 | | Journal (article/letter/editorial) | | absorption analysis of diamonds from the Klipspringer kimberlites, South Africa K.J. Westerlund Department of Geological...of Cape Town, Private Bag, Rondebosch 7701, South Africa e-mail: kjw@geology.uct.ac.za J.J. Gurney Department...Rondebosch 7701, South Africa e-mail: jjg@geology.uct.ac.za © 2004 Geological Society of South Africa ABSTRACT...diamonds associated with the 148 Ma Group II Klipspringer kimberlite dyke system emplaced on the Thabazimbi-Murchison...eclogitic (sulfide, garnet, clinopyroxene, kyanite, coesite and rutile). The garnets and clinopyroxenes have |  | | Journal (article/letter/editorial) | | of Cape Town, Rondebosch, 7700, Republic of South Africa Abstract Ages of syngenetic inclusions of peridotitic...diamond-bearing eclogite assemblages may contain coesite, demonstrating diamond formation in silica-saturated...consisting of crustal rocks having attained at least coesite-facies (ca. 3 GPa at ca. 900°C) metamorphism (Chopin...zones (Maruyama et al. 1996). The discovery of coesite in such belts (Chopin 1984) showed that continental...sufficiently rapidly to permit the preservation of coesite. The presence of microdiamond-bearing assemblages |  | | Journal (article/letter/editorial) | | selected Group II kimberlite dyke arrays in South Africa: implications for kimberlite emplacement mechanisms...gviola@geology.uct.ac.za © 2003 Geological Society of South Africa ABSTRACT Group II kimberlite dykes occur in...fracture cleavage ahead of the dyke tip (imparting a local suction) and the low-volume, low-viscosity, highly... typified by those in the Kimberley area of South Africa, currently command greater attention in exploration...distribution of intrusion ages, e.g. across South Africa (le Roex, 1986; Skinner et al., 1992) and eastern |  | | Journal (article/letter/editorial) | | Town, Private Bag Rondebosch, 7701 Cape Town, South Africa Received 27 June 2003; accepted 17 February...syn-dilational crystallization of vein minerals in local tensional areas within the kimberlite. Vein Types...fracture systems in South Africa (Fig. 1; Star, Helam/Swartruggens, Klipspringer) and in opencast workings...associated with the Marsfontein pipe on the Klipspringer system) provide exceptional access to structural...observation, extraction of orientation data from mine maps and by taking oriented samples. Detailed, oriented |  | 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) | | Tinto Mining and Exploration, Johannesburg, South Africa g Murowa Diamonds, Harare, Zimbabwe b c a r...Mwenezi and Chingwizi pipes which intrude the Limpopo Mobile Belt show strongly depleted peridotitic...of a deep lithospheric mantle keel beneath the Limpopo Mobile Belt today and Re–Os analyses of peridotite...Venetia have previously yielded an Archean age. The Limpopo Mobile Belt is therefore interpreted as a product...Archean Kalahari Craton (Clifford, 1970) in southern Africa was formed by the accretion of three crustal terranes |  | | Journal (article/letter/editorial) | | of Cape Town, Rondebosch, 7700, Republic of South Africa of Geological Sciences and Geological Engineering...P O Box 38668, Pinelands, 7430. Republic of South Africa. 0361-0128/10/3894/689-24 the mantle, as far...population of xenocrystic diamonds contributing to run-of-mine production. Evidence is accumulating that the diamond-forming...localities at craton margins, such as Jagersfontein, South Africa. The diamonds typically have low N contents...= Premier representing oldest Group I kimberlite mine (filled diamond), increasing thickness of solid |  | | Journal (article/letter/editorial) | | the Precambrian mantle lithosphere of southern Africa Steven B. Shirey Department of Terrestrial Magnetism...Sciences, University of Cape Town Rondebosch 7701, South Africa, e-mail: shr@geology.uct.ac.za Jeffrey W. Harris...Geological Society of South Africa ABSTRACT Two decades of diamond research in southern Africa allow the age...