 | | Journal (article/letter/editorial) | | Studsvik Kimberlitic zircons from 16 intrusions in Lesotho, the Republic of South Africa, and Tanzania have...Introduction Zircon is an accessory mineral found in most of the kimberlites. Usually, the zircon content...gram per ton or less (Dyke 170, cf. KRESTEN 1972; Kao (0.01 g/t), T. K. WHITELOCK, pets. comm.; Letseng...g/t), A. G. BLOOMER, pers. comm.). In some cases, zircon contents of about 25 g/t (Bultfontein, cf. HOLMLS...zirconium bulk in ldmberlites is represented bound in zircon. Taking an average Zr content of about 200 ppm |  | | Journal (article/letter/editorial) | | 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...minerals analyzed, only four (apatite. perovskite, zircon, ZrO.) show uranium contents > I ppm. Perovskite...(Akimov & Semenov 1970) is fairly well known. For Lesotho kimberlites, only a few analyses are available...technique (Wagner 1973) was used, with the large zircon KN279 (Table 3) as standar d material. Figures |  | | Book | | . . . . . . . . . . . . . . . . . . . 6.16.1. Zircon .................................................hamlet of Colesbergthe Kimberley Mine (De Beer's New Rush), the De Beers Mine (De Beer's Old Rush), and the...spell and pronounce the name of the main electoral district by calling it after his Lordship. The names "New...kimberlite provinces were discovered in Tanzania, Lesotho, Colorado-Wyoming (U.S.A.), and Yakutia (U.S.S...ground with descriptions of kimberlite fields in Lesotho and Namibia which were unknown to Wagner and Williams |  | | Report (issue) | | = 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. ...rare component of ultrama¯c kimberlite nodules (Kao kimberlite pipe, Association: Olivine, enstatite...perovskite, zircon, diamond, omphacite, rutile, carbonates, micas (Kao kimberlite pipe, Lesotho). Distribution: |  | | Journal (article/letter/editorial) | | g., zircon-bearing) are uncommon. Unusually Fe- and Ni-rich macrocrysts unique to the Lace mine are from...métasomatose intense, par exemple ceux qui contiennent le zircon, sont plutôt rares. Les macrocristaux inhabituels...inhabituels riches en Fe et en Ni provenant de la mine Lace semblent uniques; ils se sont formés à partir de...Star, 11 Lace, 12 Jagersfontein, 13 Liqhobong and Kao, 14 Monastery. Craton boundaries after de Wit et...Frank Smith, Monastery in South Africa, Kao and Liqhobong in Lesotho, and Jwaneng, Letlhakane and Orapa in |  | | Journal (article/letter/editorial) | | ages are often discordant (Davis, 1977). However, zircon is a relatively rare mineral in kimberlite and...Goadgevonden ; 4 = Beit Bridge; 5 = Colossus; 6 = Kao ; 7 = Jagersfontein; 8 = New Elands ; 9 = Swartruggens;...with some success on five post-Karroo occurrences (Kao, Jagersfontein, New Elands, Swartruggens and Finsch)...have been determined on samples from the Wesselton Mine (Allsopp and Barrett, 1975) and Bultfontein (Kramers...1983) yielding ages of 83 and 84 Ma, respectively. Zircon dating on samples from De Beers and Bultfontein |  | 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) | | xenocrysts. U–Pb and Th–Pb methods have been applied to zircon and baddeleyite (Davis et al., 1976). However,...Samples from the Kimberley area include: Wesselton Mine root zone hypabyssal rocks from kimberlite phases...phases W3 and W2 collected at the 680 m level of the mine (W3-680, W2-680a, W2-680b and W2-680c); and an opaque-oxide...South Africa. Samples from Thaba Putsoa (TP7) and Kao (Kao-K1, phase K1 or Gritty kimberlite of Clement (1973))...hypabyssal transitional kimberlites, respectively, from Lesotho. The perovskites in these samples are typically |  | | Book | | mica-bearing peridotite that in some