 | | Journal (issue) | | Geological Society of Zimbabwe G Z S Newsletter October 2015 No. 3 of 3 of 2015 Heavy mineral concentrate...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 .................................11 12 NEWS Geology Department, University of Zimbabwe – Maideyi Meck ……………… The Professor Tom Blenkinsop... ! ! ! ! ! ! ! ! ! 2 Geological Society of Zimbabwe Newsletter October, 2015 Editorial Welcome to |  | | Journal (issue) | | Geological Society of Zimbabwe G Z S Newsletter February 2016 No. 1 of 3 of 2016 Faceted round brilliant...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. Part 2. ........................ 6 16 NEWS Geology Department, University of Zimbabwe – Maideyi Meck …………… The Professor Tom Blenkinsop... 2 Geological Society of Zimbabwe Newsletter February, 2016 Editorial Another |  | | Journal (article/letter/editorial) | | Mineral inclusions in diamonds from the River Ranch kimberlite, Zimbabwe Received: 11 January 1995 / Accepted:...diamonds from the River Ranch pipe in the Late Archean Limpopo Mobile Belt (Zimbabwe), are phases of harzburgitic...chemistry demonstrates a limited overlap with River Ranch kimberlite macrocrysts: the DI garnets are more Ca-undersaturated...DI spinel and garnet are more Mg-rich. Most River Ranch diamond inclusions were equilibrated at T = 1080±...inclusions from all other kimberlites studied, the River Ranch DI have a lithospheric anity and therefore indicate |  | | Journal (article/letter/editorial) | | elsevier.com/locate/lithos Subsidence breccias in kimberlite pipes—an application of fractal analysis Wayne...Centre, Geology, P.O. Box 82232, Southdale 2135, South Africa Received 25 June 2003; accepted 26 November...has been identified at Venetia, River Ranch and Wimbledon kimberlite pipes. The contact breccia is clast...clast supported with no juvenile kimberlite component, has tightly packed, angular fragments (with occasional...shear-fabric dipping towards the center of each kimberlite pipe or volcanic event. Clasts have preferred |  | | Journal (article/letter/editorial) | | Research Institute, Nelson Mandela University, South Africa Deutsches GeoForschungsZentrum GFZ, Telegrafenberg...University, South Africa e-mail: Maarten.DeWit@mandela.ac.za © 2017 September Geological Society of South Africa...kimberlites: macro-sized diamonds from River Ranch kimberlite in Zimbabwe and the Swartruggens and Klipspringer...deposits from South Africa, and micro-sized diamonds from the Klipspringer and Premier kimberlite intrusions...intrusions in South Africa. Type IaAB diamonds are found in all the samples; Type IaB diamonds only occur in |  | | Journal (article/letter/editorial) | | e r. c o m / l o c a t e / o r e g e o r ev Kimberlite-hosted diamond deposits of southern Africa: A...Southdale, 2135, South Africa c De Beers Group Services, PO Box 47, Kimberley, South Africa d De Beers...Available online 22 April 2008 Keywords: Diamond Kimberlite Diatreme Pipe Dyke Mantle-xenolith Diamond-inclusion...Following the discovery of diamonds in river deposits in central South Africa in the mid nineteenth century...recognized. These volcanic rocks, that were named “kimberlite”, were to become the corner stone of the economic |  | Smith, Chris B., Pearson, D. Graham, Bulanova, Galina P., Beard, Andrew D., Carlson, Richard W., Wittig, Nadine, Sims, Keith, Chimuka, Lovemore, Muchemwa, Ellah (2009) Extremely depleted lithospheric mantle and diamonds beneath the southern Zimbabwe Craton. Lithos, 112. 