fact is that no cross twins, so characteristic...that kyanite is so abundant, the presence of staurolite is exactly what might be expected. Mr. Mennell |  | | 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) | | after a review of all the facts, firstly, that the Somabula diamonds, as also those of Brazil, India, and...from that of the sapphire, topaz, chrysoberyl, staurolite, kyanite, etc., with which they are associated...is one to advise them to look for diamonds in staurolite or kyanite schists ? Some, through ignorance...any diamonds. I even know of a locality where staurolite, kyanite, tourmaline, garnet, and rutile can |  | | Journal (article/letter/editorial) | | few of the intensely sheared rocks of such a district, except very locally--a few yards, for instance...Rifle Kopje, near Bulawayo; Red Hills, Victoria district). In other cases they occur as well-marked dykes...sequence. I t is in the somewhat remote Lomagundi district that these beds have attracted most attention...beds in the course of two lengthy visits to the district, and have recently paid i I have to express my...present day, which are intrusive. In the Abercorn district, also in Northern ]Kashonaland, and possibly on |  | Barkov, A. Y., Martin, R. F., Fleet, M. E., Nixon, G. T., Levson, V. M. (2008) New data on associations of platinum-group minerals in placer deposits of British Columbia, Canada. Mineralogy and Petrology, 92 (1) 9-29 doi:10.1007/s00710-007-0192-6 | Journal (article/letter/editorial) | | along the Swift River): almandine, chromite, staurolite, pyrite, diopside, scheelite and goethite; sample...Government Creek): hematite, almandine, epidote, staurolite, chromite, kyanite, scheelite, pyrite, rutile...detrital components in the Karoo-age Somabula gravels, Gweru, Zimbabwe. Can Mineral 40: 435–456 Rudashevsky |  | | Journal (article/letter/editorial) | | successions are noted, viz. 12 km in the Bulawayo District (Amm, 1940), 24 km at Hunters Road, Gwelo (Macgregor...2), from extremely low grades typical o f t h e midlands region, to highest grades that circumscribe and...Incipient duality of metamorphism is suggested by staurolite and kyanite-bearing assemblages reported from...pre-Shamvaian rocks. The lowest grades are typical of the Midlands region whereas metamorphism increases through...are of the amphibolite facies in which kyanite, staurolite, cordierite, anthophyllite, fuchsite, hornblende |  | | Journal (article/letter/editorial) | | and cordierite are common. Still farther afield staurolite, kyanite, and garnet become frequent in the north...Wagner, "The Geology of a Portion of the Belingwe District," Trans. Geol. Soc. of S.A., xvii, 1914, 39-54...Gravels of the The Red Rock at Hunstanton. 29 Somabula Forest," S.R.G.S. Bulletin, No. 8, pp. 13-14; |  | | Report (issue) | | deposits of rich •d iamantiferous grav.els in th,e district around Akwatia, which is 5 miles S.E. of· Kade...the heavy minera.ls in the concentrates (mainly staurolite and ilmenite, with some rutile, leucoxene, tourn1aline...Foting·aia., 6½ 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 |  | | Report (volume) | | P. H. G. M. Tectono-magmatic evolution of the Zimbabwe Craton 135 151 183 Constraints on the Archaean...Stable isotopes in the Archaean Belingwe belt, Zimbabwe: evidence for a diverse microbial mat ecology...propose a tectono-magmatic evolution model for the Zimbabwe craton. The third section contains papers concerned...broad, and looks back to a meeting in Harare, Zimbabwe 50 years ago when Fermor and A. M. Macgregor explored...http: //www.ciw.edu/kaapvaal). The Kaapvaal and Zimbabwe Cratons of southern Africa form one of the pre-eminent |  | | 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 — District, Geological Excursion Guide, '38, (R) 140 — Mountains... Geological, Photographic, '13, (R) 424 Atlin District, British Columbia, '14, (R) 129 Atmospheric Erosion |  | | 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...(Simmons et al., 1987). Other pegmatites in this district contain abundant primary fluorite but no topaz...Kleine Spitzkoppe NYF-pegmatites in the Swakopmund District of Namibia have been known to produce nearly perfect:...with a large central cavity Murzinka (Alabashka) district, central U ral Mountains, Russia Gunther Neumeier |  | | Journal (article/letter/editorial) | | 31]. Apart from the ilmenite, chromite, zircon, staurolite, kyanite, apatite,and pyroxene, and garnet apatite...apatite and zircon,magnetite, titanite, staurolite, kyanite,titanite, apatite, pyroxene, amphibole, apatite...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...formation of alumo-silicates such as sillimanite or staurolite and hence contributes to the rarity of corundum |  | | Book | | Russia (Ural mountains), Zambia (Kafubu) and Zimbabwe (Sandawana)). Their study demonstrates how these...(sulfides of Ag, Pb, Cu, and Zn) in the Charcas mining district, San Luis Potosi. The area is characterized by...(Figure 2). Colombia, Brazil, Zambia, Russia, Zimbabwe, Madagascar, Pakistan, and Afghanistan (Figure...17. Tsa da Gliza. South Africa: 18. Gravelotte. Zimbabwe: 19. Sandawana, Masvingo, Filibusi. Mozambique:...[18], the Muzo mine in Colombia [1], the Mohmand district in Pakistan [1], and Eidswoll in Norway [13]. |  | | Book (edition) | | Ceylon. Rhodesia, and S.W. Africa: Sri Lanka, Zimbabwe, and Namibia, respectively. However, although...Ontario, Canada Almandine: Gore Mountain, New York Staurolite: Georgia Augite: Ontario Pyrope: Navajo Reservation...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 (edition) | | extensive fields in the prophetically named Kimberley district of Western Australia promise to be of world importance...have been cut as gems are those from Sandawana in Zimbabwe, where the pegmatite veins containing the emeralds...Figure 1.26 Emerald in pegmatite from Sandawana, Zimbabwe 30 The Ages of Gems About 2565 million years...Colombia and the Archaean (2600 Ma) deposits in Zimbabwe, emeralds have formed at many different times...rewarded this kind of investment in both Sandawana (Zimbabwe) and Itabira (Brazil). The mining of emerald focuses |
|
