 | | 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) | | 3b7S02.W;O Ultramafic nodules from the Kimberley pipes, South Africa F. R. BOYD Geophysical Laboratory, Carnegie...from the Kimberley pipes differ from suites collected in a number of other areas in southern Africa in two...low-temperature (< 1100°C) peridotites from the Kimberley pipes have textures ranging from coarse to fluidal...mosaic-porphyroclastic. In most nodule suites from southern Africa and elsewhere in the world, these low-temperature...Petrographic and electron microprobe study of the Kimberley peridotites shows that they are depleted in basaltic |  | | 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...collect during my many visits to all parts of South Africa where kimberlite deposits occurred and the filing...was necessary to file * "The Diamond Mines of South Africa," by Gardner F. Williams. V . Vl l I I...my attention from the time of my arrival in South Africa was the accidental and cognate inclusions found |  | | Journal (article/letter/editorial) | | metasomatised MARID rock in a kimberlite peridotite FRANCES G. WATERS*, Department between and xenolith...(Received February University Cape 7700, South of Cape Town, Africa 17, 1989; Accepted April 19...is an abrupt textural transition from a MARID (phlogopite-K-richterite-diopside) portion, to a 2 cm rind...rind of peridotite (olivine pseudomorphs phlogopite-K-richterite-diopside-chromite). Small, but significant...(basaltic) kimberlites, and in particular from the Kimberley group of pipes. However, the Newlands pipes have |  | | 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 |  | WHITE, J. L., SPARKS, R. S. J., BAILEY, K., BARNETT, W. P., FIELD, M., WINDSOR, L. (2012) KIMBERLITE SILLS AND DYKES ASSOCIATED WITH THE WESSELTON KIMBERLITE PIPE, KIMBERLEY, SOUTH AFRICA. South African Journal of Geology, 115 (1) 1-32 doi:10.2113/gssajg.115.1.1 | Journal (article/letter/editorial) | | ASSOCIATED WITH THE WESSELTON KIMBERLITE PIPE, KIMBERLEY, SOUTH AFRICA J.L. WHITE, R.S.J. SPARKS, K. BAILEY Department...seroster99@hotmail.com © 2012 March Geological Society of South Africa ABSTRACT Field relations, petrography and bulk...complex exposed in water tunnels at Wesselton Mine, Kimberley. The sill complex, together with associated...of calcite, perovskite, spinel, serpentine and phlogopite, with variations from rocks rich in olivine microphenocrysts...pseudomorphed olivine, replaced calcite, apatite and phlogopite in the groundmass and thereby changed the bulk |  | | Journal (article/letter/editorial) | | from 16 intrusions in Lesotho, the Republic of South Africa, and Tanzania have been investigated. The following...material studied (especially the zircons from the Kimberley mines) was subangular in shape, with one or a...predominate. Zircons from the Kimberley group of intrusions (i.e., Kimberley, Dutoitspan, De Beers, Wesselton...bronzite that are found in the kimberlites of northern Lesotho also show some fractures and cracks (NlxoN...with respect to the abundance of zircon in the Kimberley and Frank Smith mines, he admitted that zircon |  | 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) | | geochemistry of the Bultfontein kimberlite (Kimberley, South Africa) Andrea Giuliani, Ashton Soltys, David...geochemistry of the Bultfontein kimberlite (Kimberley, South Africa), Chemical Geology (2016), doi:10.1016/j...the SC RI PT Bultfontein kimberlite (Kimberley, South Africa) Andrea Giuliani1,2,3*, Ashton Soltys1...(BK) from the Bultfontein kimberlite (Kimberley, South MA Africa). Sample BK consists of abundant macrocrysts...(micro-) ED phenocrysts of olivine and lesser phlogopite, smaller grains of apatite, serpentinised monticellite |  | | Journal (article/letter/editorial) | | metamorphism, and metasomatism: The complex history of South African upper-mantle symplectites Stephen W. Field*...clinopyroxene, pyrope garnet, Mg-rich amphibole, and phlogopite, are common in depleted peridotites recovered...symplectites. Symplectites containing amphibole and phlogopite are pyroxene + spinel ± garnet symplectites that...are found in the Horoman peridotite complex in northern Japan (Takahashi and Arai 1989), in ultramafic...