 | | Journal (article/letter/editorial) | | Mineralogy andgeochemistry of theLueshe deposit, Kivu, BelgianCongo... 734 Geochemical characterof ca...geochemical study of carbonatitesamplesfrom Lueshe,Kivu, Belgian Congo,by the combinedX-ray diffraction-flu...discoveringa niobium-bearingcarbonatitein Kivu, Belgian Congo. INTRODUCTION TEE ore minerals of nlobium...microlite are associatedwith magnetite, monazite,rutile and other mineralsin the black sands. The original...from the niobium-bearing carbonatiteof Lueshe,Kivu, Belgian Congo. characterized by a markedimpoverishment |  | | Journal (article/letter/editorial) | | discoveryof pyrochlore in carbonatites (Arax/t, 1947; Lueshe,1956) whichset up columbiumas one of the major...major depositsand especially Messrs.Bradford,A. Burne,Dr. de Neve, Major Farrington,Dr.Ing. Hermann, Messrs...The writer is indebted to Dr. Charles H. Behre,to Dr. RichardH. Jahnsand Dr. KennethBurke who kindly...Perovskite: alkaline rocks,carbonatites,nephelinesyenites Rutile: alluvia, syenites,veins Niobosilicates: basic...diathreme. Internal StructureoI ColumbiumCarbonatites.-Lueshe: 1. core of busorite (canefinite syenite) 2. intermediatering |  | | Journal (article/letter/editorial) | | been found in the Kirumba syenitic massif, Kivu, Rep. of Congo (Kinshasa). Its properties are described...massif and the alkaline complex with carbonatites of Lueshe. Une seconde occurrence de davidite non-metamicte...dans le massif sy4nitique des Kirumbas, Kivu, R4p. du Congo (Kinshasa). Ses propri4t4s sont d4crites...Kirumbas et le complexe alcalin ~ carbonatites de Lueshe. Since its first description by Mawson in 1906...minerals of the Kirumba massif, in the north-eastern Kivu, Rep. of Congo (Kinshasa), non-metamict davidites |  | | Report (issue) | | [0.05] . Total [99.86] [99.89] 100.74 (1) Lueshe, Congo; original total given as 100.192%, corrected...corrected for goyazite 7.8%, ilmenite 2.0%, (rutile, brookite, anatase) 1.3%, calcite 0.9%, kaolinite 0.55%,...066%, corrected for goyazite 7.5%, ilmenite 1.9%, (rutile, anatase) 1.1%, calcite 1.6%, kaolinite 0.4%, goethite...ilmenite, rutile, barian goyazite. Distribution: In the Lueshe carbonatite, 150 km north of Goma, Kivu Province...Province, Congo (Zaire). Name: For a member of the pyrochlore group with a prefix to indicate dominant H2O |  | | Journal (article/letter/editorial) | | decomposition of pyrochlore and formation of Nb-bearing rutile, brookite, and anatase. The Nb contents of the...Similar supergene occurrences occur at Lueshe and Bingo (D.R. Congo), Mabounié (Gabon), Sukulu (Uganda)...date, all major operating and former (Oka, Fen, Lueshe) Nb mines have been developed in primary carbonatites...only operating Nb mine in under-saturated peralkaline syenites is the Karnasurt mine (Kremenetsky et al...Sn–Ti–Ta minerals such as cassiterite, ilmenite, rutile, ixiolite, wodginite, and columbite–tantalite group |  | Chakhmouradian, Anton R., Reguir, Ekaterina P., Kressall, Ryan D., Crozier, Jeremy, Pisiak, Laura K., Sidhu, Ravinder, Yang, Panseok (2015) Carbonatite-hosted niobium deposit at Aley, northern British Columbia (Canada): Mineralogy, geochemistry and petrogenesis. Ore Geology Reviews, 64. 