 | | Journal (article/letter/editorial) | | chemistry of new titanates from the Jagersfontein kimberlite, South Africa: Implications for metasomatism...Cr-ferropseudobrookite, and armalcolite is equivalent to Cr-geikielite + rutile in the system (FeMg)-Ti02-Cr203. This...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 |  | | Journal (article/letter/editorial) | | and the metasomatism of eclogites from the Jagersfontein Kimberlite: Punctuated transport and implications...xenoliths and associated metasomatism from the Jagersfontein Kimberlite are presented with the objectives...establishing possible links to cratonic magmatism. Jagersfontein eclogites are primarily bimineralic garnet 1...Shield in West Africa (Hills and Haggerty, 1989; Fung and Haggerty, 1995), to the Jagersfontein Kimberlite...Kimberlite in South Africa, which is ;130 km SE of Kimberley, and is dated at 86 1. INTRODUCTION The late 19th |  | | Journal (article/letter/editorial) | | kimberlite can be modelled by 5–10% contamination of local crust such as limestone or granite, into a magma...in only few locations beside Jericho, i.e. the State Line (USA, Eggler et al., 1979), Orapa (Botswana...(Botswana, Shee and Gurney, 1979), Veltevreden (S. Africa, Moore and Belousova, 2005) and the Democratic Republic...information than single crystals. Many ilmenite-free megacrystal intergrowths consist of coarse (10–20...peridotites and may be absent altogether. Other ilmenite-free megacrystal intergrowths have mosaic textures and |  | | Journal (article/letter/editorial) | | geological setting and kimberlites of the Udachnaya mine (Daldyn field, Yakutian diamondiferous province...spectroscopic (EDS) system equipped with a liquid nitrogen-free XMax-80 Silicon Drift Detector (Oxford Instruments...(diopside); Dj—djerfisherite; Dol—dolomite; Gk—geikielite; Grt—garnet (pyrope); Gth—goethite; HGM—hollandite-group...UV-13-233 was picked in the Udachnaya-East open-pit mine from a volcanoclastic partially serpentinized kimberlite...Rt Prv Cr-rich geikielite-ilmenite (Ilm1) ferroan geikielite (Ilm2) Fe-poor geikielite (Ilm2) Mn-rich |  | Tronche, E. J., van Kan Parker, M., de Vries, J., Wang, Y., Sanehira, T., Li, J., Chen, B., Gao, L., Klemme, S., McCammon, C. A., van Westrenen, W. (2010) The thermal equation of state of FeTiO3 ilmenite based on in situ X-ray diffraction at high pressures and temperatures. American Mineralogist, 95 (11) 1708-1716 doi:10.2138/am.2010.3410 | Journal (article/letter/editorial) | | pages 1708–1716, 2010 The thermal equation of state of FeTiO3 ilmenite based on in situ X-ray diffraction...of a natural terrestrial ilmenite (Jagersfontein mine, South Africa) and a synthetic reduced ilmenite...were fit to BirchMurnaghan thermal equations of state, which reproduce the experimental data to within...critical role. Keywords: Ilmenite, equation of state, X-ray diffraction, lunar magma ocean Introduction...interior of the Earth, the thermal equation of state of FeTiO3 ilmenite has not been studied extensively |  | | Journal (article/letter/editorial) | | inclusion with intergrown titanoclinohumite, olivine, geikielite, and mica(?) described by McGetchin and Silver...the bulk composition of the inclusion. Fluorine-free titanoclinohumite breaks down at low mantle temperatures...have formed by subsolidus reactions involving geikielite, olivine, and vapor or a hydrate. No good evidence...Metasomatic phlogopite in peridotite from the Jagersfontein kimberlite contains up to 3.4% BaO (Field et...veins in harzburgite from the Kimberley district of South Africa have been described by Haggerty et al |  | | Journal (article/letter/editorial) | | garnets from peridotite and eclogite xenoliths from Africa contain pyroxene lamellae suggested to have formed...and in some samples the garnets have an inclusion-free rim 0.3–0.7mm wide around inclusion-rich centers...given section can be inclusion-rich or inclusion-free but this distinction may be an artifact of the position...Haggerty and Sautter (1990) in xenoliths from the Jagersfontein kimberlite. As described below, the garnets...particularly striking in the case of garnet: inclusion-free grain rims are compositionally indistinguishable |  | | Journal (article/letter/editorial) | | armalcolite paragenesis. Such Ti-rich veins cause strong local enrichment in some incompatible trace elements,...Tompkins, 1984) and thus constrain the oxidation state of the latest metasomatic events 1. INTRODUCTION...identified in phlogopite-richterite peridotites from south African kimberlites, that