 | | Report (issue) | | 10.361 c = 20.65 Z=3 X-ray Powder Pattern: South Africa. 2.14 (100), 1.44 (100), 2.25 (90), 2.99 (80)...05 ThO2 0.01 (1) Jagersfontein, Bultfontein, and Kolonkwanen kimberlites, South Africa; by electron microprobe...concentrates from metasomatized kimberlite (South Africa). Association: Lindsleyite, olivine, diopside...rutile, Mg–Cr spinel, ilmenite, perovskite, titanite (South Africa); yimengite (Shandong Province, China)...Distribution: From the Jagersfontein diamond mine, Free State, and the Bultfontein diamond mine and Kolonkwanen |  | | Journal (article/letter/editorial) | | 1990 Silicate-bearingrutile-dominatednodulesfrom South African kimberlites: Metasomatizedcumulates DaNrrr...Kampfersdam and Jagersfonteinkimberlite pipes in South Africa contain euhedral olivines and spinels,graphic...may also be magmatic or, together with Nb-rich titanite and calcite, may have .formed by metasomatic reaction...Tollo and Haggerty,1987),and Jagersfontein and Kampfersdam in South Africa (Haggerty, 1983; Schulze,1983;...nodules from the Jagersfonteinkimberlite in South Africa, eachof which contains graphic interyrowths |  | | Journal (article/letter/editorial) | | Koptyuga 3, Novosibirsk, 630090 Russia b Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090...2001; McCammon, 1997; Wilding et al., 1991), West Africa (Joswig et al., 1999; Stachel et al., 2002; Stachel...craton, South Africa (Deines et al., 1991; McDade and Harris, 1999; Moore and Gurney, 1985), South Australia...are inclusions of Ca2SiO4 (larnite) and CaSi2O5 (titanite-structured phase) (Fig. 4), which may represent...Grt/C1 10 1 Monastery (South Africa) Kankan (Guinea) Jagersfontein (South Africa) Saõ-Luiz (Brazil) This |  | | Journal (article/letter/editorial) | | chemistry of new titanates from the Jagersfontein kimberlite, South Africa: Implications for metasomatism...the Jagersfontein kimberlite, 130 km SE of the Kimberley diatrcme complex in the Republic of South Africa...R~CKARD, 1977; JONES et al., 1982). Other grains are free of silicate inclusions (e.g. ilmenites and chromites)...opaque mineral oxide assemblages observed at Jagersfontein have not yet been recognized in metasomites...and ERLANKand RICKARD (I977) from De Beers Jagersfontein kimberlite titanates and Bultfontein, respectively |  | Burness, S., Smart, K.A., Tappe, S., Stevens, G., Woodland, A.B., Cano, E. (2020) Sulphur-rich mantle metasomatism of Kaapvaal craton eclogites and its role in redox-controlled platinum group element mobility. Chemical Geology, 542. 119476pp. doi:10.1016/j.chemgeo.2020.119476 | Journal (article/letter/editorial) | | the Witwatersrand, Private Bag 3, Wits 2050, South Africa *Corresponding author: sarab@uj.ac.za; Tel:...University of Johannesburg, 2006 Auckland Park, South Africa 3 Centre for Crustal Petrology, Department...University, Private Bag of X1, Matieland 7602, South Africa Institut für Geowissenschaften, Universität...Eclogite xenoliths from the Roberts Victor, Jagersfontein, Kimberley (Kamfersdam) and Premier kimberlites...also supported by their relatively reducing redox state. Base metal sulphides from the mid-lithospheric |  | | Journal (article/letter/editorial) | | of garnet xenocrysts from 32 kimberlites from South Africa and North America (4500 garnets), Schulze (1993... The crustal Ca-poor pyropes are essentially Cr-free, however, whereas similarly magnesian and Ca-poor...‘‘pyroxenite’’. Rocks rich in pyroxene and poor in, or free of, olivine are common, though typically not abundant...orthopyroxene, ilmenite, apatite, zircon, phlogopite, titanite, spinel, amphibole, sulphides), and their garnets...well documented in samples from the Roberts Victor Mine (e.g., MacGregor and Carter, 1970; Hatton, 1978; |  | Kaminsky, F., Zakharchenko, O., Davies, R., Griffin, W., Khachatryan-Blinova, G., Shiryaev, A. (2001) Superdeep diamonds from the Juina area, Mato Grosso State, Brazil. Contributions to Mineralogy and Petrology, 140 (6) 734-753 doi:10.1007/s004100000221 | Journal (article/letter/editorial) | | Superdeep diamonds from the Juina area, Mato Grosso State, Brazil Received: 29 May 2000 / Accepted: 30 October...SiO2. CaSi-perovskite inclusions coexist with titanite (sphene), ``olivine'' and native Ni. MgSi-perovskite...