 | | 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-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 |  | | Journal (article/letter/editorial) | | dynasty (320–298 B.C.) who regulated an active local diamond trade (Maillard, 1980). Legends associated... Figure 4. A diamond crystal in “blue ground” 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 1860’s, and South African diamond production...until the first decades of the 20th century. South Africa is still a significant producer, but since about |  | | Journal (article/letter/editorial) | | inclusion in a natural diamond from the Finsch kimberlite pipe of South Africa: a euhedral rhombohedron-shaped...and much of the carbon in the mantle Keywords: Finsch pipe; diamond; magnesite; mineral inclusions; Raman...that such an inclusion assemblage represents a local mineralogic environment, and to investigate the...the Finsch pipe, a major diamond-producing kimberlite mine located 37 km east of Postmasburg, Cape Province...Province, South Africa [7]. The host diamond is a type IaAB octahedron that is 2 mm in diameter. Microscopic |  | | Journal (article/letter/editorial) | | Diamond-Bearing Peridotite Xenoliths from the Finsch Kimberlite, South Africa S.R. Shee l, j.j. Gurney2, and D.N...Geochemistry Department, University of Cape Town, Rondebosch 7700, South Africa 3 Anglo American Research Laboratories...Crown Mines 2025, South Africa Abstract. Two diamond bearing xenoliths found at Finsch Mine are coarse garnet...different to the majority of mineral inclusions in Finsch diamonds. This suggests a different origin for...garnet lherzolites from the Finsch Mine, near Postmasburg, Cape Province, S. Africa. These peridotites join |  | Korolev, N.M., Kopylova, M., Bussweiler, Y., Pearson, D.G., Gurney, J., Davidson, J. (2018) The uniquely high-temperature character of Cullinan diamonds: A signature of the Bushveld mantle plume?. Lithos, 304. 362-373 doi:10.1016/j.lithos.2018.02.011 | Journal (article/letter/editorial) | | gdpearso@ualberta.ca 4 University of Cape Town, Cape Town, South Africa, john.gurney@msgroup.net PT E D...D 5 Petra Diamonds, Bryanston, South Africa, jim@petradiamonds.com February 2017 AC CE Revised for...the lithospheric peridotitic paragenesis are forsterite, enstatite, Cr-pyrope, Cr-augite and spinel;...thermal disturbance. Keywords: Cullinan kimberlite mine, Bushveld Igneous Complex, diamond inclusions, thermobarometry...et al., 2003). Peridotite xenoliths define the local geotherm (Viljoen et al., 2009) consistent with |  | | Journal (article/letter/editorial) | | mantle: A study of xenoliths from the Finsch mine, South Africa Marina Lazarov ⁎, 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 reflects heating and local perturbation of the thermal gradient of these mantle...mantle regions. The ƒO2 values of 15 samples from Finsch range from FMQ − 2.5 to FMQ − 4.7. There is a steady...observed for five metasomatized peridotites from Finsch. © 2009 Elsevier B.V. All rights reserved. 1. |  | | Journal (article/letter/editorial) | | calculations for Roberts Victor, but hotter than for the Finsch, Kimberley, Koefontein 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 |  | Korolev, Nester, Kopylova, Maya, Gurney, John J., Moore, Andy E., Davidson, Jim (2018) The origin of Type II diamonds as inferred from Cullinan mineral inclusions. Mineralogy and Petrology, 112. 275-289 doi:10.1007/s00710-018-0601-z | Journal (article/letter/editorial) | | (22%). The lherzolitic suite contains Cr-pyrope, forsterite, enstatite, clinopyroxene and Cr-spinel formed...Russia 3 University of Cape Town, Rondebosch, Cape Town 7701, South Africa 4 Department of Geology...University, Artillery Rd, Grahamstown 6140, South Africa 5 School of Earth and Ocean Sciences, University...Ealing Crescent, Bryanston, Johannesburg 2021, South Africa Introduction Diamonds are broadly divided into...diamonds from Letšeng-la-Terae kimberlites (Southern Africa) that can be visually identified based on their |  | | 