 | | Journal (issue) | | Geological Society of Zimbabwe G Z S Newsletter October 2015 No. 3 of 3 of 2015 Heavy mineral concentrate...974g) from the Somabula alluvial deposit. One diamond crystal (octahedron/dodecahedron) of gem quality...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 |  | | Journal (issue) | | Geological Society of Zimbabwe G Z S Newsletter February 2016 No. 1 of 3 of 2016 Faceted round brilliant...brilliant cut Marange diamond; 8.14mm diameter. Brown colour with a few visible channel inclusions. Photographed...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 |  | | 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...chromites. The diamond inclusion (DI) chemistry demonstrates a limited overlap with River Ranch kimberlite...spinel and garnet are more Mg-rich. Most River Ranch diamond inclusions were equilibrated at T = 1080±...Archean oceans. Like diamond inclusions from all other kimberlites studied, the River Ranch DI have a lithospheric |  | | Journal (article/letter/editorial) | | 00+0.00 A REVIEW OF THE MINERALS INDUSTRY IN ZIMBABWE T. J. VEASEY School of Chemical Engineering,...projects have been selected from the areas of diamond, copper and platinum production as examples of...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 |  | | 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...Klipspringer kimberlitic deposits from South Africa, and micro-sized diamonds from the Klipspringer and Premier...Premier kimberlite intrusions in South Africa. Type IaAB diamonds are found in all the samples; Type IaB |  | | Journal (issue) | | Geological Society of Zimbabwe Newsletter February, 2007 Geological Society of Zimbabwe Newsletter February...Marange Diamond, scale ~ 8mm across Photo credit, Martin Roberts THE GEOLOGICAL SOCIETY OF ZIMBABWE, P.O...1719, CAUSEWAY, HARARE • Geological Society of Zimbabwe Newsletter February 2007 Contents EDITORIAL...Department, University of Zimbabwe ……………………………………… The Geological Survey of Zimbabwe ………………………………………………… Mining...…………………………………………………… …. 22 2 Geological Society of Zimbabwe Newsletter February 2007 Editorial All the very |  | | Journal (article/letter/editorial) | | c a t e / o r e g e o r ev Kimberlite-hosted diamond deposits of southern Africa: A review Matthew Field...Southdale, 2135, South Africa c De Beers Group Services, PO Box 47, Kimberley, South Africa d De Beers...April 2008 Keywords: Diamond Kimberlite Diatreme Pipe Dyke Mantle-xenolith Diamond-inclusion A B S T R...Following the discovery of diamonds in river deposits in central South Africa in the mid nineteenth century...discovered in South Africa and Botswana in particular, but also in Lesotho, Swaziland and Zimbabwe. A century |  | 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...Lithospheric mantle Peridotite xenoliths Diamond Kimberlite macrocrysts Zimbabwe a b s t r a c t Inclusion-bearing...of the lithospheric mantle beneath the southern Zimbabwe Craton. The diamonds are mostly octahedral, moderately...contrast to the Kaapvaal mantle lithosphere. The Zimbabwe mantle assemblage has been only slightly affected |  | | Journal (article/letter/editorial) | | and Mobile-Belt Environments from Zimbabwe and Implications for Diamond Potential a Peter R. Hildebrand...Sciences , University of Cape Town , Rondebosch, 7700, South Africa Published online: 06 Jul 2010. To cite this...and Mobile-Belt Environments from Zimbabwe and Implications for Diamond Potential, International Geology...and Mobile-Belt Environments from Zimbabwe and Implications for Diamond Potential PETER R. HILDEBRAND Department...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...watershed. The ilmenite geochemistry eliminates other Zimbabwe Kimberlites as potential sources of these pathfinder |  | | Journal (article/letter/editorial) | | mantle depletion, metasomatism, kimberlites, diamond exploration IA, 15 Nov., 2015 2 ACCEPTED MANUSCRIPT...particularly, diamondiferous magmatism; however diamond IP prospecting is still subject to numerous uncertainties... The importance of SC R lithospheric age in diamond exploration has been recognized 50 years ago (Clifford...NU for many decades as a guiding principle of diamond exploration, known as the Clifford’s Rule. Later...graphite–diamond transition have established the temperature-depth stability field for diamond (Kennedy |  | 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...and 1% are websteritic. The dominant eclogitic diamond substrates sampled at Karowe are compositionally...The highly depleted character of the peridotitic diamond substrates is further documented by the high mean...highly depleted cratonic lithosphere at the time of diamond formation extended to at least 220 km depth. Inclusion |  | | Journal (article/letter/editorial) | | 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...west. In contrast, all suites examined from the Zimbabwe Craton, as well as the Premier kimberlite cluster...2000). The maximum depth from which xenoliths and SOUTH AFRICAN JOURNAL OF GEOLOGY, 2004, VOLUME 107, PAGE...compatible element (e.g., Cr, Ni) depletion, correlated SOUTH AFRICAN JOURNAL OF GEOLOGY DAVID R. BELL AND RORY |  | | Journal (article/letter/editorial) | | Belt, South Africa. Jay Barton Department of Geology, RAU, P.O. Box 524, Auckland Park 2006, South Africa...Southdale 2135, South Africa e-mail: fred.brown@debeersgroup.com © 2003 Geological Society of South Africa Diamond...Diamond bearing, kimberlite pipes in the Central Zone of the Limpopo Belt, Limpopo Province, South Africa...carats/100 tonnes. They presently produce