 | | 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 |  | | 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 |  | 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...British Columbia, Canada, is hosted by metamorphosed calcite and dolomite carbonatites of anorogenic affinity...lesser extent, amphibole. When the passive margin of North America became the zone of plate convergence in...in heavy C and O isotopes relative to primary calcite, coupled with changes in the trace-element composition |  | | 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 |  | 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 |  | 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...unit) or magnetite-rich (P3 unit). Dolomite carbonatite (DC) is intimately related with nelsonite. Natropyrochlore...the Catalão I niobium deposit is related to carbonatite magmatism but the process that generated such |  | 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) | | differences between various coarse-grained calcite-carbonatite bodies (Badberg, Degenmatt, Haselschacher...Nb2O5 is common in all coarse-grained PT calcite-carbonatite bodies and probably formed during magmatic...Upper Fir in Canada, Tomtor in Russia, Lueshe in Dem. Rep. Congo) or re-evaluation (e.g., Panda Hill in...opportunity to study the geochemical evolution of a carbonatite system in detail. MA Previous studies indicate...variations within and between the different carbonatite bodies of the complex (Blust, 1993; Katz and |  | | Journal (article/letter/editorial) | | (1959) from the Lueshe carbonatite complex (North Kivu, Democratic Republic of the Congo). Safianikoff...Experimental The sample of lueshite from the Lueshe calcite carbonatite investigated consisted of a 1 g finely...indicated that small (<100 microns) crystals of calcite were present in some, but not all, crystals. Analysis...number of extremely weak peaks, attributed to calcite microinclusions reflecting the provenance of the...lueshite sample from the type locality, the Lueshe carbonatite, reveals reflections due to the presence |  | | 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) | | VARIATION OF PYROCHLORE-GROUP MINERALS AT THE OKA CARBONATITE COMPLEX, QUEBEC: EVIDENCE OF MAGMA MIXING? SHANNON...common accessory constituents of calcite carbonatite at the Oka Carbonatite Complex, Quebec. This complex...province, and consists predominantly of calcite carbonatite and feldspathoidal silicate rocks. Mineralogical...textural features, indicate that the Oka calcite carbonatite has an extremely complex evolutionary history...magmas, enriched in Nb, Ti, LREE, U, and Th. The calcite carbonatites of the NIOCAN and Bond Zone areas |  | | Journal (article/letter/editorial) | | morphology, and zoning. During evolution from early calcite to late ankerite carbonatites, the UO2, TiO2, REE...All carbonatite types are suggested to contain initial fluorcalciopyrochlore. However, in calcite–dolomite...determined from melt inclusions in minerals from calcite carbonatite and ijolite (Panina and Podgornykh, 1975...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 |  | | 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) | | 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 |  | 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...Monazite-(Ce) in a strongly foliated dolomite carbonatite produced U-Th-Pb dates ranging from ~900– 590...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 |  | 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 |  | | Journal (article/letter/editorial) | | pyrochlore and bariopyrochlore in late calcite carbonatites. Early calcite carbonatites also contain uran pyrochlore...Saint Honoré (Canada) and Lueshe (Zaire – now Democratic Republic of Congo) supply about 90% of world...fractionation of rare elements, in alkaline and carbonatite magmas (Williams and Ko garko, 1996; Chakhmouradian...al., 2004). But, pyrochlore mineralization in carbonatite rocks associated with other rock types, in particular...Samples and Analytical Methods Rocks of the carbonatite series at the Khibina mas sif are represented |  | | Journal (article/letter/editorial) | | Keywords: Pyrochlore Betafite Perovskite Kimberlite Carbonatite