 | | Journal (article/letter/editorial) | | and geochemistry of the carbonatite and syenite complex of Lueshe (N.E. Zaire) H. v. MARAVIC& G. MORTEANI...and syenite complex of Lueshe (N E. Zaire). Lithos 13, 159-170. Oslo. ISSN 0024-4937. The Lueshe carbonatite...investigations show that the different types of syenite of the alke,line complex belong mainly to the miaskitic...I vol. % are typical. The carbonat;,ies ot the Lueshe alkal;ne complex are mainly s6vites with some alvikites...Berlin 12. Tyskland. The carbonatite complex of Lueshe like those of Monbadio, Bingo, Kirumba, Kibvy, |  | | Journal (article/letter/editorial) | | IN WEATHERED PYROCHLORE-GROUP MINERALS FROM THE LUESHE AND ARAXÁ (BARREIRO) CARBONATITES BY 57Fe MÖSSBAUER...Nb ore deposits in laterite: Lueshe in the Democratic Republic of Congo, and Araxá in Brazil. In contrast...oxidation state in the kalipyrochlore sample from Lueshe. Spectra of both samples are consistent with the...coordinated by 6 O2– is observed in both cases. In the Lueshe sample, it is also coordinated by 5 O2– and 1 OH–...gisements latéritiques à Nb, celui de Lueshe en République Démocratique du Congo et celui d’Araxá au Brésil, l’idée |  | | 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...from the niobium-bearing carbonatiteof Lueshe,Kivu, Belgian Congo. characterized by a markedimpoverishment...typesof carbonatites. The simple carbonatiteof Lueshe, Kivu occursin the graben area where severalnephe |  | | Report (issue) | | 519(1) c = 5.505(1) Z=8 X-ray Powder Pattern: Lueshe, Congo. 3.91 (100), 2.77 (69), 1.955 (43), 1.96 (34)...46] 100.00 Na2 O TiO2 3.62 12.23 18.91 (1) Lueshe, Congo; Fe2 O3 and TiO2 on a separate sample, SiO2... at the contact of cancrinite syenite with carbonatite (Lueshe, Congo); in sodalite xenoliths associated...associated with an intrusive alkalic gabbro-syenite complex (Mont Saint-Hilaire, Canada); a common accessory...(Ilı́maussaq intrusion, Greenland). Association: Mica (Lueshe, Congo); sodalite, ussingite, villiaumite, steenstrupine |  | | 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...riebeckite,and potashgranites b. intermediaterocks: syenite,syenoid c. ultrabasic rocks: pyroxenite, jacupirangite...StructureoI ColumbiumCarbonatites.-Lueshe: 1. core of busorite (canefinite syenite) 2. intermediatering of siSrite |  | | 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) | | 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...is interest in the evaluation of several A-type syenite/granitoid complexes for their Nb potential. These...only operating Nb mine in under-saturated peralkaline syenites is the Karnasurt mine (Kremenetsky et al...niobium–yttrium–fluorine-rich (NYF) peralkaline granite/syenite-hosted Nb deposits it is apparent that mineralogically |  | Mitchell, Roger H., Burns, Peter C., Knight, Kevin S., Howard, Christopher J., Chakhmouradian, Anton R. (2014) Observations on the crystal structures of lueshite. Physics and Chemistry of Minerals, 41 (6) 393-401 doi:10.1007/s00269-014-0657-1 | Journal (article/letter/editorial) | | perovskite-group mineral lueshite from the type locality (Lueshe, Kivu, DRC) and pure NaNbO3 demonstrate that lueshite...crystal structures of lueshite (2 samples) from Lueshe, Mont Saint-Hilaire (Quebec, Canada) and Sallanlatvi... Conventional neutron diffraction patterns for Lueshe lueshite recorded over the temperature range 11–1...Time-of-flight neutron diffraction patterns for Lueshe lueshite recorded from room temperature to 700...from the Lueshe carbonatite complex (Maravic et al. 1989), North Kivu (Democratic Republic of Congo) by Safianikoff |  | | Journal (article/letter/editorial) | | Uganda-Kenya border, and a western one along the Uganda-Congo border associated with the Western Rift system.... Three carbonatites from the eastern, north-south trending belt were sampled: Sukulu Hill, Tororo Hill...ijoliteurtite-melteigite series, nepheline syenite, fenitized syenite and quartz syenite, and finally fenitized granite...one of the satellite ring-dikes is not specified. North of these older, deepIy eroded complexes there is...1958). From west to east the complexes are Rangwa, North and South Ruri, Homa Hountain, Buru Hill and the |  | | Journal (article/letter/editorial) | | intrusions of the rift border and lavas from Southern