| | Journal (article/letter/editorial) | Kimberlite-hosted diamond deposits of southern Africa: A review Matthew Field a,ā, Johann Stiefenhofer...Southdale, 2135, South Africa c De Beers Group Services, PO Box 47, Kimberley, South Africa d De Beers Canada...discovery of diamonds in river deposits in central South Africa in the mid nineteenth century, it was at Kimberley...economic and industrial development of southern Africa. Following the discoveries at Kimberley, even more...more valuable deposits were discovered in South Africa and Botswana in particular, but also in Lesotho | | | Journal (article/letter/editorial) | SPINEL MACROCRYSTS FROM KIMBERLITES IN SOUTHERN AFRICA DANIEL J. SCHULZEĀ§ Department of Geology, University...single-crystal macrocrysts in kimberlites from southern Africa (approximately 1500 grains from 20 kimberlites...from a variety of mantle xenoliths from southern Africa and North America (approximately 150 xenoliths)...enriched in Fe, Ti and Cr in many Group-I suites, but chromite xenocrysts from highly metasomatized assemblages...Unusually Fe- and Ni-rich macrocrysts unique to the Lace mine are from Fe-rich orthopyroxene-bearing peridotites | | | Journal (article/letter/editorial) | inclusions from De Beers Pool diamonds, Kimberley, South Africa D. Phillips a,*, J.W. Harris b, K.S. Viljoen...Mines Ltd., P.O. Box 82232, Southdale, 2135, South Africa b Received 27 June 2003; accepted 14 December...important De Beers Pool kimberlites in Kimberley, South Africa, are characterised by harzburgitic compositions...intergrowths, with garnet + orthopyroxene F chromite F olivine and chromite + olivine assemblages dominant. More...garnets exhibit intermediate compositions. Most chromite inclusions contain 63 ā 67 wt.% Cr2O3 and < 0 | | | Journal (article/letter/editorial) | calculations for Roberts Victor, but hotter than for the Finsch, Kimberley, KoĀefontein and Premier Mines. This...J.J. Gurney Geological Department, University of Cape Town, 7700, Rondebosch, RSA L.R.M. Daniels Nomathata...presently the only diamond producing kimberlite mine in Zimbabwe, where more than 30 kimberlites have...which is a high-grade metamorphic terrane in the northern part of the Kaapvaal craton. The Early Archean...subdivided into three zones separated by faults: the Northern Marginal Zone (NMZ); the Central Zone (CZ); and | | | Book | E) South African Diamond Occurrences 1. Large Kimberlite Mines 1.1 Venetia 1.2 Premier 1.3 Finsch 1.4...Koffiefontein 2. Smaller mineralised kimberlites in South Africa 2.1 The Oaks 2.2 The Zebediela Kimberlites 2... their relative production contributions in South Africa were, primary (kimberlite) 8.63 million carats...Premier mine. The proportion of gems in the West Coast marine deposits is over 98%. The MIBA mine in the...the Congo and the Argyle mine in Australia have an average gem content of only 5%. The dispersal of diamonds | | | Report (issue) | SURVEY OF SOUTH AFRICA COUNCIL FOR GEOSCIENCE GEOLOGICAL SURVEY OF SOUTH AFRICA MINERALOGY OF SOUTH AFRICA:... COUNCIL FOR GEOSCIENCE GEOLOGICAL SURVEY OF SOUTH AFRICA Scientific Editor R.D. Dixon Linguistic and...Council for Geoscience (Geological Survey of South Africa), 280 Pretoria Street, Silverton, Pretoria or........................... 69 5.1 Overview of South African Occurrences ..............................LAYEREDSUITE,BUSHVELDCOMPLEX.... 