 | | 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) | | Petrology and geochemistry of the carbonatite and syenite complex of Lueshe (N.E. Zaire) H. v. MARAVIC& G...complex of Lueshe (N E. Zaire). Lithos 13, 159-170. Oslo. ISSN 0024-4937. The Lueshe carbonatite is intr~lded...show a weak fenitisafion at the contact to the carbonatite complex. Petrographical and chemical investigations...I vol. % are typical. The carbonat;,ies ot the Lueshe alkal;ne complex are mainly s6vites with some alvikites...135, D-IO00 Berlin 12. Tyskland. The carbonatite complex of Lueshe like those of Monbadio, Bingo, Kirumba |  | | Journal (article/letter/editorial) | | production of Nb, with the primary St. Honoré carbonatite and other sources accounting for only for 7 and...individual petrographically-defined units of carbonatite contain distinct suites of pyrochlore. Bulk rock...10 times or more above those of the primary carbonatite. Commonly, pyrochlores in laterites are fine grained...and 1%, respectively. Mining at the Catalão-I carbonatite was discontinued in 2001, although there is a...(Cordeiro et al., 2011). Many other occurrences of carbonatite are currently being evaluated [e.g. Aley and |  | 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) | | homepage: www.elsevier.com/locate/oregeorev Carbonatite-hosted niobium deposit at Aley, northern British...Available online xxxx Keywords: Aley niobium deposit Carbonatite Metasomatic rocks Pyrochlore-group minerals Columbite-group...Canada, is hosted by metamorphosed calcite and dolomite carbonatites of anorogenic affinity emplaced in...lesser extent, amphibole. When the passive margin of North America became the zone of plate convergence in...hydrothermal dolomite, quartz and chlorite. Progressive enrichment of the deformed dolomite carbonatites |  | | 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...Science B.V. All rights reserved. Keywords: Carbonatite; Hydrothermal alteration; Meteoric weathering;...weathering; Rare-earth elements; Republic of Congo 1. Introduction Among the chemical characteristics of carbonatites |  | Cordeiro, Pedro Filipe de Oliveira, Brod, José Affonso, Palmieri, Matheus, de Oliveira, Claudinei Gouveia, Barbosa, Elisa Soares Rocha, Santos, Roberto Ventura, Gaspar, José Carlos, Assis, Luis Carlos (2011) The Catalão I niobium deposit, central Brazil: Resources, geology and pyrochlore chemistry. Ore Geology Reviews, 41 (1) 112-121 doi:10.1016/j.oregeorev.2011.06.013 | Journal (article/letter/editorial) | | Available online 22 July 2011 Keywords: Catalão I Carbonatite Phoscorite Nelsonite Pyrochlore a b s t r a...a c t The Catalão I alkaline–carbonatite–phoscorite complex contains both fresh rock and residual (weatheringrelated)...plug-shaped orebodies named Mine II and East Area, respectively emplaced in carbonatite and phlogopitite. Together...apatite-rich (P2 unit) or magnetite-rich (P3 unit). Dolomite carbonatite (DC) is intimately related with nelsonite...the Catalão I niobium deposit is related to carbonatite magmatism but the process that generated such |  | 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) | | pyroxenite; its bearing on the composition of carbonatite magmas J. GITTINS, C. R. ALLEN & A. F. COOPER...clinopyroxenites and carbonatite dikes of the Cargill ultramafic rock-carbonatite complex near Kapuskasing...intrusion of carbonatite into pyroxenite and is further testimony to the fact that many carbonatite magmas...rocks and crystallize as calcitic and dolomitic carbonatite with alkali contents restricted to the amounts...of the carbonatite magma. Abundant evidence for considerable amounts of fluorine in carbonatite magmas |  | 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) | | Niobium and rare earth minerals from the Virulundo carbonatite, Namibe, Angola L. TORRÓ1, C. VILLANOVA1, M...Editor: Hilary Downes] ABSTRACT The Virulundo carbonatite in Angola is one of the largest in the world...mineral in all of the carbonatite units (calciocarbonatites, ferrocarbonatites, carbonatite breccias and trachytoids)...quartz-carbonate-fluorite vein formation in the carbonatite, has produced a third generation of pyrochlore...depleted in Ca and Na. K EY WORDS : Angola, carbonatite, pyrochlore, REE, magmatic, hydrothermal, weathering |  | 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) | | 2012 Available online 28 June 2012 Keywords: Carbonatite Pyrochlore Niobium Magmatic Hydrothermal Supergenic...distribution. From the host rock to the centre of the carbonatite intrusion, the succession of alteration types...fluorite or as veinlets in fluoritized/silicified carbonatite. Minerals associated with Sr-, Ba- and Pb-pyrochlores...2004). These minerals are found in nearly all carbonatite types and their chemical composition is widely...number of pyrochlore compositions within the same carbonatite. This diversity in composition is interpreted |  | | Journal (article/letter/editorial) | | alkaline silicate igneous