 | | Report (chapter) | | minerals are commonly altered 1 In the case of S Africa, the micaceous by deuteric processes, mainly serpentinisation...high-K minor intrusives, as at the Helam Mine in the Swartruggens area of the western Transvaal where...diamondiferous kimberlite and non-diamondiferous sanidine-nepheline-lamprophyre (the so-called 'Male' dyke)...the micaceous and non-micaceous kimberlites in S Africa has recently been recognized on isotopic grounds...versus Nd isotope plot (Fig. 1) on which the Helam Mine lamprophyre dyke, referred to above, falls close |  | | Journal (article/letter/editorial) | | Accessory mineralogy of orangeite from Swartruggens, South Africa A. L. Hammond and R. H. Mitchell Department...occurring as a complex series of dikes at Swartruggens (South Africa), is host to a diversity of accessory...the absence of typomorphic minerals (leucite, sanidine, richterite) of the lamproite clan. Introduction...are rare mantle-derived rocks, unique to southern Africa, representing the product of lithospheric potassic...and R. H. Mitchell accessory minerals in the Swartruggens orangeite, as an initial step in rectifying |  | | 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...dyke – fracture systems in South Africa (Fig. 1; Star, Helam/Swartruggens, Klipspringer) and in opencast...observation, extraction of orientation data from mine maps and by taking oriented samples. Detailed, oriented...petrological and SEM-EDS examina- Fig. 1. Map of southern Africa, showing the locations of Group II kimberlites |  | | Journal (article/letter/editorial) | | Kimberlite-hosted diamond deposits of southern Africa: A review Matthew Field a,⁎, 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 |  | | 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. 8.1. Finsch . . . . . . . . 1.8.2. Barkly West Region. 1.8.2.1. Bellsbank. 1.8.2.2. Sover . . ...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...Biotite Macrocrysts . . 2.1.5. Micas from the Swartruggens Male Lamprophyre 2.1.6. Summary of Mica Compositional |  | | Report (volume) | | Geochemistry of ocean island basalts from the South Atlantic: Ascension, Bouvet, St. Helena, Gough and...Island 269 FITTON, J. G. The Cameroon line, West Africa: a comparison between oceanic and continental...White Mountain alkaline igneous provinces, eastern North America 433 vi Contents UPTON, B. G. J. & EMELEUS...of the classic alkaline provinces, such as East Africa, southern Greenland and the Kola Peninsula, are...example, biotites from the Poohbah Lake syenite in north-western Ontario have been dated at around 2.7 Ga |  | | Book | | collaboration. Much of my fieldwork in southern Africa has been carried out with the cooperation and assistance...7.3 2.8 2.9 Africa . . . . . . . . . . . . . . . . . . . . . . . . . . . . West Africa . . . . . . .... . . . . Central Africa. . . . . . . . . . . . . . . . . . . . . . . East Africa. . . . . . . . . .... . . . . . . . . . . . . . . . Southern Africa . . . . . . . . . . . . . . . . . . . . . U.S.S.R. . .... . . . . . . . .. North America. . . . . . . . . . . . . . . . . . . . .. South America. . . . . . |  | | Book | | California Dept of Geoscience, Purdue University West Lafayette, Indiana 47907 of California, Lawrence...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...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 |  | | 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) | | ANDWILLIAMSON MINE, TANZANIA H.-M. Tsai, O. A. Meyer, 0. Moreau, and H. Judith Milledge REGIONAL AND LOCAL VARIATIONS...KIFYBERLiTES IN THE COLORADO-WYC•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, an• L. P. Black...CARBONATITEERUPTIVES AT SALTPETRE 111 KOP, SU•}tERLAND, SOU'iH AFRICA J. R. •cIver and J. Ferguson M•NERALOGY AND PETROLOGY...MINERAL CHEMISTRY OF A KIMBERLITE FROM THE PR•I•IER MINE: I•iPLICATIONS FOR THE EVOLUTION OF KiFmEHLITIC |  | | Journal (article/letter/editorial) | | Eclogite Mg–Fe garnet + clinopyroxene (±rutile ± sanidine ± sulfides ± native Fe) Mg–Fe garnet + clinopyroxene...clinopyroxene + coesite (±rutile ± sulfides ± sanidine) Mg–Fe garnet + ilmenite (±clinopyroxene) Mg–Fe garnet...the kimberlitic pipes of Monastery (South Africa), Sloan (North America), and XXIII Congress of the CPSU...of diamonds with crystal line inclusions from South African kimberlite pipes [42]. Sulfide inclusions...Moore and Gurney [11] in the Monas tery pipe (South Africa). This finding demonstrated that diamonds could |  | | Book | | (Novosibirsk) International Treasurer: H.O.Meyer (USA) Local Treasurer: 0 AKozmenko (Novosibirsk) Members: V...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...a polymict xenolith from the Kimberley Area, South Africa......40 Eclogites from the Mir kimberlite, Russia:...megacrysts from the Lace (Group II) kimberlite, South Africa..........52 Isotope composition of the sub-continental |  | | Journal (issue) | | • Inclusions in Kenyan rubies from the John Saul mine • Lazurite in Mogok ruby • Snowflakes in Mong Hsu...Paris, France New York, New York Johannesburg, South Africa Al Gilbertson Aaron Palke Wuyi Wang Carlsbad...purchased directly from the miner, but not at the mine site near the Taheza River in Ilakaka. These samples...PS21 was purchased from the miners at the Ambarazy mine; therefore, it is C-type. GIA field gemologists...and prince-electors purchased the gemstones from local stone dealers or goldsmiths and, once the group |  | | Book | | mantle eclogite rock has been found in 1897 at South African kimberlitic pipe. It is now appreciated...FeS2 Quartz SiO2 Rutile TiO2 Ringwoodite Mg2SiO4 Sanidine (K,Na)AlSi3O8 Siderite FeCO3 Spinel MgAl2O4, Cr-spinel...The peridotitic rocks at kimberlitic pipes of South Africa (Mathias et al. 1970) are represented as garnet...garnet-peridotite facies are Cr-spinel, coesite, sanidine, sillimanite, orthopyroxene, kyanite, corundum...and basic upper-mantle-rocks in kimberlites of South Africa and Yakutia make it possible to establish that |  | | Book | | room with a long picture window, illuminated by north-facing daylight. There is a table about twenty metres...Oppmheimer diamond, 253.7 carats, fuund in the Duwirspan mine, Kimberley. It is one of the most beautiful uncur...shown here being hdd by the direcmr of 1he Premier mine, William McHardy, on the day of its discovery. On...president of die mine company. De Beers Archives, Kimberley. carats, found in the Duroitspan mine, Kimberley...develop imo a "hound's-rooch" ( I0). The Jwaneng mine occasionally produces "skeletonised~, partly dissolved |
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