111 MINERALOGY OF SOUTH AFRICA: TYPE-MINERAL SPECIES AND TYPE-MINERAL NAMES | | | Journal (article/letter/editorial) | classic kimberlite fields of the Kaapvaal (southern Africa) and Siberian cratons (Figs. 3, 4). These two ...higher pressures. Dok: Dokolwayo; Mot: Mothae; Fin: Finsch; Jag: Jagersfontein; Mon: Monastery; Unc: uncertain...China and the Roberts Victor pipe, Kaapvaal, South Africa. Alignment of PāT data along geotherms resembling...localities (e.g., MirāSputnik, Siberia; Ghana, Western Africa; Koffiefontein, Kaapvaal) show a significant scatter...which is similar to or slightly colder than the local xenolith-based geotherm (calculated average difference | | | Journal (article/letter/editorial) | productions from Panda (Ekati Mine) and Snap Lake with those from southern Africa shows significant differences:...only just commenced with the opening of the Ekati Mine (Fig. 1) in 1998. As a consequence, only few systematic...Sable and Jay diatremes, which are part of the Ekati Mine, located about 25 km north of Lac de Gras (see Carlson...new analyses from the Panda diatreme of the Ekati mine. For the Southern Slave (Fig. 1), Pokhilenko et...inclusion data are currently available for the Northern Slave. 1.1. Database We examined 132 inclusions | | | Book (volume) | DIAMONDS OXIDE INCLUSIONS IN DIAMONDS FROM THE FINSCH KIMBERLITE J. J. Gurney, J. W. Harris, PIPE ...ANDWILLIAMSON MINE, TANZANIA H.-M. Tsai, O. A. Meyer, 0. Moreau, and H. Judith Milledge REGIONAL AND LOCAL VARIATIONS...KIFYBERLiTES IN THE COLORADO-WYCā¢ING STATE mINE DISTRICT 42 M. E. McCal!um, C. D. Mabarak, and H. G... K. J. Stracke, 59 OF KIMBEHLITES H.-M. IN SOUTH-EASteRN AUSTRALIA 71 J. Ferguson, anā¢ L. P. Black...CARBONATITEERUPTIVES AT SALTPETRE 111 KOP, SUā¢}tERLAND, SOU'iH AFRICA J. R. ā¢cIver and J. Ferguson Mā¢NERALOGY AND PETROLOGY | | Creighton, Steven, Stachel, Thomas, McLean, Hayley, Muehlenbachs, Karlis, Simonetti, Antonio, Eichenberg, Dave, Luth, Robert (2008) Diamondiferous peridotitic microxenoliths from the Diavik Diamond Mine, NT. Contributions to Mineralogy and Petrology, 155 (5) 541-554 doi:10.1007/s00410-007-0257-x | Journal (article/letter/editorial) | peridotitic microxenoliths from the Diavik Diamond Mine, NT Steven Creighton Ć Thomas Stachel Ć Hayley McLean...diamondiferous peridotitic micro-xenoliths from the A154 South and North kimberlite pipes at Diavik (Slave Craton)...the general peridotitic diamond production at this mine with respect to colour, carbon isotopic composition...production. For garnet inclusions in diamonds from A154 South, the lherzolitic paragenesis, compared to the harzburgitic... 61Ā° a nM 0 100 km 150Ā° The Diavik diamond mine is located within Lac de Gras, approximately 300 | | Jaques, A. L., O'Neill, H. St. C., Smith, C. B., Moon, J., Chappell, B. W. (1990) Diamondiferous peridotite xenoliths from the Argyle (AK1) lamproite pipe, Western Australia. Contributions to Mineralogy and Petrology, 104 (3) 255-276 doi:10.1007/bf00321484 | Journal (article/letter/editorial) | lherzolites but also include garnet harzburgite, chromite - garnet peridotite, a garnet wehrlite, and an...altered spinel peridotite with extremely Cr-rich chromite. In all cases the garnet has been replaced by...1%-0.4% but up to 1.3% KeO in one xenolith. The chromite coexisting with former garnet is Mgand Cr-rich...0.68-0.72, Cr/(Cr + A1) = =0.72-0.79] whereas chromite in the spinel peridotite is even more Cr-rich...USA (McCallum and Eggler /976), 2 from Finsch in South Africa (Shee et al. 1982) and the remainder from | | | Book (volume) | of applied mineralogy of ores from Weigang Iron Mine, China Chen Zhaoxi and Xu Zhenhong 219 CISMMI:...Department of Geology, University ofStellenbosch, South Africa Abstract Electron paramagnetic resonance of...mantle derived lla type diamonds from Finsch pipe, South Africa, and diamonds from the impact craters...Russia, were studied. Generally the crystals from Finsch pipe exhibited a relatively weak fine structure...wave pr-ocesses. Keywords: Diamond, Defects, EPR, Finsch, NlJrcilinger Ries, Popigai INTRODUCTION Defects | | | Journal (article/letter/editorial) | includes exceptionally high Cr2O3 contents in Mg-chromite (70.7 wt.