 | | Journal (article/letter/editorial) | | 68, pages 494-505, 1983 Lindsleyite (Ba) and mathiasite (K): two new chromium-titanates in the crichtonite...Department of Geochemistry University of Cape Town, Republic of South Africa arro R. V. DnNcurrq2 Anglo-American...ResearchLaboratory Crown Mines, Johannesburg, Republic of South Africa Abstract Two new opaquemineralsare describedfrom...1.037nm, c = 2.052nm, V : l.9ll nm3, and for mathiasite are a = 1.035nm, c : 2.058 nm, V = 1.909nm3....anisotropy. Spectral reflectancesfor lindsleyite and mathiasite are very similar and are comparable to ilmenite |  | | Report (issue) | | [1378–1714, 1505 average (100 g load)] (“comparable to mathiasite”). D(meas.) = n.d. D(calc.) = 4.63 Optical Properties:...10.37 c = 20.52 Z=3 X-ray Powder Pattern: South Africa. 2.13 (100), 1.80 (100), 1.59 (100), 1.44 (100)...07 0.29 17.19 Total 99.78 99.08 (1) De Beers mine, South Africa; by electron microprobe, all Fe as FeO...veinlets in metasomatized kimberlite (South Africa). Association: Mathiasite, phlogopite, perovskite, chromian...spinel (South Africa). Distribution: From the De Beers and Bultfontein diamond mines, Kimberley, Cape Province |  | | 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 |  | | Journal (article/letter/editorial) | | [Northeastern University] at 11:35 25 October 2014 D Two South Africans Hans Merensky and Cecil John Rhodes P...first new mineral species to be described from South Africa. It was named after Col. Hendrik von Prehn (1733-85)...(1733-85), a Dutch colonial living in Cape Town who collected the first specimens and brought them to...Europe in 1774. Seventy years elapsed before South Africa produced another species-teschemacherite, described...Further new mineral descriptions had to wait until South Africa’s modern mining industry was established |  | 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) | | metasomatism to Karoo magmatism beneath the Kimberley region, South Africa Andrea Giuliani a,∗ , David Phillips...titanate U–Pb geochronology mantle metasomatism Kimberley Karoo magmatism a b s t r a c t The Karoo igneous...igneous rocks (174–185 Ma) of southern Africa represent one of the largest continental flood basalt provinces...kimberlites in southern Africa. Here we report U–Pb ages for lindsleyite–mathiasite (LIMA) titanate minerals...from the ∼84 Ma Bultfontein kimberlite (Kimberley, South Africa), located in the southern part of the Karoo |  | | Journal (article/letter/editorial) | | sequence and magma evolution of the De Beers dyke (Kimberley, South Africa) Ashton Soltys 1 & Andrea Giuliani...the De Beers dyke, a contemporaneous, composite intrusion bordering the De Beers pipe (Kimberley, South...South Africa). Petrographic features and mineral compositions indicate the following stages in the evolution...mineral compositions of different units within the De Beers dyke are indistinguishable from one another, indicating...root zone intrusions of the main Kimberley pipes (i.e., Wesselton, De Beers, Bultfontein). However, the composition |  | Fitzpayne, Angus, Giuliani, Andrea, Harris, Chris, Thomassot, Emilie, Cheng, Chen, Hergt, Janet (2019) Evidence for subduction-related signatures in the southern African lithosphere from the N-O isotopic composition of metasomatic mantle minerals. Geochimica et Cosmochimica Acta, 266. 237-257 doi:10.1016/j.gca.2019.02.037 | Journal (article/letter/editorial) | | 2109 New South Wales, Australia 3 Department of Geological Sciences, University of Cape Town, Rondebosch...7700, South Africa 4 Centre de Recherches Pétrographiques et Géochimiques-CNRS, Université de Lorraine...Vandœuvre-lès-Nancy Cedex, France 5 Institut de Physique du Globe de Paris (IPGP), 1 Rue Jussieu, 75238 Paris...rocks – from the Bultfontein kimberlite (Kimberley, South Africa), which show varying degrees of metasomatism...crustal component occurred in the source of the Kimberley kimberlites, or was assimilated during interaction |  | | 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...extreme * Present address: Institut de Physique du Globe, Universit6 de Paris VI, 4, place Jussieu, 75230...Cretaceous age, Bultfontein (Kimberley district) and Thaba Putsoa (northern Lesotho), was undertaken with |  | | Journal (article/letter/editorial) | | Phlogopite Zoning Magma ascent Mantle xenoliths Kimberley a b s t r a c t Kimberlite magmas are of economic...phlogopite from the Bultfontein kimberlite (Kimberley, South Africa; i.e. the kimberlite type-locality) and...grains in the Bultfontein kimberlite (Kimberley, South Africa (Fig. 1); i.e. the kimberlite type-locality)...crystals in mantle xenoliths entrained by the Kimberley kimberlites. Phlogopite grains in the Bultfontein...(Giuliani et al., 2014a). 1.1. Phlogopite in the Kimberley kimberlites and entrained mantle xenoliths Limited |  | | 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)...Unusually Fe- and Ni-rich macrocrysts unique to the Lace mine are from Fe-rich orthopyroxene-bearing peridotites...kimberlite, chromian spinel, magnesiochromite, southern Africa. SOMMAIRE Je présente ici une comparaison, en |  | | Journal (article/letter/editorial) | | microinclusion-bearing diamonds from the Group I De Beers Pool kimberlites, South Africa, using FTIR, EPMA and LA-ICP-MS...because, elevated thermal conditions prevailed in the South African lithosphere during and following the Karoo...touching inclusion pairs in diamonds from the De Beers Pool kimberlites, which represent the mantle ambient...southwestern part of the Kaapvaal Craton in South Africa has been studied intensively. Mantle derived...subducting slabs during and after amalgamation of the Kimberley and Witwatersrand blocks, at ca. 2.9 Ga (e.g. |  | | Journal (article/letter/editorial) | | xenoliths from the Bultfontein kimberlites, South Africa: implication for low bulk-rock oxygen isotopic...xenoliths from the Bultfontein kimberlites, South Africa, contain abundant ilmenites (30% in BD2666,...of Geochemistry, University of Cape Town, Rondebosch 7700, South Africa Editorial responsibility: T.L...homogeneous high-Ti silicate melt. Keywords South Africa á Polymict xenolith á Oxide mineral á Ilmenite...armalcolite and exotic oxides, such as lindsleyite-mathiasite (LIMA) and yimengitehawthorneite (YIHA; e.g. |  | Fitzpayne, Angus, Giuliani, Andrea, Hergt, Janet, Woodhead, Jon D., Maas, Roland (2020) Isotopic analyses of clinopyroxenes demonstrate the effects of kimberlite melt metasomatism upon the lithospheric mantle. Lithos, 370. 105595pp. doi:10.1016/j.lithos.2020.105595 | Journal (article/letter/editorial) | | Ilmenite-Clinopyroxene) rocks from the Kimberley kimberlites (South Africa). The studied oo f mantle samples...in the deeper part of the lithosphere beneath Kimberley. In contrast, Type 2 clinopyroxenes occur in MARID...lherzolite in the lithospheric mantle beneath the Kimberley pr area, which was followed by kimberlite metasomatism...subcontinental lithospheric mantle (SCLM) beneath southern Africa has a complex evolutionary history. Extreme melt...and exotic oxide minerals such as lindsleyite-mathiasite (LIMA) group minerals (Erlank et al., 1987; Giuliani |  | | Journal (article/letter/editorial) | | Cretaceous to late Jurassic) kimberlites in the Kimberley area. The metasomatic style is characterized by...emplacement ages of group I kimberlites in the Kimberley area dated at 83 4 (2r) and 84 0.9 Ma. One...both group I and II kimberlite magmatism in the Kimberley area. MARID and PKP zircon ages are also consistent...1975; Smith 1983) and cluster around 85 Ma in the Kimberley area. Konzett et al. (1995, 1998), using SHRIMP...B9297 contains numerous, mostly altered globular sul®de aggregates. Relict cores may show pyrrhotite with |  | Giuliani, Andrea, Fiorentini, Marco L., Martin, Laure A.J., Farquhar, James, Phillips, David, Griffin, William L., LaFlamme, Crystal (2016) Sulfur isotope composition of metasomatised mantle xenoliths from the Bultfontein kimberlite (Kimberley, South Africa): Contribution from subducted sediments and the effect of sulfide alteration on S isotope systematics. Earth and Planetary Science Letters, 445. 