(Zuyev 1971). In a study of peridotites from South Africa (Field and Haggerty 1994), up to one third of |  | | Journal (article/letter/editorial) | | of Geochemistry, University of Cape Town, Rondebosch 7700 (South Africa) Received February 20, 1985; revised...mantle beneath the northern Lesotho margin of the Archaean craton in southern Africa are inferred to have...garnet lherzolite xenoliths from beneath the Kimberley area in the craton interior display internal isotopic...Cretaceous age, Bultfontein (Kimberley district) and Thaba Putsoa (northern Lesotho), was undertaken with...compositions indicate haba Putsoa Bultfontein (Kimberley cluster) 0 i . . . . 500 i km Fig. 1. Sketch |  | 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) | | Examples from the Wesselton and De Beers mines, South Africa, and Somerset Island, Canada C.B. SMITH’, ‘Bernard...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)...Examples from the Wesselton and De Beers mines, South Africa, and Somerset Island, Canada. Chem. Geol. (Isot...the Wesselton kimberlite and one of two De Beers Mine samples, while a second De Beers sample gave a younger |  | Hetman, Casey M., Scott Smith, Barbara, Robey, Jock, Nkotsi, Teboho, Mohapi, Mohapi, Mohapi, Thabang (2018) Letšeng diamond mine, Lesotho: a variant of Kimberley-type pyroclastic kimberlite emplacement. Mineralogy and Petrology, 112. 365-382 doi:10.1007/s00710-018-0642-3 | Journal (article/letter/editorial) | | ORIGINAL PAPER Letšeng diamond mine, Lesotho: a variant of Kimberley-type pyroclastic kimberlite emplacement...Springer Nature 2018 Abstract The Letšeng Diamond Mine comprises two ~91 Ma kimberlite pipes. An update...resedimented volcaniclastic kimberlite (RVK), Kimberley-type pyroclastic kimberlite (KPK), coherent kimberlite...are compared with KPK occurrences from southern Africa and worldwide. Many features of the Letšeng pipes...widespread Cretaceous kimberlite province of southern Africa. The differences displayed at Letšeng compared |  | | 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...metasomatism in the mantle (i.e., high Cr-Ti phlogopite); (2) entrainment of wall-rock material during...monticellite, calcite micro-phenocrysts, kinoshitalite-phlogopite, barite, and baddeleyite) and the mesostasis...compositions of antecrysts (i.e., high Cr-Ti phlogopite) and magmatic phases (e.g., olivine rims, magnesian |  | | Journal (article/letter/editorial) | | Constraints on kimberlite ascent mechanisms revealed by phlogopite compositions in kimberlites and mantle xenoliths...Keywords: Kimberlite Phlogopite Zoning Magma ascent Mantle xenoliths Kimberley a b s t r a c t Kimberlite...of kimberlite melts remain poorly constrained. Phlogopite is one of the few minerals that preserves a history...compositional data for phlogopite from the Bultfontein kimberlite (Kimberley, South Africa; i.e. the kimberlite...type-locality) and from entrained mantle xenoliths. Phlogopite macrocrysts (~ N 0.3–0.5 mm) and microcrysts |  | | 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) | | Æ A.P. Le Roex Trace element geochemistry of phlogopite-rich mafic mantle xenoliths: their classification...classification and their relationship to phlogopite-bearing peridotites and kimberlites revisited Received: 9...magmas from the Kimberley area of South Africa have sampled two main types of phlogopite-rich mafic xenoliths...characterised by the mineral association mica (phlogopite)–amphibole (K-richterite)–rutile–ilmenite–clinopyroxene...characterised by the mineral association mica (phlogopite)–ilmenite– clinopyroxene–minor rutile. The two |  | | Journal (article/letter/editorial) | | PERIDOTITE NOTE ON THE OF KIMBERLEY, VICTOR DIAMOND-BEARING SOUTH AFRICA. HARTOG. WITa x BmLIOORA•'a¾...examination. During a stay of threeyears,however,at the mine, from a careful comparisonof publisheddescriptions...study could not have been extended to all of the South African pipes but it is believedthat the presentdescriptionwill...north, south, east, west and center of certain working levelsin the De BeersMine, Kimberley, South Africa...not gone so far 438 NOTE ON PERIDOTITE OF KIMBERLEY. 