642-666 doi:10.1016/j.oregeorev.2014.04.020 | Journal (article/letter/editorial) | | contained in rutile, phlogopite and, to a much lesser extent, amphibole. When the passive margin of North America...euxenite, Mg-rich ferrocolumbite and Nb-bearing rutile) typically occurring as scarce minute crystals...covering the Precambrian basement rocks of the North American craton (Price, 1994 and references therein)...Neoproterozoic to Jurassic on the passive margin of the North American protocontinent and in the adjacent ocean...Secondary pyrochlore, minor ferrocolumbite and rutile (REE phosphatesb) 1.18 Mtc at 6.71% Nb2O5, 10 |  | | Journal (article/letter/editorial) | | Pyrochlore from weathered carbonatite at Lueshe, Zaire F. WALl.,C. T. WILLIAMS,A. R. WOOIJ.EY Department...pyrochlore in the laterite above carbonatite at Lueshe, NE Zaire, has been made in order to determine...variations. Pyrochlore in fresh carbonatite at Lueshe is close to an ideal formula of (Ca,Na)2Nb206(OH...worldwide. As a result weathered pyrochlore at Lueshe has a large apparent A cation deficiency with A...remain stable. Abundant kalipyrochlore is unique to Lueshe and is thought to be related to the abundance of |  | | Journal (article/letter/editorial) | | common in the residualsoils of the Lueshe carbonatitedeposit,Kivu, Zaire.The niobiummineralizationis...refractive indices of kalipyrochlores and pyrochlores (Lueshe dePosit) Pyrochlore species Analyzed Na-Ca pyrochlores...partially weatheredpyrochloreand kalipyrochlorefrom Lueshe Elenents analyzed PartlaIIy \reathered green...which disappears lmpurities Goyazite Ilnenlte Rutile, Anatase Cal-clte Kaolinlte Goethite arouncl ...someniobium-bearing als of the Lueschecarbonatitedeposit(Kivu, Rep. of Congo). EuratomRep.2l10e. Manuscriptreceiued,October5 |  | Melgarejo, Joan C., Costanzo, Alessandra, Bambi, Aurora C.J.M., Gonçalves, Antonio O., Neto, Andrés B. (2012) Subsolidus processes as a key factor on the distribution of Nb species in plutonic carbonatites: The Tchivira case, Angola. Lithos, 152. 187-201 doi:10.1016/j.lithos.2012.06.024 | Journal (article/letter/editorial) | | areas. Sr-, Ba- and Pb-pyrochlores and Nb-rich rutile replace earlier pyrochlore generations and are...oxidising conditions for mineral precipitation. Nb-rich rutile, gorceixite, Ba-rich K-feldspar and late Ba-poor...of primary ores have been converted to supergene rutile (Dardenne and Schobbenhaus, 2000). The Tchivira...Kα); orthoclase (K, Kα); wollastonite (Ca, Kα); rutile (Ti, Kα); rhodonite (Mn, Kα); Fe2O3 (Fe, Kα); celestine...set of faults oriented NE–SW that cut the Angola–Congo craton (Issa Filho et al., 1991). Different types |  | | Journal (article/letter/editorial) | | hydrous silicates in the Kvaløya lamproite dyke, North Norway Kåre Kullerud & Dmitry Zozulya & Erling J...The mineral was first described from the Bayan-Obo mine in Inner Mongolia, China. On the type locality,...Buryatia, Russia (Koneva et al. 2008), Lueshe, Democratic Republic of Congo (Wall et al. 1996), and Haast, New...been reported from a carbonatite in Lueshe (Democratic Republic of Congo)(Wall et al. 1996). Baotite from...shows a Fig. 1 Geological map of Kvaløya Island, North Norway, showing sampling localities. Modified from |  | Torró, L., Villanova, C., Castillo, M., Campeny, M., Gonçalves, A. O., Melgarejo, J. C. (2012) Niobium and rare earth minerals from the Virulundo carbonatite, Namibe, Angola. Mineralogical Magazine, 76 (2) 393-409 doi:10.1180/minmag.2012.076.2.08 | Journal (article/letter/editorial) | | it replaces strontianite (Fig. 6c). Niobium-rich rutile (Nb2O5 in the range 14.1718.48 wt.%) is found...by late-stage rhabdophane-(Ce). (d) Niobium-rich rutile with complex internal zoning. Scanning electron...(SiKa); orthoclase (KKa); wollastonite (CaKa); rutile (TiKa); rhodonite (MnKa); Fe2O3 (FeKa); celestine...