(the conjoined Kaapvaal Zimbabwe cratons and the Limpopo mobile belt), Archean mantle peridotite and eclogite...of Archean lithosphere, particularly in southern Africa, is to relate lithospheric structure to the age |  | | Journal (article/letter/editorial) | | Sciences, University of Cape Town, Rondebosch 7701, South Africa c Division of Earth Sciences, University of...Abstract Two decades of diamond research in southern Africa allow the age, average N content and carbon composition...conjoined Kaapvaal – Zimbabwe cratons and the Limpopo mobile belt), Archean mantle peridotite and eclogite...and Zimbabwe cratons and the Limpopo mobile belt known as the Southern Africa Seismic Experiment (SASE;...averaged. This cylinder is centered below each diamond mine and extends from 150 to 225 km depth. Seismic data |  | Günther, T., Haase, K.M., Junge, M., Oberthür, T., Woelki, D., Krumm, S. (2018) Oxygen isotope and trace element compositions of platiniferous dunite pipes of the Bushveld Complex, South Africa – Signals from a recycled mantle component?. Lithos, 310. 332-341 doi:10.1016/j.lithos.2018.04.017 | Journal (article/letter/editorial) | | platiniferous dunite pipes of the bushveld complex, South Africa – Signals from a recycled mantle component?...platiniferous dunite pipes of the bushveld complex, South Africa – Signals from a recycled mantle component?...platiniferous dunite pipes of the Bushveld Complex, South Africa – Signals from a recycled mantle component?...have a common magma source (Maier et al., 2013). Local variations in oxygen isotope signatures between...lithospheric mantle (SCLM). Several studies of South African LIPs like the RLS and Karoo MA suggest |  | Agrosì, Giovanna, Tempesta, Gioacchino, Mele, Daniela, Allegretta, Ignazio, Terzano, Roberto, Shirey, Steven B., Pearson, Graham D., Nestola, Fabrizio (2017) Non-destructive, multi-method, internal analysis of multiple inclusions in a single diamond: First occurrence of mackinawite (Fe,Ni)1+xS. American Mineralogist, 102 (11) 2235-2243 doi:10.2138/am-2017-6178 | Journal (article/letter/editorial) | | studies by XRDT on diamond samples from Finsch mine, South Africa (Agrosì et al. 2013), and from the Udachnaya...also in a colorless IaAB diamond from Finsch mine (South Africa; Agrosì et al. 2013) and, conversely, not...mineral by Evans et al. (1964) from the Mackinaw Mine, Washington. Previously, Kouvo et al. (1963) had...described a tetragonal iron sulfide from the Outokumpu Mine, Finland. In both of these occurrences, mackinawite...postgrowth defects of a diamond from Finsch mine (South Africa). European Journal of Mineralogy, 25, 551–559 |  | Howell, D., Stachel, T., Stern, R.A., Pearson, D.G., Nestola, F., Hardman, M.F., Harris, J.W., Jaques, A.L., Shirey, S.B., Cartigny, P., Smit, K.V., Aulbach, S., Brenker, F.E., Jacob, D.E., Thomassot, E., Walter, M.J., Navon, O. (2020) Deep carbon through time: Earth’s diamond record and its implications for carbon cycling and fluid speciation in the mantle. Geochimica et Cosmochimica Acta, 275. 99-122 doi:10.1016/j.gca.2020.02.011 | Journal (article/letter/editorial) | | Sciences, Macquarie University, North Ryde, New South Wales 2109, Australia 11 Centre de Recherches Petrographiques...nine localities in Canada, Australia, Southern Africa and Russia, have been analysed for their carbon...1990), so carbon isotope data for diamonds from this mine of known paragenesis (e.g. Appleyard et al., 2004;...(Palot et al., 2013), the latter two both from South Africa. In these cases, the number of samples is only...carbon. Guaniamo (Venezuela), Jagersfontein (South Africa), Dachine (French Guiana) and Jericho (Canada) |  | | Journal (article/letter/editorial) | | (pyrope–almandine garnet and omphacitic clinopyroxene, coesite, kyanite, rutile, sanidine) and “superdeep” (majoritic...fluid in a fibrous diamond coat from the Diavik Mine (Canada) range in composition from Na–K–Cl brine...internally cloudy diamonds from Koffiefontein (South Africa) [4]. Additionally, primary mantle minerals...in the Panda diamond coats. This may suggest the local presence of a K-rich phase, such as phlogopite [31]...shown are published data from coated diamonds from Africa [1,2] (open squares) and Diavik (Canada) [6] (open |  | Thomassot, E., Cartigny, P., Harris, J.W., Lorand, J.P., Rollion-Bard, C., Chaussidon, M. (2009) Metasomatic diamond growth: A multi-isotope study (13C, 15N, 33S, 34S) of sulphide inclusions and their host diamonds from Jwaneng (Botswana) Earth and Planetary Science Letters, 282 (1) 79-90 doi:10.1016/j.epsl.2009.03.001 | Journal (article/letter/editorial) | | craton margin. This very profitable diamondiferous mine erupted 250±17 Ma ago (Kinny et al., 1989) and produces...et al. (1991) for sulphide inclusions from eight South African mines. Compared to recently reported δ34S...Geochemistry of xenolithic eclogites from West Africa, part I: a link between low MgO eclogites and archean...Geochemistry of xenolithic eclogites from West Africa, part 2: origins of the high MgO eclogites. Geochim...diamonds from the Roberts Victor kimberlite, South Africa: evidence for a 13C depletion in the mantle |  | | Journal (issue) | | formation. 