| BATUMIKE, J, GRIFFIN, W, BELOUSOVA, E, PEARSON, N, OREILLY, S, SHEE, S (2008) LAM-ICPMS UāPb dating of kimberlitic perovskite: EoceneāOligocene kimberlites from the Kundelungu Plateau, D.R. Congo. Earth and Planetary Science Letters, 267 (3) 609-619 doi:10.1016/j.epsl.2007.12.013 | Journal (article/letter/editorial) | com/locate/epsl LAM-ICPMS UāPb dating of kimberlitic perovskite: EoceneāOligocene kimberlites from the Kundelungu...out in situ LAM-ICPMS UāPb dating of groundmass perovskite in two kimberlitic pipes (Kambeli and Msipashi)...analysis of perovskites from four previously dated South African Group I kimberlites. Intercepts of regression... The ages of Group I kimberlites in Kimberley District cluster around 87 Ma, similar to those determined...reserved. Keywords: UāPb geochronology; LAM-ICPMS; perovskite; Kundelungu kimberlites; East African Rift; Kaapvaal | | | Journal (article/letter/editorial) | Accepted Manuscript New constraints on archetypal South African kimberlite petrogenesis from quenched glass-rich...Steffen H. BĆ¼ttner , New constraints on archetypal South African kimberlite petrogenesis from quenched glass-rich... ACCEPTED MANUSCRIPT New constraints on archetypal South African kimberlite petrogenesis from quenched glass-rich...Rondebosch 7701, South SC 1 RI Geoffrey H. Howarth1,2,* and Steffen H. BĆ¼ttner3 Africa Department of...Geology, Rhodes University, Grahamstown 6040, South Africa NU 2 AC CE PT E D MA *Corresponding | | Kamenetsky, Vadim S., Belousova, Elena A., Giuliani, Andrea, Kamenetsky, Maya B., Goemann, Karsten, Griffin, William L. (2014) Chemical abrasion of zircon and ilmenite megacrysts in the Monastery kimberlite: Implications for the composition of kimberlite melts. Chemical Geology, 383. 76-85 doi:10.1016/j.chemgeo.2014.06.008 | Journal (article/letter/editorial) | abrasion of zircon and ilmenite megacrysts in the Monastery kimberlite: Implications for the composition of...ilmenite and zircon megacrysts from the Monastery kimberlite (South Africa) represent a textbook example of...sodiumāzirconium silicates) and Ti (TiāFe oxides, perovskite, sphene, kassite), are present around zircon...exploration. The āclassicā megacryst suite in the Monastery kimberlite, renowned for the size of its crystals...more abundant in the Group I Monastery kimberlite pipe in South Africa than in any other studied kimberlite | | | 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. . | | | 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 | ............................ 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... . . . . . . . . . . . . . . . . . . . . . . Perovskite . . . . . . . . . . . . . . . . . . . . . . .... . . . . . . . . . . . . 6.17.2. Mantles on Perovskite ......................................... 6.17...7.2. 2. Compositional Variation of Contamination-Free Kimberlites .......... 7.2 .2 .I. Intra-kimberlite | | | Journal (article/letter/editorial) | are larger, have reaction rims of leucoxene and perovskite, exhibit strong magnesium enrichment outward...(6) inclusions in and intergrowths with matrix perovskite and titanomagnetite (Plates 1, 2); and (7) highly...isolated grains (type 1) and small inclusions in perovskite (type 6). There are some ilmenite occurrences...their often thick (100+gm) reaction mantles of perovskite (blocky or massive), titanomagnetite (commonly...Inclusion-mantle textures of ilmenite in groundmass perovskite and/or titanomagnetite (/]6, Plates 1 a, c-e) | | | Book | calcite, clay minerals and fragments of crustal and local host country-rock. At Lattavaram the kimberlite...and ilmenite. Minor phases such as sphene and perovskite have also been observed. Chemical analyses of...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 | | | Journal (article/letter/editorial) | et al. [44];ettheir 2. Polymineralic diamondmine, mine, Slave craton, Canada (modified after Bussweiler...Gurney et al., 1979 [32] Monastery kimberlite, Kaapvaal craton, South Africa ol Ti-rich phl, ol, spl...and BĆ¼ttner, 2019 [45] Monastery kimberlite, Kaapvaal craton, South Africa ol cc, phl, spl (low Al...ilmenite, mgt = magnetite, ol = olivine; prv = perovskite, phl = phlogopite, spl = spinel, srp = serpentine...within olivine megacrysts from the Monastery kimberlite, South Africa, favored an āentrapped liquid hypothesisā | | | Journal (article/letter/editorial) | groundmassilmenite, spinel solid solutions, and perovskite. The discrete ilmenite noduleshavemarginsthat...light REE relative to heavy REE. The enrichmentof perovskite in REE may be related to partitioning of the...a groundmlss ssnfaining calcite, serpentine, perovskite, and phlogopite. Nixon and Boyd (1973)describedtwo...Colby (1971) was used for data reduction of the perovskite analyses. The program corrects for interferencesbetween...feasible technique for determination of REE in perovskite from kimberlite becauseof the difficulty of separatingpqre | | Lim, Emilie, Giuliani, Andrea, Phillips, David, Goemann, Karsten (2018) Origin of complex zoning in olivine from diverse, diamondiferous kimberlites and tectonic settings: Ekati (Canada), Alto Paranaiba (Brazil) and Kaalvallei (South Africa) Mineralogy and Petrology, 112. 539-554 doi:10.1007/s00710-018-0607-6 | Journal (article/letter/editorial) | (Canada), Alto Paranaiba (Brazil) and Kaalvallei (South Africa) Emilie Lim 1 & Andrea Giuliani 1,2 & David... Tres Ranchos-04), and the Kaapvaal craton, South Africa (Kaalvallei: Samada, New Robinson). Olivine...Samada and New Robinson (Kaalvallei cluster), South Africa (Fig. 1). This is the first detailed study of...cluster, which intruded into the Kaapvaal craton, South Africa. The Samada sample (173/44/ K8/7) is from the...Ocean Limpeza, Tres Ranchos South Africa (47Ā°W, 19Ā°S ) Samada, New Robinson South (27Ā°E, 28Ā°S) Atlantic Ocean | | | 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...whereas inclusions of ferropericlase and MgSiO3 perovskite are of a lower mantle origin. This led Hutchison...Majoritic garnets were found in association with CaSi-perovskite, SiO2 and Al2SiO5, Na-clinopyroxene, and a phase | | | Journal (article/letter/editorial) | to fully constrain the compositional and thermal state of the transition zone and the lower mantle. Important...composition and the crystallographic and thermal state of the deeper parts of the Earthās mantle. Diamond...majoritic garnet inclusions in diamonds from the Monastery mine. The possibility of some diamonds even being...tetragonal almandine pyrope phase at the Brazilian mine Sao Luiz (Harte & Harris, 1994; Harte et al., 1999)...550-600 km, majorite garnet starts to exsolve CaSi-perovskite (Irifune & Ringwood, 1987; Wood, 2000) which | | Collerson, Kenneth D., Williams, Quentin, Kamber, Balz S., Omori, Soichi, Arai, Hiroyoshi, Ohtani, Eiji (2010) Majoritic garnet: A new approach to pressure estimation of shock events in meteorites and the encapsulation of sub-lithospheric inclusions in diamond. Geochimica et Cosmochimica Acta, 74 (20) 5939-5957 doi:10.1016/j.gca.2010.07.005 | Journal (article/letter/editorial) | inclusions. Majoritic garnets associated with Mg perovskite in shocked L chondrites (n = 4) yield uniform...Jagersfontein (22.3 Ā± 0.8 GPa and 16.9 Ā± 1 GPa), Monastery (15.7 Ā± 7 GPa) and Kankan (15.5 Ā± 0.2 GPa) show...parageneses except those that include Ca silicate perovskite. The derived pressures conļ¬rm the sub-lithospheric...samples was as inclusions in diamond from the Monastery Mine kimberlite pipe by Moore and Gurney (1985,...post-garnet phase transformations into Ca- and Mg-perovskite and ilmenite, and the 5942 K.D. Collerson | | | Journal (article/letter/editorial) | SCIENCES, DURHAM UNIVERSITY, SOUTH ROAD, DURHAM DH1 3LE, UK 2 ARIZONA STATE UNIVERSITY, CHEMISTRY AND BIOLOGY...CENTRE, PO BOX 82232, SOUTHDALE GAUTENG 2135, SOUTH AFRICA 5 NERC ISOTOPE GEOSCIENCES LABORATORY, KINGSLEY...PUBLICATION JULY 1, 2004 Kimberlites from Southern Africa, along with their low-Cr megacrysts, have unusual...systematics of ultra-deep phases such as majorite and perovskite (Fig. 1) compared with shallower phases could..., 1995). The samples studied are from Southern Africa, belonging to the isotopic Groups I and II of Smith | | | Journal (article/letter/editorial) | lithosphere. Keywords: diamond inclusion, majorite, perovskite, phase transition, Important observations over...al. (1984) on kimberlite dikes near Orrorroo in South Australia. These authors noted that if ferropericlase...from this occurrence and the Koffiefontein Mine in South Africa were indeed syngenetic, then, because of...glossary p. 70) in diamonds from the Monastery mine, South Africa (Moore and Gurney 1985), which indicated...GPa ZONE 600 RINGWOODITE PHASE