 | | 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) | | of Phlogopite and Potassic Richterite Bearing Peridotite Xenoliths from South Africa Ken-ichiro Aoki Institute...containing primary phlogopite with or without potassic richterites as major constituent (up to 12 vol... %) are rarely found in kimberlite from the Bultfontein Floors. Chemically, these rocks are similar in...granular type garnet peridotite xenoliths from South Africa and Lesotho, except for an abnormally high content...content of K20 in the former. Phlogopite and potassic richterite are thought to have the following genesis: |  | | 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...similar Cretaceous age, Bultfontein (Kimberley district) and Thaba Putsoa (northern Lesotho), was undertaken...orthopyroxene compositions indicate haba Putsoa Bultfontein (Kimberley cluster) 0 i . . . . 500 i km Fig |  | | Book | | not attempted to describe diamond prospecting and mining and, although I have attempted to give some of...with whose research groups at the universities of Cape Town and Chicago I have had long and fruitful collaboration...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. . . . . . . . . . |  | | Journal (article/letter/editorial) | | 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...Presentaddress: Stockdale Prospectint-Ltd., 60 Wiison Street, South yarra, Victoria 3141,Australia. 0003-004x/83/0505-M94$02...comparable' Associatedcharacteristic minerals are K-richterite, phlogopite, Nb-Cr-rutile and Nb-CrMg-ilmenite...from the De Beers kimberlite in the Republic of South Africa (RSA) and the mineral has since been recognized |  | | Report (chapter) | | U M M A R Y : Kimberlites are rare ultrabasic potassic low-volume melts that originate in the diamond...xenocrysts may also be Kimberlites are rare ultrabasic potassic igneous present. Kimberlite may contain diamond...extremely suscep'Kimberlite is a volatile-rich potassic, ultratible to calcitization under high Pco2 conditions...minerals are commonly altered 1 In the case of S Africa, the micaceous by deuteric processes, mainly serpentinisation...by other high-K minor intrusives, as at the Helam Mine in the Swartruggens area of the western Transvaal |  | | Journal (article/letter/editorial) | | Abstract Kimberlite magmas from the Kimberley area of South Africa have sampled two main types of phlogopite-rich...mineral association mica (phlogopite)–amphibole (K-richterite)–rutile–ilmenite–clinopyroxene and the second...and metasomatised, the upper mantle beneath the Kimberley area as indicated by the trace element characteristics...Geological Sciences, University of Cape Town, 7700 Rondebosch, South Africa Editorial responsibility: T.L...kimberlites of Kimberley for at least 80 years (e.g. Wagner 1914), it was only in 1970 that K-richterite was reported |  | | Report (chapter) | | mantle events and diatreme ascent rates in southern Africa and Malaita, Solomon Islands JO-ANNE WARTHO* &...xenoliths and megacrysts from Kimberley, Monastery and Letseng in southern Africa, and Malaita, in the Solomon...Kaapvaal craton: De Beers, Bultfontein, Kamfersdam and Monastery in South Africa, and Letseng in NE Lesotho...from 114 to 150 Ma (Smith 1983). The De Beers, Bultfontein and Kamfersdam kimberlite diatremes are spatially...associated pipes clustered around the city of Kimberley. These pipes have been mined for over a century |  | | Journal (article/letter/editorial) | | of oxidizing conditions. The amphibole is potassic richterite. Micas of the megacryst suite in kimberlite...occur in the Bultfontein, De Beers, Wesselton and Dutoitspan kimberlite diatremes, S. Africa (WAGNER, 1914;...rocks from the De Beers Mine (WILLIAMS, 1932), mica-apatite rock, Newlands Mine (WAGNER, 1914), phlogopiteeolivine...proportions of the minerals phlogopite, potassic-richterite and diopside; ilmenite and rutile are the...Roberts Victor Mine, the minerals of which have MARID-type composition, though lacking richterite. Another |  | Fitzpayne, Angus, Giuliani, Andrea, Hergt, Janet, Phillips, David, Janney, Philip (2018) New geochemical constraints on the origins of MARID and PIC rocks: Implications for mantle metasomatism and mantle-derived potassic magmatism. Lithos, 318. 