223 Blue Sapphires from the Baw Mar Mine in Mogok Hpone-Phyo Kan-Nyunt, Stefanos Karampelas...combined weight of the piece, retrieved from South Africa, is 314.47 carats. This specimen is part of...bring our readers more of these “direct from the mine” articles, particularly from GIA’s dedicated field...natural diamonds, Figure 1. Archean cratons in South Africa have yielded gem diamonds such as these specimens...6 46 5 52 49 Bundelkhand INDIA 29 64 WEST AFRICA 9 Lithospheric Superdeep Alluvial 14 Carajas |  | | Book | | responsibility for authors’ errors and omissions. SOUTH AFRICA SEVENTH INTERNATIONAL KIMBERLITE CONFERENCE...Survey of South Africa) SouthemEra Resources Ltd SOCIETY SPONSORS Geological Society of South Africa (GSSA)...a Phanerozoic subduction regime in eastern New South Wales, Australia. Mantle Dynamics beneath Mongolia:...growth of Archean cratons: a case study from west Africa. The vertical distribution of indicator minerals...diamond. 61 Cr-poor Megacrysts from the Frank Smith Mine and the source regions of transitional kimberlites |  | | Book (volume) | | diamond bearing kimberlites of Dharwar Craton in South India, (ii) lamproites of Bundelkhand Craton in...(USA) Barbara Scott Smith (Canada) Craig Smith (South Africa) Nick Sobolev (Russia) Thomas Stachel (Canada)...provided logistic support during field trip to the South Indian Kimberlites. The National Mineral Development...hypabyssal and diatreme zone kimberlites from Southern Africa, Canada and the USA. Data were acquired using the...microphenocrysts in the Wesselton W7 hypabyssal kimberlite (South Africa). Plane polarized light image. Numbers indicate |  | | Journal (issue) | | the Helam mine near Swartsruggens, and Sierra Leone is better described as being in West Africa. Nonetheless...geology from the University of Witwatersrand in South Africa. He subsequently spent two years at the De Beers...Beers Diamond Research Laboratory in South Africa and six months doing geochemical prospecting in Nova...ct crystal collected in situ from the wall of a mine at Muzo, Colombia, by GIA’s Bill Boyajian. We also... Seifert and Jaroslav Hyrsl Located just 3 km south of the famous Umba locality, the geologically similar |  | | Journal (issue) | | while maximizing appearance and to account for local market preferences (Caspi, 1997). As shown in figure...decreases; but, as figure 4 shows, there are three local maxima in WLR across the range of angles (that is...highest at very shallow crown angles. The graph shows local maxima at 13°, 23°, and 34°, it begins to drop sharply...variation in WLR due to different crown angles; the local maxima at 23° and 34° in figure 4 become “ridges”...The graph of WLR versus star length shows several local maxima (figure 12A). The overall maximum is found |  | | Report (volume) | | low PH2O: Charnockite formation from Kabbaldurga, south India. Nature 278:511-514 Javoy M (1997) The major...central South African streambed in 1866, and the even more dramatic 83.5-carat Star of South Africa diamond...dubbed kimberlite (Davies 1984; Hazen 1999). The South African kimberlites’ cone-shaped deposits, which...ophiolite-hosted Code Locality Canada C1 Jeffrey Mine, Quebec Carbides* 15 Type** Associated Phases***...Khatanga, Siberia R2 Coal Mine 45, Kopeisk, Urals R3 Is River, Isovsky District, Urals C C I, To MCo CoF |  | | Report (volume) | | Unknown Known to native Americans - A de Ulloa (South America) S Tennant (England) S Tennant (England)...............................................40 Local PGM saturation during chromite growth.............quench to a glass, so HSE metal may also form by local saturation due to a build-up in concentration in...silicate melt, accounting for the low value for DPt. Local PGM saturation during chromite growth Both empirical...involves the development of a redox gradient, owing to local reduction within the mineral–melt interfacial region |
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