are genetically related...the Kerguelen oceanic plateau originated in the South East Indian Ridge (SEIR) and was originally attached...stabilization of the oceanic lithosphere in the South East Indian Ridge; and reaction of the resultant |  | | Book (volume) | | 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...Plate No. 96. THIN SECTION (359, X 12) FONTEIN MINE BRONZITE PERIDOTITE FROM JAGERS facing page 368...following plate MINE THIN SECTION (8, x 12) BRONZITE PERIDOTITE FROM BuLTFONTEIN 98. MINE ,, ,, 99. THIN...THIN SECTION MINE - (3, X 12) BRONZITE PERIDOTITE FROM BOLTFONTEIN 102. THIN SECTION (176, X 12) ENSTATITE |  | | Journal (article/letter/editorial) | | earlier-crystallized oxide minerals (typically ferroan geikielite or magnesian ilmenite). Perovskite precipitates...“incompatible” elements. In some cases (Benfontein in South Africa), differentiation processes may have contributed...réactionnel sur des oxydes précoces (en général, geikielite ferreuse ou ilménite magnésienne). La pérovskite...hypabyssal-facies kimberlites such as the Benfontein sill in South Africa (Dawson & Hawthorne 1973). Numerous publications...far, have been described only from Jagersfontein in South Africa, and River Ranch in Zimbabwe (Haggerty |  | | Journal (article/letter/editorial) | | Mineralogical and chemical data of some Basutoland (South Africa) kimberlites are nresented. The minerals fall...Kimberley area of South Africa. Similar rocks are found elsewherein Africa, e.g.,SouthWest Africa, Northern Angola...western lowland areas and in river sectionsin the south, of alternating Karroo sandstones,mudstonesand shales(mainly...Conversely, the eastern highland kimberlites contain local nodules of shale and sandstone, carried through...Lherzolite nodule, kimberlite, Fm. Lourwencia, S. W. Africa. Analyst: M. H. Kerr. 3. Lherzolite dunite bomb |  | | Journal (article/letter/editorial) | | diamondiferous district, Siberian craton) is the worldwide renowned primary diamond mine, which carries...xenoliths carried out by kimberlite magmas in South Africa (Haggerty 1975, 1983, 1988, 1989; Jones et al...the central part of the Udachnaya-East open-pit mine at the depth interval 620–640 m. The xenolith is...compositions of magnetoplumbite-group minerals from South Africa (Haggerty et al. 1989), China (Dong et al. 1984;...0.500 0.470 0.012 0.022 13.439 1.004 LIMA (South Africa) K Figure 6. A-site occupancy of the studied |  | | Journal (article/letter/editorial) | | contents than do cores, suggesting that the oxidation state of the kimberlite, and thus its potential for diamond...thought to contain informa tion on the oxidation state of the kimberlite, the host magma that transports...at all." The kimberlites from the Iron Mountain district of Wyoming, USA (Smith, 1977; Eggler et al., 1979)...perhaps the most frequently cited example of a diamond-free group of kimberlites with oxidized ilmenite populations...and Cr 2 O 3 in ilmenites from Lesotho and West Africa. Although composi tions of many ilmenite populations |  | | Journal (article/letter/editorial) | | barometer for rutile–ilmenite assemblages: oxidation state of metasomatic agents in the mantle Donggao Zhao...metasomatic rocks 1. Introduction The oxidation state of the mantle provides a fundamental constraint...of equilibration in the mantle [7,10]. The redox state of mantle metasomatism has been characterized by...appears to be coupled with oxidation, i.e., oxidation state increases with increasing degree of metasomatism...Newlands kimberlite pipes in southern Africa. Therefore, the oxidation state of the MARID suite may provide |  | | Journal (article/letter/editorial) | | about 170 km southwest of Jaipur in the Rajasthan State, India (Fig. 1). Since its discovery in 1977, Rampura...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...and S. M. Gandhi MnTiO3 7O Pyrophanite MnTiO Geikielite MgTiO 3 IImenite FeTiO 3 40 FeTiO3 Fig. 5 |  | | Journal (article/letter/editorial) | | Canada M4H 1N6 b Mineral Services South Africa, Cape Town 7430, South Africa c University of Cape Town Kimberlite...Kimberlite Research Group, Cape Town 7700 South Africa d Mineral Services Canada, North Vancouver, British...All rights reserved. Keywords: Picroilmenite; Geikielite; Hematite; Kimberlite; Exploration; Classification...areas hosting kimberlite intrusions. In Southern Africa, ilmenites are present in the volcanic successions...Southern Africa Kimberlites On-craton Southern Africa Kimberlites Kimberlites West Africa North America |  | | Journal (article/letter/editorial) | | peraluminous granitoid suite from North-eastern Victoria. South-eastern Australia T. KAISERand G. J. WASSEREURG:...setting of Archaean metavolcanics from Kamataka State, South India 317 Book Reviews J. D. MACDOUGALL: “Nuclear...IRENEC, RIJBT%%A, P. A. SCHENCKand J, K. VOLE;MAN: Free, ester&d and residual bound . . sterols in Black...The chemistry of geothermal waters in Iceland. II. Mine~I equilibria and in~~ndent variables cont~lljng... BARBARABARREIRO:Lead isotopic compositions of South Sandwich Island volcanic rocks and their bearing |  | | Journal (article/letter/editorial) | | Ilmenites in B9297 are Cr-rich (0.7±1.6 wt% Cr2O3) geikielite±ilmenite-solid solutions with 0.3±0.4 wt% Nb2O5...LIMA from B9297 is comparable to that from Jagersfontein and the Kimberley cluster of kimberlites (Jones...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...layered Kimberlite-carbonate sill from Benfontein, South Africa. Contrib Mineral Petrol 76: 253±259 Boyd FR |  | | Journal (article/letter/editorial) | | shown;HaggertyandLindsley, 1969).Rt : rutile, Gk : geikielite,Ilm : ilmenite,Fe-Arm: FeTirOr,andMg-Arm: MgTiO'...Quarry, Texas, and by Haggerty (1975, 1983) from two South African kimberlite localities; armalcolite from...compressibilitydata for phasesused in this study Ref Rutile Geikielite llmenite MgTi,O, FeTi,Os Fe,TiOs -5.684 x -1...:Brownand Navrotsky (1989); 7 : set equal to geikielite;I : set equal to ilmenite;I : set equal to hematite...armalcolite rather than ilmenite (Lindsley for geikielite were estimated from the equation in Table et |  | Wang, Liping, Rouse, Roland C., Essene, Eric J., Peacor, Donald R., Zhang, Youxue (2000) Carmichaelite, a new hydroxyl-bearing titanate from Garnet Ridge, Arizona. American Mineralogist, 85 (5) 792-800 doi:10.2138/am-2000-5-620 | Journal (article/letter/editorial) | | High Pressure Research, Department of Geosciences, State University of New York at Stony Brook, Stony Brook...the crichtonite group but greater than those of geikielite and spinel. The estimated refractive index (2...spinel (Al), ilmenite (Fe), geikielite (Mg), V2O5 (V), and Nb2O5 (Nb). Geikielite was also used as a standard...content is related to elements that have a valence state different from Ti (i.e., Cr, Mg, and Al) as some...Wadsley Defekte im System Ti-Cr-O. Journal of Solid State Chemistry, 1, 445– 453. Foley, S.F. and Wheller |  | | 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-WYC•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, an• L. P. Black...CARBONATITEERUPTIVES AT SALTPETRE 111 KOP, SU•}tERLAND, SOU'iH AFRICA J. R. •cIver and J. Ferguson M•NERALOGY AND PETROLOGY...MINERAL CHEMISTRY OF A KIMBERLITE FROM THE PR•I•IER MINE: I•iPLICATIONS FOR THE EVOLUTION OF KiFmEHLITIC |  | | 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) | | km (where T » 800 °C and P 30 kbar) along the local geotherm. In addition to previously reported inclusions...al. 1976). The Garnet Ridge humites are almost F-free. Crichtonite series Minerals of crichtonite series...McDonough and Sun 1995). Compared to those from South Africa kimberlite (e.g., Haggerty 1983, 1991a; Schulze...ilmenite grains are calculated to have 50±60 mol% geikielite and 2±4 mol% hematite (Table 9). They also contain...pyrope host (Fig. 5a). Compared to those from South Africa kimberlite (e.g., Haggerty 1983; Schulze 1990) |  | | Journal (article/letter/editorial) | | kimberlites in the central Namibia (formerly South West Africa) volcanic field show similarities and contrasts...orbicular structures in carbonatites from Uganda, South Africa, Germany, Finland, and Russia. Structures have...Kaisertuhl, Germany (Keller 1981), Palabora, South Africa (Moore 1984), Kovdor, Russia (Krasnova et al...calcite in the Benfontein Sills, Kimberley, South Africa (Dawson and Hawthorne 1973). The calcite is...study. Modified from the “The Geology of Southwest Africa – Nambia” (Geological Survey 1982). Primary brown |  | | Journal (article/letter/editorial) | | E-type diamonds depending on abundance of Mg (geikielite) component (Sobolev et al., 1999). The most definitive...with silicates in cloudy and coated diamonds from Africa, Canada and Siberia (Izraeli et al., 2004; Klein-BenDavid...in the groundmass of a uniquely fresh serpentine-free Udachnaya kimberlite (Kamenetsky et al., 2004; Maas...Siberian diamonds Fig. 9. Nitrogen aggregation state (%B) plotted as function of nitrogen content (N...diamonds from Premier, Finsch and Jagersfontein mines, South Africa. in “Physics and Chemistry of the |
|