parts of the mine contained so many xenoliths of carbonaceous shale...Iramba plateau west of Singida; only the Mwadui Mine at Shinyanga and one near Kahama have been sufficiently...Republic of South Africa, South-West Africa and Lesotho. The inland plateau of South Africa is the region...are more recent accounts of the kimberlites of Lesotho (Nixon 1973b); the kimberlites of S.W. Africa (Janse...the one striking WNW-ESE - has been termed the Lesotho trend (Crockett and Mason 1968); it is a dominant |  | SOMMER, H., WAN, Y., KRONER, A., XIE, H., JACOB, D. E. (2013) SHRIMP ZIRCON AGES AND PETROLOGY OF LOWER CRUSTAL GRANULITE XENOLITHS FROM THE LETSENG-LA-TERAE KIMBERLITE, LESOTHO: FURTHER EVIDENCE FOR A NAMAQUA-NATAL CONNECTION. South African Journal of Geology, 116 (2) 183-198 doi:10.2113/gssajg.116.2.183 | Journal (article/letter/editorial) | | A. KRÖNER, H. XIE AND D.E. JACOB 183 SHRIMP ZIRCON AGES AND PETROLOGY OF LOWER CRUSTAL GRANULITE XENOLITHS...XENOLITHS FROM THE LETSENG-LA-TERAE KIMBERLITE, LESOTHO: FURTHER EVIDENCE FOR A NAMAQUANATAL CONNECTION...granulites of the Letseng-la-Terae Diamond Mine in northeastern Lesotho provide evidence that the Tugela Terrane...Mesoproterozoic and is documented by SHRIMP metamorphic zircon ages of 1018 ± 18, 1126 ± 10 and 1127 ± 6 Ma. These...PETROLOGY OF LOWER CRUSTAL GRANULITE XENOLITHS, LESOTHO Figure 1. Overview map showing the principal tectonic |  | | Journal (article/letter/editorial) | | Griffin Suzanne Y. O’Reilly Æ N.I. Fisher Igneous zircon: trace element composition as an indicator of source...pegmatites. The geochemical signatures characteristic of zircon from some rock types can be recognised in bivariate...provide a rapid means of relating parent rock type to zircon trace element analysis; zircons from many rock...concentrates, and significantly enhance the usefulness of zircon in regional crustal studies and as an indicator...indicator mineral in mineral exploration. Introduction Zircon is a remarkable mineral because of its ubiquitous |  | | Journal (article/letter/editorial) | | island basalts (Eiler et al., 1997), some mantle zircon megacrysts (Valley et al., 1998), minerals included...Lake, Iron Mountain #26, Lekkerfontein, Kaalvallei, Kao, and Kamfersdam. 2. SAMPLES STUDIED We have determined...range in age from the approximately 1200-Ma Premier Mine in South Africa (Barrett and Allsopp, 1973) to the...13-53-62(ilm)c 13-54-34 13-54-34(ilm)c Monastery Mine, South Africa 13-73-6 13-73-7 13-73-8 13-73-9 13-73-10...13-45-33 13-45-40 13-45-46 Orapa, Botswana 13-80-13 Kao, Lesotho PHN2281-D1 PHN2281-D2 FRB260-D1 FRB260-D2 FRB260-D3 |  | | Journal (article/letter/editorial) | | 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....i963). A bluish-greengarnet, K47 from Kao kimberlite pipe, Lesotho, whose physical properties indicate |  | | Report (issue) | | Greenstone terrane, Ethiopia. Rig operated by Midroc Gold Mine pie. © 1VERC 2007 ISBN 978-0-85272-597-9 11 CONTENTS...Gambia 6 Ghana 6 Guinea 6 Ivory Coast 7 Kenya 7 Lesotho 7 Liberia 7 Libya 7 Madagascar 8 Malawi 8 Mali...available for consultation. Production Meta.ls Mine production of many metals is e;q)ressed in tenns...hydrate produced, whether or not calcined AnUmony, mine (I) Includes antimony content of antimonial lead...mineral but exhibiting similar properties Bismuth, mine ( l) The figures are in some instances derived from |  | | Journal (article/letter/editorial) | | kimberlite from the Thaba Putsoa, Letseng, Kao, Mothae (all Lesotho), Orapa (Botswana), Kallvallei and Star...dump (Kimberley, S. Africa) have been analysed. Zircon megacrysts from these localities have only been...clinopyroxenes– ilmenite intergrowths, ilmenites, zircon–ilmenite