 | | Journal (article/letter/editorial) | | Mineral inclusions in diamonds from the River Ranch kimberlite, Zimbabwe Received: 11 January 1995 / Accepted:...diamonds from the River Ranch pipe in the Late Archean Limpopo Mobile Belt (Zimbabwe), are phases of harzburgitic...chemistry demonstrates a limited overlap with River Ranch kimberlite macrocrysts: the DI garnets are more...DI spinel and garnet are more Mg-rich. Most River Ranch diamond inclusions were equilibrated at T = 1080±...inclusions from all other kimberlites studied, the River Ranch DI have a lithospheric aÂnity and therefore indicate |  | | Journal (article/letter/editorial) | | Southdale, 2135, South Africa c De Beers Group Services, PO Box 47, Kimberley, South Africa d De Beers...Following the discovery of diamonds in river deposits in central South Africa in the mid nineteenth century...discovered in South Africa and Botswana in particular, but also in Lesotho, Swaziland and Zimbabwe. A century...small and marginal, such as the Frank Smith Mine in South Africa. They include large diatremes such as...with the discovery of the older diamond mines in South Africa such as KofïŹefontein, Jagersfontein and the |  | | Journal (article/letter/editorial) | | the LIMA (lindsleyite-mathiasite) series and perovskite are rare accessories in Utype diamonds. Ilmenite...presence of complex titanates of the LIMA series and perovskite in diamond-bearing assemblages reflects the metasomatizing...Tibearing oxides (titanates of the LIMA series, perovskite) from the ultrahigh-pressure mineral assemblages...titanate (Sobolev et al., 1997) and especially perovskite are among the rarest diamond inclusions. Rutiles...Picroilmenite (geikielite), and Diamonds and Perovskite Included in Diamond 1 Mr-20 Sample: Rutile n: |  | | Journal (article/letter/editorial) | | Mg2SiO4-spinel breaks down to periclase + MgSiO3-perovskite at pressures greater than about 27 GPa at 1...(1989). Thus, ferropericlase and (Mg,Fe)SiO3-perovskite can only possibly coexist in the P, T conditions...should be composed of >70 wt% of (Mg,Fe)SiO3-perovskite and 20 wt% of ferropericlase (Liu 1979; Irifune...(Mg,Fe)SiO3-perovskite (Liu 1982). Thus, there is little doubt that (Mg,Fe)SiO3-perovskite is the most...inclusion might represent former (Mg,Fe)SiO3-perovskite and might have coexisted with the ferropericlase |  | 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) | | major-element composition of olivine, and SiO2. CaSi-perovskite inclusions coexist with titanite (sphene), ``olivine''...``olivine'' and native Ni. MgSi-perovskite coexists with TAPP (tetragonal almandine-pyrope phase). Majoritic...ferropericlase (fPer), MgSi-perovskite (MgSiPvk), CaSi-perovskite (CaSiPvk), CaTi-perovskite (CaTiPvk), sphene...retrograde phase transformations, no longer have the perovskite structure, as suggested by Joswig et al. (1999)...3 3 1 1 2 Ilmenite Picroilmenite Spinel CaSi-perovskite ``Olivine'' SiO2 Associations Fe-periclase+ilmenite |  | | Journal (article/letter/editorial) | | ALTERATION PATTERNS AND COMPOSITIONAL VARIATION OF PEROVSKITE IN KIMBERLITES ANTON R. CHAKHMOURADIAN§ AND ROGER...present work summarizes a detailed investigation of perovskite from a representative collection of kimberlites...worldwide. The most common modes of occurrence of perovskite in archetypal kimberlites are discrete crystals...