TRANSITION 700 PEROVSKITE + FERROPERICLASE 24 100 Opx Lithosphere | | | Journal (article/letter/editorial) | Layered Kimberlite-Carbonate Sill from Benfontein, South Africa Nabil Z. Boctor and F.R. Boyd Geophysical Laboratory...USA Abstract. The lower sill at Benfontein, South Africa, shows a high degree of magmatic sedimentation...titanomagnetite, magnesian ilmenite, rutile, and perovskite. The spinel crystallization trend was toward...enrichment observed in ilmenites from carbonatites. Perovskite in silicate-rich and carbonate-rich layers shows...lacks the remarkable Nb enrichment observed in perovskite from earbonatites. These new data oh the iron-titanium | | Stachel, Thomas, Aulbach, Sonja, Brey, Gerhard P., Harris, Jeff W., Leost, Ingrid, Tappert, Ralf, Viljoen, K.S.(Fanus) (2004) The trace element composition of silicate inclusions in diamonds: a review. Lithos, 77 (1) 1-19 doi:10.1016/j.lithos.2004.03.027 | Journal (article/letter/editorial) | GeoScience Centre, P.O. Box 82232, Southdale 2135, South Africa Received 27 June 2003; accepted 17 February...Lower mantle sources, assessed based on CaSi ā perovskite as the principal host for REE, are not primitive...asthenosphere and transition zone were obtained for Monastery (Moore et al., 1991), Juina-SaĢo Luiz (Wilding...garnet and clinopyroxene inclusions from Venetia (South Africa) Sample V-64a V-87b V-95 V-112a V-149 Mineral...al., 1994), thereby explaining the absence of a free SiO2 phase. Based on REE analyses of garnet and | | 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...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...(d13C=Ā±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 | | | Journal (article/letter/editorial) | 1984; Moore et al. 1986; Rickard et al. 1989), Monastery (Moore and Gurney 1989), Sloan (Otter and Gurney...Mg2SiO4spinel breaks down to periclase + MgSiO3-perovskite at pressures greater than about 270 kbar at 1000...Harris (1994) discovered CaSiO3 (assumed to have a perovskite-type structure) and a new garnet-like inclusion...because the dehydrated phase assemblage contains free H2O, which is very compressible so that the volume...in these diamonds originally existed as MgSiO3-perovskite in the lower mantle, but underwent a retrogressive | | | Journal (article/letter/editorial) | Kimberlite-hosted diamond deposits of southern Africa: A review Matthew Field a,ā, 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 | | | Book (volume) | ANDWILLIAMSON MINE, TANZANIA H.-M. Tsai, O. A. Meyer, 0. Moreau, and H. Judith Milledge REGIONAL AND LOCAL VARIATIONS...KIFYBERLiTES IN THE COLORADO-WYCā¢ING STATE mINE DISTRICT 42 M. E. McCal!um, C. D. Mabarak, and H... K. J. Stracke, 59 OF KIMBEHLITES H.-M. IN SOUTH-EASteRN AUSTRALIA 71 J. Ferguson, anā¢ L. P. Black...CARBONATITEERUPTIVES AT SALTPETRE 111 KOP, SUā¢}tERLAND, SOU'iH AFRICA J. R. ā¢cIver and J. Ferguson Mā¢NERALOGY AND PETROLOGY...MINERAL CHEMISTRY OF A KIMBERLITE FROM THE PRā¢Iā¢IER MINE: Iā¢iPLICATIONS FOR THE EVOLUTION OF KiFmEHLITIC | | Kostrovitsky, S.I., Yakovlev, D.A., Soltys, A., Ivanov, A.S., Matsyuk, S.S., Robles-Cruz, S.E. (2020) A genetic relationship between magnesian ilmenite and kimberlites of the Yakutian diamond fields. Ore Geology Reviews, 120. 103419 doi:10.1016/j.oregeorev.2020.103419 | Journal (article/letter/editorial) | Academy of Sciences, Irkutsk, Russia c Irkutsk State University, Geology Department, Irkutsk, Russia...ādiļ¬useā distribution types with one distinctive local area on MgOCr2O3 plot (Figure Supplementary Fig...titaniferousmagnetite which are occasionally zoned to Ti-free magnetite occur in the interstitial space between..., 1997), Jagersfontein (South Africa ā Jonston, 1973), Premier (South Africa ā Danchin, 1979), Letlhakane...signiļ¬cantly lower modal abundance of ilmenite and perovskite. An important feature of ilmenite compositional | | Smith, C.B., Allsopp, H.L., Garvie, O.G., Kramers, J.D., Jackson, P.F.S., Clement, C.R. (1989) Note on the UīøPb 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. SMITHā, āBernard H...American Research Laboratories, Crown Mines 2025 (South Africa) 3Department of Geology, University of Zimbabwe...0001 (South Africa) āAnglo 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) | 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 |
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