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| Studsvik Kimberlitic zircons from 16 intrusions in Lesotho, the Republic of South Africa, and Tanzania have...use of zircons in order to identify and trace kimberlite intrusives is discussed, as there may be a possible...gram per ton or less (Dyke 170, cf. KRESTEN 1972; Kao (0.01 g/t), T. K. WHITELOCK, pets. comm.; Letseng...DAWSON1967b), only a few percent of the total Zr in the kimberlite is present in the form of zircon. Ilmenite, which...carries some 25~/0 of the total zirconium in the kimberlite. The remainder most likely occurs in the garnet |
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| and associated rocks, with special reference to Lesotho occurrences PETER KRESTE N LITHOS @ Kresten...and associated rocks, with special reference to Lesotho occurrences. Lithos 7. 171-180. Uranium contents...data published so far): basaltic kimberlite 2.35 ppm; micaceous kimberlite 4.91 ppm; ultrabasi c nodules...concluded that uranium must have been added to kimberlite from an outside source. P. Kresten. Department...(Akimov & Semenov 1970) is fairly well known. For Lesotho kimberlites, only a few analyses are available |
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| Stilbite and Associated Minerals from the Butha-Buthe District LESOTHO, SOUTHERN AFRICA T All specimens featured...collected by Herman du Plessis HE MOUNTAIN KINGDOM OF LESOTHO is located in southern Africa, landlocked and...hermanusduplessis@yahoo.com Figure 1. A typical rural scene in Lesotho. The layering of the various basalt lavas are clearly...visible on the slopes of the grass-covered hills. A Lesotho village of round, thatched huts is on the left...on drusy, botryoidal quartz, 4 cm, Butha-Buthe district, Lesotho. Bruce Cairncross specimen and photo |
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| 1007/s00710-018-0624-5 ORIGINAL PAPER The Liqhobong kimberlite cluster: an update on the geology Mafusi Rapopo...Cretaceous Liqhobong kimberlite cluster comprises six known diamondiferous Group 1 kimberlite bodies: the Main...(masl) in the rugged Maluti Mountain terrain of Lesotho. The cluster’s intrusion was structurally controlled...volcaniclastic kimberlite is always much more (>three times) than that of the coherent kimberlite. The larger...mountain . Lesotho . Kimberlite . Volcaniclastic . Kimberley-type pyroclastic kimberlite (KPK) Introduction |
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| petrology. Bibliography: p. Includes index. I. Kimberlite. I. Title. QE462.K5M58 1986 552' .3 ISBN 978-1-4899-0570-3...critique of the advances which have been made in kimberlite studies over the last twenty-five years. Kimberlites...in this book will serve to stimulate further kimberlite studies. Some of the hypotheses discussed will...University and for his help in the continuance of my kimberlite research. This book would not have been possible...Thunder Bay CONTENTS 1. Historical Aspects of Kimberlite Petrology . . . . . . . . . . . . . . . . . |
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| = 11.65 Z=8 X-ray Powder Pattern: Kao kimberlite pipe, Lesotho. 2.92 (100), 2.61 (100), 2.382 (80)...Total 100.68 100.00 33.54 26.68 (1) Kao kimberlite pipe, Lesotho; by electron microprobe, corresponding...Polymorphism & Series: Mineral Group: Occurrence: Lesotho). Forms a series with pyrope. Garnet group. ... A rare component of ultrama¯c kimberlite nodules (Kao kimberlite pipe, Association: Olivine, enstatite...carbonates, micas (Kao kimberlite pipe, Lesotho). Distribution: In the Kao kimberlite pipe, Lesotho. From the |
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| ilmenites from kimbedites in South Africa and Lesotho ROGER H. MITCHELL LITHOS Mitchell, R. H. 1977:...ilmenites from kimbcrlites in South Africa and Lesotho. Lia..u~ I"3, 29--37. Oslo. ISSN 00244937. Magnesium...and lamellar intergrowths with pyroxene from the Kao, SekameTag, Frank Smith, and Monastery kimberlites...Me, Nb, Zr, Cr, Cu, Zn, Mn, Co, and Ni. Each kimberlite contains discrete ilmenites which exhibit a wide...is one of the most characteristic minetaL~ of kimberlite, yet at the same time it is one of the most enigmatic |
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| (Wagner 1928) that the rounded inclusions found in kimberlite volcanoes provide a sampling of continental portions...these have been con sidered to be cognate with kimberlite magma (e.g. Williams 1932), they are now generally...as fragments of mantle existing at the time of kimberlite intrusion. This conclusion derives from their...regarded as cognate, i.e. as phenocrysts within the kimberlite magma (Nixon et al 1963) or as components of...mush magmas within the mantle in the vicinity of kimberlite magma formation (Nixon & Boyd 1973a). Additional |
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| palaeogeotherm in the upper mantle beneath northern Lesotho was inflected in late Cretaceous times, but the...mantle beneath stable cratonic areas, including Lesotho, Premier, Frank Smith, Siberia. Non-inflected geotherms...and temperatures of ultramafic xenoliths in the Lesotho kimberlites from Matsoku (Bishop et aI., 1978;... Liqhobong (Nixon and Boyd, 1973b; Mori, 1975), Kao (Nixon and Boyd 1973c; MacGregor, 1979), Pipe 200...relationships in the upper mantle beneath northern Lesotho at late Cretaceous times (G.L. Davis et al., 1976) |