(d13C=±11.4&). There are high proportions of nitrogen-free and low-nitrogen diamonds, and the aggregated B...million carats of diamonds each year according to local sources of information. Many of the diamonds recovered...CaSi-perovskite+``olivine'' CaSi-perovskite+``titanite'' MgSi-perovskite+TAPP Majorite+ilmenite+CaTi-perovskite |  | | Book (volume) | | rise and development of the diamond mines of South Africa, from an historical, economic and technical...fields when the mines in the Kimberley and Jagersfontein areas were the only diamond mines being worked...collect during my many visits to all parts of South Africa where kimberlite deposits occurred and the filing...Mines, Limited, and Consulting Engineer to the Jagersfontein and Koffy fontein mines. In later years I felt...was necessary to file * "The Diamond Mines of South Africa," by Gardner F. Williams. V . Vl l I I |  | | Journal (issue) | | and more monotonous tasks. This leaves the Sorter free to concentrate on the more interesting aspects of...is initially used to divide the incoming "run-of-mine" shipments of diamonds into two groups called smalls...and components, a recent example being the solid state microprocessor. This device, which packs the heart...the Novello Prospect a n d the abandoned Twin Star Mine, both of which are located about 17 km N W . of...famous Bikita lithium mine about 80 km east of Fort Victoria. Details of the local geology, together with |  | Reznitsky, L. Z., Sklyarov, E. V., Suvorova, L. F., Barash, I. G., Karmanov, N. S. (2017) V–Cr–Nb–W-Bearing Rutile in Metamorphic Rocks of the Slyudyanka Complex, Southern Baikal Region. Geology of Ore Deposits, 59 (8) 707-719 doi:10.1134/s1075701517080086 | Journal (article/letter/editorial) | | nodules in kimberlite of the Orapa and Jagersfontein pipes in South Africa with a Nb2O5 content up to 13–21...gneiss with V mineralization (schreyerite), Kwale District, Kenya V2O3 Reference 0.07–0.08 1.67–1.79...phlogopite, garnet, tourmaline, chlorite), Hemlo gold district, Canada 1.54–2.04 '' Pan, Fleet, 1991 N.d...phengite, paragonite, chlorite, amphibole, garnet, titanite), Nevado-Filábride, Spain 0.13–1.30 N.d. Sánchez-Vizcaino...mineralization (muscovite, uvarovite, tourmaline, titanite), Barite deposit, Ghattihosahalli, India 0.69–2 |  | | Journal (article/letter/editorial) | | the mantle from fluids rather than in the solid state. These fluids might vary from C-O-H-rich to carbonatitic...B stishovite tetragonal almandine pyrope phase titanite transition zone upper mantle upper mantle/lower...four cratons (Kalahari in southern Africa, Guapore in Brazil, west Africa, and the Slave craton in Canada)...include Yakutia, the SinoKorean craton and the South Australia craton. Experimental data on expected...Moore and Gurney (1985) from the Monastery mine, S. Africa, with EMPA analyses showing Si contents well |  | | Journal (article/letter/editorial) | | 1 Department of Geosciences, The Pennsylvania State University, University Park, PA 16802 USA 2 Department...52 ⫾ 0.18. Results for xenoliths from Jagersfontein, South Africa, are; harzburgite: garnet ␦ 18Ogt ⫽ 5...majoritic garnet inclusions in diamonds from the Jagersfontein, Koffiefontein, and Monestary mines in the Kaapvaal...Leone (Koidu), and the Kaapvaal Craton, South Africa (Jagersfontein). These mafic and ultramafic xenoliths...of sample JX-25, an ultradeep xenolith from Jagersfontein, showing massive clinopyroxene with embayments |  | Barkov, Andrei Y., Fleet, Michael E., Martin, Robert F., Men'shikov, Yuri P. (2006) Sr-Na-REE titanates of the crichtonite group from a fenitized megaxenolith, Khibina alkaline complex, Kola Peninsula, Russia: first occurrence and implications. European Journal of Mineralogy, 18 (4) 493-502 doi:10.1127/0935-1221/2006/0018-0493 | Journal (article/letter/editorial) | | crichtonite-type phases, ferroan freudenbergite, titanite, manganoan ilmenite, Narich phases related to...by powder-XRD scans. A phlogopite grain is nearly free of Fe and unusually rich in F (ca. 6 wt.