478-493 doi:10.1016/j.lithos.2018.08.036 | Journal (article/letter/editorial) | | Implications for mantle metasomatism and mantle-derived potassic magmatism Angus Fitzpayne, Andrea Giuliani, Janet...Implications for mantle metasomatism and mantle-derived potassic magmatism. Lithos (2018), doi:10.1016/j.lithos...Implications for mantle metasomatism and mantle-derived potassic magmatism Angus Fitzpayne 1,* 1,2 1 afitzpayne@student...Ryde, 2109 New South Wales, Australia Department of Geological Sciences, University of Cape Town, Rondebosch...Rondebosch 7701, South MA 3 AC CE Corresponding author. PT E * D Africa ACCEPTED MANUSCRIPT Abstract |  | | 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...were predominantly phlogopite and diopside (4- K-richterite, + ilmenite, + futile). Furthermore the compositions...which are mostly from Bultfontein, with some from other pipes of the Kimberley cluster, and two from...from Newlands, ~ 60 km north-west of Kimberley. Olivine is absent from MARID rocks and enstatite is only |  | | 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) | | PHLOGOPITE NODULES AND PHLOGOPITE-BEARING PERIDOTITES IN SOUTH A F R I C A N KIMBERLITES ICHIRO KANEOKA Geophysical...nodules from Bultfontein and phlogopite nodules from Du Toitspan, Kimberley area, South Africa. Neither definite...in eclogite inclusions from Roberts-Victor mine, South Africa, and those in breccia from the pipe at Delegate...upper mantle origin [6], are sometimes found in South African kimberlites. Several attempts have been...peridotite inclusions and phlogopite nodules from South Africa in order to determine their formation ages and |  | | Journal (article/letter/editorial) | | concluded that lherzolite nodules containing K-richterite and/or phlogopite are products of series of metasomatic...and two lherzolites containing phlogopite and K-richterite were studied. The sample localities together...Monastery Mine, South Africa, and omphacite and garnet from an eclogite from the Roberts Victor Mine, South...South Africa. The samples from Monastery and Roberts Victor were analyzed for the trace elements by J.L...sample f r o m the F r a n k Smith pipe, S o u t h Africa ( F R B 81) a n a l y z e d by Boyd (1974) gives |  | | Journal (article/letter/editorial) | | Cretaceous kimberlite of the central Kaapvaal Craton, South Africa. Two episodes of interaction between the host...Subsequent modal metasomatism formed phlogopite + K-richterite + crichtonite-group (lindsleyite–mathiasite)...the highest Cr content reported so far for K-richterite. SIMS U–Pb dating of the zircons yields ages...emplacement ages of Cretaceous kimberlites in the Kimberley area. The age spread is interpreted as a result...between Cretaceous kimberlite activity and hydrous potassic metasomatism in the central Kaapvaal Craton lithosphere |  | Hopp, Jens, Trieloff, M., Brey, G.P., Woodland, A.B., Simon, N.S.C., Wijbrans, J.R., Siebel, W., Reitter, E. (2008) 40Ar/39Ar-ages of phlogopite in mantle xenoliths from South African kimberlites: Evidence for metasomatic mantle impregnation during the Kibaran orogenic cycle. Lithos, 106 (3) 351-364 doi:10.1016/j.lithos.2008.09.001 | Journal (article/letter/editorial) | | Ar/39Ar-ages of phlogopite in mantle xenoliths from South African kimberlites: Evidence for metasomatic mantle...lithosphere Ar–Ar dating Metasomatism Southern Africa a b s t r a c t We applied the 40Ar/39Ar dating...(dominantly garnet bearing) from the mines of Bultfontein (South Africa), Letseng-laTerae and Liqhobong (Lesotho)...meaningful and assigned to metasomatism of the local cratonic mantle during the advent of Kibaran orogenesis...The cratonic lithospheric mantle below southern Africa may have been frequently influenced by different |  | | Book | | calcite, clay minerals and fragments of crustal and local host country-rock. At Lattavaram the kimberlite...Iherzolite nodules in kimberlites(from Lesotho and South Africa) and were analysed for isotopic compositions...Extended Abstract, First Kimberlite Conference, Cape Town, 23. Basu, A. R. and Murthy, V. R.(1977) EPSL...University of the Witwatersrand, Johannesburg, 2001, South Africa) Radiometric age determinations were undertaken...undertaken on 15 kimberlite occurrences in Southern Africa, emphasis being placed on a wide areal distribution |  | | Journal (article/letter/editorial) | | metamorphism, and metasomatism: The complex history of South African upper-mantle symplectites Stephen W. Field*...are found in the Horoman peridotite complex in northern Japan (Takahashi and Arai 1989), in ultramafic...