~47% Fe 2+ in secondary pyrochlore from the Lueshe mine in Congo. However, the total amount of iron, Fet...hydrothermal alteration were described at Lueshe mine in Congo by Nasraoui et al. (1999) and Nasraoui and |  | | Book (edition) | | localities as inclusions in the limestone”’ (italics mine). Actually, the first published description of...‘‘fine-grained but crystalline,” (5) that they were 1] thank Dr. G. R. Udas for bringing this historic description...carbonatite dikes cutting the kimberlite of the Premier mine (p. 542) he classed as magmatic, but 1 Bowen admitted...G. B. Du Bois (1956, 1959), B. C. King (1949). Congo (Belgian): A. Meyer and P. de Bethune (1958, 1960)...) around a “core” of alkalic silicate rock: Lueshe, Congo, and Chishanya, Southern Rhodesia. In some cases |  | Zozulya, D. R., Savchenko, E. E., Kullerud, K., Ravna, E. K., Lyalina, L. M. (2010) Unique accessory Ti-Ba-P mineralization in the Kvalöya ultrapotassic dike, Northern Norway. Geology of Ore Deposits, 52 (8) 843-851 doi:10.1134/s1075701510080167 | Journal (article/letter/editorial) | | orthoclase (40– 50), apatite (5–7), baotite (up to 3), rutile (1–3), zir con, quartz, and barite. Some samples...(b–e) baotite and (f) rutile in the Kvalöya dike. BSE images. Ap, apatite; Rut, rutile. 2d). No contacts...contacts with rutile, which is another Tibear ing mineral, were observed. The chemical composition of baotite...deposit (Semenov et al., 1961), carbonatites of Lueshe (Wall et al., 1996) and the Haast region (Cooper...al., 1961) NT522 1.53 101.39 Carbonatite, Lueshe (Wall et al., 1996) Carbonatite, Haast (Coo per |  | Melcher, Frank, Graupner, Torsten, Gäbler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, Oberthür, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalum–(niobium–tin) mineralisation in African pegmatites and rare metal granites: Constraints from Ta–Nb oxide mineralogy, geochemistry and U–Pb geochronology. Ore Geology Reviews, 64. 667-719 doi:10.1016/j.oregeorev.2013.09.003 | Journal (article/letter/editorial) | | Ma) 4.1.1. Man Shield (Sierra Leone) NU 4.1.2. Congo Craton (DRC) 4.1.3. Zimbabwe Craton (Zimbabwe) ...Côte d'Ivoire) 4.2.2. North-eastern DRC (Ubendian, Orientale and northern North Kivu) D 4.3. Neoproterozoic...provinces MA 5.1. Archean 5.1.1. Man Shield 5.1.2. Congo Craton 5.2. Paleoproterozoic CE P 5.2.1. Birimian...Kaapvaal Craton D 5.1.3. Zimbabwe Craton 5.2.2. North-eastern DRC 5.3. Neoproterozoic 5.3.1. Kibara Belt...oxides T 6.4. Other Ta-Nb-rich phases IP 6.5. Rutile 7. Discussion SC R 7.1. Formation of TNO in granites |  | Villeneuve, M., Gärtner, A., Kalikone, C., Wazi, N., Hofmann, M., Linnemann, U. (2019) U-Pb ages and provenance of detrital zircon from metasedimentary rocks of the Nya-Ngezie and Bugarama groups (D.R. Congo): A key for the evolution of the Mesoproterozoic Kibaran-Burundian Orogen in Central Africa. Precambrian Research, 328. 81-98 doi:10.1016/j.precamres.2019.04.003 | Journal (article/letter/editorial) | | rocks of the Nya-Ngezie and Bugarama groups (D.R. Congo): A key for the evolution of the Mesoproterozoic...Dresden, Germany c Université officielle du Sud Kivu, Bukavu, Congo b A R T I C LE I N FO A B S T R A C T ...still under debate. Modern studies distinguish the north-eastern Karagwe-Angkole Belt (KAB) and the southern...distinction of the KAB and the poorly studied northwestern Kivu Belt (KVB) has to be suggested. Latest researches...and Bugarama groups. Both of them occur along the Congo, Rwanda and Burundi borders and have frequently |  | Prokopyev, Ilya R., Doroshkevich, Anna G., Sergeev, Sergey A., Ernst, Richard E., Ponomarev, Jean