 | | 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...deposits in central South Africa in the mid nineteenth century, it was at Kimberley where the volcanic...industrial development of southern Africa. Following the discoveries at Kimberley, even more valuable deposits...deposits were discovered in South Africa and Botswana in particular, but also in Lesotho, Swaziland and Zimbabwe |  | | Journal (article/letter/editorial) | | magma evolution of the De Beers dyke (Kimberley, South Africa) Ashton Soltys 1 & Andrea Giuliani 1,2...intrusion bordering the De Beers pipe (Kimberley, South Africa). Petrographic features and mineral compositions...phases (i.e., olivine rinds, Fe-Ti-rich spinels, perovskite, apatite, monticellite, calcite micro-phenocrysts...intrusions of the main Kimberley pipes (i.e., Wesselton, De Beers, Bultfontein). However, the composition...distinct from those in ‘evolved’ intrusions of the Kimberley cluster (e.g., Benfontein, Wesselton water tunnel |  | Giuliani, Andrea, Soltys, Ashton, Phillips, David, Kamenetsky, Vadim S., Maas, Roland, Goemann, Karsten, Woodhead, Jon D., Drysdale, Russell N., Griffin, William L. (2017) The final stages of kimberlite petrogenesis: Petrography, mineral chemistry, melt inclusions and Sr-C-O isotope geochemistry of the Bultfontein kimberlite (Kimberley, South Africa) Chemical Geology, 455. 342-356 doi:10.1016/j.chemgeo.2016.10.011 | Journal (article/letter/editorial) | | isotope geochemistry of the Bultfontein kimberlite (Kimberley, South Africa) Andrea Giuliani, Ashton Soltys...isotope geochemistry of the Bultfontein kimberlite (Kimberley, South Africa), Chemical Geology (2016),...geochemistry of the SC RI PT Bultfontein kimberlite (Kimberley, South Africa) Andrea Giuliani1,2,3*, Ashton...hypabyssal sample (BK) from the Bultfontein kimberlite (Kimberley, South MA Africa). Sample BK consists of...apatite, serpentinised monticellite, spinel, perovskite, phlogopite and ilmenite in a matrix of calcite |  | | Book | | not attempted to describe diamond prospecting and mining and, although I have attempted to give some of...with whose research groups at the universities of Cape Town and Chicago I have had long and fruitful collaboration...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. . . . . . . . . . |  | | Book | | Phase 5. Sample Treatment D) World Production E) South African Diamond Occurrences 1. Large Kimberlite...Finsch 1.4 Kimberley 1.5 Koffiefontein 2. Smaller mineralised kimberlites in South Africa 2.1 The Oaks... their relative production contributions in South Africa were, primary (kimberlite) 8.63 million carats...suggest approximately 40% for the Kimberley mines and 55% for Premier mine. The proportion of gems in the...deposits is over 98%. The MIBA mine in the Congo and the Argyle mine in Australia have an average gem |  | | Journal (article/letter/editorial) | | Phlogopite Zoning Magma ascent Mantle xenoliths Kimberley a b s t r a c t Kimberlite magmas are of economic...data for phlogopite from the Bultfontein kimberlite (Kimberley, South Africa; i.e. the kimberlite type-locality)...microcrysts (between ~0.1 and 0.3 mm) in the Bultfontein kimberlite display concentric compositional zoning...and groundmass grains in the Bultfontein kimberlite (Kimberley, South Africa (Fig. 1); i.e. the kimberlite...xenoliths entrained by the Kimberley kimberlites. Phlogopite grains in the Bultfontein kimberlite exhibit multiple |  | | Journal (article/letter/editorial) | | Department of Geochemistry University of Cape Town, Republic of South Africa arro R. V. DnNcurrq2 Anglo-American...ResearchLaboratory Crown Mines, Johannesburg, Republic of South Africa Abstract Two new opaquemineralsare describedfrom...Presentaddress: Stockdale Prospectint-Ltd., 60 Wiison Street, South yarra, Victoria 3141,Australia. 