%) and clinopyroxene (3.6 wt.%). Garnet-olivine...Single inclusions Pyrope garnet Orthopyroxene Mg-chromite Olivine Clinopyroxene Inclusions pairs Garnet...orthopyroxene + olivine Garnet + orthopyroxene + chromite Garnet + orthopyroxene + olivine Total diamonds...pyrope garnet inclusions from the Kaapvaal block (Finsch, Gurney et al., 1979; Monastery, Moore and Gurney...Nam-46 Nam-50 Nam-51B inclusion olivine garnet chromite lhz. garnet opx garnet garnet garnet olivine garnet | | | Journal (article/letter/editorial) | inclusion-bearing diamonds from the mines of South Africa and Botswana was begun by Gurney and Harris...diamonds is not known. In early work (1973ā1985) run-of-mine diamonds in the sieve class ā6 + 5 (1.83 mm aperture...the ā6 + 5 sieve class) in run-of-mine productions from South Africa and Botswana are listed in Table...comparison of two studies (1975 and 1985) for the Finsch Mine shows a sevenfold increase in the abundance of...never quantiļ¬ed for such mines as Roberts Victor (South T. Stachel, J.W. Harris / Ore Geology Reviews | | | Journal (article/letter/editorial) | Consolidated Mines, PO Box 82232, 2135 Southdale, South Africa P. McDade Department of Geology Geophysics,...Examples are the Premier and De Beers Mine kimberlites in South Africa (Gurney 1984; Griļ¬n et al. 2003),...strongly depleted harzburgitic mantle, such as the Finsch- or Venetia-type lithosphere. It is conceivable...belt (dark grey) of the Kalahari Craton (Southern Africa). The dashed line gives the outermost boundary...block. Jwaneng, by far the worlds richest diamond mine, is located at the NW rim of the Kaapvaal block | | | Journal (article/letter/editorial) | dynasty (320ā298 B.C.) who regulated an active local diamond trade (Maillard, 1980). Legends associated... Figure 4. A diamond crystal in āblue groundā from South Africa, probably from the collection of Gardner and...Hyderabad, and the only modern producing diamond mine in India exploits the Majhgawan lamproite pipe near...Brazilian era continued until the South African discoveries of the 1860ās, and South African diamond production...until the first decades of the 20th century. South Africa is still a significant producer, but since about | | | Book (edition) | Southern Africa a Collectorās Guide ā Rocks, Minerals and Gemstones of Southern Africa & ā - ... T ~ '' .rats en&nes L of Southern Africa A Collectorās Guide - Struik Publishers (an operating...Ltd.) Struik House Oswald Pirow Street Foreshore, Cape Town 8001 First edition 1976 Second edition 1983...Ā©E.K. Macintosh Cover design by Neville Poulter, Cape Town Lithographic reproduction by Tien Wah Press...Ltd, Singapore Photoset by McManus Bros (Pty) Ltd, Cape Town Printed and bound by Interpak, Pietermaritzburg | | | Journal (article/letter/editorial) | Kaapvaal craton as recorded by subcalcic garnets from Finsch (SA) Marina Lazarov ā, Gerhard P. Brey, Stefan...a c t Twenty four subcalcic garnets from the Finsch mine (SA) were analysed for major and trace elements...ļ¬ndings imply that the present day mantle underneath Finsch (and by inference of the Kaapvaal craton) is the...a heavy mineral concentrate from the Finsch mine (South Africa) and, in addition, from three garnet separates...enrichment events in the subcratonic mantle of South Africa. We also brieļ¬y discussed the origin of subcalcic | | | Book | calcite, clay minerals and fragments of crustal and local host country-rock. At Lattavaram the kimberlite...Iherzolite nodules in kimberlites(from Lesotho and South Africa) and were analysed for isotopic compositions...Extended Abstract, First Kimberlite Conference, Cape Town, 23. Basu, A. R. and Murthy, V. R.