 | | 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 .............................. |  | | 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) | | 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. TĂŤii.s provides the framework...to the nortii and south oĂ' the modern central Zimbabwe watershed, wliich separates the Zambezi and Limpopo |  | 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 OBERTHĂśR§ Bundesanstalt fĂĽr...the Somabula gravels, a paleoplacer of Upper Karoo (Triassic, ~200 Ma) age near Gweru, Zimbabwe. The...The polymict spectrum of heavy minerals in the Somabula placers comprises staurolite, zircon, monazite,...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) | | 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...other minerals associated with the diamonds at Somabula might be expected. PRODUCTION Value ÂŁ27,843 3...331 2,991 2,230 3,083 1,917 GENERAL GEOLOGY The Somabula Forest and the surrounding country is underlain |  | | Journal (article/letter/editorial) | | F. P. Mennell—The Somabula Diamond Field of Rhodesia. 4591 Quarries. Characteristic fossils: Amplexi-zaphrentis...{To be concluded in our next number.) IV.—THE SOMABULA DIAMOND FIELD OF KHODESIA. By F. P. MENNELL, F...the opening up of the interesting deposit of the Somabula Forest, so far north of any other known occurrence...termed. No detailed or authentic description of the Somabula field has so far appeared. The writer briefly...1017/S0016756800118758 460 F. P. Mennell—The Somabula Diamond Field of Rhodesia. afiFord some idea of |  | | Journal (issue) | | Geological Society of Zimbabwe Newsletter June, 2011 Geological Society of Zimbabwe 1960 -2010 G S Z...Newsletter June 2011 Tectonic evolution of the Zimbabwe Craton in the early Palaeoproterozoic. (a) Following...Following Söderlund et al. (2010), the Zimbabwe craton is positioned along the eastern margin of the Superior...basin initiated. (c) Assembly of the Kaapvaal and Zimbabwe cratons, and unknown terrane, Terra Incognita...Incognita at ca. 2.0 Ga led to tectonic escape of the Zimbabwe Craton and dextral shearing in the Limpopo Belt |  | | 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...after a review of all the facts, firstly, that the Somabula diamonds, as also those of Brazil, India, and...the sapphire, topaz, chrysoberyl, staurolite, kyanite, etc., with which they are associated, as has indeed...advise them to look for diamonds in staurolite or kyanite schists ? Some, through ignorance, have actually |  | | 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) | | 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...were observed among the crystals. Seeing that kyanite is so abundant, the presence of staurolite is exactly |  | | Journal (article/letter/editorial) | | after a review of all the facts, firstly, that the Somabula diamonds, as also those of Brazil, India, and...the sapphire, topaz, chrysoberyl, staurolite, kyanite, etc., with which they are associated, as has indeed...advise them to look for diamonds in staurolite or kyanite schists ? Some, through ignorance, have actually...diamonds. I even know of a locality where staurolite, kyanite, tourmaline, garnet, and rutile can be got from |  | | 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...garnet in plagioclase amphibolite assemblages. Kyanite reported from Vumba (personal communication, Geological...garnet, pyrophyllite, andalusite and epidote. Kyanite is rare (Zones 2b--3b). Epidote, chlorite and prehnite...of metamorphism is suggested by staurolite and kyanite-bearing assemblages reported from the Vumba schist |  | | 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 |  | | Journal (article/letter/editorial) | | one of the names properly applied to olivine. Kyanite and sapphire are unequivocal contact minerals,...whose occurrence may be noted is the socalled ' Somabula blue.' This is harder and heavier than common... points to the same origin in the case of the Somabula field. I am aware that Professor Gregory after |  | 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) | | hematite, almandine, epidote, staurolite, chromite, kyanite, scheelite, pyrite, rutile, galena, spinel and...detrital components in the Karoo-age Somabula gravels, Gweru, Zimbabwe. Can Mineral 40: 435–456 Rudashevsky |  | | Journal (article/letter/editorial) | | cordierite are common. Still farther afield staurolite, kyanite, and garnet become frequent in the north, and garnetand...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 (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 |  | | 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 |  | | Report (issue) | | hardness is above 7 and specific- g1 avity 3·18. Kyanite, a mineral of similar composiit ion, is very seldom...deposits of rich •d iamantiferous grav.els in th,e district around Akwatia, which is 5 miles S.E. of· Kade...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 |  | Melcher, Frank, Graupner, Torsten, Gäbler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, OberthĂĽr, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalum–(niobium–tin) mineralisation in African pegmatites and rare metal granites: Constraints from Ta–Nb oxide mineralogy, geochemistry and U–Pb 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 |  | | 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 |  | | Book | | and Chantal Peiffert Metamorphic and Metasomatic Kyanite-Bearing Mineral Assemblages of Thassos Island (Rhodope... Russia (Ural mountains), Zambia (Kafubu) and Zimbabwe (Sandawana)). Their study demonstrates how these...centimetres) and vividly coloured Mn-rich minerals (kyanite, green andalusite, garnet -grossular, and spessartine-...[35]. They also show that the orange colour of kyanite from Thassos is due to Mn3+ ; this is the second...occurrence (after Loliondo, Tanzania) of such kyanite. Voudouris et al. [36] offer an overview of collector |  | | Book | | ........................ 7.2 Evolution of the Zimbabwe Craton..........................................swarms are outlined in several terrains, including Zimbabwe Craton (Fig. 3.1), southern India (Fig. 3.2) and...Sebakwian swarms in the Selukwe and Mashaba areas of Zimbabwe (Stowe 1973) (Fig. 3.1), pre-3.4 Ga old Sargur...xenolith distribution patterns in the Mashaba area, Zimbabwe Craton: T tonalite, D granodiorite, A adamellite...reported from the Selukwe-Gwenoro Dam area, southern Zimbabwe (Stowe 1973; Taylor et al. 1991), where both across-strike |
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