1120-1132 doi:10.1016/j.lithos.2009.05.013 | Journal (article/letter/editorial) | | lithospheric mantle and diamonds beneath the southern Zimbabwe Craton Chris B. Smith a,⁎, D. Graham Pearson b...Exploration, Johannesburg, South Africa g Murowa Diamonds, Harare, Zimbabwe b c a r t i c l e i n f...mantle Peridotite xenoliths Diamond Kimberlite macrocrysts Zimbabwe a b s t r a c t Inclusion-bearing...Inclusion-bearing diamonds, mantle xenoliths, and kimberlite concentrates from the Cambrian-aged Murowa and Sese kimberlites...of the lithospheric mantle beneath the southern Zimbabwe Craton. The diamonds are mostly octahedral, moderately |  | | Journal (article/letter/editorial) | | 00+0.00 A REVIEW OF THE MINERALS INDUSTRY IN ZIMBABWE T. J. VEASEY School of Chemical Engineering,...of the potential for the minerals industry in Zimbabwe. Some aspects of social and political factors...HISTORICAL BACKGROUND The minerals industry in Zimbabwe has its origins in ancient times and workings...the country - - the spectacular ruins of Great Zimbabwe. The ruins are a labyrinth of stone walls, fabricated...the fourteenth century the population of Great Zimbabwe probably exceeded ten thousand [1], with an economy |  | | Journal (article/letter/editorial) | | Rifted, Craton, and Mobile-Belt Environments from Zimbabwe and Implications for Diamond Potential a Peter...Sciences , University of Cape Town , Rondebosch, 7700, South Africa Published online: 06 Jul 2010. To cite this...Rifted, Craton, and Mobile-Belt Environments from Zimbabwe and Implications for Diamond Potential, International...Rifted, Craton, and Mobile-Belt Environments from Zimbabwe and Implications for Diamond Potential PETER R...Sciences, University of Cape Town, Rondebosch 7700, South Africa Abstract Three major components with different |  | | Journal (article/letter/editorial) | | EVOLUTION OF THE ZAMBEZI-LIMPOPO WATERSHED, CENTRAL ZIMBABWE A.E. MOORE African Queen Mines Ltd., Box 66 Maun...of Geology, Rhodes University, Grahamstown 6140, South Africa School of Earth and Environmental Sciences...Matieland 7602, South Africa e-mail: fcotterill@gmail.com © 2012 December Geological Society of South Africa ...out to the south of the Zambezi-Limpopo drainage divide in the vicinity of Bulawayo, Zimbabwe, led to the...population found in the early Palaeozoic Colossus kimberlite, which is located to the north of the modern |  | | Journal (article/letter/editorial) | | structure of the southern African mantle from kimberlite megacrysts David R. Bell Geophysical Laboratory...Sciences, University of Cape Town, Rondebosch 7700, South Africa e-mail: David.R.Bell@asu.edu Rory O. Moore...Town, Rondebosch 7700, South Africa Email: © 2004 Geological Society of South Africa ABSTRACT Xenoliths...suites examined from the Zimbabwe Craton, as well as the Premier kimberlite cluster on the Kaapvaal craton...2000). The maximum depth from which xenoliths and SOUTH AFRICAN JOURNAL OF GEOLOGY, 2004, VOLUME 107, PAGE |  | | Journal (article/letter/editorial) | | mantle in southern Africa: 2. Correlations with kimberlite distribution, seismic velocities and Moho sharpness...mantle in southern Africa: 2. Correlations with kimberlite distribution, seismic velocities and Moho sharpness...mantle in southern Africa: 2. Correlations with kimberlite distribution, seismic velocities and Moho IP... geochemical data on kimberlite-hosted mantle xenoliths, and data on kimberlite ages and distribution...may MA be biased by incomplete information on kimberlite ages. (3) Diamondiferous kimberlites are characteristic |  | | Journal (article/letter/editorial) | | geology in and around the Venetia kimberlite pipes, Limpopo Belt, South Africa. Jay Barton Department of...Geology, RAU, P.O. Box 524, Auckland Park 2006, South Africa e-mail: jmb@na.rau.ac.za Reiner Klemd Institute...Southdale 2135, South Africa e-mail: fred.brown@debeersgroup.com © 2003 Geological Society of South Africa Diamond...bearing, kimberlite pipes in the Central Zone of the Limpopo Belt, Limpopo Province, South Africa were...carats/100 tonnes. They presently produce about ~40% of South Africa’s diamonds and hence ~6% of the total world’s |  | | Journal (article/letter/editorial) | | Sciences, University of Cape Town, Rondebosch 7701, South Africa De Beers Exploration Division, GeoScience...GeoScience Centre, PO Box 82232, Southdale 2135, South Africa Corresponding author: e-mail: hielke.jelsma@debeersgroup...Sciences, University of Cape Town, Rondebosch 7701, South Africa e-mail: maarten@cigces.uct.ac.za Christien...Sciences, University of Cape Town, Rondebosch 7701, South Africa e-mail: christie@cigces.uct.ac.za Paul H...Sciences, University of the Witwatersrand, Wits 2050, South Africa e-mail: dirksp@geosciences.wits.ac.za Giulio |  | Motsamai, Theetso, Harris, Jeffrey W., Stachel, Thomas, Pearson, D. Graham, Armstrong, John (2018) Mineral inclusions in diamonds from Karowe Mine, Botswana: super-deep sources for super-sized diamonds?. Mineralogy and Petrology, 112. 