439 as to producecrumbling. This difficultyhad |  | | Book | | 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. . . . . . . . . .... . . . . . . . . . . . . . . . Southern Africa . . . . . . . . . . . . . . . . . . . . . U.S.S.R. . |  | | Journal (article/letter/editorial) | | The Isotopic Composition of Strontium in Some South At)ican Kimberlites ROGE~I-I. MITCNELL D e p a r...work a number of fresh whole rock samples from South African pipes and fissures have been analysed in...Wesselton kimberlite pipe, one of the important Kimberley group of pipes. I t is emplaced in a thick series...homogenise kimberlites, but have undoubtedly caused some local Rb and Sr redistribution. The intrusions appear...required. Of particular importance with regard to South African kimbertite is the possible assimilation |  | | Journal (article/letter/editorial) | | SPINEL MACROCRYSTS FROM KIMBERLITES IN SOUTHERN AFRICA DANIEL J. SCHULZE§ 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)...partitioned into a different phase, such as metasomatic phlogopite. Such Cr-rich macrocrysts are more common in...Unusually Fe- and Ni-rich macrocrysts unique to the Lace mine are from Fe-rich orthopyroxene-bearing peridotites |  | | Journal (article/letter/editorial) | | Phlogopites and Potassic Richterites from Mica Nodules in South African Kimberlites Ken-ichiro Aoki Institute of...and Wesselton mines, Kimberley can be divided into two groups: diopside-phlogopite nodules and potassie...potassie riehterite-phlogopite nodules. The latter is characterized by the presence of abundant potassic richterite...nodular aggregates of phlogopite, which are usually termed mica nodules or phlogopite nodules, have been...found in kimberlites from the Kimberley district, South Africa. Phlogopite is commonly present in kimberlites |  | 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) | | t h o s 40 Ar/39Ar-ages of phlogopite in mantle xenoliths from South African kimberlites: Evidence...lithosphere Ar–Ar dating Metasomatism Southern Africa a b s t r a c t We applied the 40Ar/39Ar dating...garnet bearing) from the mines of Bultfontein (South Africa), Letseng-laTerae and Liqhobong (Lesotho). Argon...meaningful and assigned to metasomatism of the local cratonic mantle during the advent of Kibaran orogenesis...consequences of our findings are: (i) The argon system of phlogopite can remain closed for long time scales, even |  | | Journal (article/letter/editorial) | | Origin of Phlogopite and Potassic Richterite Bearing Peridotite Xenoliths from South Africa Ken-ichiro...Abstract. Peridotite xenoliths containing primary phlogopite with or without potassic richterites as major...granular type garnet peridotite xenoliths from South Africa and Lesotho, except for an abnormally high content...content of K20 in the former. Phlogopite and potassic richterite are thought to have the following genesis:...peridotites at a depth from 170 to 100 km suffered local introduction of a potash-rich fluid, and garnet |  | | Journal (article/letter/editorial) | | pipe to 1000 m depth, Renard Mine, Québec, Canada: insights into Kimberley-type pyroclastic kimberlite...Corporation’s Renard Mine. Renard 2 is infilled with two distinct kimberlite units that exhibit Kimberley-type pyroclastic...are consistent with those described at numerous Kimberley-type pyroclastic kimberlite localities around...Kimberlite . Economic geology . Emplacement . Renard . Kimberley-type pyroclastic kimberlite Introduction The...in 2018 at Stornoway Diamond Corporation’s Renard Mine which was commissioned in 2016 for a capital cost |  | | 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...presence of additional water), were predominantly phlogopite and diopside (4- K-richterite, + ilmenite, +...thought to be either partial melts of metasomatised phlogopite peridotite, or small volume asthenospheric melts...ascent. Introduction A distinctive group of phlogopite-dominated xenoliths found in southern African |
|
