... μm was found as an inclusion in a diamond from the Koffiefontein pipe in South Africa. In addition to the dark green and opaque goldschmidtite, the diamond contained a Cr-rich augite (websteritic paragenesis) and an intergrowth of chromite, Mg-silicate, and unidentified K-Sr-REE-Nb-oxide...

..., Koffiefontein, Jagersfontein, Kaal Vallei, Uintjiesberg) with Monastery virtually the sole root-zone dyke/small-pipe association. The Kimberley cluster contains the Kimberley, De Beers, Bultfontein, Dutoitspan, Wesselton and Kamfersdam pipes. Subsequent to the eruption of the Karoo flood basalts around 183...

...Fig. 11. Composition of microinclusions of the mineral-forming medium in octahedral diamonds from the Internatsional’naya pipe ( 1 ) and different deposits of the world: cuboids from the pipes Internatsional’naya and Udachnaya (Yakutia), Jwaneng (Botswana), Koffiefontein (RSA), Diavik (Canada...

... is also related to the high activity of potassium in the coexisting liquids. Differences in the Si content in the micas from diamonds of the Koffiefontein pipe ( Izraeli et al. 2004 ) and the Diavik mine ( Klein-BenDavid et al. 2006 ) are explainable in terms of the above equilibrium. Higher concentration...

... Zr; several other sharp drops in Zr occur at even higher Nb contents in the Kamfersdam ilmenites. The Klipfontein ilmenites show a smooth curve leading to constant Zr values, rather than a sharp Z + point. The rare ilmenites from the nearby Koffiefontein pipe lie at the upper end of this trend. Some...

... inclusions to be reviewed on a cratonwide scale. Individual eclogitic sulfide inclusions in diamonds from the Kimberley area kimberlites, Koffiefontein, Orapa and Jwaneng have Re-Os isotopic ages that range from ~2.9 Ga to the Proterozoic and display little correspondence with the prominent variations...

...) Preinier mine: Substantial diamonds c) Koffiefontein: Moderate to low grade d) Colossus:Very low grade (After Gurney, 1984) 8 e) Majhgawan plots. JOUR.GEOL.SOC.INDIA, VOL.50,OCT. 1997 r MAJHGAWAN DIAMONDIFEROUS PIPE 447 Table IV . Majhgawan Garnet-Chromite Cation normalized Gamet Chromite Si Aivi AllY TilY...

... monitoring network is required to better understand earthquake occurrence. This network should be concentrated in areas with active seismicity such as Ceres and Koffiefontein. Figure 2. ▴ Topography of South Africa together with the recorded seismicity. Historical Earthquakes...

... 2002 ) and Al-celadonite ( Beran 2002 ). ( d ) Mica-bearing diamond KFF-166 from Koffiefontein ( Izraeli et al. 2004 ). EPMA provided the relative abundance of Si, Ti, Al, Fe, Mg, Ca, Ba, Na, K, P, and Cl. The microinclusions detected by EPMA are shallow, subsurface inclusions and are fully...

.... ( 1976 ): A noninflected geotherm for the Udachnaya Kimberlite Pipe, USSR . Carnegie Inst. Wash., Yearb . 75 , 523 – 531 . Boyd , F.R. , Gurney , J.J. & Richardson , S.H. ( 1985 ): Evidence for a 150–200-km thick Archaean lithosphere from diamond inclusion thermobarometry...

... from the 5034 kimberlite pipe of the Gahcho Kué mine—a joint venture between the De Beers Group and Mountain Province Diamonds Inc.—in the Northwest Territories (63°26′04″N, 109°11′10″W) of Canada. The Gahcho Kué kimberlite cluster comprises four main pipes: 5034, Tesla, Hearne, and Tuzo. The 5034...

... of ferropericlase (Mg,Fe)O and the (Mg,Fe)SiO 3 phase, which was interpreted as Mg(Fe)Si-perovskite, was detected in diamond of the Koffiefontein pipe ( Scott Smith et al., 1984 ). Experimental data demonstrate that olivine, the principal mantle mineral, transforms into wadsleyite—a high-pressure modification...

... at some localities (Jagersfontein: −10 to +7, Orapa: −11 to +10, Mwadui: +10, Koidu: +8 to +14, Koffiefontein: −4 to −1), are not present in the Klipspringer data. Diamond inclusion sulfides from the Mir and 23 rd Party Congress Pipes, Siberia display a total δ 34 S range of −2 to +5‰ ( Rudnick et al...

..., Orapa Airport pan and Seta). Primary magmatic kimberlite and CROL mines/deposits as follows: Mu, Murowa; Or, Orapa; Ve, Venetia; Jw, Jwaneng; Cu, Cullinan; Vo, Voorspoed; Fi, Finsch; Ki, Kimberley pipes; Ko, Koffiefontein; Ja, Jagersfontein; Le, Letšeng. Mercator map projection. ...

... in ancient and thick continental lithosphere, forming intrusive sheets and composite pipes, commonly in clusters. Despite their rarity, kimberlites have attracted considerable attention because they entrain not only abundant mantle fragments but also diamonds, which can provide a uniquely rich picture...

... ), and with approximately 1 km removed by erosion, is smaller than the kimberlite pipes of comparable age in Botswana, but larger in area than the more deeply eroded pipes in Kimberley and Koffiefontein ( Hawthorne 1975 ). Mined initially by open cast methods to - 275 m, the underground operation extended to 1200 m...