 | | Journal (article/letter/editorial) | | subcalcic diopside, 27% garnet, 12.9% phlogopite, 5% bronzite, 0.5% ilmenite, and 0.1% zircon. As this proto-alnoite...present are clinopyroxene-ilmenite intergrowths, bronzite, ilmenite, phlogopite, and minor zircon (NIXON... Unlike kimberlitic garnet megacrysts from Monastery Mine (GURNEYet al., 1979), Cr203 does not increase...Orthopyroxene megacrysts The ortbopyroxene or bronzite megacrysts show slight variation in Mg# from 85...approximately constant. Data for the Malaitan bronzite megacrysts are from NIXON and BOYD(1979). Clinopyroxene-ilmenite |  | | Book | | relevant protective laws and regulations and therefore free for general use. 2132/3130-543210 To my wife,...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. . |  | | Book (volume) | | Diamond-Graphite Ecologite From the Roberts Victor Mine, C. J. Hatton and John J. Gurney .................Granulites and Eclogites From Lesotho, Southern Africa, W. L. Griffin, D. A. Carswell, and P. H. Nixon...Garnet Harzburgite XenolithsFrom the Premier Mine, South Africa, R. V. Danchin ...........................the Bultfontein and De Beers Mines, Kimberley, South Africa, P. J. Lawless, J. J. Gurney, and J. B. Dawson...257 The Ilmenite Associationat the Frank Smith Mine, R.S.A., Jill Dill Pasteris, F. R. Boyd, and P. |  | Kampata, M. D., Moreau, J., Hertogen, J., Demaiffe, D., Condliffe, E., Mvuemba, N. F. (1995) Megacrysts and ultramafic xenoliths from Kundelungu kimberlites (Shaba, Zaire) Mineralogical Magazine, 59 (397) 661-676 doi:10.1180/minmag.1995.059.397.09 | Journal (article/letter/editorial) | | Zaire. They are arranged roughly along two north-south trending alignments. The pipes probably intruded... while Cr-poor garnet, subcalcic diopside and bronzite megacrysts cristallized from fertile asthenosphere...twenty kimberlite pipes outcrop along two north-south trending alignments on the eastern and western borders...kimberlite occurrences from Central and Southern Africa. Kimberlites characteristically contain large isolated...megacrysts can be subdivided in an enstatite and bronzite group on the basis of C a O , A1203, YiO2 and |  | | Journal (article/letter/editorial) | | of Geology, Rhodes University, Grahamstown, South Africa. African Queen Mines Ltd., Box 66 Maun Botswana...bots@gmail.com © 2014 December Geological Society of South Africa ABSTRACT Type II (N-poor) diamonds do not constitute...megacryst magmas. Reduction of boron to the metallic state is ascribed to buffering of the megacryst magma...recovered from an Indian alluvial source, and now SOUTH AFRICAN JOURNAL OF GEOLOGY, 2014, VOLUME 117.2 PAGE...diamond recovered from the Cullinan kimberlite, South Africa. Note the irregular morphology of this stone |  | | Journal (article/letter/editorial) | | megacrysts from the Jagersfontein kimberlite, South Africa J.B. DAWSON' and J.V. SMITH2 'Department o f...megacrysts from the Jagersfontein kimberlite, South Africa. In: W.L. Griffin (Editor), Second International...cm) monomineralic grams of olivine, enstatite/bronzite, clinopyroxene, garnet, ilmenite and phlogopite...Science Publishers B.V. Jagersfontein kimberlite, South Africa, some of the megacrysts, namely large single...for most of the eclogites from the Roberts Victor Mine (Dawson, 1980). With the exception of specimen BD3737C |  | | Journal (article/letter/editorial) | | from 16 intrusions in Lesotho, the Republic of South Africa, and Tanzania have been investigated. The following...The deep-seated discrete nodules of garnet, and bronzite that are found in the kimberlites of northern...Ilmenite-zircon intergrowths are particularly common at Monastery mine (WHITELOCK 1973). Among the inclusions in zircon...ilmenite and phlogopite in the zircons from Kao and Monastery mines. Recently, we again found an inclusion of...of phlogopite in zircon from the Monastery mine (Fig. 1). A semiquantitative analysis proved the mica |  | | 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 |  | | Book (volume) | | STUDY OF THE COGNATE INCLUSIONS OLIVINE ENSTATITE BRONZITE GARNET KELYPHITE - CHEMICAL COMPOSITION OF GARNET...DIAMOND-BEARING ALLUVIAL GRAVELS