0003-004x/83/0505-M94$02...from the De Beers kimberlite in the Republic of South Africa (RSA) and the mineral has since been recognized...accessory mineral in veined peridotites from nearby Bultfontein. Mathiasite, the K member has thus far been recognized |  | | Report (chapter) | | nonetheless a fundamental division apatite, spinels, perovskite and ilmenite. The within the kimberlite clan...minerals are commonly altered 1 In the case of S Africa, the micaceous by deuteric processes, mainly serpentinisation...by other high-K minor intrusives, as at the Helam Mine in the Swartruggens area of the western Transvaal...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) | | University of the Witwatersrand, Johannesburg 2001 (South Africa) (Received April 5, 1982; revised and accepted...content (notably perovskite) and whole-rock kimberlite samples. U/Pb ratios in perovskite in the matrix...Virtually all kimberlites contain fine-grained perovskite as a groundmass mineral. Its occurrence is either...fission-track studies showing that especially secondary perovskite can be highly enriched in V, while other groundmass...matrix mineralogy and the distribution of matrix perovskite can be extremely variable. Where this is so, |  | | Book (volume) | | rise and development of the diamond mines of South Africa, from an historical, economic and technical...days on the diamond fields when the mines in the Kimberley and Jagersfontein areas were the only diamond...information of a mining nature, which included, besides the data on under ground and surface mining operations...crystals with the object, if possible, of deter mining the conditions under which the diamond crystal...collect during my many visits to all parts of South Africa where kimberlite deposits occurred and the filing |  | Smith, C.B., Allsopp, H.L., Garvie, O.G., Kramers, J.D., Jackson, P.F.S., Clement, C.R. (1989) Note on the UPb perovskite method for dating kimberlites: Examples from the Wesselton and De Beers mines, South Africa, and Somerset Island, Canada. Chemical Geology: Isotope Geoscience section, 79 (2). 137-145 doi:10.1016/0168-9622(89)90016-x | Journal (article/letter/editorial) | | Printed in The Netherlands Note on the U-Pb perovskite method for dating kimberlites: Examples from...from the Wesselton and De Beers mines, South Africa, and Somerset Island, Canada C.B. SMITH’, ‘Bernard H...American Research Laboratories, Crown Mines 2025 (South Africa) 3Department of Geology, University of Zimbabwe...0001 (South Africa) ‘Anglo American Corporation, Johannesburg 2000 (South Africa) 2050 (South Africa)...S. and Clement, C.R., 1989. Note on the U-Pb perovskite method for dating kimberlites: Examples from |  | | Journal (article/letter/editorial) | | case study of the archetypal Bultfontein kimberlite (Kimberley, South Africa) Ashton Soltys, Andrea Giuliani...case study of the archetypal Bultfontein kimberlite (Kimberley, South Africa). The address for the corresponding...case study of the archetypal Bultfontein kimberlite (Kimberley, South Africa) a SC RI PT Ashton Soltysa*...kimberlite (sample BK-1) from the MA Bultfontein mine (Kimberley, South Africa). The accuracy of this whole-rock...evolution. The primitive melt parental to the Bultfontein kimberlite is estimated to contain 17.4- AC |  | | 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) | | from 17 kimberlite localities from SC southern Africa, Canada, Greenland and Russia. These data show...rims in each kimberlite locality, cluster (e.g., Kimberley) and, potentially field (e.g., Lac de Gras), form...different areas suggest contribution from a range of local processes, such as variable source composition,...filtering PT E 3.3. Canada D 3.2. Southern Africa 3.4. West Greenland CE 3.5. Russia 4. Origin...dolomite), serpentine, olivine, monticellite, spinel, perovskite, Mg-ilmenite, apatite