%; Barkov...marcasite (both Ti-V-rich and Ti-V-free), chalcopyrite (TiV-free); ferroan alabandite (6.0-7.7 wt.% Fe)...enriched in loparite (LOP, white), rutile (RT), titanite (TTN) and silicate minerals (SL, dark gray to...ferroan freudenbergite (with up to 0.45 wt.% Nb2O5), titanite, manganoan ilmenite, Na-REE-rich members of the |  | Meyer, Nicole A., Wenz, Michelle D., Walsh, James P.S., Jacobsen, Steven D., Locock, Andrew J., Harris, Jeffrey W. (2019) Goldschmidtite, (K,REE,Sr)(Nb,Cr)O3: A new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa. American Mineralogist, 104 (9) 1345-1350 doi:10.2138/am-2019-6937 | Journal (article/letter/editorial) | | mineral found in diamond from Koffiefontein, South Africa Nicole A. Meyer1,*, Michelle D. Wenz2, James...in a diamond from the Koffiefontein pipe in South Africa. In addition to the dark green and opaque goldschmidtite...peak at 815 cm–1, which is possibly a result of local ordering of Nb and Cr at the B site. The name goldschmidtite...deep-mantle regions. The Kaapvaal craton in South Africa is host to many diamondiferous kimberlites that...https://doi.org/10.2138/am-2019-6937 craton, South Africa. The holotype specimen is deposited in the Royal |  | | Journal (article/letter/editorial) | | Deines Department of Geosciences, Pennsylvania State University, University Park, PA 16802, USA Editorial...Introduction Alluvial deposits in the Kankan district of Guinea (West Africa) represent one of the very few occurrences...containing majorite garnet inclusions. Data sources: Jagersfontein, Deines et al. (1991); Sao Luiz, Wilding (1990)...composition: the data plot into a triangle with nitrogen-free diamonds occurring over the entire range from ±24...buered by olivine and opx, and, in consequence, a free CO2-¯uid cannot exist. In an eclogitic environment |  | | Journal (article/letter/editorial) | | presently the only diamond producing kimberlite mine in Zimbabwe, where more than 30 kimberlites have...(Hawthorne 1979) and the K1 kimberlite at Venetia, South Africa (Parrish 1989), which are controlled by the...Rollinson, 1993) with small inset map of southern Africa showing the Archean cratons (shaded areas). (1...and perovskite, which is now totally replaced by titanite (Muusha 1997). River Ranch kimberlite has primary...921 primary metasomatic edenite reported in Jagersfontein peridotites, which formed in low-temperature |  | 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) | | Karoo magmatism beneath the Kimberley region, South Africa Andrea Giuliani a,∗ , David Phillips a , Roland...The Karoo igneous rocks (174–185 Ma) of southern Africa represent one of the largest continental flood basalt...xenoliths sampled by post-Karoo kimberlites in southern Africa. Here we report U–Pb ages for lindsleyite–mathiasite...the ∼84 Ma Bultfontein kimberlite (Kimberley, South Africa), located in the southern part of the Karoo...et al., 2007). In the Kaapvaal craton (southern Africa; Fig. 1), Re–Os model ages of mantle xenoliths |  | | Journal (article/letter/editorial) | | Sciences, University of Cape Town, Rondebosch 7701, South Africa a r t i c l e i n f o Article history: Received...the widespread DUPAL geochemical anomaly in the South Atlantic and Indian Oceans. The kimberlites bringing...same diamond from the Koffiefontein kimberlite, South Africa. Scott-Smith et al. (1984) pointed out that...inclusions in diamonds from the Monastery kimberlite, South Africa, with the composition of majoritic garnet believed...Canada (Davies et al., 1999, 2004); Kankan, west