OF THE UNION OF SOUTH AFRICA DIAMOND-BEARING GRAVELS DRAINAGE WEATHERING...SYSTEMS THE ORIGIN OF THE ALLUVIAL DIAMONDS THE SOUTH-WEST AFRICA DIAMOND DEPOSITS THE VAAL RIVER ALLUVIAL GRAVELS...FONTEIN MINE BRONZITE PERIDOTITE FROM JAGERS facing page 368 97. THI N SECTION (19, x 12) BRONZITE PERIDOTITE...following plate MINE THIN SECTION (8, x 12) BRONZITE PERIDOTITE FROM BuLTFONTEIN 98. MINE ,, ,, 99. THIN |  | | Journal (article/letter/editorial) | | 6 0 ~ by volume) with subordinate enstatite or bronzite with an emerald green chromiferous diopside; small...rocks occur in a variety of tectonic settings. The South African kimberlites and the examples from the Colorado...Alaska are at plate-collision margins; whereas the South Yemen and East African examples are in a crustal-tension... J. B. D A W S O N A N D J. V. SMITH 36 cone south of Lake Natron, in an area characterized by numerous...metasomatized harzburgites and lherzolites in some South African kimberlites. Some pargasites and titanian |  | | 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 |  | | Journal (article/letter/editorial) | | the Mzongwana kimberlite dike, Transkei, southern Africa, are predominantly pyroxenites composed of ilmenite...by application of pyroxene thermobarometry to bronzite discrete nodules. The depth of crystallization...appear to have crystallized from Tirich, olivine-free magma that was probably derived from a kimberlitic...Smith and associated Weltvreden kimberlites in South Africa (Rawlinson and Dawson 1979 ; Pasteris et al...enstatie-ilmenite nodule from the Kampfersdam pipe, South Africa (authors' collection). The Mzongwana suite is |  | | Journal (article/letter/editorial) | | Wesselton and Dutoitspan kimberlite diatremes, S. Africa (WAGNER, 1914; WILLIAMS, 1932), in several other...rocks from the De Beers Mine (WILLIAMS, 1932), mica-apatite rock, Newlands Mine (WAGNER, 1914), phlogopiteeolivine...diopside-phlogopite rock from the Roberts Victor Mine, the minerals of which have MARID-type composition...irregular shape of the ilmenite resulting from solid-state recrystallization. Furthermore, the rock is penetrated...Reconnaissance anallyses were made with a solid-state detector programmed for the Reed-Ware procedure |  | | Journal (article/letter/editorial) | | Eclogites from the Chicundo (Angola) and Lace (S. Africa) kimberlites have been subject to post-equilibrium...kimberlite intrusions of the Roberts Victor Mine and Bellsbank (S. Africa), and from the Mir and Udachnaya kimberlites...partial melting, and Spetsius and Taylor (2002) state that all the Siberian eclogites have been partly...the textures of samples from the Roberts Victor Mine, defining Group I as characterised by rounded garnet...ranging from 0.08 to 0.15 wt.% Na2O in garnet from South African diamondiferous eclogites. McCandless and |  | | Journal (article/letter/editorial) | | sapphirinepargasite rock begin with olivine or bronzite being pseudomorphed by anthophyllite, then part...Spinel - black; olivine white; phlogopite - lined; bronzite - stippled. - 160 TABLE 1 Electron microprobe...16.6 1.14 n.d. n.d. 26.0 7.17 n.d. 0.92 183437 bronzite (4) SiO2 A1203 FeO MnO CaO MgO TiO2 54.4 2.20...unit 4, base of the unit, comprising intergrown bronzite and green spinel. preserved boudins. The base...green spinel symplectic intergrowth, unit 3. (e) Bronzite + blue spinel symplectie intergrowth, unit 4 (thin |  | | Journal (article/letter/editorial) | | Water content, mineral chemistry, and oxidation state of clino- and orthopyroxene xenocrysts and megacrysts...A.; Kakanui, New Zealand; Oahu, Hawaii; and New South Wales, Australia). The xenocrysts are from both...180–600 wt ppm. The samples from Lesotho and New South Wales have considerably lower amounts: ~10–300 wt...contents of xenocrysts and megacrysts from New South Wales vary within a narrow range (clinopyroxene:...water content, mineral chemistry, or oxidation state of the samples. FPA mapping reveals homogenous distribution |  | | Journal (issue) | | with the collection of precious stones to the then South Kensington Museum, now the Victoria a n d Albert... by means of gem materials, of teeth which were free of decay, such materials including gold, diamond...turquoise, rock crystal, obsidian. I n Central and South America the Mayas a n d the nhabitants of Ecuador...near the town of Teapa, 30 miles from Palenque, State of Tobasco. The skull had seven teeth, said to be...described tugtupite as "much rarer than diamond", the local population have visited the drill holes made by |  | | Book (volume) | | rise and development of the diamond mines of South Africa, from an historical, economic and technical...