intergrowths and zircons (Gurney et al...were either part of bi-mineralic intergrowths with zircon, or large (cm or greater), deformation-free monocrystals...orthopyroxene, phlogopite, magnesian ilmenite, zircon and Fe-rich olivine, whereas, in Group II kimberlites |  | | Report (Issue volume) | | wollastonite at Willsboro, New York, and visited zircon sand workings and associated plant in Ohio and...visited beach-sand workings producing ilmenite, zircon and rutile in Queensland and Western Australia...and the large talc workings near Gouverneur, and zircon-sand workings and associated plant were visited...Experimental Officer. Thirty samples from the Emperor Gold Mine, Fij i, were assayed for gold and silver and traces...silver were also made on 91 samples from Peter's Mine, British Guiana. Analyses were made on 30 samples |  | | Journal (article/letter/editorial) | | Botswana Botswana Botswana Botswana Lesotho Lesotho Lesotho Lesotho Lesotho South Africa South Africa South...Letseng Letseng satellite pipe Kao Kao satellite Liquobong Benfontein De Beers mine Wesselton floors Kaalvallei...(e.g., Letseng–Letseng Satellite, Kao–Kao Satellite, and De Beers Mine–Dutoitspan–Wesselton Floors) also...perovskite is rapidly becoming to kimberlites what zircon has been to granites and other felsic silicate..., 1998. Cr-poor megacrysts from the Frank Smith Mine and the source regions of transitional kimberlites |  | | Journal (article/letter/editorial) | | and was later confirmed by ID-TIMS U–Pb dating on zircon and baddeleyite megacrysts: the average of 45 analyses...mineral species: Mg-ilmenite, diopside, pyrope, zircon, baddeleyite, corundum, Mg-chlorite, kyanite, rutile...kimberlite (or “proto-kimberlite”) magma (e.g. zircon, rutile) or be fragments of xenolith lithologies...recovered after the first stage of crushing at the mine. Only garnets are available from Kundelungu. The...Namibia (Koherab) (Bell and Rossman, 1992); Lesotho (Kao Mine–Letseng-la-terae–Thaba Putsoa–Solane) (Nixon |  | | Report (volume) | | ............................ Maryland and the District of Columbia................................................................. 2. Crystal Falls district, Michigan.................................. ....................... Schist from the Aragon iron mine............................... ill 17 .18 18 19................................... 51 7. Mesabi district, Minnesota....................................................................... 74 2. Butte district.............................................. |  | | Journal (article/letter/editorial) | | the northern part of the Panagyurishte mineral district. It lies within the Banat–Srednegorie metallogenic...Switzerland to dacitic in compositions. Single zircon grains, from three different magmatic rocks spanning...and the maximum age for magmatism at Chelopech. Zircon analyses of a dacitic dome-like body, which crops...of basement rocks during magmatism. In contrast, zircon grains in andesitic rocks from Chelopech are characterized...SEA Radka The Bulgarian Panagyurishte mineral district is a major ore producing area within the Eastern |  | | Report (volume) | | ......................... 82 Maryland and the District of Columbia.............................. 83 1......................... 4. The Castle Mountain district...........................'...-.. 5. The Highwood.............................. 2. The Pikes Peak district ...... ....:..........-.....--.-----.-3. Silver................................ 6. The Ten Mile district......................................... 7. The........................... 270 2. The Leadville district...... .................................. 