about ~40% of South Africa’s diamonds and hence ~6% of the total world’s...the Kaapvaal and Zimbabwe Cratons, apparently defies one of the basic axioms of diamond exploration, that |  | | Journal (article/letter/editorial) | | (71 samples), intergrowths with polycrystalline diamond aggregates (20 samples), and extracted from diamondiferous...study. Compositions of rutiles associated with diamond and/or coesite from crustal ultrahigh-pressure...number of diamonds and diamondiferous eclogites. Diamond-associated rutiles contain up to 0.8 wt% Al 2 O...the U type). The majority of rutiles, including diamond inclusions, are heterogeneous with widely varying...corundum; these are documented for the first time in diamond-associated rutiles and may represent exsolution |  | | Journal (article/letter/editorial) | | underwent a decarbonation reaction to form both diamond and ferropericlase simultaneously in the lower...coexisting with these ferropericlases in the same diamond may represent the most abundant mineral species...ferropericlase and enstatite occurring in the same diamond from Koffiefontein. Coupling with high-pressure and...when it coexists with ferropericlase in the same diamond as they do in the so-called ‘‘forbidden’’ assemblages...coexisting with enstatite or SiO2 in the same diamond (Fig. 2). The chemical composition for all these |  | 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) | | almandine-pyrope phase). Majoritic garnet occurs in one diamond, associated with CaTiperovskite, Mn-ilmenite and...are low in Cr and Mg, F. V. Kaminsky (&) 1KM Diamond Exploration, 815 Evelyn Drive, West Vancouver V7...and higher Ca, Cr and Zn contents than typical diamond-inclusion olivines. They are interpreted as inverted...to ±2.5&), except for the one majorite-bearing diamond (d13C=±11.4&). There are high proportions of nitrogen-free...These observations have practical consequences for diamond exploration: Low-Mg olivine, low-Mg and high-Mn |  | 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) | | two main types of geological environment support diamond formation: they are ultramafic (or peridotitic)...peridotites and eclogites in kimberlites. In primary, diamond-bearing kimberlite and lamproite rocks the ratio...diamonds dominate in the overwhelming majority of diamond occurrences worldwide. Olivine is the most typical...for analysis on a single polished surface with diamond. Olivine from diamonds of the Snap Lake dyke system...grain of such composition located in the inner diamond growth zone is associated with an olivine grain |  | | Journal (article/letter/editorial) | | studies of xenoliths from its many productive diamond mines and from other kimberlites. More data probably...(Finnerty and Boyd, 1987), which roughly parallels the diamond– graphite stability curve. This procedure may underestimate...temperature, it is generalised as a line parallel to the diamond – graphite stability curve. Model conductive geotherms...(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 |  | | Journal (article/letter/editorial) | | BRODERICK .\W^ D. PI.OWES 65 Landscape evolution in Zimbabwe from the Permian to present, with implications...(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) | | 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...Grahamstown 6140, South Africa. e-mail: J.Moore@ru.ac.za © 2006 December Geological Society of South Africa ABSTRACT...Karoo-age diamond-bearing conglomerates, located to the southwest of Gweru in central Zimbabwe, have long...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...geochemistry of the sulphide inclusions. The majority of diamond studies have been based on diamonds formed in the...Ellendale lamproites intrude the King Leopold Orogen, south of the Kimberley craton. The sulphide inclusions...at least the Mesoarchaean, with the lherzolitic diamond-forming event much younger and unrelated to the...mantle (SCLM) and has helped constrain whether diamond formation in the SCLM is continuous or episodic |  | | Journal (article/letter/editorial) | | Accepted: 7 January 1998 Abstract Syngenetic diamond inclusions from the Mwadui kimberlite reveal that...pairs suggests successive iron enrichment during diamond formation, e.g. leading to the presence of harzburgitic...harzburgitic garnet and lherzolitic olivine in the same diamond. Apart from the dominant peridotitic inclusion...association Fe-FeO-Fe3O4 in one single diamond indicates diamond formation over a large range of fO2 conditions...harzburgitic garnet and a SiO2-phase in the same diamond. Alternatively the formation of the SiO2phase may |  | Taylor, Lawrence A., Milledge, H. Judith, Bulanova, Galina P., Snyder, Gregory A., Keller, Randall A. (1998) Metasomatic Eclogitic Diamond Growth: Evidence from Multiple Diamond Inclusions. International Geology Review, 40 (8) 663-676 doi:10.1080/00206819809465230 | Journal (article/letter/editorial) | | com/loi/tigr20 Metasomatic Eclogitic Diamond Growth: Evidence from Multiple Diamond Inclusions a b c Lawrence...(1998) Metasomatic Eclogitic Diamond Growth: Evidence from Multiple Diamond Inclusions, International Geology...reserved. Metasomatic Eclogitic Diamond Growth: Evidence from Multiple Diamond Inclusions LAWRENCE A. TAYLOR...Tennessee, Knoxville, Tennessee 37996 Abstract Diamond formation from metasomatic fluids, rather than...Yakutia, Russia form the basis for our evaluation of diamond origin. Mir eclogitic diamonds and their multiple |  | | 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 |
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