(1977) EPSL...University of the Witwatersrand, Johannesburg, 2001, South Africa) Radiometric age determinations were undertaken...undertaken on 15 kimberlite occurrences in Southern Africa, emphasis being placed on a wide areal distribution | | | Journal (article/letter/editorial) | Sciences, University of Cape Town, Rondebosch, 7700, Republic of South Africa of Geological Sciences...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) | mantle: A study of xenoliths from the Finsch mine, South Africa Marina Lazarov ā, Alan B. Woodland, Gerhard...total of 28 peridotite xenoliths from the Finsch mine, South Africa, have been studied to assess the geotherm...for a given pressure. This reļ¬ects heating and local perturbation of the thermal gradient of these mantle...mantle regions. The ĘO2 values of 15 samples from Finsch range from FMQ ā 2.5 to FMQ ā 4.7. There is a steady...observed for ļ¬ve metasomatized peridotites from Finsch. Ā© 2009 Elsevier B.V. All rights reserved. 1. | | | Book | discovery of these rocks in the Orange Free State of South Africa. The name is not a new one: In 1928, Percy Wagner...Orangeites 1.8. Occurrences of Orangeites . 1. 8.1. Finsch . . . . . . . . 1.8.2. Barkly West Region. 1.8...3. Boshof District . . . 1.8.3.1. Roberts Victor 1.8.3.2. New Elands 1.8.4. Winburg District ... 1.8.5...Kroonstad District .. 1.8.6. Swartruggens District. 1.8.7. Dokolwayo .. 1.8.8. Prieska District 1.8.9. Summary...derived from kimberlites were first found in South Africa in October 1869 on the farms Bultfontein and | | | Journal (article/letter/editorial) | Geochemistry, University of Capetown. Rondebosh 7700, South Africa (Received November 19, 1996; accepted in revisedjorm...of Gaborone, the capital of Botswana, southern Africa, a cluster of 11 kimbeflites occurs. Kinny et al...by electron probe at the University of Cape Town, South Africa (Gurney et al., 1995, see also Gurney et...frequency distributions of diamonds from individual South African kimberlites can be placed into two categories...diamonds is rarely observed as at, for example, Finsch, Premier, and Dan Carl (Deines 1980, Deines et | | | Journal (article/letter/editorial) | variations in diamonds from Finsch and Premier kimberlite, South Africa PETER DEINES Department of Geosciences...Geochemistry Department, University of Cape Town, Rondehosch 7700. South Africa and J. W. HARRIS Department...inclusion-containing diamonds from the Premier kimberlite, South Africa, 93 inclusion-containing diamonds and four diamonds...diamond-bearing peridotite xenoliths from the Finsch kimberlite, South Africa was measured. The data suggest a relationship...composition of inclusion minerals in diamonds from the Finsch and Premier kimberlite. Fragments of the diamonds | | | Journal (article/letter/editorial) | the mantle underlying a mobile belt: Venetia, South Africa PETER DEINES,1,* FANUS VILJOEN,2 and J. W. HARRIS3...Geoscience Centre, PO Box 82232, Southdale, 2135, South Africa 3 Division of Earth Sciences, University of...of 199 diamonds from the Venetia kimberlite, South Africa, whose mineral inclusion chemistry had already...multi-modal. Examination of the inclusion chemistry (chromite, olivine, garnet) as a function of the carbon...consists of a core of Archean lithosphere with northern and southern marginal zones which were stabilized |
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