D., Redina, Anna A., Chebotarev, Dmitry A., Nikolenko, Anna M., Dultsev, Vladislav F., Moroz, Tatyana N., Minakov, Alexey V. (2019) Petrography, mineralogy and SIMS U-Pb geochronology of 1.9–1.8 Ga carbonatites and associated alkaline rocks of the Central-Aldan magnesiocarbonatite province (South Yakutia, Russia) Mineralogy and Petrology, 113 (3) 329-352 doi:10.1007/s00710-019-00661-3 | Journal (article/letter/editorial) | | aggregates with haematite, monazite-(Ce), xenotime-(Y), rutile-(Nb), barite-(Sr), anhydrite, ancylite-(Ce) and...zone extends approximately 400 km in length from north to south (Fig. 1). It is confined to the Hardagasky...gneisses host the Muostalaah occurrence. Most of the territory is covered by Quaternary sediments: pebble, sand...the Timpton river (Fig. 4), approximately 30 km north-east of Neryungri town in Yakutia. The ore-body...carbonatite intrusion is elongated from south to north-west and is in contact with the metamorphic rocks |  | | Journal (article/letter/editorial) | | (chromitemagnesiochromite), fluoroapatite, barite, titanite, rutile, baritocalcite, calcite, ilmenite, hydrozircon...have been compensated for by presence of baotite, rutile, titanite, barite, and hydro-zircons. The presence...(pseudoleucite), spinel, apatite, calcite, barite, titanite, rutile, allanite and baotite (Figs 5a-b and 6b-d). Minor...Commonly associated accessory phases are titanite, rutile, hydro-zircons, calcite, pyroxene, chlorite and...association with groundmass amphibole, titanite, rutile, calcite, baotite and hydro-zircon. Representative |  | | Journal (article/letter/editorial) | | Wolframite Ores from Democratic Republic of the Congo, Africa Alireza K. Somarin Department of Geology...various location in Democratic Republic of the Congo shows that cassiterite and wolframite ores from...the eastern portion of the Democratic Republic of Congo (DCR). With the advent of U.S. Securities and Exchange...deposits: A good example of this type deposit is Lueshe Nb deposit, in the northeast DRC (Figure 2). This...Catalao, Brazil; Tomtor, Russia; Lueshe, Democratic Republic of Congo Alkaline granite and syenite Nb |  | | Journal (article/letter/editorial) | | geographically separated areas, comprising the Shaba and Kivu provinces west of the Central African Rift and...In the west, the Kibara belt is limited by the Congo (Zaire) craton (although the border area is not...occurrences are known from Greenland, Scandinavia, India, Congo and Australia. Towards the later middle Proterozoic...of collision belts are the Grenvillean belts of North America and western South America, the Albany-Fraser...1986; Pinna et al., 1993:950-800 Ma). Towards the North, however, Mozambiquian collision is younging (in |  | | Report (issue) | | ~port- - - - -- - - - - - - - - Graph showing world mine production of niobium concentrate, for selected...larger, than was established when the decision to mine was made. Experts with a sound knowledge of a deposit...1970 1975 1980 1985 1990 • Year 2. World mine production of niobium concentrate, for selected...production is dominated by three producers that mine pyrochlore; the Araxa open pit in Minas Gerais,...state, also in Brazil, and the Niobec underground mine in Quebec Province, Canada. The Brazilian position |  | | Journal (article/letter/editorial) | | Mn-garnet (Mn), albite (Na, Al), orthoclase (K), rutile (Ti), zircon (Zr), LiNbO3 (Nb), fluorphlogopite...Zirconolite-group minerals, biotite, zircon, columbite, rutile, baddeleyite, ancylite-(Ce), burbankitegroup minerals...columbite, strontianite, ancylite-(Ce), and Nb-bearing rutile (“ilmenorutile”). The chemical compositions of...strontianite, (Mgt) magnetite, (Clb) columbite, (Ilrt) Nb-rutile (ilmenorutile), (Ap) hydroxyl-fluorapatite, (Po)...