Venezuela a b s t r a c t Oscillatory-zoned...zoned spinel, phlogopite, carbonates (dolomite, calcite, magnesite), apatite, tetraferriphlogopite, Fe–Ni–Cu-sulfides...crystals of the pyrochlore-group mineral. Cal–calcite, other abbreviations see Fig. 2. Numbered points...spinel, dolomite, phlogopite–tetraferriphlogopite, calcite, magnesite, pyrochlore, Fe–Ni–Cu-sulfides and apatite...groundmass, usually contains rounded grains of calcite in the central parts. Both carbonates are rich |  | Wall, F., Niku-Paavola, V. N., Storey, C., Muller, A., Jeffries, T. (2008) XENOTIME-(Y) FROM CARBONATITE DYKES AT LOFDAL, NAMIBIA: UNUSUALLY LOW LREE:HREE RATIO IN CARBONATITE, AND THE FIRST DATING OF XENOTIME OVERGROWTHS ON ZIRCON. The Canadian Mineralogist, 46 (4) 861-877 doi:10.3749/canmin.46.4.861 | Journal (article/letter/editorial) | | XENOTIME-(Y) FROM CARBONATITE DYKES AT LOFDAL, NAMIBIA: UNUSUALLY LOW LREE:HREE RATIO IN CARBONATITE, AND THE...very rare in carbonatite. Uniquely, at Lofdal, Namibia, xenotime-(Y) occurs in many carbonatite dykes. It...replaces zircon in calcite carbonatite and also occurs as aggregates in ankerite carbonatite, aggregates associated...and synchysite-(Ce) in highly oxidized iron-rich calcite carbonatites. The paragenetic sequence places the...directly related to the crystallization of the carbonatite and provides a date consistent with published |  | | 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...1. 2. Carbonatite-sourced secondary deposits: A good example of this type deposit is Lueshe Nb deposit...This deposit is related to a Cambrian syenite-carbonatite intrusion with a core of syenite (~800 m in diameter) |  | Broom-Fendley, Sam, Brady, Aoife E., Horstwood, Matthew S.A., Woolley, Alan R., Mtegha, James, Wall, Frances, Dawes, Will, Gunn, Gus (2017) Geology, geochemistry and geochronology of the Songwe Hill carbonatite, Malawi. Journal of African Earth Sciences, 134. 10-23 doi:10.1016/j.jafrearsci.2017.05.020 | Journal (article/letter/editorial) | | geochemistry and geochronology of the Songwe Hill carbonatite, Malawi Article in Journal of African Earth Sciences...are also working on these related projects: Carbonatite and alkaline volcanism in Italy and elsewhere...geochemistry and geochronology of the Songwe Hill carbonatite, Malawi Sam Broom-Fendley a, *, Aoife E. Brady...through three different carbonatite compositions (C1eC3). Early C1 carbonatite is scarce and is composed...composed of mediumecoarse-grained calcite carbonatite containing zircons with a UePb age of 132.9 ± 6.7 Ma |  | | Journal (article/letter/editorial) | | carbonatites with a mineral assemblage of ankerite-calcite or siderite are widespread in southern Siberia...melts. Ankeritecalcite carbonatites formed from carbonatite melt at a temperature of more than 790 °C. The...The ferrocarbonatites (the second phase of carbonatite intrusion) formed from a sulfate-carbonate-chloride...mineralization in polymict siderite breccia. Keywords Carbonatite . Ferrocarbonatite . Siberia . Tuva region ....Novosibirsk, Russia Introduction Carbonatite complexes are often represented by calcite-, dolomite-, or ankerite-rich |  | Benaouda, Rachid, Kraemer, Dennis, Sitnikova, Maria, Goldmann, Simon, Freitag, Ralf, Bouali, Abdelhafid, Mouttaqi, Abdellah, El Haloui, Rachid, Essaadaoui, Mustapha, Bau, Michael (2020) Thorium-poor monazite and columbite-(Fe) mineralization in the Gleibat Lafhouda carbonatite and its associated iron-oxide-apatite deposit of the Ouled Dlim Massif, South Morocco. Gondwana Research, 77. 19-39 doi:10.1016/j.gr.2019.06.011 | Journal (article/letter/editorial) | | columbite-(Fe) mineralization in the Gleibat Lafhouda carbonatite and its associated iron-oxide-apatite deposit...columbite-(Fe) mineralization in the Gleibat Lafhouda carbonatite and its associated iron-oxide-apatite deposit...columbite-(Fe) mineralization in the Gleibat Lafhouda carbonatite and its associated iron-oxide-apatite deposit...South Morocco revealed the occurrence of several carbonatite bodies, including the Paleoproterozoic Gleibat...rocks occur locally at the ro margins of the carbonatite outcrop and were identified as glimmerite fenite |
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