and PT E phlogopite. |  | | Journal (article/letter/editorial) | | zirconolite, and alteration of vein ilmenite to perovskite suggest reaction with an evolving carbonatitic...in relatively small geographical areas such as northern Tanzania, xenoliths from dierent eruptive sites...xenoliths from kimberlite, specimens from Kimberley, South Africa have formed the basis of several metasomatism...veined and metasomatised harzburgite xenolith from Kimberley which provides evidence for further metasomatic...baddeleyeite and zirconolite, and of ilmenite by perovskite. Sample description J. B. Dawson (&) á P. G |  | | Journal (article/letter/editorial) | | pyroxene-ilmenite xenolith from the Weltevreden mine, which they suggest is also genetically related...ilmenites from the Mayeng Kimberlite Sills, South Africa (adapted from Apter et al. 1984). Solid circles...suite of ilmenite megacrysts from west Africa and South Africa. However, he notes (Haggerty, pers. comm...in euhedral 247 olivine crystals and matrix perovskite and titanomagnetite (Pasteris (1980); Shee (1984);...to be particularly abundant inclusions in the Bultfontein kimberlite. Ilmenite is also present as a metasomatic |  | | Journal (article/letter/editorial) | | Sciences, Macquarie University, North Ryde, 2109, New South Wales, Australia 3 Centre for Microscopy, Characterisation...to Eocene archetypal kimberlites from southern Africa, Lac de Gras (Canada) and Alto Paranaiba (Brazil)...occur in the source of kimberlites from southern Africa, Lac de Gras and Alto Paranaiba, or that the recycled...the analysis of pristine magmatic phases (e.g., perovskite) either physically separated or by in situ techniques...kimberlites and related megacrysts from southern Africa revealed elevated 206 Pb/204Pb ratios (Smith |  | Giuliani, Andrea, Phillips, David, Maas, Roland, Woodhead, Jon D., Kendrick, Mark A., Greig, Alan, Armstrong, Richard A., Chew, David, Kamenetsky, Vadim S., Fiorentini, Marco L. (2014) LIMA U–Pb ages link lithospheric mantle metasomatism to Karoo magmatism beneath the Kimberley region, South Africa. Earth and Planetary Science Letters, 401. 132-147 doi:10.1016/j.epsl.2014.05.044 | Journal (article/letter/editorial) | | metasomatism to Karoo magmatism beneath the Kimberley region, South Africa Andrea Giuliani a,∗ , David Phillips...titanate U–Pb geochronology mantle metasomatism Kimberley Karoo magmatism a b s t r a c t The Karoo igneous...igneous rocks (174–185 Ma) of southern Africa represent one of the largest continental flood basalt provinces...xenoliths sampled by post-Karoo kimberlites in southern Africa. Here we report U–Pb ages for lindsleyite–mathiasite...xenoliths from the ∼84 Ma Bultfontein kimberlite (Kimberley, South Africa), located in the southern part |  | Fitzpayne, Angus, Giuliani, Andrea, Phillips, David, Hergt, Janet, Woodhead, Jon D., Farquhar, James, Fiorentini, Marco L., Drysdale, Russell N., Wu, Nanping (2018) Kimberlite-related metasomatism recorded in MARID and PIC mantle xenoliths. Mineralogy and Petrology, 112. 71-84 doi:10.1007/s00710-018-0573-z | Journal (article/letter/editorial) | | the sample (0.70814 ± 0.00002) and the host Bultfontein kimberlite (0.70432 ± 0.00005), suggesting that...southern African kimberlites and orangeites from the Kimberley and Barkly West areas. MARID and PIC rocks are...lithospheric mantle, which have been recovered from the Kimberley and other southern African kimberlites (Grégoire...samples studied here originate from the Kimberley kimberlites (Bultfontein, Wesselton, De Beers, and Kamfersdam)...localities are situated in or close to the town of Kimberley, in the Western terrane of the Kaapvaal craton |  | | Journal (article/letter/editorial) | | Roberts Victor, but hotter than for the Finsch, Kimberley, Koefontein and Premier Mines. This is ascribed...