 | | 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 (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...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) | | Southdale, 2135, South Africa c De Beers Group Services, PO Box 47, Kimberley, South Africa d De Beers...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...small and marginal, such as the Frank Smith Mine in South Africa. They include large diatremes such as...with the discovery of the older diamond mines in South Africa such as Koffiefontein, Jagersfontein and the |  | | 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...the modern watershed. The ilmenite geochemistry eliminates other Zimbabwe Kimberlites as potential sources |  | | 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) | | 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...enstatite, garnet, clinopyroxene, phlogopite, ilmenite and zircon, for which petrologic studies indicate |  | | Journal (article/letter/editorial) | | perovskite are rare accessories in Utype diamonds. Ilmenite of a wide range of compositions, containing up...the presence of sigmoidal oriented lamellae of ilmenite, picroilmenite (geikielite), and corundum; these...TITANIUM-BEARING OXIDES, especially rutile and ilmenite, play an important role in many ore deposits within...R u d n i c k et al., 2000). Although rutile + ilmenite have been identified as inclusions in diamonds...reports on the composition of rutile, associated ilmenite, and some other rare Tibearing oxides (titanates |  | 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) | | inclusion in the Juina diamonds. It coexists with ilmenite, Cr-Ti spinel, a phase with the major-element...one diamond, associated with CaTiperovskite, Mn-ilmenite and an unidenti®ed Si-Mg phase. Neither Cr-pyrope...in Ti (Cr2O3<36.5 wt%, and TiO2>10 wt%). Most ilmenite inclusions have low MgO contents, and some have...the diamonds from depths near 670 km, and adds ilmenite and relatively low-Cr, high-Ti spinel to the known...exploration: Low-Mg olivine, low-Mg and high-Mn ilmenite, and low-Cr spinel should be included in the list |  | | Journal (article/letter/editorial) | | minerals (typically ferroan geikielite or magnesian ilmenite). Perovskite precipitates later than macrocrystal...replacement by late-stage minerals, typically TiO2, ilmenite, titanite and calcite. Replacement reactions are...“incompatible” elements. In some cases (Benfontein in South Africa), differentiation processes may have contributed...hypabyssal-facies kimberlites such as the Benfontein sill in South Africa (Dawson & Hawthorne 1973). Numerous publications...spinel, apatite, calcite, serpentine, monticellite, ilmenite and sulfides (Mitchell 1986); 975 38#4-août00-2170-18 |  | | Journal (article/letter/editorial) | | inclusions, (i.e. primary solution of c-olivine) and an ilmenite inclusion with an eskolaite (Cr2O3) component...Earth mantle. The study of diamonds from the Mwadui Mine has the scope to provide data on the state of the...Africa (Dawson 1992). The Mwadui Mine (formerly known as Williamson Mine) in Western Tanzania is the largest...1977; Raber 1978; Shee 1980 unpublished). The Mwadui Mine preserves crater facies, including lake beds, a...low CaO region found for example, at the Finsch Mine diamonds (Harris and Gurney 1979). In general major |  | | 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 |  | | 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 |  | | Journal (article/letter/editorial) | | (23), ferropericlase + SiO2 (1), ferropericlase + ilmenite (2); ferropericlase + ‘‘olivine’’ (1), ferropericlase...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...inclusions in diamond from Monastery kimberlite, South Africa. In: Ross J et al. (eds) Kimberlites and...diatremes, Colorado–Wyoming State Line kimberlite district, North America. In: Ross J et al. (eds) Kimberlites |  | Macdonald, Ray, Bagiński, Bogusław, Belkin, Harvey E., Stachowicz, Marcin (2019) Composition, paragenesis, and alteration of the chevkinite group of minerals. American Mineralogist, 104 (3) 348-369 doi:10.2138/am-2019-6772 | Journal (article/letter/editorial) | | inclusions in diamond in a kimberlite at Ranch River, Zimbabwe, grew under mantle P-T conditions (Kopylova...perrierite-(La) was described from the Eifel volcanic district, Germany, by Chukanov Figure 4. The main compositional...silicate–carbonate assemblages of the Vishnevogorsky complex, South Urals (Makagonov and Muftakhov 2016). Niobium is...inclusions in diamonds from the River Ranch kimberlite pipe in Zimbabwe. They gave the formula as (Ce2...much higher Cr content. The inclusions in the River Ranch kimberlite may have been formed during a K-metasomatic |  | | Journal (article/letter/editorial) | | metasomatism 54 29 Fe-metasomatised lherzolites F ilmenite 42 27 lherzolites with phlogopite; Ca-Al metasomatism...(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 |  | 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) | | pyrope-bearing diamondiferous peridotites described from South African localities, North America and Aikhal pipe...%). The restudy of olivine from an unusual Cr-ilmenite and Cr-rich Olivine inclusions in Siberian diamonds:...may be explained by the presence of coexisting ilmenite and high TiO2 (1.91 wt.