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...had collected specimens from various parts of South Africa for years, it has only been since the publication |  | | Book | | calcite, clay minerals and fragments of crustal and local host country-rock. At Lattavaram the kimberlite...Akimoto and Masaki Akaogi (Institute for Solid State Physics, University of Tokyo, Roppongi 7-22-1, Minato-ku...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 | | ............................ 126 5.3.3.2. West Africa ........................................... 126...11. 6.12. 6.13. 6.14. 6.15. 6.6.3 .1. Diverse South African Kimberlites (Dawson and Smith 1975, Smith...7.2. 2. Compositional Variation of Contamination-Free Kimberlites .......... 7.2 .2 .I. Intra-kimberlite.......................... 437 KIMBERLITES Ex Africa semper aliquid novi. Pliny The Elder, Natural...confluence of the Vaal, Orange, and Riet Rivers of South Africa in 1866-1867. The ebb and flow of prospecting |  | | Journal (article/letter/editorial) | | boninite (magnesian andesite with olivine and bronzite). Recently, Leeman and Scheidegger [17] described...exposed at Iwanaidake are, however, exceptionally free from severe serpentinization and are composed o...olivine of Fo93 to Fo94. Sample IW 202 is pyroxene-free dunite with olivine of Fo93 and contains small amounts...chromian spinel upon annealing, unless the gain of a free oxygen or the loss of an electron occurred in olivine...in the pressure release may be impossible unless free oxygen were available or an electron were lost in |  | | Journal (article/letter/editorial) | | enstatite, Na-Ca enstatite, Tienstatite, high-Ti bronzite) and five different types of clinopyroxene (sub-calcic...containing sub-calcic diopside, Ti-enstatite or high-Ti bronzite, and titanian TABLE I. Modes of rocks in the ...Lesotho (Dawson, 1960). 2. Average and range of 23 South African garnet lherzolites (Mathias et al., 1970)...the depleted ones and theoretically, in a steady-state situation, should be found at greater depths than...and websterites, both garnet-bearing and garnet-free. Some olivine pyroxenites consist of phases that |  | | Journal (article/letter/editorial) | | THE OF KIMBERLEY, VICTOR DIAMOND-BEARING SOUTH AFRICA. HARTOG. WITa x BmLIOORA•'a¾ Or Tar. SUBJECTBY...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...reason only material from the lowest levels in the mine was selected. LOCATION. The diamond mines, which |  | | Book (edition) | | falls; for the most part these times are probably local times though this is not often explicitly stated...containing chondrules, all carry a variable amount of free metal, except for the carbonaceous chondrites, in...nickel and may contain appreciable silicon; olivine-bronzite chondrites, (H-group), contain of the irons is...Meteorites, Universities of California and Arizona State, Berkley, 1975). The carbonaceous chondrites are...pallasites exhibit a considerable volume of silicate-free metal, and some irons carry considerable amounts |  | | Journal (article/letter/editorial) | | present, the uranium content of kimberlites from South Africa (Gurney 1968, Gurney & Hobbs 1973, Fesq et at...1. Uranium content of kimberlites from southern Africa. No. Type Locality· Lesotho KN3a KN131 PHN1356...(Lemph. sat.) Fragmen t in 3a Republic of SOI//h Africa KX-Z basaltic ('black' type) KX-3 bao;altic KX-4...hard micaceou s PHNI855 micaceou . Premier Mine De Beers Mine Bultfonle in Zl-'Ckocgat, E. Griquala nd...Two griquaite nodules from Roberts Victor Mine (South Africa) have been analyzed (Table 2). A fresh specimen |
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