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 |  | Soltys, Ashton, Giuliani, Andrea, Phillips, David, Kamenetsky, Vadim S., Maas, Roland, Woodhead, Jon, Rodemann, Thomas (2016) In-situ assimilation of mantle minerals by kimberlitic magmas — Direct evidence from a garnet wehrlite xenolith entrained in the Bultfontein kimberlite (Kimberley, South Africa) Lithos, 256. 182-196 doi:10.1016/j.lithos.2016.04.011 | Journal (article/letter/editorial) | | xenolith entrained in the Bultfontein kimberlite (Kimberley, South Africa) Ashton Soltys, Andrea Giuliani...xenolith entrained in the Bultfontein kimberlite (Kimberley, South Africa), LITHOS (2016), doi: 10.1016/j...xenolith entrained in SC RI the Bultfontein kimberlite (Kimberley, South Africa). Ashton Soltys1,*, Andrea...kbar (~140-145 km)] from the Bultfontein kimberlite (Kimberley, South Africa). This vein assemblage is dominated...from the Bultfontein kimberlite, as well as perovskite from the other kimberlites in the Kimberley area. |  | | Journal (article/letter/editorial) | | lamproite Frances G. Waters Department of Geochemistry, University of Cape Town, Rondebosch, Cape 7700,... South Africa Abstract. Chemical, mineralogical and isotopic studies have been made on nodules of the...which are mostly from Bultfontein, with some from other pipes of the Kimberley cluster, and two from...from Newlands, ~ 60 km north-west of Kimberley. Olivine is absent from MARID rocks and enstatite is only...sulphides, unnamed titanate, calcite, sphene, perovskite and arfvedsonite have been identified, some of |  | | Journal (article/letter/editorial) | | the Premier diatreme root (Cullinan Diamond Mine, South Africa): New insights to mineralogical-genetic classifications...the Premier diatreme root (Cullinan Diamond Mine, South Africa): New insights to mineralogical-genetic classifications...the Premier diatreme root (Cullinan Diamond Mine, South Africa): New insights to mineralogical-genetic classifications...University of AN Johannesburg, Auckland Park 2006, South Africa US 1 CR Ashish Dongre1, * and Sebastian...kimberlite dykes when applying monticellite and perovskite oxybarometry, which probably reflects US significant |  | Hopp, Jens, Trieloff, M., Brey, G.P., Woodland, A.B., Simon, N.S.C., Wijbrans, J.R., Siebel, W., Reitter, E. (2008) 40Ar/39Ar-ages of phlogopite in mantle xenoliths from South African kimberlites: Evidence for metasomatic mantle impregnation during the Kibaran orogenic cycle. Lithos, 106 (3) 351-364 doi:10.1016/j.lithos.2008.09.001 | Journal (article/letter/editorial) | | Ar/39Ar-ages of phlogopite in mantle xenoliths from South African kimberlites: Evidence for metasomatic mantle...lithosphere Ar–Ar dating Metasomatism Southern Africa a b s t r a c t We applied the 40Ar/39Ar dating...(dominantly garnet bearing) from the mines of Bultfontein (South Africa), Letseng-laTerae and Liqhobong (Lesotho)...meaningful and assigned to metasomatism of the local cratonic mantle during the advent of Kibaran orogenesis...The cratonic lithospheric mantle below southern Africa may have been frequently influenced by different |  | | Journal (article/letter/editorial) | | values between these carbonates and the coexisting perovskite, a robust magmatic phase. However, this study...87Sr/86Sr ratios of primary carbonates and coexisting perovskite (e.g., calcite laths-shaped crystals with 87Sr/86Sr...and coherent kimberlites from localities in South Africa ( We s s e l to n , D e B e e r s , B u l t...to other groundmass phases, such as apatite, perovskite, spinel, monticellite or olivine micro-phenocrysts...response (e.g., dark orange in the Wesselton, or Bultfontein kimberlites, Fig. 1d vs dark brown in the Benfontein |
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