%) in pyrope from this...diamonds and diamonds from several mines worldwide. Mine Internacionalnaya Aikhal Yubileinaya Komsomolskaya...48 Buffalo Hills W.Australia Premier Finsch River Ranch Majgawan Venetia Liaoning (No.50) Sloan Kelsey |  | | 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) | | carbon, and titanium minerals from kimberlite (ilmenite FeTiO3, perovskite CaTiO3, and rutile TiO2) were...minerals in kimberlite are mostly represented by ilmenite (Fe,Mg)TiO3 and perovskite CaTiO3; rutile TiO2...rocks in kimberlite (Sobolev and Yefimova, 2000). Ilmenite and rutile trapped from parental melts in mantle...predominate as inclusions in diamonds. High-Mg ilmenite with 8–16.6 wt % MgO and a variable Cr2O3 concentration...composition is close to that of ilmenite from diamondiferous ilmenite peridotite including metasomatized |  | | Journal (article/letter/editorial) | | petrological examination, as, inter alia, aenigmatite, ilmenite, allanite or sphene, and that they are much more...occurring as inclusions in diamonds of the River Ranch kimberlite, Zimbabwe (Kopylova et al., 1997a,b), contains...found as inclusions in diamonds in the River Ranch kimberlite, Zimbabwe, was termed Cr-chevkinite by Kopylova...and charnockites of the Eastern Ghats Province of South India (Grew and Manton, 1986), metacarbonates in...uranium-thorium bearing pegmatites of Nawahatu area, Purulia district, West Bengal. Indian Minerals, 46, 175 176. Becker |  | | Report (issue) | | Windhoek* Gaborone * Pretoria * Mbabane REPUBLIC OF SOUTH AFRIC1' \ Maputo * LESOTHO MAURITIUS (J Port...137 Sierra Leone . . . . . . . . . . . . . 141 South Africa . . . . . . . . . . . . . 145 Sudan . . ...195 Zambia . . . . . . . . . . . . . . . . 203 Zimbabwe . . . . . . . . . . . . . . . 213 Other Countries...of diversified experience in mineral exploration, mine design, development, and operations, as well as...and the Middle East, especially Iraq, Namibia, South Africa, and Zaire. Hendrik G. van Oss is an economic |  | | Journal (article/letter/editorial) | | Grahamstown, 6140, South Africa. e-mail: andy.moore@info.bw © 2009 March Geological Society of South Africa ABSTRACT...the 3106 Cullinan, recovered from the Premier Mine, South Africa (Williams, 1932), as well as gems like...kindly provided by Debbie Bowen of Letseng Diamond Mine, illustrates a selection of Type IIa stones from...the Letseng Type IIa stones do not fluoresce. SOUTH AFRICAN JOURNAL OF GEOLOGY, 2009, VOLUME 112 PAGE...IIa diamonds from Letseng Mine, curtesey of Debbie Bowen of Letseng Diamond Mine. Large stone is the 603 |  | | Book | | associated alkalic basaltic rocks from Pishin District, Pakistan.4 Reasons of variations of individual...prognosis and prospering of diamond's host rocks on the south of Siberian platform.38 The petrology and geochemistry...of a polymict xenolith from the Kimberley Area, South Africa......40 Eclogites from the Mir kimberlite...megacrysts from the Lace (Group II) kimberlite, South Africa..........52 Isotope composition of the sub-continental...Southeastern Raipur kimberlitic field, Raipur District, Madhya Pradesh, Central India.106 Experimental |  | Macdonald, R., Bagiński, B., Kartashov, P., Zozulya, D., Dzierżanowski, P. (2012) Chevkinite-group minerals from Russia and Mongolia: new compositional data from metasomatites and ore deposits. Mineralogical Magazine, 76 (3) 535-549 doi:10.1180/minmag.2012.076.3.06 | Journal (article/letter/editorial) | | fluorite; flricht, fluorichterite; gad, gadolinite; ilm, ilmenite; kat, katophorite; K-f, K-feldspar; mcl, microcline;...inclusions in diamonds from the River Ranch kimberlite pipe in Zimbabwe (Kopylova et al., 1997). This phase...chevkinite-(Ce) mantled by a corona of allanite-ilmenite-titaniteepidote-quartz in altered syenites from...and associated pegmatites of East Antarctica and South India. Mineralogical Magazine, 73, 149164. Carlier...strong oxidation associated with magma mixing in the south Peruvian potassic province. Lithos, 104, 5470. |  | | Book | | Verlag, photographs 2; 4. Geological Society of South Africa, photographs on ps 62; 193; 217. Harry N...Seychelles Sierra Leone Socotra (Yemen) Somalia South Africa Sudan Swaziland Tanzania Togo Tunisia Uganda...Sahara (under Moroccan administration) Zambia Zimbabwe 142 146 148 152 156 160 162 168 172 176 180 186...platinum-group metals (PGM), titanium minerals (rutile and ilmenite), vanadium, vermiculite and zirconium (Coakley...Principe, Sierra Leone, Somalia, Sudan, Uganda and Zimbabwe. Negative economic impacts that resulted from |  | Bulanova, G.P., Muchemwa, E., Pearson, D.G., Griffin, B.J., Kelley, S.P., Klemme, S., Smith, C.B. (2004) Syngenetic inclusions of yimengite in diamond from Sese kimberlite (Zimbabwe) — evidence for metasomatic conditions of growth. Lithos, 77 (1) 181-192 doi:10.1016/j.lithos.2004.04.002 | Journal (article/letter/editorial) | | of yimengite in diamond from Sese kimberlite (Zimbabwe) — evidence for metasomatic conditions of growth...b Rio Tinto Zimbabwe Ltd., Kenilworth Garden, 1 Kenilworth Rd., Newlands, Harare, Zimbabwe c Department...macrodiamond from the Sese kimberlite (50 km south of Masvingo, Zimbabwe). One yimengite inclusion carries lamellae...40 Ar/39Ar; Kimberlite; Mantle; Metasomatism; Zimbabwe 1. Introduction Yimengite, a very rare Large...olivine, pyrope, magnesian chromite, phlogopite, ilmenite, chromian diopside, apatite, zircon, moissanite |
|