(typically ferroan geikielite or magnesian ilmenite). Perovskite precipitates later than macrocrystal spinel (aluminous...ulvöspinel â magnetite series. In most cases, perovskite crystallization ceases prior to the resorption |  | | Journal (article/letter/editorial) | | Research Institute, Nelson Mandela University, South Africa Deutsches GeoForschungsZentrum GFZ, Telegrafenberg...University, South Africa e-mail: Maarten.DeWit@mandela.ac.za © 2017 September Geological Society of South Africa...kimberlites: macro-sized diamonds from River Ranch kimberlite in Zimbabwe and the Swartruggens and Klipspringer...Klipspringer kimberlitic deposits from South Africa, and micro-sized diamonds from the Klipspringer and Premier...Premier kimberlite intrusions in South Africa. Type IaAB diamonds are found in all the samples; Type IaB |  | 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) | | Sr)(Nb,Cr)O3: A new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa Nicole...8QQ, U.K. 2 Abstract Goldschmidtite is a new perovskite-group mineral (IMA No. 2018-034) with the ideal...inclusion in a diamond from the Koffiefontein pipe in South Africa. In addition to the dark green and opaque...Moritz Goldschmidt (1888â1947), who formalized perovskite crystal chemistry and identified KNbO3 as a ...perovskitestructured compound. Keywords: Perovskite, niobium, mantle, diamond inclusion, new mineral |  | | Journal (article/letter/editorial) | | titanium minerals from kimberlite (ilmenite FeTiO3, perovskite CaTiO3, and rutile TiO2) were studied experimentally...experimentally at 7â8 GPa and 1600â1650°C. Perovskite reacts with the formation of rutile in the diamond-forming...mostly represented by ilmenite (Fe,Mg)TiO3 and perovskite CaTiO3; rutile TiO2 is less abundant (Mitchell...has been recorded in reaction rims on ilmenite, perovskite and chrome spinellide. Tabular and acicular (up...in kimberlitic melts (Garanin et al., 2009). Perovskite CaTiO3 is the rare mineral of inclusions in diamonds |  | | Journal (article/letter/editorial) | | Earth mantle. The study of diamonds from the Mwadui Mine has the scope to provide data on the state of the...Africa (Dawson 1992). The Mwadui Mine (formerly known as Williamson Mine) in Western Tanzania is the largest...1977; Raber 1978; Shee 1980 unpublished). The Mwadui Mine preserves crater facies, including lake beds, a...low CaO region found for example, at the Finsch Mine diamonds (Harris and Gurney 1979). In general major...Letseng-la-terrai (McDade and Harris 1996), and River Ranch (Kopylova et al. 1997). From Mwadui a single |  | | Journal (article/letter/editorial) | | Sciences, University of Cape Town, Rondebosch 7701, South Africa De Beers Exploration Division, GeoScience...GeoScience Centre, PO Box 82232, Southdale 2135, South Africa Corresponding author: e-mail: hielke.jelsma@debeersgroup...Sciences, University of Cape Town, Rondebosch 7701, South Africa e-mail: maarten@cigces.uct.ac.za Christien...Sciences, University of Cape Town, Rondebosch 7701, South Africa e-mail: christie@cigces.uct.ac.za Paul H...Sciences, University of the Witwatersrand, Wits 2050, South Africa e-mail: dirksp@geosciences.wits.ac.za Giulio |  | | Journal (article/letter/editorial) | | Accepted Manuscript Perovskite classification: An Excel spreadsheet to determine and depict end-member...end-member proportions for the perovskite- and vapnikite-subgroups of the perovskite supergroup Andrew J. Locock...this article as: Locock, A.J., Mitchell, R.H., Perovskite classification: An Excel spreadsheet to determine...end-member proportions for the perovskite- and vapnikite-subgroups of the perovskite supergroup, Computers and...the journal pertain. ACCEPTED MANUSCRIPT 1 Perovskite classification: An Excel spreadsheet to determine |  | | Journal (article/letter/editorial) | | BRODERICK .\W^ D. PI.OWES 65 Landscape evolution in Zimbabwe from the Permian to present, with implications...(Pvt.) Limited, Box CH399. Chisipite. Harare. Zimbabwe. e-mail: andy.m()ore@info.b\v F.P.D. (Woody)...Sciences, Liniversity of Cape Town, Rondebosch 7701, South Africa. e-mail: ienton.cotterill@uct.ac.za T. Broderick...Broderick 19 Jenkinson Road, Chisipite, Harare. Zimbabwe e-mail: makari@zol.co.zw D. Plowes 49 Arcadia...Society of South Africa ABSTRACT Evidence is presented to model drainage evolution -Acmss Zimbabwe since |  | | Journal (article/letter/editorial) | | ferropericlase, CaSi-perovskite, magnetite, MgSi-perovskite, pyrrhotite, âolivineâ, SiO2, perovskite, tetragonal...craton (Tassinari and Macambira 1999) (inset of South America). b Detailed map of Juina area with Rio...provides strong evidence in support of an initial perovskite structure. Analysed (Mg,Fe)SiO3 contains no Ni...