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) | | 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...important De Beers Pool kimberlites in Kimberley, South Africa (28j46VS, 24j48VE). The Kimberley region is...the site of the first diamond discoveries in South Africa, the type locality for Group I (basaltic) kimberlites |  | | Journal (article/letter/editorial) | | relaxation or, in the case of the Kimberley area in South Africa, possibly uplift due to extension in the lithospheric...first kimberlite hosted diamond deposits in South Africa in 1870-1871, diamond formation was initially...lithospheric mantle bracketed by the intersections of the local geotherm with the graphite-diamond transition and...Central Slave Craton yields an TE almost identical local geotherm, underscoring that the Central Slave Craton...calculated temperatures on independently derived local geotherms. Following a similar approach (Fig. 3) |  | Peslier, A.H., Woodland, A.B., Bell, D.R., Lazarov, M., Lapen, T.J. (2012) Metasomatic control of water contents in the Kaapvaal cratonic mantle. Geochimica et Cosmochimica Acta, 97. 213-246 doi:10.1016/j.gca.2012.08.028 | Journal (article/letter/editorial) | | of the Kaapvaal craton from Finsch, Kimberley, Jagersfontein (South Africa), Letseng-La-Terae, and Liqhobong...content of olivines with decreasing pressure at Finsch Mine. H2O/Ce ratios of melts in equilibrium with Kaapvaal...Combined water with Lu–Hf and Sm–Nd isotopic data at Finsch (Lazarov et al., in press-a) and with Ar–Ar phlogopite...and weathering Fig. 1. Simplified map of southern Africa showing the location of the Kaapvaal craton and...Table 2). Trace element analyses by LA-ICPMS on Finsch xenoliths come from Lazarov et al. (in press-a |  | | Journal (article/letter/editorial) | | gives the most accurate information regarding the local geothermal gradient and the thickness of the diamond...56 well equilibrated peridotite xenoliths from South African and Lesotho kimberlites (Boyd and Nixon...temperature (TO'Neill) vs. ln K of mantle xenoliths from South African kimberlites. The data are contoured in pressure...estimating the activities of A. tephroite and B. forsterite in olivine. Comparison of the thermodynamically...thermochemical data from Ottonello et al. (1996). Forsterite and tephroite activities in olivine were derived |  | | Journal (article/letter/editorial) | | Evolution of the South African mantle—a case study of garnet peridotites from the Finsch diamond mine (Kaapvaal...mineral analyses of Finsch mantle peridotites indicate a complex history of the South African sub-continental...cratonization of the Kaapvaal craton underneath Finsch occurred at ~2.6 Ga. The data of this study indicate...enrichment processes during that early history of Finsch SCLM. Calculated degrees of partial melting using...Hf concentrations and subchondritic Lu/Hf, many Finsch peridotites were metasomatically overprinted between |  | | Journal (article/letter/editorial) | | eclogitic garnet inclusions in diamond from the Damtshaa mine, which comprises four kimberlites within the Orapa...eclogite xenoliths worldwide, at the nearby Orapa Mine, and of oceanic crust. Contrary to previous suggestions...relative roles, however, remain controversial for both local and global datasets (e.g., Cartigny, 2005). In contrast...eclogitic garnet inclusions in diamond from the Damtshaa mine, Botswana, to show that there is a clear relationship...the Paleoproterozoic Makondi Fold Belt at the northern margin of the Zimbabwe Craton (Field et al., 2008; |  | | 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; Griffin 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) | | pyrope garnet inclusions from the Kaapvaal block (Finsch, Gurney et al., 1979; Monastery, Moore and Gurney...olivines from the Kaapvaal, in particular the forsterite rich olivines from De Beers Pool (Wilding et...considered here. The spinels are homoge- Fig. 2. Forsterite content in olivine inclusions from Namibia and...1995), Roberts Victor (Gurney et al., 1984b) and Finsch (Gurney et al., 1979). 