Kivu, Southern and Western Virunga. The intrusions have...lavas, sub-alkaline basalts, appear in Southern Kivu at the Eocene. They are followed by alkaline basalts...Miocene, and then at the lower Pleistocene. To the north, some earlier volcanic remains of alkaline sodic...alcalines situ6es en bordure du rift et des laves du Sud-Kivu, du sud et de l'ouest des Virunga. Les intrusions... des basaltes sub-alcalins, apparaissent au Sud-Kivu ~t l'Eoe~ne. Elles sent suivies par des basaltes |  | | Journal (article/letter/editorial) | | been found and analysed in carbonatites from the Lueshe, Newania, Kangankunde, and Chipman Lake complexes...siderite. Material analysed and results Lueshe, Zaire. Lueshe is a complex of carbonarites, including...dolomitic and calcitic varieties, and cancrinite syenite, situated at the northern end of the western branch...carbonates from Lueshe, Newanla, Kangankunde and Chipman Lake c a r b o n a t i t e s Lueshe ..............no. 10) gave an analysis of a carbonatite from Lueshe described as "Rauhaugite a 90% de magnesite"; unfortunately |  | | Journal (article/letter/editorial) | | meteoric alterations of the Lueshe carbonatite complex žDemocratic Republic of Congo / identified by a REE...whole-rock samples of the Lueshe carbonatite complex ŽNE of Democratic Republic of Congo.. The fresh and hydrothermally...fluorhydric-nitric solution ŽHF q HNO 3 .. The Lueshe carbonatite complex contains a suite of REE-carriers...Meteoric weathering; Rare-earth elements; Republic of Congo 1. Introduction Among the chemical characteristics...large quantities of Fig. 1. Geological map of the Lueshe complex Žmodified after Maravic et al., 1989.. |  | | Journal (article/letter/editorial) | | rock type Brevik, Norway; nephelinesyenite Lueshe, Lake Kivu, Zaire; carbonatite Hybla, Ontario, Canada;...Panda Hill, Mbeya, Tanzania; carbonatite Woodcox mine, Hybla, Ontario; granitic pegmatite MacDonaldmine...Leushe, Lake Kivu, Zaire; carbonatite Fredricksvarn,NoMay; nepheline syenite Lueshe, Lake Kivu, Zaire; carbonatite...carbonatite Lueshe, Lake Kive, Zaire; carbonatite Jacupiranga,Sao Paulo, Brazil; carbonatite Araxe, Minas...to that observed in sample l8l from a nepheline syenite host rock in the Langesundfiorddistrict of southern |  | | Book (edition) | | nepheline-syenite bodies which occur at some localities as inclusions in the limestone”’ (italics mine). Actually...‘‘fine-grained but crystalline,” (5) that they were 1] thank Dr. G. R. Udas for bringing this historic description...entstanden sind.” The notion that the parent nepheline syenite magma had been enriched through limestone syntexis...gneisses, and invaded as elsewhere by nepheline-syenite” (Fig. 1-2). This was the initial (1934) identification...carbonatite dikes cutting the kimberlite of the Premier mine (p. 542) he classed as magmatic, but 1 Bowen admitted |  | 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) | | lesser extent, amphibole. When the passive margin of North America became the zone of plate convergence in...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...20% Nb2O5 cutoff Foreland belt (rifted margin of North America) ~370 Ma Dolomite carbonatites (calcite...Disputed between Société Lueshe, Rutshuru Dist., North Kivu, Democratic Minière du Kivu (Somikivu) and Krall |  | | Journal (article/letter/editorial) | | carbonatites at Argor, Carillon Dam, Chilwa Island, Fen, Lueshe, Oka, Mbeya, Meech Lake and Verity. Primary features...e veinlets and low A-ion totals (Carillon Dam, Lueshe, Myeba). K EY WORDS : zoned crystals, carbonatites...to Ce4+ in some pyrochlore from laterite (e.g. Lueshe and Mbeya of this paper; see below) it is not possible...pyrochlore pyrochlore,uranpyrochlore Mineral Lueshe, Dem. Rep. of Congo San Vicente, Cape Verde Is. Kovdor,...7), ceriopyrochlore (Lueshe specimen BM 1966/232 – rim) and kalipyrochlore (Lueshe specimen BM 1966/232 |  | 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) | | set of faults oriented NE–SW that cut the Angola–Congo craton (Issa Filho et al., 1991). Different types...intrusions of troctolite gabbro, ijolite, nepheline syenite, syenite and carbonatites, along with gabbro and porphyrytic...suggested by the concentric ring shape of the syenite intrusions. Carbonatites consist mainly of calciocarbonatites...systems, such as in a weathering profile in Lueshe, Congo (Wall et al., 1996). Oliveira et al. (2007,...studies in Barcelona were supported by an AECI grant. Dr. Xavier Llovet helped during EPMA analyses at the |  | | Journal (article/letter/editorial) | | 8 , * ~ 0 . 