(Fig. 5). Among CaSiO3 polymorphs, only CaSi-perovskite (CaSi-Prv) is stable with mantle minerals and...(Mg,Fe)SiO3, pyrrhotite, (Mg,Fe)2SiO4, SiO2, perovskite, tetragonal almandine-pyrope phase (TAPP), garnet |  | | Journal (article/letter/editorial) | | Territories, Colorado/Wyoming). Ten new U â Pb perovskite/mantle zircon and Rb â Sr phlogopite age determinations...Jurassic and Permian kimberlite fields. New U â Pb perovskite results for the 614.5 F 2.1 Ma Chicken Park and...throughout the Phanerozoic from the Cambrian (Venetia, South Africa; Snap Lake and Kennady Lake, Canada) to the...encapsulated in a finer-grained matrix of calcite, perovskite, phlogopite, and spinel ( F apatite, monticellite...dating, such as phlogopite (Rbâ Sr, 40Ar/39Ar), perovskite (U â Pb), mantle zircon (U âPb), or mantle rutile |  | | Book | | associated alkalic basaltic rocks from Pishin District, Pakistan.4 Reasons of variations of individual...prognosis and prospering of diamond's host rocks on the south of Siberian platform.38 The petrology and geochemistry...of a polymict xenolith from the Kimberley Area, South Africa......40 Eclogites from the Mir kimberlite...megacrysts from the Lace (Group II) kimberlite, South Africa..........52 Isotope composition of the sub-continental...Southeastern Raipur kimberlitic field, Raipur District, Madhya Pradesh, Central India.106 Experimental |  | Bulanova, G.P., Muchemwa, E., Pearson, D.G., Griffin, B.J., Kelley, S.P., Klemme, S., Smith, C.B. (2004) Syngenetic inclusions of yimengite in diamond from Sese kimberlite (Zimbabwe) â evidence for metasomatic conditions of growth. Lithos, 77 (1) 181-192 doi:10.1016/j.lithos.2004.04.002 | Journal (article/letter/editorial) | | of yimengite in diamond from Sese kimberlite (Zimbabwe) â evidence for metasomatic conditions of growth...b Rio Tinto Zimbabwe Ltd., Kenilworth Garden, 1 Kenilworth Rd., Newlands, Harare, Zimbabwe c Department...macrodiamond from the Sese kimberlite (50 km south of Masvingo, Zimbabwe). One yimengite inclusion carries lamellae...40 Ar/39Ar; Kimberlite; Mantle; Metasomatism; Zimbabwe 1. Introduction Yimengite, a very rare Large...chromian diopside, apatite, zircon, moissanite and perovskite (Dong et al., 1983). Subsequently, yimengite |  | Sobolev, N.V., Logvinova, A.M., Zedgenizov, D.A., Seryotkin, Y.V., Yefimova, E.S., Floss, C., Taylor, L.A. (2004) Mineral inclusions in microdiamonds and macrodiamonds from kimberlites of Yakutia: a comparative study. Lithos, 77 (1) 225-242 doi:10.1016/j.lithos.2004.04.001 | Journal (article/letter/editorial) | | Krasnopresnenskaya mines; Daldyn (4), Udachnaya mine. All other fields include mostly barren and low...Microdiamonds with mineral inclusions from Komsomolskaya mine. Symbols for mineral inclusions: pyrope (Prp), olivine...polymineralic inclusions in microdiamonds from Udachnaya mine exposed at the polished surface of microdiamond...demonstrated by U â Pb zircon (Davis et al., 1980) and perovskite ages (Kinny et al., 1997), all listed pipes are...chromite inclusions from Yakutian (fields 1 and 2) and South African (field 3) macrodiamonds (Griffin et al. |  | Thomson, A.R., Kohn, S.C., Bulanova, G.P., Smith, C.B., Araujo, D., Walter, M.J. (2016) Trace element composition of silicate inclusions in sub-lithospheric diamonds from the Juina-5 kimberlite: Evidence for diamond growth from slab melts. Lithos, 265. 