(Zuyev 1971). In a study of peridotites from South Africa (Field and Haggerty 1994), up to one third of...in upper mantle peridotite xenoliths included in South African kimberlites. Symplectites are described...Monastary, Bultfontein, and Wesselton kimberlites (Dawson and Smith 1975), the Frank Smith Mine (Exley et |  | | Journal (article/letter/editorial) | | TRACE ELEMENTS IN KIMBERLITES FROM THE KIMBERLEY AREA (SOUTH AFRICA) Y. M U R A M A T S U and K.H. W E D...trace elements in kimberlites from the Kimberley area (South Africa). Chem. Geol., 51: 289--301. New data...xenolith and 1 eclogite xenolith from the larger Kimberley area are used to constrain models for kimberlite...K i m b e r l i t e Conferences in Cape T o w n , S o u t h Africa; S a n t a Fe, New Mexico, U.S.A.;...for 11 kimberlites and their xenoliths from the Kimberley area normalized to chondrites. Compared to common |  | | Journal (article/letter/editorial) | | ocs.mq.edu.au W.L. Grin CSIRO Exploration and Mining, PO Box 136, North Ryde, NSW 1067, Australia J...Geoscience Centre, PO Box 82232, Southdale, 2135, South Africa Editorial responsibility: T. L. Grove the xenoliths...Archaean Kaapvaal and Zimbabwe cratons in southern Africa (Dawson and Smith 1977; Waters and Erlank 1988;...(Botswana), approximately 800 km north of Kimberley (South Africa). The metasomatism in these xenoliths is...similar in these respects to those from the Bultfontein kimberlite, described previously by Erlank and |  | | Journal (article/letter/editorial) | | titanates from the Jagersfontein kimberlite, South Africa: Implications for metasomatism in the upper...origin of alkalic rocks, the generation of highly potassic magmas in the upper mantle, and suggest that alkali...1982; JONES et al., 1982). DAWSON ( 1982) has in richterite. Fragmentary proposed that two contrasting types...geochemistry, given that leucite-lamproities in West Kimberley, Australia (WADEand PRIDER, 1940; PRIDER, 1960)...upper mantle, and based on the stabilities of K-richterite and armalcolite it is inferred that metasomatism |  | | Journal (article/letter/editorial) | | Geochemistry, University of Cape Town, Rondebosch 7700, Cape Town, South Africa ‘Isotope Geochemistry Facility...Facility, DEMAST, CSIR, PO Box 395, Pretoria 000 1, South Africa (Received February 9, 1989; accepted in revisedform...concentrates from the Jagersfontein kimberlite. At Bultfontein these minerals are associated with the metasomatic...metasomatic events involving the formation of richterite (ERLANK et al., 1987). However despite an extensive...Free State, lies 75 km to the southeast of the Kimberley kimberlite pipe cluster and contains a varied |  | | Journal (article/letter/editorial) | | Garnet Lherzolites from the Kaapvaal Craton (South Africa): Trace Element Evidence for a Metasomatic History...GEOLOGICAL SCIENCES, UNIVERSITY OF CAPE TOWN, RONDEBOSCH 7701, SOUTH AFRICA 2 DEPARTMENT OF EARTH, ATMOSPHERIC...features of mantle peridotite xenoliths of southern Africa JOURNAL OF PETROLOGY VOLUME 44 so that it is...character (Harte, 1983) as well as more hydrous, potassic fluids that may be similar to lamproite or its...Dawson & Smith, 1977), PKP (Phlogopite and K-richterite-bearing Peridotites; Erlank et al., 1987) type |  | | Journal (article/letter/editorial) | | garnets from the subcontinental mantle of southern Africa David R. Bell and George R. Rossman Division of...occurring as xenoliths in kimberlites of southern Africa. OH abundances, using the best currently available...garnets from the wellstudied kimberlites of southern Africa, and to determine if these variations are linked...from xenoliths erupted in kimberlites of southern Africa. This area was chosen for study due to ready sample...thickness (1) # 14 13 0 Fig. 1. Map of southern Africa showing location of kimberlites yielding xenoliths |  | | Journal (article/letter/editorial) | | cannot -p be ruled out as a component of the Kimberley kimberlites’ source. Mantle-like ε205Tl values...The SCLM beneath the Kaapvaal craton in southern Africa is thought to be the residue of high degree partial...and/or exotic phases including phlogopite, K-richterite, and titanates (e.g., Aoki, 1974; Erlank and...na xenolith suites, and particularly those from South African localities (e.g., Dawson and Smith, 1977;...found as xenoliths entrained by the Kimberley kimberlites in South Africa (e.g., Grégoire et al., 2002). 5 |
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