2.3. Pyroxene Pyroxene inclusions...thermometry for the Kaapvaal is dominated by data from Finsch (Gurney et al., 1979; Deines et al., 1984) which |  | | Journal (article/letter/editorial) | | Dept. of Geochemistry, Univ, of Cape Town, Rondebosch, 7700, South Africa ReceivedJune 24, 1991 / AcceptedOctober...orthopyroxene inclusions (DI) in >60 diamonds from southern Africa, and in concentrate garnets from the host kimberlites...e n e s f r o m > 6 0 diam o n d s f r o m the Finsch, R o b e r t s Victor, Koffiefontein, O r a p a...out at the Dept. of Geocheimstry, University of Cape Town. Most of the inclusions analyzed were > 50/am... (125 ppm) and Ni (47 ppm) in a DI garnet from Finsch; Shimizu and Richardson (1987) show IMP values |  | | 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 (1973–1985) run-of-mine diamonds in the sieve class −6 + 5 (1.83 mm aperture...the −6 + 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 quantified for such mines as Roberts Victor (South T. Stachel, J.W. Harris / Ore Geology Reviews |  | | Report (issue) | | meteorites; may be formed by impact. Association: Forsterite, phlogopite, pyrope, diopside, ilmenite (kimberlite...Minas Gerais, and other states in Brazil. In South Africa, formerly obtained from the Orange and Vaal...From South Africa, in several pipes around Kimberley, at the Finsch mine, near Postmasburg, Cape Province;...Province; from the Premier mine, near Pretoria, and the Venetia mine, Transvaal; about 150 diamondiferous...In China, from pipes at the Wafangdian and Binhai mine, Liaoning Province; at Changma, near Mengyin, Shandong |  | 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) | | microdiamonds only. They contain relatively low forsterite (Fo) [100 Mg/(Mg+Fe)] along with very low MnO...unaltered kimberlite are also characterized by high forsterite contents, which makes a clear difference between...pyrope-bearing diamondiferous peridotites described from South African localities, North America and Aikhal pipe...and Ni (c) contents are presented in ppm vs. forsterite (Fo) content in mol %. Fig. 4. Compositions...diamonds and diamonds from several mines worldwide. Mine Internacionalnaya Aikhal Yubileinaya Komsomolskaya |  | | Journal (article/letter/editorial) | | moore@mineralservices.com © 2004 Geological Society of South Africa ABSTRACT New whole rock chemical and Re-Os...of lithospheric mantle peridotite from southern Africa (Walker et al., 1989; Pearson et al., 1994; 1995;...in on- and off-craton kimberlites from southern Africa. For example, the Redepletion model ages for peridotitic...is only 3.25 Ga (Drennen et al., 1990; Schmitz SOUTH AFRICAN JOURNAL OF GEOLOGY, 2004, VOLUME 107, PAGE...Kaapvaal, for example, Kimberley (Boshoff dumps), Finsch and Newlands (Pearson et al., 1995; Carlson et |  | | 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) | | Ga (Lace), 2.9 Ga (Roberts Victor) and 2.62 Ga (Finsch) coinciding with the collision of cratonic blocks...Yb with Cr2O3/Al2O3 of peridotites from the Finsch mine that may be exemplary for Kaapvaal peridotite...Bushveld (2.05 Ga) (2.6-3.2 Ga) 2.62 Ga, 1.9 Ga Finsch Bellsbank Lineament Kraipan 3.2 Ga Lace 0...30% 40% ol, opx, grt 0.3 0.25 0.2 0.15 0.1 0.05 Finsch 0 0 0.5 1.0 1. 5 Cr2O3/Al2O3 Fig. 2 Covariation...incompatible element Yb with the Cr/Al ratio in Finsch peridotites. The black dots are bulk rock compositions |  | | Journal (article/letter/editorial) | | Department of Geochemistry, University of Cape Town, Rondebosch, South Africa 7700 Received October 2, 1989 / Accepted...Unlike the majority of kimberlites in southern Africa it predates the Stormsberg volcanism which, in...separated from other established mines in southern Africa (Fig. 1) and affords the opportunity to investigate...NiO contents (0.27 - 0.40 wt%) and the range of forsterite compositions (Fo 90.6 Fo 95.6) of the Dokolwayo...diamond inclusion orthopyroxenes recovered from the Finsch, Roberts Victor and Premier kimberlites (Gurney |
|