% Mineral, number of analyses, n Component, Nb rutile baddeleyite catapleiite zirconilite carbonates |  | Giovannini, Arthur L., Bastos Neto, Artur C., Porto, Claudio G., Pereira, Vitor P., Takehara, Lucy, Barbanson, Luc, Bastos, Pedro H.S. (2017) Mineralogy and geochemistry of laterites from the Morro dos Seis Lagos Nb (Ti, REE) deposit (Amazonas, Brazil) Ore Geology Reviews, 88. 461-480 doi:10.1016/j.oregeorev.2017.05.008 | Journal (article/letter/editorial) | | for the Mn. The main Nb ore mineral is Nb-rich rutile (with 11.26 – 22.23 wt.% Nb2O5), which occurs in...intense. Minor Nb-rich brookite formed from Nb-rich rutile occurs as broken spherules with an “oolitic” (or...(or Liesegang ring structure). Nbrich rutile and Nb-rich brookite incorporate Nb following the [Fe3+ +...deposit is located within the Balaio Indigenous Territory, within the Pico da Neblina National Park, and...detected by XRD in the fragmented laterite are Nb-rich rutile, Nb-rich brookite, florencite-(Ce), and rare ankerite |  | Deditius, Artur P., Smith, Frances N. (Skomurski), Utsunomiya, Satoshi, Ewing, Rodney C. (2015) Role of vein-phases in nanoscale sequestration of U, Nb, Ti, and Pb during the alteration of pyrochlore. Geochimica et Cosmochimica Acta, 150. 226-252 doi:10.1016/j.gca.2014.11.024 | Journal (article/letter/editorial) | | secondary phases from tailings of Silver Crater Mine in Bancroft, Ontario (Canada) have been studied...collected from a tailings pile at Silver Crater Mine in Bancroft, Ontario (Canada), where a carbonatite...1993). The U-Pb dating of uraninite from the Faraday Mine in the Bancroft indicated ages of 1059-1020 Ma (Little...et al., 1997), as well as sphene, monazite, and rutile (1074-1030 Ma; Mezger et al., 1993) in this area...alteration of metamict betafite from Silver Crater Mine was studied by Lumpkin and Ewing (1996), which identified |  | Guowu, Li, Guangming, Yang, Fude, Lu, Ming, Xiong, Xiangkun, Ge, Baoming, Pan, de Fourestier, Jeffrey (2016) Fluorcalciopyrochlore, A New Mineral Species From Bayan Obo, Inner Mongolia, P.R. China. The Canadian Mineralogist, 54 (5) 1285-1291 doi:10.3749/canmin.1500042 | Journal (article/letter/editorial) | | pyrite, fersmite, columbite-(Fe), monazite-(Ce), rutile, and others. Crystals mostly form as octahedra...sequence deposited in easttrending grabens along the north edge of the Archean crystalline Sino-Korean craton...pyrite, fersmite, columbite-(Fe), monazite-(Ce), and rutile. APPEARANCE AND PHYSICAL PROPERTIES While most...42 0.28–0.66 0.12 Y3Al5O12 6.31 5.47–7.95 0.71 Rutile 0.26 0.00–0.43 0.12 Uranium metal 61.36 57.71–65...Williams, CNMNC Chairman, for his help and advice, and Dr. Adam Pieczka for his advice. This study was supported |  | | Catalog/List | | 7. APATITE variety FRAN~JLITE. Fowey Consols Mine, Tywardreat~. Corny/all. A r i<.:h Cc:'ust of intergrown...the c£n~u) 2xlt". £27. AZURITE. Duke of Cornwall Mine, Kadina, S. Australia. Sele~t. pure, radiated nodules...matrix. 2xlixl-}". £7. BOF. ITE. South .;aradon Mine, st. '::leer, Cornwall. A pure, purply irridescent...Chalcopyrite. 2txlt". £1.65. BREli STERITE. 'Ihitesmith Mine, Str:mtian, Argyll. Choice, sharp, creamy coloured...app~oximately ~" in size. £7.75. CALCITE. Stank Mine, Furness, Lan~s. An intergrown group of large, sharp |
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