169-180 doi:10.1007/s00710-018-0604-9 | Journal (article/letter/editorial) | | PAPER Mineral inclusions in diamonds from Karowe Mine, Botswana: super-deep sources for super-sized diamonds...from the Karowe Mine in north-east Botswana, along the western edge of the Zimbabwe Craton. From a total...large diamonds from this mine. Keywords Zimbabwe Craton . Orapa kimberlite cluster . Sublithospheric...(including the 1109 carats Lesedi la Rona) at the Karowe mine in north-eastern Botswana raises the question: what...in a representative suite of diamonds from this mine. Based on recent conflicting views on the origin |  | | Journal (issue) | | Geological Society of Zimbabwe Newsletter February, 2007 Geological Society of Zimbabwe Newsletter February...SOCIETY OF ZIMBABWE, P.O. BOX CY 1719, CAUSEWAY, HARARE • Geological Society of Zimbabwe Newsletter...Department, University of Zimbabwe ……………………………………… The Geological Survey of Zimbabwe ………………………………………………… Mining...…………………………………………………… …. 22 2 Geological Society of Zimbabwe Newsletter February 2007 Editorial All the very...endeavours is critical. 3 Geological Society of Zimbabwe Newsletter February 2007 We continued to pursue |  | | Journal (article/letter/editorial) | | natural laboratory. Fig. 2. Location map showing kimberlite fields (Appendix A) discussed in the text, and...(Fig. 1) is made up of the Archean Kaapvaal and Zimbabwe cratons, separated by the Limpopo Belt. It is...break-up of Gondwana (Brandl and de Wit, 1997). 3.1. Zimbabwe Craton Kusky (1998) recognised two main structural...contrasts in deformational style with the Kaapvaal and Zimbabwe Cratons and appears to be an ancient microcontinent...direct result of collision between the Kaapvaal and Zimbabwe cratons 2.7– 2.6 Ga ago (Limpopo Orogeny). It |  | | Journal (article/letter/editorial) | | diamonds and diamondiferous eclogites from Yakutia, South Africa, and Venezuela (Sobolev et al., 1972, 1997...from diamondiferous eclogite of the Roberts Victor mine (sample RV-15) containing oriented corundum (dark)...samples of diamondiferous eclogites from Yakutian and South African kimberlites also were investigated for comparison...diamondiferous kyanite eclogite from the Roberts Victor mine, South Africa (RV-15) revealed much higher Al2O3 contents...Perovskite typically occurs in the groundmass of many kimberlite bodies as a late-stage mineral (Mitchell, 1972) |  | Kaminsky, F., Zakharchenko, O., Davies, R., Griffin, W., Khachatryan-Blinova, G., Shiryaev, A. (2001) Superdeep diamonds from the Juina area, Mato Grosso State, Brazil. Contributions to Mineralogy and Petrology, 140 (6) 734-753 doi:10.1007/s004100000221 | Journal (article/letter/editorial) | | ct (Gaspar et al. 1998). There are at least 26 kimberlite pipes in the area. Some of them are subeconomic...1989), Koefontein (Moore et al. 1986), River Ranch, Zimbabwe (Kopylova et al. 1997), Birim, Ghana (Stachel...patterns shown by majoritic garnets from the Monastery Mine (Moore et al. 1991), but similar ¯at patterns were...reported as a diamond inclusion in the Canadian DO27 kimberlite pipe where numerous ferropericlase inclusions...8 composition was found in the Jagersfontein kimberlite (Chinn et al. 1998). Wilding et al. (1991) reported |  | Sobolev, Nikolai V., Logvinova, Alla M., Zedgenizov, Dmitry A., Pokhilenko, Nikolai P., Kuzmin, Dmitry V., Sobolev, Alexander (2008) Olivine inclusions in Siberian diamonds: high-precision approach to minor elements. European Journal of