rocks, forming alkaline-carbonatite complexes, but some occur as isolated pipes,...indicator mineral surveys Carbonatites and alkaline-carbonatite complexes are the main sources of rare earth... Nine per cent of carbonatites and alkaline-carbonatite complexes contain active or historic mines, making...Introduction Mineralised carbonatites and alkaline-carbonatite complexes are highly sought after, multi-commodity...targets for mining companies worldwide. Alkaline-carbonatite complexes are significant sources of Cu, apatite |  | | Journal (article/letter/editorial) | | MARCH 1982, VOL. 46, PP. 13-17 A discussion of carbonatite evolution and nomenclature, and the generation... Possible evolutionary paths of alkali-rich carbonatite magma may be related to the production of sodic...preferential loss of Na from a sodi-potassic carbonatite magma. Trends of both Fe and Mg enrichment in...on rock chemistry. TI~E possible evolution of carbonatite magmas from initial compositions rich in alkalis...stage, CaO--MgO---(FeO + Fe203 + MnO). However, carbonatite evolution does not pass through these stages |  | | Journal (article/letter/editorial) | | pyrochlore and monazite-(Ce) from apatite-dolomite carbonatite, LesnayaVaraka complex, Kola Peninsula,...Thunder Bay, Ontario, Canada P7B 5El Apatite-dolomite carbonatite at Lesnaya Varaka, Kola Peninsula, Russia...Lueshite is a primary Nb-bearing phase in the carbonatite and ranges in composition from cerian lueshite...pyrochlore due to late-stage re-equilibration in the carbonatite system. X-ray powder diffraction data for both...alteration of the primary mineral assemblage of the carbonatite. KEYWORDs:lueshite, pyrochlore, strontiopyrochlore |  | | Journal (article/letter/editorial) | | REE, and Y contents gradually increased. All carbonatite types are suggested to contain initial fluorcalciopyrochlore...fluorcalciopyrochlore. However, in calcite–dolomite and ankerite carbonatites, it is partially or completely...from melt inclusions in minerals from calcite carbonatite and ijolite (Panina and Podgornykh, 1975, 1979;...reactions and hydration during the evolution of carbonatite complexes. This reflects on the content and behavior...duringthe multistage formation of the Belaya Zima carbonatite complex. This provides insight into the role |  | Downes, Peter J., Dunkley, Daniel J., Fletcher, Ian R., McNaughton, Neal J., Rasmussen, Birger, Jaques, A. Lynton, Verrall, Michael, Sweetapple, Marcus T. (2016) Zirconolite, zircon and monazite-(Ce) U-Th-Pb age constraints on the emplacement, deformation and alteration history of the Cummins Range Carbonatite Complex, Halls Creek Orogen, Kimberley region, Western Australia. Mineralogy and Petrology, 110 (2) 199-222 doi:10.1007/s00710-015-0418-y | Journal (article/letter/editorial) | | and alteration history of the Cummins Range Carbonatite Complex, Halls Creek Orogen, Kimberley region...zirconolite in clinopyroxenite from the Cummins Range Carbonatite Complex, situated in the southern Halls Creek...alteration. Monazite-(Ce) in a strongly foliated dolomite carbonatite produced U-Th-Pb dates ranging from ~900–...Orogeny. The emplacement of the Cummins Range Carbonatite Complex probably resulted from the reactivation...between the emplacement of the Cummins Range Carbonatite Complex and mafic large igneous province magmatism |  | 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) | | Yakutia, Russia). Several apatite-dolomitic carbonatite occurrences were studied: Seligdar, Muostalaah...minerals are fluorapatite, magnetite, ilmenite, dolomite, K-feldspar, phlogopite and accessory zircon,...(Boyarko 1983). The alternative idea of a magmatic carbonatite origin for the Seligdar apatite ores was first...(1992) were inconsistent with their magmatic carbonatite hypothesis. The primary isotopic ratios of strontium...isotopic composition of carbon in the apatite-dolomite rocks of the Seligdar deposit are close to those |  | Rampilova, Maria, Doroshkevich, Anna, Viladkar, Shrinivas, Zubakova, Elizaveta (2021) Mineralogy of Dolomite Carbonatites of Sevathur Complex, Tamil Nadu, India. Minerals, 11 (4) 355 doi:10.3390/min11040355 | Journal (article/letter/editorial) | | minerals Article Mineralogy of Dolomite Carbonatites of Sevathur Complex, Tamil Nadu, India Maria Rampilova... A.; Viladkar, S.; Zubakova, E. Mineralogy of Dolomite Geological Institute, Siberian Branch of the...Research, Bhopal 462066, India; sviladkar@gmail.com Carbonatite Research Centre, Amba Dongar, Kadipani 390117...of the Sevathur carbonatite complex (Tamil Nadu, India) consists of dolomite carbonatite with a small number...number of ankerite carbonatite dikes. Calcite carbonatite occurs in a very minor amount as thin veins |  | | Journal (article/letter/editorial) | | latestage carbothermal veins at the Lueshe complex, Democratic Republic of Congo (Safiannikoff 1959). Lueshite...in a primary magmatic carbonatite association, e.g. apatite dolomite carbonatite at