Africa 1342-937X/$ – see front matter. Crown Copyright |  | | Journal (article/letter/editorial) | | Department of Geological Sciences, Durham University, South Road, Durham DH1 3LE, UK c Department of Terrestrial...garnet and spinel from opx in sample J8 from Jagersfontein; (b) LET2 garnet with inner fine grained and...Liqhobong, M = Matsoku, TP = Thaba Putsoa, JAG = Jagersfontein. ol = olivine, opx = orthopyroxene, cpx = clinopyroxene...the Kaapvaal lithosphere from U –Pb rutile and titanite thermochronology of lower crustal xenoliths and...cpx-bearing (lherzolites), open symbols are cpx-free (harzburgites). Diamonds stand for garnet peridotites |  | | Journal (article/letter/editorial) | | ilmenite grains. These are Fe±Ti±spinel, rutile, titanite, an unnamed K-titanate and calcite. A Ba-dominant...LIMA from B9297 is comparable to that from Jagersfontein and the Kimberley cluster of kimberlites (Jones...the presence of K±Ti-rich phases (K-titanate, titanite) within ilmenite rims and the ilmenite±LIMA reaction...that the pre-K-metasomatic assemblage was garnet-free. This would be consistent with the very low Al-content... Barrett DR (1975) Rb-Sr age determinations of South African kimberlites. Phys Chem Earth 9: 605±617 |  | | 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 | | carat in ten thousand emerald crys- taken from a mine in North Carolina was transparent. In some respects...grain of Tourmaline and some of the in New York State may waves, impos- a crystal. fine green diopsides...finally latter reaches a point where color is free it is termed a pink sapphire, unless the from a...which a mineral is recognized in the natural state are obliterated in the cutting, and the hardness...carats. Its weight (Plate XVI.) The " Star of the South" was found July, 1853, in the western part of Minas |  | Burnham, A.D., Bulanova, G.P., Smith, C.B., Whitehead, S.C., Kohn, S.C., Gobbo, L., Walter, M.J. (2016) Diamonds from the Machado River alluvial deposit, Rondônia, Brazil, derived from both lithospheric and sublithospheric mantle. Lithos, 265. 199-213 doi:10.1016/j.lithos.2016.05.022 | Journal (article/letter/editorial) | | composition, nitrogen concentration and aggregation state and mineral inclusion chemistry. Variations in morphology...suggest some diamonds have been derived directly from local kimberlites, whereas others have been through extensive...world‘s diamonds are characterised by being inclusion-free (96 - 99 %), and ~ 28 % of inclusions are trace-element... MA NU SC R The Juina region in Mato Grosso State, Brazil, has been studied extensively because of...alluvial diamond deposit, situated in Rondônia State, Brazil, lies approximately 250 km west of the Juina |  | | Journal (article/letter/editorial) | | about 170 km southwest of Jaipur in the Rajasthan State, India (Fig. 1). Since its discovery in 1977, Rampura...Chromite (Cr, Fe, Mg, A1), willemite (Zn, Mn) and titanite (Ti, Ca) were used as standards for oxide analyses...is deduced. The subhedral to euhedral inclusion-free tourmaline crystals (20 pm to 10 mm) occur within...and - 5 7 °C (Fig. 7) and using the equation of state by Holloway (1977, 1981) inclusions from two samples...65 g/cm 3, respectively, using the equations of state of Zhang and Frantz (1987). Origin of tourmaline |  | | Journal (article/letter/editorial) | | late-stage minerals, typically TiO2, ilmenite, titanite and calcite. Replacement reactions are believed...“incompatible” elements. In some cases (Benfontein in South Africa), differentiation processes may have contributed...minéraux tardifs, par exemple TiO2, ilménite, titanite et calcite. Les réactions de remplacement auraient...hypabyssal-facies kimberlites such as the Benfontein sill in South Africa (Dawson & Hawthorne 1973). Numerous publications...upper-mantle rocks, in association with niobian titanite, magnesian ilmenite, spinel and Nb–Cr-enriched |
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