271 3 |  | Garanin, V. K., Kudryavtseva, G. P., Matsyuk, S. S., Cherenkova, A. F., Cherenkov, V. G. (1990) DISCOVERY OF ZIRCON-BEARING ILMENITE-AMPHIBOLE PYROXENITE IN KIMBERLITE. International Geology Review, 32 (11) 1086-1094 doi:10.1080/00206819009465841 | Journal (article/letter/editorial) | | http://www.tandfonline.com/loi/tigr20 DISCOVERY OF ZIRCON-BEARING ILMENITEAMPHIBOLE PYROXENITE IN KIMBERLITE...Cherenkova & V. G. Cherenkov (1990) DISCOVERY OF ZIRCON-BEARING ILMENITE-AMPHIBOLE PYROXENITE IN KIMBERLITE...Diego] Date: 29 June 2016, At: 00:08 DISCOVERY OF ZIRCON-BEARING ILMENITE-AMPHIBOLE PYROXENITE IN KIMBERLITE...garnet, ilmenite, and amphibole, with accessory zircon, hydroxylapatite, and sulfides of the pyrrhoti...ilmenite differ in morphology and composition. Zircon, apatite, amphibole and ilmenite that is ferrimagnetic |  | Giuliani, Andrea, Phillips, David, Kamenetsky, Vadim S., Fiorentini, Marco L., Farquhar, James, Kendrick, Mark A. (2014) Stable isotope (C, O, S) compositions of volatile-rich minerals in kimberlites: A review. Chemical Geology, 374. 61-83 doi:10.1016/j.chemgeo.2014.03.003 | Journal (article/letter/editorial) | | hypabyssal kimberlite samples from: (a) the Diavik mine (Lac de Gras, Canada), and (b) the Gollapalle pipe...‘kimberlite megacrysts’ include analyses of garnet and zircon. 66 A. Giuliani et al. / Chemical Geology 374–375...of serpentine from southern African (Monastery, Kao; δ18O = 1.7–1.9‰) and Yakutian kimberlites (δ18O...volcanoclastic Kao (Lesotho), segregation Kao (Lesotho), pseudomorphic rim Kao (Lesotho), pseudomorphic...Letseng-la-terae (Lesotho), segregation Letseng-la-terae (Lesotho), pseudomorphic rim Letseng-la-terae (Lesotho), pseudomorphic |  | Chen, Yan-Jing, Zhang, Cheng, Wang, Pin, Pirajno, Franco, Li, Nuo (2017) The Mo deposits of Northeast China: A powerful indicator of tectonic settings and associated evolutionary trends. Ore Geology Reviews, 81. 602-640 doi:10.1016/j.oregeorev.2016.04.017 | Journal (article/letter/editorial) | | 1996), with the oldest age of 165.8 ± 2.8 Ma (zircon U-Pb age) obtained from the southern GHR (Wang... 2016b), and the youngest age of 129.71.6 Ma (zircon U-Pb age) obtained from the northern GHR (Zhang...deposit, which was D preliminarily constrained by a zircon UPb age of 202 Ma to have formed during the TE...been recently proven to be Early Cretaceous by zircon U-Pb AC dating. To sum up, Mo deposits in NE...and directions are widespread in the ore MA district, of which the approximately EW- and NE-trending |  | | Book (volume) | | Diamond-Graphite Ecologite From the Roberts Victor Mine, C. J. Hatton and John J. Gurney ................. Lower-Crustal Granulites and Eclogites From Lesotho, Southern Africa, W. L. Griffin, D. A. Carswell...and Garnet Harzburgite XenolithsFrom the Premier Mine, South Africa, R. V. Danchin ....................Geochemistryof Ultramarie NodulesFrom Pipe 200, Northern Lesotho, D. A. Carswell, D. B. Clarke, and R. H. Mitchell...... 145 Mafic and Ultramafic Xenoliths From the Kao Kimberlite Pipe, Ian D. MacGregor .............. |  | | Journal (article/letter/editorial) | | peridotites-evidence from kimberlites in the northern Lesotho Orange Free State (South Africa) and Botswana pipe...ilmenite) from different kimberlites of the northern Lesotho— eastern Orange Free State Cluster are characterised...It also provides an explanation for the range in zircon ages which are reported in some kimberlites Introduction...Letseng-la-terae (Letseng) kimberlite, located in northern Lesotho (from Lock, 1980). These, combined with published...northern Lesotho and the eastern Orange Free State (for convenience referred to as the Lesotho kimberlites |
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