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| one? First, in this book I have concentrated on kimberlite as an individual rock-type and a sampler of the...have concentrated more on specific aspects of kimberlite and upper mantle geology; as a result I have...Volumes of the two International Conferences on Kimberlite held at Capetown in 1973 and Santa Fe in 1977...who did much to stimulate my early interest in kimberlite. I acknowledge also the following people for.... . . . . . . . . . .. Indirect Evidence for Kimberlite Intrusions. .. Summary. . . . . . . . . . . |
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| U content (notably perovskite) and whole-rock kimberlite samples. U/Pb ratios in perovskite in the matrix...orders of magnitude larger than in the rest of the kimberlite material, and with simple mineral separation...100 Ma). The differences in U/Pb ratios between kimberlite samples from different parts of the same pipe...age determination methods have been applied to kimberlite dating. These include Rb-Sr on micas (Allsopp...However, zircon is a relatively rare mineral in kimberlite and can, if present at all, in most cases only |
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| Cretaceous nucleated autoliths. The samples are from Lesotho and from the area around Kimberley (Cape Province...plot, the initial lead isotope ratios of the kimberlite and autolith samples roughly define a slope of...ratios as well as with respect to this slope, the kimberlite and autolith lead isotopic pattern is comparable...Kimberley area and coarsegranular samples from Lesotho. Their 87Sr/86Sr ratios are generally between 0...heterogeneous on a regional scale. 1. Introduction Kimberlite pipes and fissures contain material which is |
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| Unusually Fe- and Ni-rich macrocrysts unique to the Lace mine are from Fe-rich orthopyroxene-bearing peridotites...cratonic mantle than the Kaapvaal mantle. Keywords: kimberlite, chromian spinel, magnesiochromite, southern...pourraient être des phénocristaux issus de la kimberlite hôte. Tout spinelle chromifère ayant un rapport...inhabituels riches en Fe et en Ni provenant de la mine Lace semblent uniques; ils se sont formés à partir...Kaapvaal. (Traduit par la Rédaction) Mots-clés: kimberlite, spinelle chromifère, magnésiochromite, Afrique |
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| lherzolite xenoliths in the kimberlites of northern Lesotho: revised P - T equilibration conditions and upper...that the inflected palaeogeotherm for northern Lesotho, previously highlighted by Boyd (1973), Boyd and...reality of an inflected palaeogeotherm for northern Lesotho. Rather, it reflects, at least in part, chemical...estimates for xenoliths in the kimberlites of northern Lesotho indicate a somewhat elevated, non-inflected, upper...the heat flux within the mantle beneath northern Lesotho at the time of emplacement of the Thaba Putsoa |
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| Netherlands 30 [41 GREEN GARNETS FROM THE NEWLANDS KIMBERLITE, CAPE PROVINCE, SOUTH AFRICA D.B. CLARKE 1 Department...green, uvarovite-rich garnet from the Newlands kimberlite have been analysed. The range ofCr20 3 is 10...are similar to garnets found in only one other kimberlite province, namely Yakutia. By combining data from...dichroic green-violet varieties from the Kao pipe in Lesotho [2]. This paper establishes the Newlands...locality of Ca,Cr-rich garnets in kimberlite. The Newlands kimberlite pipes are located 60 km northwest |
 | Wu, Fu-Yuan, Yang, Yue-Heng, Mitchell, Roger H., Li, Qiu-Li, Yang, Jin-Hui, Zhang, Yan-Bin (2010) In situ U–Pb age determination and Nd isotopic analysis of perovskites from kimberlites in southern Africa and Somerset Island, Canada. Lithos, 115 (1) 205-222 doi:10.1016/j.lithos.2009.12.010 | Journal (article/letter/editorial) |
| Laser ablation U–Pb ages Nd isotopes Perovskite Kimberlite Southern Africa Canada a b s t r a c t Determination...emplacement ages and initial isotopic composition of kimberlite by conventional isotopic methods using bulk rock...and are contemporaneous with other Cretaceous kimberlite magmatism in central Canada (103–94 Ma). Although...source of kimberlite magmas. © 2009 Elsevier B.V. All rights reserved. 1. Introduction Kimberlite is a unique... Several isotopic methods have been used for kimberlite age determination (Allsopp et al., 1989). Although |
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| diamonds such as the 603 carat Lesotho Promise, recovered from the Letseng Mine in 2006, help to drive a multi-billion...carat Lesotho Promise recovered in August 2006 from Gem Diamonds Limited's Letseng le Terai Mine in the...the north eastern highlands of the Kingdom of Lesotho. This diamond was tendered in Antwerp by WWW International...mystique of exceptional quality diamonds such as the Lesotho Promise are a welcome boost to drive a ⁎ Corresponding...exploration methods. A compendium of world wide kimberlite distribution and the formation of diamond is |