Lesnaya Varaka (Russia)...of crystallization of water-bearing, F-free carbonatite melts. Discussion Fig. 6. Phase relationships...confident that these data are applicable to real carbonatite magmas as the bulk compositions of our experimental...charges with 20–40 wt% NaNbO3 represent realistic carbonatite liquids with 3.8–7.6 wt% Na2O. NaNbO3, analogous |  | LEE, MI JUNG, LEE, JONG IK, GARCIA, DANIEL, MOUTTE, JAQUES, WILLIAMS, C. TERRY, WALL, FRANCES, KIM, YEADONG (2006) Pyrochlore chemistry from the Sokli phoscorite-carbonatite complex, Finland: Implications for the genesis of phoscorite and carbonatite association. GEOCHEMICAL JOURNAL, 40 (1) 1-13 doi:10.2343/geochemj.40.1 | Journal (article/letter/editorial) | | phoscorite-carbonatite complex, Finland: Implications for the genesis of phoscorite and carbonatite association...2, 2005) The phoscorite-carbonatite complex in the Sokli alkaline-carbonatite massif, northern Finland...phoscorites and calcite carbonatites; D4 and D5 for dolomite carbonatites). The phoscorites and calcite carbonatites...majority of rock types in the Sokli phoscorite-carbonatite complex, shows wide compositional variation and...phoscorite and calcite carbonatite and continues up to the latest D5 dolomite carbonatite. Pyrochlore in the |  | Cordeiro, Pedro F.O., Brod, José A., Dantas, Elton L., Barbosa, Elisa S.R. (2010) Mineral chemistry, isotope geochemistry and petrogenesis of niobium-rich rocks from the Catalão I carbonatite-phoscorite complex, Central Brazil. Lithos, 118 (3) 223-237 doi:10.1016/j.lithos.2010.04.007 | Journal (article/letter/editorial) | | petrogenesis of niobium-rich rocks from the Catalão I carbonatite-phoscorite complex, Central Brazil Pedro F.O...Nelsonite Carbonatite Catalão I Tetra-ferriphlogopite Apatite a b s t r a c t The Catalão I carbonatite complex...bebedourite–(pyroxenite)-series rocks at the border to carbonatite- and phoscorite-series rocks at the core. The...mineralization of the Catalão I Complex. Dolomite carbonatite (DC) occurs in association with both P2...late-stage phoscorite, forming paired phoscorite–carbonatite sets. Mica chemistry changes from phlogopite |  | | Report (issue) | | ~port- - - - -- - - - - - - - - Graph showing world mine production of niobium concentrate, for selected...m showing schematic cross section through a carbonatite complex - - - - - - - -- --- - Map showing location...source of niobium. These minerals are found in carbonatite, certain rocks in alkaline igneous complexes...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 |  | | Journal (article/letter/editorial) | | volcanic carbonatites. K EY WORDS : Angola, carbonatite, zonation in pyrochlore, fluorine, high field strength...mineralization is associated with the early stages of carbonatite activity and carbonatites are commonly rich in...or enrichment in Nb is a good criterion for carbonatite identification. Niobium is usually concentrated...concentrated in intermediate pulses of carbonatite activity (Kapustin, 1980). Pyrochlore-group mineral concentrates...from carbonatites. They are found in nearly all carbonatite types, at least in accessory amounts. Their chemical |  | | Book (edition) | | Dedicated to Harry von Eckermann, an eponym for carbonatite, with admiration and affection Preface to the...this edition, summarizes the major advances in carbonatite studies in the decade 1966-1976. Since 1966 many...Certainly one of the important new facets of carbonatite study will be their saprolite geology. Recognition...Kimberlites Carbonatites and Vulcanism Geology of Carbonatite Bodies Mineralogy and Petrology Composition and...both flows and pyroclastics. The emplacement of carbonatite bodies has been accompanied by exomorphic changes |  | | Journal (article/letter/editorial) | | Keywords: Pyrochlore Betafite Perovskite Kimberlite Carbonatite Venezuela a b s t r a c t Oscillatory-zoned...olivine, zoned spinel, phlogopite, carbonates (dolomite, calcite, magnesite), apatite, tetraferriphlogopite...Pcl–pyrochlore-group minerals; Srp–serpentine; Dol–dolomite; Phl–phlogopite; Mgt–zoned spinel; Ol–olivine;...and phlogopite in an aggregate of zoned spinel, dolomite, phlogopite–tetraferriphlogopite, calcite, magnesite...Mg)(Cr,Fe)2O4 → (Fe,Mg)2(Ti,Fe)O4 → (Fe,Mg) Fe2O4. Dolomite is the dominant carbonate in the groundmass, usually |  | | Journal (article/letter/editorial) | | 2012, Vol. 76(2), pp. 357–376 A mantle-derived dolomite silicocarbonatite from the southwest coast of...respectively) but REE depleted compared with volcanic dolomite carbonatites worldwide. The mineral assemblage...assemblage consists of Sr-rich (0.55 wt.% SrO) ferroan dolomite, magnesite and pseudomorphs of chlorite after...conditions between those in which primary dolomite carbonatite and ultramafic magmas of high-pressure origin...WORDS : Cahermore, carbon isotope, carbonatite, chlorite, dolomite, Ireland, mantle, magnesite, oxygen |
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