2 , w = 0 and 0 . 2 < n < l ) from Lueshe, Zaire is a defect pyrochlore species whose A-site... powder pattern I. INTRODUCTION The Lueshe cancrinite syenite/carbonatite complex is located in the...pyrochlore subgroup, from the residual soils of the Lueshe carbonatite deposit. The calculated density is...London show that the kalipyrochlore from the Lueshe deposit (Kivu, Zaire) has a formula lying between the |  | ROSA, M, CONCEICAO, H, MACAMBIRA, M, GALARZA, M, CUNHA, M, MENEZES, R, MARINHO, M, FILHO, B, RIOS, D (2007) Neoproterozoic anorogenic magmatism in the Southern Bahia Alkaline Province of NE Brazil: U–Pb and Pb–Pb ages of the blue sodalite syenites. Lithos, 97 (1) 88-97 doi:10.1016/j.lithos.2006.12.011 | Journal (article/letter/editorial) | | online 19 December 2006 Abstract Blue sodalite syenite is a rare rock, and the Southern Bahia Alkaline...dykes or pegmatitic masses hosted by nepheline syenite. Economically viable quantities for the production...ages are similar to those found for the nepheline syenite host bodies, which supports the conclusions of...of sodalite are in sharp contact with nepheline syenite pegmatite, and its crystal aggregates often contain...sodalite; Syenite; Neoproterozoic; Anorogenic magmatism; Brazil 1. Introduction Blue sodalite syenite are |  | | Journal (article/letter/editorial) | | carbonatites elsewhere in Africa (e.g. Lueshe, Democratic Republic of the Congo), the Buru carbonatite centre...weathered crusts. It also has been reported from the Lueshe carbonatite complex, where it was observed to be...and encouragement given by Prof. A.E. Fallick and Dr A. Boyce at the Scottish Universities Research and...cancrinite -syenite/ carbonatite complex of 672 LANTHANIDE MINERALIZATION, BURU CARBONATITE Lueshe, Kivu/NE |  | | 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 |  | | Report (issue) | | ....................................... 2 World Mine Production .......................................Information Services Ltd., 2012). World Mine Production In 2011, world mine production of tantalum increased...total mine production in 2011; Brazil accounted for 20 percent; the Democratic Republic of the Congo [Congo...together accounted for 47 percent of the world’s mine production of tantalum. The locations of significant...southwestern Western Australia. The Greenbushes Mine, which is hosted by the Archean Greenbushes pegmatite |  | | Journal (article/letter/editorial) | | t h e East African Rift system, the 1966) a n d Lueshe (a.o. Maravic a n d Morteani, carbonatic bodies...alkalic complexes emplaced a n d 110 k m to the north-west), on t h e other side of between t h e n o...are k n o w n on b o t h t h e Rift. sides of Lake Kivu. The existence of t h e Kibuye Several types of...the n e i g h b o u r h o o d of Kibuye a n d lake Kivu by B. Egoroff d u r i n g the '50s a n d they have...c a m b r i a n formations (see The Kawizi body (Kivu) h a s b e e n described a n d below) t h r o u |  | Walter, B.F., Parsapoor, A., Braunger, S., Marks, M.A.W., Wenzel, T., Martin, M., Markl, G. (2018) Pyrochlore as a monitor for magmatic and hydrothermal processes in carbonatites from the Kaiserstuhl volcanic complex (SW Germany) Chemical Geology, 498. 1-16 doi:10.1016/j.chemgeo.2018.08.008 | Journal (article/letter/editorial) | | Upper Fir in Canada, Tomtor in Russia, Lueshe in Dem. Rep. Congo) or re-evaluation (e.g., Panda Hill in...associated with medium- to coarse-grained nosean syenite (only in the NU Badberg area; see Braunger et...underlying coarse-grained carbonatite with nosean syenite (Fig. 2A, electronic supplement MA ES4). The...coarse-grained calcite-carbonatite underlain by nosean syenite (Figs. 2A & B), interrupted by CE phonolitic...judge if these are related to fenitized nosean syenite xenoliths. At Orberg and Katharinenberg however |  | | 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...is related to a Cambrian syenite-carbonatite intrusion with a core of syenite (~800 m in diameter), which |
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