 | Hetman, Casey M., Scott Smith, Barbara, Robey, Jock, Nkotsi, Teboho, Mohapi, Mohapi, Mohapi, Thabang (2018) Letšeng diamond mine, Lesotho: a variant of Kimberley-type pyroclastic kimberlite emplacement. Mineralogy and Petrology, 112. 365-382 doi:10.1007/s00710-018-0642-3 | Journal (article/letter/editorial) |
| Letšeng diamond mine, Lesotho: a variant of Kimberley-type pyroclastic kimberlite emplacement Casey...2018 Abstract The Letšeng Diamond Mine comprises two ~91 Ma kimberlite pipes. An update of the geology...volcanic pipes comprises a number of phases of kimberlite with contrasting diamond contents which were...volcaniclastic kimberlite (RVK), Kimberley-type pyroclastic kimberlite (KPK), coherent kimberlite (CK) and...and minor amounts of hypabyssal kimberlite (HK). The pipes are compared with KPK occurrences from southern |
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| online 31 March 2009 Keywords: Southern Africa Kimberlite Perovskite Sr-isotopes a b s t r a c t New in...dataset also contains 4 samples of transitional kimberlite from 3 off-craton intrusions. The perovskite...geographically separated Wajrakarur and Narayanpet kimberlite fields. In contrast, by analysing groundmass perovskite...long-standing question of the extent to which kimberlite magmas derive from the subcontinental lithospheric...Wajrakarur and Narayanpet results is that the kimberlite magmas were derived from two subtly different |
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| CHROMIUM GARNET END MEMBER, KNORRINGITE, FROM KIMBERLITE PnrBn H. NrxoNl aNl GeoncB HonnuNc, Departmentof...electron probe confirms that a garnet from Kao kimberlite pipe in Lesotho contains a large proportion of the...has been discredited (:uvarovite). The garnet from Kao, with 17.4TaCrsos, is green, o: 11.65,n:1.803, G...pyrope from E9 lherzolite nodule from Liqhobong, Lesotho, gave 5.14 percent CrzOr and a full analysis of...pyrope from E10 serpentinisednodule from Sekameng,Lesotho gave 7.52 percent Cr2Os(table 1) (Nixon et aI. |
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| 1968 ORIGIN OF SOME ECLOGITE INCLUSIONS IN KIMBERLITE Iruo Kusurto,r GeologicalInsti.tute, Uniaersity...Aesrnacr Of six eclogite inclusions in kimberlite of Roberts-Victor mine near Kimberley, South Africa, three...similar to those in the eclogites from other kimberlite pipes, but much difierent from those in eclogites...of their formation are different; eclogites in kimberlite were equilibrated in the upper mantle. Phlogopite...within the upper mantle before the eruption of kimberlite. The compositions of the eclogites correspond |
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| 1980 Oxide mineralsin the Liqhobongkimberlite, Lesotho Nenn Z. BocToR AND F. R. Boyo Geophy sical Lab...The oxide minerals in kimfsllile from Liqhobong, Lesotho,are representedby discreteilmenite nodules, groundmassilmenite...The physical and chemical changesundergoneby kimberlite magma during its eruption and crystallization...can be gained by study of groundmassminerals in kimberlite and of late-stagereactionsbetween kimberlitic...kimberlitic minerals and the residualfluids of kimberlite magma.Boyd and Clement (1977)describedmetasomatic zoning |
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| h o s Tuffisitic kimberlites from the Wesselton Mine, South Africa: Mineralogical characteristics relevant...June 2009 Available online 1 July 2009 Keywords: Kimberlite Tuffisitic Diatreme Magmaclast Chlorite Diopside...r a c t Tuffisitic kimberlites from the Wesselton Mine consist, in order of formation, of the following...some similarities to holocrystalline hypabyssal kimberlite but lack monticellite, carbonate, carbonate-serpentine...to spinels in spatially-associated hypabyssal kimberlite. Pre-existing solids, including discrete olivine |
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| isotope variations in Cr-poor megacrysts from kimberlite DANIEL J. SCHULZE,1,* JOHN R. VALLEY,2 DAVID...Cr-poor megacrysts from kimberlite demonstrate that the megacrysts and kimberlite hosts are genetically...higher ␦18O). Actual samples of potential Group II kimberlite source rocks (e.g., mica/ amphibole veined peridotites)...mantle garnets from the Cr-poor megacryst suite in kimberlite (e.g., Nixon and Boyd, 1973; Eggler et al., 1979;...fractional crystallization products of their host kimberlite or related magmas and their radiogenic “isotope |
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| and Other Volcanics SECOND INTERNATIONAL KIMBERLITE CONFERENCE SPONSORS American Geophysical ...AmericanGeophysicalUnion Washington,D.C. 20006 1979 the Second Kimberlite Conference The MantleSample: Inclusionsin Kimbcrlites...primarily a book about the bus. Papers contained Kimberlite this in these volumes were presented at the...of mantle models developed through study of kimberlite xenoliths, basalt xenoliths and through geophysical...important impact on progress in mantle petrology and kimberlite-oriented research, but the needed rationalization |