114-124 doi:10.1016/j.epsl.2016.04.005 | Journal (article/letter/editorial) | | xenoliths from the Bultfontein kimberlite (Kimberley, South Africa): Contribution from subducted sediments...Sciences, Macquarie University, North Ryde, 2019, New South Wales, Australia b KiDs (Kimberlites and Diamonds)...Keywords: sulfur isotopes sulfides mantle xenoliths Kimberley SIMS * a b s t r a c t Sulfur isotopes are a...metasomatic fluids beneath the diamondiferous Kimberley region (South Africa), we investigated the S isotope systematics...convergent margins (e.g., Chaussidon et al., 1987; de Hoog et al., 2001; Eldridge et al., 1991; Ionov et |  | Giuliani, Andrea, Woodhead, Jon D., Phillips, David, Maas, Roland, Davies, Gareth R., Griffin, William L. (2018) Titanates of the lindsleyite–mathiasite (LIMA) group reveal isotope disequilibrium associated with metasomatism in the mantle beneath Kimberley (South Africa) Earth and Planetary Science Letters, 482. 253-264 doi:10.1016/j.epsl.2017.11.014 | Journal (article/letter/editorial) | | com/locate/epsl Titanates of the lindsleyite–mathiasite (LIMA) group reveal isotope disequilibrium associated...with metasomatism in the mantle beneath Kimberley (South Africa) Andrea Giuliani a,b,c,∗ , Jon D. Woodhead...Australia c Department of Earth Sciences, VU Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands...xenoliths Sr isotope disequilibrium metasomatism Kimberley * a b s t r a c t Radiogenic isotope variations...heterogeneity between coeval Ti-rich LIMA (lindsleyite–mathiasite) minerals at the time of their formation in the |  | Rezvukhin, D. I., Malkovets, V. G., Sharygin, I. S., Kuzmin, D. V., Gibsher, A. A., Litasov, K. D., Pokhilenko, N. P., Sobolev, N. V. (2016) Inclusions of crichtonite group minerals in pyropes from the Internatsionalnaya kimberlite pipe, Yakutia. Doklady Earth Sciences, 466 (2) 206-209 doi:10.1134/s1028334x16020227 | Journal (article/letter/editorial) | | minerals of the LIMA series from kimberlites of South Africa, whereas the average concentrations of Ba and...are related to the LIMA series (lindsleyite– mathiasite, members of the group with Ba and K as predominant...mineral concentrate of kimberlites from South Africa (De Beers, Jagersfontein, Kolonkwanen, Bultfontein...crichtonite group minerals in xenogenic material of South African kimberlites, findings of these minerals...А Lindsleyite LIMA B C Ba Lindsleyite K Mathiasite Fig. 1. Chemical composition of crichtonite |  | Fitzpayne, Angus, Giuliani, Andrea, Maas, Roland, Hergt, Janet, Janney, Philip, Phillips, David (2019) Progressive metasomatism of the mantle by kimberlite melts: Sr–Nd–Hf–Pb isotope compositions of MARID and PIC minerals. Earth and Planetary Science Letters, 509. 15-26 doi:10.1016/j.epsl.2018.12.013 | Journal (article/letter/editorial) | | Sciences, Macquarie University, North Ryde 2109, New South Wales, Australia c Melbourne Isotope Geochemistry...Geological Sciences, University of Cape Town, Rondebosch 7701, South Africa b a r t i c l e i n f o Article...Cretaceous kimberlites (Kimberley) and orangeites (Newlands) from South Africa are used here to examine...have so far been reported exclusively from the Kimberley kimberlites (e.g., Fitzpayne et al., 2018a, 2018b;...compositions of MARID and PIC samples from the Kimberley kimberlites. In their pioneering work, Kramers |  | | 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...pipes of the Kimberley cluster, and two from Newlands, ~ 60 km north-west of Kimberley. Olivine is absent...I D nodule collected by L. Daniels from Newlands mine (a Group II kimberlite), has a 2 cm wide rind of...ultrabasic ( M g O > 18%) olivine lamproites from West Kimberley reported by Jaques et al. (1984), and compositional |  | | Book | | Project of Energy, Mines, and Resources, Canada; and De Beers Consolidated Mines are acknowledged for financial............................... 