Mineralogy, 20 (3) 305-315 doi:10.1127/0935-1221/2008/0020-1829 | Journal (article/letter/editorial) | | eclogites in kimberlites. In primary, diamond-bearing kimberlite and lamproite rocks the ratio of diamonds from...minor elements, Siberian Craton, peridotite, kimberlite. Introduction Oceanic crust subduction and recycling...Olivine xenocrysts and phenocrysts in unaltered kimberlite are also characterized by high forsterite contents...included in diamonds from several major Yakutian kimberlite mines as well as from alluvial deposits of the...the absolutely unique, unaltered state of the kimberlite from Udachnaya East pipe, containing no serpentine |  | | Journal (article/letter/editorial) | | “incompatible” elements. In some cases (Benfontein in South Africa), differentiation processes may have contributed... Keywords: perovskite, alteration, textures, kimberlite. SOMMAIRE Nous présentons ici les résultats...Mots-clés: pérovskite, altération, textures, kimberlite. § E-mail address: achakhmo@gale.lakeheadu.ca...hypabyssal-facies kimberlites such as the Benfontein sill in South Africa (Dawson & Hawthorne 1973). Numerous publications...Th. Although the majority of perovskite from kimberlite is stoichiometrically close to the endmember |  | | Journal (article/letter/editorial) | | Landscape evolution in Zimbabwe from the Permian to present, with implications for kimberlite prospecting A.E...(Pvt.) Limited, Box CH399. Chisipite. Harare. Zimbabwe. e-mail: andy.m()ore@info.b\v F.P.D. (Woody)...Sciences, Liniversity of Cape Town, Rondebosch 7701, South Africa. e-mail: ienton.cotterill@uct.ac.za T. Broderick...Broderick 19 Jenkinson Road, Chisipite, Harare. Zimbabwe e-mail: makari@zol.co.zw D. Plowes 49 Arcadia...Society of South Africa ABSTRACT Evidence is presented to model drainage evolution -Acmss Zimbabwe since |  | | Journal (article/letter/editorial) | | al. (2000) Letseng-La-Terrai, Lesotho River Ranch, Zimbabwe Guinea Mwadui, W. Tanzania Kankan, Guinea...Mineral inclusions in diamonds from the River Ranch kimberlite, Zimbabwe. Contrib Mineral Petrol 129:366–384...Mineral inclusions in diamond from Monastery kimberlite, South Africa. In: Ross J et al. (eds) Kimberlites...ferro-periclase as inclusion in diamonds. 4th International Kimberlite Conference, Perth, Extended Abstr, pp 409–411...Sloan diatremes, Colorado–Wyoming State Line kimberlite district, North America. In: Ross J et al. (eds) Kimberlites |  | | Journal (article/letter/editorial) | | Somabula diamond-bearing alluvial deposit, Central Zimbabwe Andy Moore Somabula Explorations (Pvt) Limited...Limited, Box CH399, Chisipite, Harare, Zimbabwe. e-mail: andy.moore@info.bw John Moore Geology Dept, Rhodes...Grahamstown 6140, South Africa. e-mail: J.Moore@ru.ac.za © 2006 December Geological Society of South Africa ABSTRACT... located to the southwest of Gweru in central Zimbabwe, have long presented an enigma in terms of their...interpreted to reflect deposition in a braided river system. The initial pulse of upper Karoo sedimentation |  | Smit, K.V., Shirey, S.B., Richardson, S.H., le Roex, A.P., Gurney, J.J. (2010) Re–Os isotopic composition of peridotitic sulphide inclusions in diamonds from Ellendale, Australia: Age constraints on Kimberley cratonic lithosphere. Geochimica et Cosmochimica Acta, 74 (11) 3292-3306 doi:10.1016/j.gca.2010.03.001 | Journal (article/letter/editorial) | | Sciences, University of Cape Town, Rondebosch 7701, South Africa Department of Terrestrial Magnetism, Carnegie...Ellendale lamproites intrude the King Leopold Orogen, south of the Kimberley craton. The sulphide inclusions...Viljoen, 2002); Venetia, River Ranch emplaced into the Limpopo Belt between the Zimbabwe and Kaapvaal cratons...province) intrude into the King Leopold Orogen to the south of the Kimberley craton. The Argyle lamproite (East...craton (Plumb, 1979) and is bounded to the east and south by the intracratonic Halls Creek and King Leopold |
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