108-124 doi:10.1016/j.lithos.2016.08.035 | Journal (article/letter/editorial) | | inclusions interpreted as former calcium silicate perovskite and majoritic garnet preclude their origin as... Observed enrichments in garnet and âcalcium perovskiteâ inclusions limit depths of melting to less than...than ~ 600 km, prior to calcium perovskite saturation in subducting assemblages. Less enriched inclusions...producing melts in equilibrium with Juina-5 âcalcium perovskiteâ and majorite inclusions are consistent with...calcium silicate inclusions (interpreted as former perovskite) as an indication they crystallised from a âlow-degree |  | | Journal (issue) | | and Burke, E.AJ., 1998. Emeralds from Sandawana, Zimbabwe: the use of Raman microspectroscopy in identification...other countries (e.g. Brazil, Russia, Zambia, Zimbabwe-Sandawana, Afghanistan and India) crystalline...Eleven single crystals from Heffernan's mine, Torrington, New South Wales, Australia, five from Arac,uai...Locality Sample numbers Australia: Heffernan's mine, Torrington, NSW Size Colour Morphology 1-11...a representative beryl crystal from Heffernan's mine, and Figures 2a, b and c are DICM photographs at |  | | Book | | responsibility for authorsâ errors and omissions. SOUTH AFRICA SEVENTH INTERNATIONAL KIMBERLITE CONFERENCE...Survey of South Africa) SouthemEra Resources Ltd SOCIETY SPONSORS Geological Society of South Africa (GSSA)...a Phanerozoic subduction regime in eastern New South Wales, Australia. Mantle Dynamics beneath Mongolia:...diamond. 61 Cr-poor Megacrysts from the Frank Smith Mine and the source regions of transitional kimberlites...Lithospheric Mantle anisotropy of the Kaapvaal craton (South Africa) from lattice preferred orientation analysis |  | | Journal (article/letter/editorial) | | Grahamstown, 6140, South Africa. e-mail: andy.moore@info.bw © 2009 March Geological Society of South Africa ABSTRACT...the 3106 Cullinan, recovered from the Premier Mine, South Africa (Williams, 1932), as well as gems like...kindly provided by Debbie Bowen of Letseng Diamond Mine, illustrates a selection of Type IIa stones from...the Letseng Type IIa stones do not fluoresce. SOUTH AFRICAN JOURNAL OF GEOLOGY, 2009, VOLUME 112 PAGE...IIa diamonds from Letseng Mine, curtesey of Debbie Bowen of Letseng Diamond Mine. Large stone is the 603 |  | | Journal (issue) | | discovered in 1995 in the Booyo area, about 250 km south-west of Seoul, Korea (Figure 1), and is being mined...SCHIST Âź Booyo Nokok M.inc (*sry) Booyo Nokok Mine serpentine A study of of Korean Koreanprecious...Non-precious extracted from the mine. the Booyo BooyoNokok Nokok mine. from (Chogyeri Formation) and sandstone...3 and 20 cm. At present 2 adits are open at the mine. They are at 10 metres vertical interval and are...1.710 5 5 hh Ă 77 9 9 12 12 from Booyo Nokok mine 1. Precious serpentine from 2. Antigorite, JCPDS |  | | Journal (issue) | | Polynesia, golden and white cultured pearls from the South Seas, and myriad shapes and colors from China. And...marketed, and merchandized. In diamonds especially, the mine-to-market process has been severely tested. Vertical...Africa (Tanzania, Kenya, Zimbabwe, Nigeria, and Namibia, as well as Madagascar), South America (Brazil and...Australia, central and southern Africa (Botswana, South Africa, Namibia, Angola, and Zaire), and Russia...gem-producing regions (southern Africa, South Asia, Southeast Asia, Australia, South America). Although there has |  | | Book | | ^ 'â P r . . . I West Orange SOUTH SAN FRANCISCO PUBLIC LIBRARY 9048 00992838 7 257989 R q549...composition between acidic and basic rocks. drift mine Adit(s) driven into gravel. Characterized by the...Potholes first District of Imperial Yuma, Diego County, County, near the Colorado River about 10 miles...Then in on the western 1835; and in the Piru District, Ventura County, in the early 1840s. 1848 the...side of the Sierra From 1848 in the American River, at Sutterâs Mill Nevada, changed the history |
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