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.......................... 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) | | titanates from the Jagersfontein kimberlite, South Africa: Implications for metasomatism in the upper...geochemistry, given that leucite-lamproities in West Kimberley, Australia (WADEand PRIDER, 1940; PRIDER, 1960)...kimberlite, 130 km SE of the Kimberley diatrcme complex in the Republic of South Africa. Data on this kimberlite...HAGGERTY (1975) and ERLANKand RICKARD (I977) from De Beers Jagersfontein kimberlite titanates and Bultfontein...Crichtonites from Jagersfontein are classified as mathiasite but these exhibit some degree of solid solution |  | Giuliani, A., Kamenetsky, V.S., Kendrick, M.A., Phillips, D., Wyatt, B.A., Maas, R. (2013) Oxide, sulphide and carbonate minerals in a mantle polymict breccia: Metasomatism by proto-kimberlite magmas, and relationship to the kimberlite megacrystic suite. Chemical Geology, 353. 4-18 doi:10.1016/j.chemgeo.2012.09.025 | Journal (article/letter/editorial) | | breccia (DU-1) from the Bultfontein Dumps (Kimberley, South Africa). Xenolith DU-1 contains heterogeneous...isotope values (initial εHf =2.1–3.0) in the range of South African Group I kimberlites and associated megacrysts...1973; Gurney et al., 1979; Harte and Gurney, 1981; De Bruin, 2005). Radiogenic (Sr–Nd–Hf) isotope systematics...collected from the Bultfontein Dumps (Kimberley, South Africa). Textural relationships, mineral inclusion...collected from the Bultfontein Dumps (Kimberley, South Africa). The Bultfontein Dumps comprise waste |  | | Journal (article/letter/editorial) | | and a Ti-Cr-Fe-Mg-Sr-K phase of the lindsleyite-mathiasite (LIMA) series. The eclogitic inclusion suite...from the central part of the Kaapvaal craton in South Africa, eclogitic diamonds are in the majority in the...mining in South Africa (Williams, 1932). In a detailed study of diamonds from the main South African pipes...that diamonds from closely spaced pipes in the Kimberley area are generally very similar, although some...of omphacite inclusions in diamonds from both South Africa and Siberia. Table 4 Compositions of chromite |  | | Journal (article/letter/editorial) | | Cretaceous kimberlite of the central Kaapvaal Craton, South Africa. Two episodes of interaction between the host...K-richterite + crichtonite-group (lindsleyite–mathiasite) phases + Nb– Cr-rich rutile + srilankite + zircon...emplacement ages of Cretaceous kimberlites in the Kimberley area. The age spread is interpreted as a result...al. / Lithos 182–183 (2013) 165–184 South Africa. In the Kimberley area numerous Cretaceous kimberlites...xenolith sampled by one of the kimberlites of the Kimberley cluster from the central Kaapvaal Craton, for |  | Abersteiner, Adam, Kamenetsky, Vadim S., Goemann, Karsten, Golovin, Alexander V., Sharygin, Igor S., Giuliani, Andrea, Rodemann, Thomas, Spetsius, Zdislav V., Kamenetsky, Maya (2019) Djerfisherite in kimberlites and their xenoliths: implications for kimberlite melt evolution. Contributions to Mineralogy and Petrology, 174 (1) doi:10.1007/s00410-018-1540-8 | Journal (article/letter/editorial) | | obtained from the mine dumps of the Bultfontein (Group I, or archetypal) kimberlite (South Africa) and comprise...harzburgite, lindsleyite [(Ba,Sr)(Ti,Cr,Fe,Mg)21O38]-–mathiasite [(K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38] (LIMA)-bearing...Roberts Victor orangeite (or Group II kimberlite; South Africa). 3. Nine kimberlite rock samples from the Udachnaya-East...Bultfontein kimberlite (Group I), Kaapvaal Craton (South Africa) ~ 84 Ma (Allsopp and Barrett 1975) Petrography...lindsleyite [(Ba,Sr) XM1/362 (Ti,Cr,Fe,Mg)21O38]–mathiasite [(K,Ca,Sr) (Ti,Cr,Fe,Mg)21O38] (LIMA) bearing |
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